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Author Topic:   Dauntless 16: Trim Tabs, Propeller
Tiz7070 posted 02-07-2014 10:53 AM ET (US)   Profile for Tiz7070   Send Email to Tiz7070  
Has anyone placed [Bennett] trim tabs on the [Boston Whaler DAUNTLESS 16]?

[What propeller is the best propeller] for overall performance with a 1999 Mercury two-stroke-power-cycle [outboard engine of unspecified horsepower which was later described as a 90-HP]?

[Is the best propeller the] Stiletto Bay Pro 15p? Or, the Bay Pro 18p? Or the Mercury Trophy Plus 17p?

How many holes-up should [the outboard engine] be mounted to gain maximum performance with stainless steel propellers?

Jefecinco posted 02-07-2014 06:34 PM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
I believe Lenco electric trim tabs would be possible on a 16 Dauntless transom. Bennett hydraulic trim tabs would be a nightmare to install given the space available under the engine well.

If your engine is 90 HP or lower trim tabs could be very helpful for low speed operation and reduce the time [needed to accelerate to plane from a standing start].

What HP is your engine? My 1999 16 Dauntless with a 115 HP two-stroke engine was mounted three-holes-up and the propeller was a 14 3/4 X 15 four blade Stiletto Bay I. I did not have trim tabs and didn't need them with a 115 HP engine set up as described.

Butch

Tiz7070 posted 02-07-2014 10:56 PM ET (US)     Profile for Tiz7070  Send Email to Tiz7070     
Butch, Thanks for your reply. Unfortunately it is a 90 Mercury. I will eventually replace it with Yamaha F115. Which is another reason for considering proceeding with tabs. Anyway, yes nightmare I understand--minimal access and space. I wasn't sure if anyone tried this considering the planning of the Dauntless 16'. As far as the propeller, [your are] running a 15 pitch; that must really plane in a hurry with the 115. Wasn't sure if the Trophy plus is worth the extra [cost]. Did Mercury ever admit to the leaking oil cap on their 90 or 115? [Did Mercury explain] how to repair or fix [the leak]? Thanks,

Matt

Jefecinco posted 02-08-2014 10:10 AM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
Matt,

Yes the performance with the four blade propeller was extraordinary. The boat literally jumped on plane from idle if given full throttle. Of course, installing a propeller for good hole shot and low planning speed performance was done while knowing it would cost two or so MPH of top speed. It was worth it to me as I seldom ran the engine at top speed except to occasionally burn the carbon off the spark plugs. My propeller choice and mounting height adjustment was based on advice from Tom Clark and it was a perfect solution to my boat use. Tom also sold me a propeller for a very good price. He will undoubtedly provide provide some help if he sees your thread.

Unfortunately, I have no idea what a good propeller choice would be for a 90 HP Mercury. I suspect you will achieve decent or even good performance from your 90 HP Mercury using electric trim tabs, an optimum engine height adjustment and the right propeller.

The best propeller choice and engine mounting height question for your boat/engine combination has been asked before on this forum and excellent answers can be found using the site search engine.

Butch

Tom W Clark posted 02-09-2014 01:27 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
A Mercury 90 two stoke with its 5500 RPM redline and 2.33:1 gear ratio would make good use of a 13-1/4" x 15" Stiletto Bay Pro or 13-13/4" x 17" Trophy Plus.

The 14" x 15" Stiletto Star would work well too.

All of these are good stern lifting propellers that would negate the need for trim tabs.

Be sure the motor is mounted three holes up on the transom, i.e. the mounting bolts go through the motor mounting bracket thus:

o
o
o
o <-- Bolts Through This Hole
o

Lupi posted 02-10-2014 06:08 AM ET (US)     Profile for Lupi  Send Email to Lupi     
I have the same boat with the same engine.

