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Author Topic:   Over-powered 13 SPORT
DANO posted 08-01-2006 09:40 PM ET (US)   Profile for DANO   Send Email to DANO  
gentleman, pirates,racers and the like, I seek your knowledge.

specs:.' 74 13' 4" sport.originally powered by ' 74 50 rude. (mean so and so)17" p for skiing, 21" for playing. have NO idea on speed as I was 14 at the time. many ripped out batts, flying steel fuel tanks, and several EXTREMELY CLOSE encounters of the verticle horizon kind and I have come full circle in completely restoring her. aft 1/3 deck cut out, new oak stringers glassed in, new 2 part polyurethane foam poured in,( it was just a LITTLE damp ;) ) 7 layers of 1/8" bendable poplar plywood with a layer of glass and cloth between each one, ALL wood replaced with starboard due to the 8 month season on the ches. bay and the requisite new years day blast around the great wicomico. I am waiting on the boats return from Line-X, who sprayed the deck white to make it all one texture over the deck patch. ( I can here you purists giving me the bronx cheer but I hate the wood upkeep. I would rather go faster, longer, Sal, would you agree? ) I have moved the rear seat back 8 inches because I still like to sit on the deck with my right leg under the console while u/w and that will get my 165lb. can back to where it would be if I were sitting on the seat. battery has been upgraded ( ? ) to an AGM type to keep the weight down and moved to port side aft corner. 12 gallon Tempo gas tank under rear seat approx. 24" forward of splashwell. danforth 5S anchor in chocks starboard side aft corner. this boat will be motivated by a new still in the box ( 05 ) merc 60 classic carb. 3 cyl. 2 st. ( 219 lbs. ) 1.64 'case. rotech planetary steering, teleflex tach, trim gage, housed in custom made box on console, 3 soke s.s./foam wheel, fuse panel, battery switch, running lights, compass. based on this info, I am thinking of the 17"P turbo prop, and motor mounting starting with cav plate 1.5" above keel. I'll probably due some slolom skiing so a spare 13 should suffice? Obviously I am looking for as much speed as I can find. Do I really need to start thinking in the field of jack plates and or trim tabs?. I am am hoping to see an honest 50 mph when I'm done. I have a ton of pics as this has been a 9 month project so far. I will post for those of you who would like to paruse but wanted to see if I was "running down the right channel".

thanks in advance for your for help. and I look forward to conversing with all of you.

Dano.

The Judge posted 08-01-2006 10:10 PM ET (US)     Profile for The Judge  Send Email to The Judge     
Why?

Want to go fast.but=y a 13' Checkamte and drop a 60 on it and do 60+

DANO posted 08-01-2006 10:16 PM ET (US)     Profile for DANO  Send Email to DANO     
WHY?. BECAUSE I'VE HAD THE BOAT SINCE I WAS 12 . AND I THOUGHT THIS WAS A "WHALER" SITE???????
an86carrera posted 08-01-2006 11:07 PM ET (US)     Profile for an86carrera  Send Email to an86carrera     
Good Luck with this project.

I think I would remove the hook in the rear of the hull and I'm not so sure about keeping those twin skegs either the're too fat and start too abruptly.

However, no liability expressed or implied here for your safety or the functionality of the boat after these mods.

These are just my thoughts of what I might try with a already molested hull. Mine is not, which is why i'm selling the 13' and bought a 15' in my quest for more speed from a whaler that I use just for fishing inshore and exploring the back bays of my area.

For reference I have a 1967 13' sport with a 50 evinrude turning a 21" prop, max speed I've seen is 42mph GPS.

I'm sure you will get more ideas and greater wisdom for your endeavor from some of the experts here.

Again, Good Luck
Len

Whaler_bob posted 08-02-2006 10:42 AM ET (US)     Profile for Whaler_bob    
You said you haven't run her with the Merc 60hp yet, correct?
With the mods (moving the rear seat back, placing a 12 gal gas tank under it, 200lb+ engine and battery, a new anchor in the aft section) and the extensive glass repairs you've made- the CG (center of gravity) and overall weight distribution may be way off normal.
I'd rig it out then run her, eventually stepping up to full throttle (if conditions permit) and see how fast she goes and how she behaves- before doing any below the waterline hull mods.
Sounds like a lot of weight in the stern, she may porpose. You may have to relocate the gas tank forward or go with a 3 or 6 gal version. Some people have reported that the addition of a DOL-FIN type device on the engine helps overall stability?

The hull for the 13' was designed in the 1950's, high speed back then was 30mph. Pushing the 13' Whaler hull to 50mph may just be inherently unstable no matter how many mods you make.

I'd like to see some pics when you can post em. Sounds like a fun project.
Good luck and calm seas.

pglein posted 08-02-2006 10:44 AM ET (US)     Profile for pglein  Send Email to pglein     
Wait, you cut out the floor and glassed in stringers? Wood ones no less?

Man, that's not a Whaler any more.