Tom gave me very good advices when I went to replace my prop. See the thread below for all the discussion. My prop is a Stiletto advantage 1 13-1/4*17. Engine three holes up as per Tom recommendation. Very good holeshot even with 5 people. Idle speed @ 3500 rpm and top speed @ 5500 (redline) with a consistent 40 mph

http://continuouswave.com/ubb/Forum4/HTML/007763.html

Tiz7070 posted 02-13-2014 03:14 PM ET (US)     Profile for Tiz7070  Send Email to Tiz7070     
Okay; [I am] a little confused. I've tried finding this 13-1/4 x 15 Stiletto Bay Pro. The only four-bladed propellers by Stiletto I have found are all pitched with even numbers, like 16, 18, 20, etc. Where can I locate a 15p Bay Pro? Also, does the PVS of the TROPHYplus truly give an advantage? And, what plug would be used for best overall performance?
jimh posted 02-13-2014 04:31 PM ET (US)     Profile for jimh  Send Email to jimh     
There is at least one person who thinks the performance of a boat using a Mercury TROPHYplus propeller can be improved with PVS vents. See

http://continuouswave.com/ubb/Forum4/HTML/007845.html

The above thread is a long one, but there is quite a bit of reporting of first hand experience in the use of PVS vent plugs on particular boats, and also quite a bit of opinion given on the likelihood that one can obtain a significant improvement in performance by their use.

There is no opinion given in the linked thread (or anywhere else that I can find) on the notion that there is one PVS vent plug that works the best, other than, perhaps, the inference that the best PVS vent plug is the one that is solid, that is, has no holes.

Tom W Clark posted 02-13-2014 04:41 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
The confusion is understandable. The Bay Prop I 4.25 changed a few years ago from odd to even pitches. The larger tube 4.75 Bay Pro was always even pitches. So you may find a 13-1/4" x 15" Bay Prop on the used market but if new, it will need to be a 13-1/4" x 16"

Tom W Clark posted 02-13-2014 04:46 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
The beauty of the Mercury PVS vent system is that you can experiment to your heart's content at little or no cost.

Notes on the PVS system:

- You can mix match any of the sizes with one another, in any order.

- You can drill out solid plugs until you decide you've found the perfect size and leave it at that or go buy the factory made vents plug with that size hole.

- To remove a PVS vent plug, do not try to pry it out, rather, slather some dish soap over it and PUSH it into the hub where it will then fall out. This preserves the plugs for reuse. Prying them out destroys them and often scratches the propeller.

Floridaman posted 04-28-2014 09:37 PM ET (US)     Profile for Floridaman  Send Email to Floridaman     
I put Lenco trim tabs on my Dauntless 16' last year and it wad a huge improvement. I highly recommend them.
Marlin posted 05-05-2014 11:34 AM ET (US)     Profile for Marlin  Send Email to Marlin     
On my 160 Dauntless, the 17" Trophy Plus was an excellent choice. However, I have the Mercury 115 4-stroke, so I'm not sure how applicable my experience is for you.

See details at http://continuouswave.com/ubb/Forum4/HTML/004868.html .

-Bob

giowhaler posted 10-15-2014 05:56 AM ET (US)     Profile for giowhaler  Send Email to giowhaler     
This is great information.

I have a 2000 VENTURA (DAUNTLESS hull) with the notched transom notch and a Mercury 90-HP FOURSTROKE. [The boat has] sluggish acceleration from a standing start and the full-throttle [boat speed] is only 34-MPH, or so. [I do not have data on] engine speed at WOT. The target [engine speed at full throttle] is around 5.500-RPM. My engine is too low, and, from what I gather from Tom's posts on various topics, I should have the engine raised to the second highest position. Right now it is one up from the lowest so I will raise the engine two holes. [What] propeller type [is best] for my setup once I raise the engine? Right now I have a Solas TITAN 4 model 1453-130-19. It is stainless steel four [blade] 13-inch-diameter 19-pitch, This seems too high pitch based on what others have said. And based on my boat's performance even with engine too low it seems too high pitch. Tom recommended a propeller on this forum based on a 90-HP two-cycle. I have a four-cycle engine, which I think has less torque at lower [engine speed]. What propeller would you recommend on my setup? Thanks again for all your help.

jimh posted 10-15-2014 08:50 AM ET (US)     Profile for jimh  Send Email to jimh     
The most important observation in propeller testing is the engine speed at full throttle. You should re-test your current propeller and note the engine speed at full throttle when the boat is trimmed for best speed. Without some data on engine speed at full throttle, it is difficult to assess the propeller pitch.
giowhaler posted 10-15-2014 11:58 AM ET (US)     Profile for giowhaler  Send Email to giowhaler     
Forgot to mention the length. I have a 16 ft ventura(dauntless hull)
giowhaler posted 10-15-2014 12:00 PM ET (US)     Profile for giowhaler  Send Email to giowhaler     
Thanks JimH... I will do that next time in the water. Will take a week or so before I get back out.
RLSmith posted 10-15-2014 06:51 PM ET (US)     Profile for RLSmith  Send Email to RLSmith     
I didn't see the original post in Feb 2014 even though I usually am on the lookout for Dauntless topics. I bought my 2000 Dauntless 16 in 2002. It has Bennett M80 trim tabs. The hydraulic reservoir/pump unit is installed in the bilge area on the transom centerline. Accessibility through the splashwell hatch is not ideal but good enough.

My Suzuki DT115S two-stroke has plenty of acceleration and top speed for my purposes, including lots of towing watersports.

I use the trim tabs frequently: in chop, in swells, and when towing inexperienced tubers/wakeboarders when I want to plane at a lower speed.

If I were installing trim tabs on a new boat this small I would certainly consider Lenco.

giowhaler posted 10-26-2014 01:59 PM ET (US)     Profile for giowhaler  Send Email to giowhaler     
Quick update... I did not do a WOT test run, instead I ended up raising the engine yesterday, two holes up from my previous position listed earlier in the thread. So now I am at the second highest setting. So will not get it in the water for a few days while the sealant cures. I also want to test my WOT with a more appropriate propeller than what I have. My buddies have some props I can borrow. I want to use one that is most optimal on paper so any adjustment I need to make will be minor and should be more accurate.

quick question, with the engine raised now, should I just focus on stainless steel props or are there good aluminum props as well that will work with the raised engine height? I was thinking a 4 blade around 15 pitch. My buddies props are mainly aluminum. I think I can get a 15 or 17 pitch to test with. Other option is to stick with my 19 pitch solas titan 4 blade SS, but I already know that prop is too high of a pitch so that is why I am inclined to try and test with what on paper seems to be a better prop. Any thoughts? thanks.

giowhaler posted 10-28-2014 01:27 AM ET (US)     Profile for giowhaler  Send Email to giowhaler     
I found another prop to test WOT with. I can obviously use my solas titan 4 blade stainless which is a 13" diameter and 19" pitch. Or I can use a Michigan 3 blade aluminum 13-3/4" diameter and 15" pitch. Model number 031041. Plan to do test this weekend. weather forecast looks windy so finding flat water may be hard. Any recs on which prop to do WOT test so I can narrow in on the best prop for my setup. I also already raised the engine so this is the last piece of the puzzle... hopefully :-) thanks.
giowhaler posted 11-02-2014 10:18 PM ET (US)     Profile for giowhaler  Send Email to giowhaler     
I did the WOT test today with the Michigan 3 blade aluminum 13-3/4" diameter and 15" pitch. Model number 031041. it was like a new boat. WOT was 6000 or even 6100 RPM and 34mph fully trimmed with the boat lightly loaded with 2 adults. Hole shot was awesome. 3-4 seconds and then on plane. No more bow high ride. It just jumps on plane. so happy. I then called my wife and kids and buddies and went out again with 4 adults and 3 children. This is the heaviest load I would have on the boat. Still awesome hole shot, 1 second more and WOT was 5500 RPM and 31 mph. So heavier load definitely brought down RPM’s.

The weather was windy so the bay was choppy so not the best conditions to run the test. I just went leeward of a shallow reef/sandbar and did the test. I am sure the top end would be a bit better without all the chop. I am sure with a higher pitch blade I could make the boat fly but I am more interested in keeping the hole shot fast, especially if we tow people. I almost wish I kept my solas blade on to see the difference with the engine raised, but I introduced two new variables (Raised engine and different blade) to this test . Thanks so much for your advice. I am now going to return the se sport 400 hydrofoil I never opened. I don’t need it. It is like having a new boat. I may just keep the old used aluminum prop I used unless someone can recommend a better SS option or even an aluminum version. Whatever you recommend I am more interested in keeping the hole shot good and keeping on plane as low as I can go. In my test today I can keep the boat on plane at around 18 mph and even below that it is comfortable.

The only bummer was I noticed one of my scupper valves was leaking from the inside. I am tempted to just glass over the holes and route deck water to bilge, but will give the stainless steel . The Attwood 665533 looks pretty nice. I may give them a try. The heavy dauntless scuppers sit right at the waterline when empty. When loaded they are under water. Anyone have any advice a nice scupper valve. Back to the original topic, thanks again and let me know if you have any prop recommendations.
Thanks again!

Jefecinco posted 11-03-2014 09:01 AM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
You don't want to glass over the scuppers. You will be amazed if you're caught out in a heavy rain how quickly your bilge fills. When it happened to me my bilge pump was running constantly and almost keeping up. I had a light load, was underway and the scuppers were above water.

The 16 hull with more than two aboard will sink the scuppers unless the extra weight is forward of the console or consoles in the case of the Ventura.

Ping pong ball valves are available. I never used them but have heard they help.

You should be seeing much more speed at WOT with a light load. Be patient and retest in proper test conditions. Any conclusions you reach based on your most recent test are pretty much valueless.

I expect you will need to buy a proper stainless steel four blade propeller for OPTIMUM performance with your boat. Good acceleration onto plane and decent top end and economy are achievable with your boat but as your boat is 25 HP underpowered you won't be able to enjoy top performance. Four adults, three children, fuel and equipment is a huge load for your 16 with a 90 HP four stroke engine. That's a huge load for any 16 foot boat. Don't expect much with even the perfect propeller.

Butch

giowhaler posted 11-03-2014 09:56 AM ET (US)     Profile for giowhaler  Send Email to giowhaler     
thanks Butch... forgot to mention I also had over 25-30 gallons of fuel on board as well for both tests. That was part of my lightly loaded :-) I also figured a good SS 4 blade would be the call. a 4 blade SS, something between a 15 and 16 pitch. From what I understand SS of the same design will run slightly higher RPM than aluminum but that would be countered by the larger surface area of the 4 blade vs my 3 blade. The water is rarely flat where I live. May be months before I get truly glassy water. my test was done in 1-2" chop behind the reef and will be the some of the smoothest conditions I normally ride. Usually a bit choppier in the rest of the bay. thanks, George
giowhaler posted 11-03-2014 04:45 PM ET (US)     Profile for giowhaler  Send Email to giowhaler     
Other thatching I forgot to mention is that I have thick bottom coat on my hull. Two coats probably over the years. Kind of rough texture.
Jefecinco posted 11-03-2014 06:41 PM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
Two coats of bottom paint is not unusual and I've read a rough bottom surface can even enhance performance in some conditions.

Looks as though you're headed in the right direction. Good luck getting your 16 dialed in.

Butch

giowhaler posted 11-04-2014 04:22 AM ET (US)     Profile for giowhaler  Send Email to giowhaler     
Thanks Butch.. Do Tom or others have any stainless steel propeller [recommendations]? I have been checking out the Stiletto Bay Pro 16-pitch model that Tom recommended. Seems like it may do the trick. I am assuming the four-blade will give me the acceleration to get on plane that I am looking for. No rush since I at least have a propeller that feels good. Then again, my previous setup was so bad, anything would be better :-)
Jefecinco posted 11-04-2014 09:10 AM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
In my experience when Tom recommends a propeller you won't be able to do any better than that.

I think you'll find his recommended propeller will provide excellent acceleration to plane as well as good low speed planing capability and good WOT speed. It should also provide good performance when pulling skiers or water toys.

Butch

giowhaler posted 11-04-2014 11:03 AM ET (US)     Profile for giowhaler  Send Email to giowhaler     
Agree. Tom has been spot on in the engine mounting. That alone made all the difference. The propeller [recommendation] Tom made was for Lupi's setup which is almost identical to mine except that my 90-HP is a four-cycle engine instead of a two-cycle. So max rpm is 6000 and gear ratio is 2.07. I think the two-cycle engine of Lupi had different specs. So just wanted to confirm before I [make a decision] on a propeller. Thanks.
jimh posted 11-04-2014 11:56 AM ET (US)     Profile for jimh  Send Email to jimh     
If you want to make comparisons of propellers when used on a particular boat but with different engines, it is better to compare the propeller shaft speed rather than the engine crankshaft speed. The engine speed comparison is only valid if the two engines happen to have the same gear reduction in their gear case. In the case of four-cycle-power-stroke engines compared to two-cycle, there is a general trend for the four-cycle engines to employ a higher (numerical) gear reduction ratio compared to two-cycle engines of the same horsepower.
giowhaler posted 11-09-2014 09:13 PM ET (US)     Profile for giowhaler  Send Email to giowhaler     
hi there... well wind was low today so did another WOT test. This time with family and bimini top on. I gained 1 mph more than last test. 6100 RPM, around 35 mph and 15 pitch aluminum 3 blade prop. Boat is still performing well. When WOT, the cavitation plate is above water and things look great. At lower speeds it squats a bit more of course and you get a little spray. At lower speeds the engine could go higher not a doubt, I just worry about WOT if I raised it all the way to the highest setting making it hard to trim since it may just pull the prop out too much. I am one hole (3/4") from the highest setting. Anyone have experience raising a similar engine all the way to the top. I am happy where it is at so I am not inclined to do so, but was curious if anyone else had any experience with this and if it increased overall performance even more. thanks.
giowhaler posted 11-09-2014 09:59 PM ET (US)     Profile for giowhaler  Send Email to giowhaler     
Forgot to mention that I am still going to try a 4 blade prop before I do anything. I still have not re-propped yet. probably 4 blade 15 pitch. that should get me just under WOT upper range since I am a little over right now. Hopefully I do not drop too much.
Tom W Clark posted 11-14-2014 01:16 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
That Mercury 90 Hp FourStroke has a 2.33:1 gear ratio and a 6000 RPM redline.

The Ventura 160 should be good for almost 40 HPH wit that motor so if you are only getting 35 MPH I suspect there is more performance to be had.

I would try a good stainless steel propeller. I'd start with a 13-1/4" x 15" Stiletto Advantage (and a Flo-Torq III hub kit) which will yield far less calculated propeller slip than an aluminum prop.

If the motor is mounted "three holes up", like this:

o
o
o
o <-- Mounting Bolts Through These Holes
o

...I'd leave the motor where it is.

giowhaler posted 11-15-2014 01:37 PM ET (US)     Profile for giowhaler  Send Email to giowhaler     
Thanks Tom. That is exactly where the engine is mounted. Your recommendation to other users on this issue was perfect and I did the same. Made all the difference. Quick question, is there a 4 blade prop you would recommend that would allow planing at lower rpm and increase hole shot even more? Or is the 3 blade advantage good enough? I am not too concerned with maxing out upper end speed, just want to keep acceleration strong. Thanks again for sharing your knowledge with others.
giowhaler posted 11-26-2014 11:36 PM ET (US)     Profile for giowhaler  Send Email to giowhaler     
Hi Tom.. quick question, as I was looking for the stiletto advantage I ran into a powertech model that I may be able to get a good deal on, a powertech prop eld15. I save about $50. because of holidays have to wait until next week for shipping estimate. It is a 3 blade stainless steel 13-3/4" x 15p. It is basically the same dimensions as my current aluminum prop that is running around 6100 RPM at WOT. I know all props are different and dimensions and pitch alone don't tell the whole story. Anyone have any experience with these props and is it a worthy replacement for the advantage? I value your opinion so wanted to run it by you before I make a decision. thanks and hope everyone has a great thanksgiving and is grateful that we are able to boat and enjoy the water.

Wanted to also mention that my engine manual says I have a 2.07 gear ratio and not a 2.33. Does that change the prop recommendation? thanks again.

giowhaler posted 01-13-2015 01:21 AM ET (US)     Profile for giowhaler  Send Email to giowhaler     
ok, update on prop selection. I thought people may be interested in the direction I took this. First, I still do intend to try the stiletto because I do think Tom's call on my general setup has been spot on. I did want to try a 4 blade so I ended up with a powertech scd4 in a 14 pitch. That was not the first powertech I tried though. They first recommended the SWW4 in a 13 pitch which I had a bad feeling about. I tried the SWW4 and as beautiful as it looks, it is a real beast to turn with a what appears to be aggressive cupping. I could tell within 2-3 seconds that this prop would not work. I could only turn 5600 RPM fully trimmed and with just me, no bimini top and 5 gallons in a 44 gallon tank. This is a load I will never really ride since my normal load is about half tank and at least 2 adults and usually 3-4. It felt like it was glued to the water. Hole shot was nice and the whole boat seemed to just rise out of the water at WOT. AV plate was dry as a desert. Two big problems with this prop for my setup... I would need a 12 pitch just to make RPM's and steering torque was terrible. I could feel the engine struggling to turn this prop. My slip numbers were either negative or 0. I would have developed tendonitis had I kept using it. this prop was never meant to be on a small dauntless even with the 115hp let alone my 90hp. I immediately called powertech and explained the situation and decided that the SCD4 would be a better call. They have great customer service btw and really want to help you dial in the prop. I just wish I could have avoided the shipping costs back and forth. They almost recommended the RXB4 but decided on the scd4 and man, what a difference. They recommended the 14 pitch and it has been great for me.

I probably could have used the 15p but I ended up hitting 5900-6000 RPM with the 14p and a normal load of 3 adults and down to 5600 RPM with 4 adults, full tank and two kids. With just me and my wife with 3/4 tank I actually go over redline of 6000 RPM which is not a big deal to me. The 15 pitch would probably work in almost all conditions for me, but I like the holeshot and the overall ride of this pitch and I felt it wasn't worth the cost of exchange fee and shipping costs. Also, with summer ahead, RPM's may go down a bit and I will be towing people on tubes and stuff so holeshot is important. My slip numbers normal load are about 8% WOT, and 14% at mid range cruise of 3900 RPM. Slip numbers go up when heavily loaded. I think it was 11% WOT and 17% mid range cruise.

Here is what I like about the prop... zero vibration, no real shift clunk, smooth acceleration, and almost zero steering torque. Just smooth easy steering at all speeds and trim. Even my wife commented on how it just felt better. My setup likes this low rake, small diameter prop especially when heavily loaded. What I don't like is that when lightly loaded I am missing out on some of my top end speed and I have to watch the tach so I don't over rev the engine. Top speed was about 34 mph. I also think that I could be getting better slip numbers and better mileage from another prop but I really don't go out on long trips so I don't mind being a little inefficient on gas mileage in exchange for what feels like a great prop.

Other thing I noticed is that when most of the load is in the bow, I cannot trim the boat too much without inducing porpoising. Basically when on plane, neutral trim is fine and boat rides great. I am sure if I try different load setups this would change. I don't think this prop has any real bow lift (i.e. it cannot hold the bow up without slipping). I guess low rake props do this.

I know some may thing I am crazy but I think I will still get a stiletto 15p for the 25% of the time I am below my normal load and see how it does. I would love to try the bay pro in a 14p just because I heard the 4 blades don't vibrate as much but I am excited to try the three blade and see how it does. Plus, I would be using it when I am not towing anyone and just heading out with another person to fish, surf or dive.

So that was it... not too much technical data, but thought you would be interested. I will definitely post my experience with the stiletto when I get one. Or with any other prop for that matter. thanks.

giowhaler posted 01-16-2015 05:28 PM ET (US)     Profile for giowhaler  Send Email to giowhaler     
Hi there... Does anyone know where to get a stiletto advantage prop? I cannot seem to find a place that has them in stock. I just need the prop since I already ordered the flo torq 3 hub. Tom, do you still sell them? Even the turbo1 is hard to find. Anyone selling a used one? Or would I need to get the powertech red3 as an equivalent replacement? Thanks.
giowhaler posted 01-16-2015 08:17 PM ET (US)     Profile for giowhaler  Send Email to giowhaler     
Ignore my last post... I just found one on eBay. I will order it tomorrow. If someone has one then still let me know. Thanks.
giowhaler posted 02-09-2015 03:19 AM ET (US)     Profile for giowhaler  Send Email to giowhaler     
Ok, so here is the update as promised. I ended up getting the turbo 1 which is basically the stiletto advantage from what I understand. Finding a stiletto advantage prop proved to be harder than I thought so I went with Turbo. I ordered the 15p turbo and it comes ported. I also got the flo torq III as Tom recommended with this setup. I went out today in pretty good conditions. Light winds. 15-20 gallons of gas and Bimini top up and minimal equipment. As Tom indicated, I was able to hit 40.5 mph in the areas with really flat water and actually hit 41 with slight tail wind. Average WOT was around 39 I would say and around 5600-5700 RPM. With a 2.07 gear ratio that puts me at a slight negative slip. Pretty much zero slip at WOT. At cruising speed of 22-23mph I am at around 3500 and slip is around 6. The highest I could get the RPM’s was 5700-5800 and engine trimmed pretty high. Maybe if I had the bimini down it may have went up to 5800. I am not sure how the bimini impacts RPM’s.
Hole shot was also solid. About 3-4 seconds to cruise speed. Plenty good for me. I think I will save a lot of gas with this prop. No shift clunk or vibrations whatsoever. Very smooth and easy steering and was not able to get the prop to ventilate even at highest trim. Grips really well. Prop seems to give total boat lift and AV plate was bone dry at WOT. Definitely more total boat lift than the scd4. AV plate seemed to be above the water level by around half an inch. Just a guess. No real porpoising either with the load I had.
Tom was spot on with his recommendation of a prop. This will be my light to average load prop I think. When I am heavily loaded or tubing with the kids, I will still use the 4 blade scd4. I am very happy with the prop combo for my boat. Will satisfy every use I have. Before getting it I thought I would only use this prop around 25% of the time, but I think I will end up splitting the time 50/50 with the other prop. Thanks again for the recommendation.
Tom W Clark posted 02-09-2015 04:32 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
I'm glad the 13-1/4" x 15" Turbo 1 is working well for you. The Turbo 1, and its sibling, the Stiletto Advantage, is a great propeller.

The difficulty finding a 13-1/4" x 15" Stiletto Advantage is because the factory has had them on backorder for months. They are expecting to complete a production run of the 15" pitch Advantage 4.25s some time in March.

Until then, the Turbo 1 can be bought, though for more money, through a Yamaha or Turbo dealer.

Since 2011, all Turbo propellers have Yamaha part numbers and are distributed through the Yamaha Outboard distribution network.

Stiletto branded propellers continue to be drop shipped from the factory in Indianapolis.

The Yamaha Performance Series 3-Blade model is also the same propeller except that it is offered in even pitches instead of odd pitches and has the old style press-in rubber hub.

tmalvesti posted 04-04-2015 08:30 AM ET (US)     Profile for tmalvesti  Send Email to tmalvesti     
I am going to purchase a new propeller for my 2000 Dauntless 16 with a 2000 Yamaha F100. Would the 13-1/4" x 15" Stiletto Bay Pro work well with this boat and engine combination?

My Dauntless has the notch in the stern. I have a family of four and am not too concerned about speed as I'd rather have a smooth ride while cruising.

Thoughts?

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