The Judge posted 08-02-2006 02:27 PM ET (US)     Profile for The Judge  Send Email to The Judge     
My point exactly. If an old 50(40hp at today's standards) trashed the hull, what makes you think a 60hp will not just shatter it? The 13' hull is NOT the whaler hull to make go fast, the 15' is. That hull was designed to run with a 25hp and still pull a skier. Putting a 60 or even a 90 on it is like pissing in the wind. Without a pad on the stern, she will never break free and run like a performance hull will. There is a rule of thumb in any performance community but with oats it goes like this:

All hulls have a theoretical top speed. Lets say with a 13' it is 40mph with a 50hp. Now a 25hp will push her 30mph. You just doubled the hp to gain 10mph or 33%. You will need to double it again to get another 10mph. So theoretically you wll need 100hp to fetch 50mph. You can only push a barge so fast and a 13' my friend is a barge.

Still don't agree? Well a 19' Whaler with a 115 will run 40mph. I dropped a 175 on her and got 50mph. So 50% more hp fetched me 25% more speed. ant to get her to 60, gonna need about 300hp. This is better than the 13' comparison because the 19' has a modified V-hull. That 13 is a BRAGE!

Still don't agree.go to www.screamandfly.com and ask there.

The Judge posted 08-02-2006 02:30 PM ET (US)     Profile for The Judge  Send Email to The Judge     
Oops.BARGE! not BRAGE!

:)

Sorry I sounded snotty in my first post but if you want to go real fast, get a go-fast boat. Dropping a $5k engine on a 13' to make her go fast is like putting a BBC in a stock Vega.

BOB KEMMLER JR posted 08-02-2006 02:36 PM ET (US)     Profile for BOB KEMMLER JR    
Nick V8 vegas were fun back when leisure suits were the rage lol I agree,no Whaler hull is meant to be a high speed hull.My 40 nissan on my fathers 13 can get you in trouble if you try to trim it to the moon.It feels like the transom is trying to dig in and flip the boat over.I'm not saying don't tinker with your 13,just be careful and have realistic goals.
The Judge posted 08-02-2006 02:38 PM ET (US)     Profile for The Judge  Send Email to The Judge     
V8 vegas are great if set up correctly. Dropping one in a stock car is gonna twist that frame after the 3rd wheelstand.been there with a 402CI in a 1985 RX-7.
PeteB88 posted 08-02-2006 03:58 PM ET (US)     Profile for PeteB88  Send Email to PeteB88     
My former almost brother-in-law saw some dudes trying to run a 14 foot Mirrocraft fishing boat with a Corvair engine near Detroit some years ago. They made a hole in the bottom of the boat for the prop shaft but couldn't figure out how to keep the water from coming in. I guess it went like hell for awhile and they just barely got it back to shore before it sunk.
DANO posted 08-02-2006 05:32 PM ET (US)     Profile for DANO  Send Email to DANO     

DANO posted 08-02-2006 05:46 PM ET (US)     Profile for DANO  Send Email to DANO     
I had to glass the oak stringers in. that was the only option I had. the foam was shot and you most obviously can't just add some new piece of deck without support and expect it to be even close to right.as far as the 60 shattering the hull. I think it could be stated that I (as well as most of you )are not QUITE as crazy as we were as a teen. and I've seen it written in these messages many times. " you don't have to use all the power all the time" but when conditions permit. let's agree. it is a rush. the motor was had for a song .the hull I've had for years, the fiberglass reconstruction was a labor of love, the project as a whole has been an educational experience that I have enjoyed. I set a goal,developed a plan,embarked on this mission and found this site apparently too late. oh well. I'm still going to get the project finished, make it a hair raising ride from $%*&, and turn some heads as well. and I hope in the end, Mr. Fisher will look down and grin and say.at least it's still on the water.
BOB KEMMLER JR posted 08-02-2006 09:58 PM ET (US)     Profile for BOB KEMMLER JR    
Dano-I'm curious why you didn't just re-foam the areas and glass over them like Whaler did?Post some pics of your boat when you get a chace,especially with the 60 mounted on it.
DANO posted 08-02-2006 11:16 PM ET (US)     Profile for DANO  Send Email to DANO     
I felt I had to make stringers and cross stringers due to the 2 part foam install. There was no way I I could get the foam to shape correctly and have good adhesion to the hull AND the new deck. I figured I would have to shape the foam too much with that application. This way, I could build my stringers and glass them in place while the wetted out fabric in the inner hull was just starting to kick off. then after a week of curing, we laid on 3 sheets of plywood with a layer of glass between each.( one layer each weekend )then cut fill hole in each "cell", poured in the foam, let it cure then back to 4 more layers of plywood. believe me... the cutting and shaping of the stringer system was the most grueling task but I figured this was the best way to try and remake the "composite" nature of the original hull.... I will post some picks when I get it back from my Line-X man... thanks for the inquiry...
BOB KEMMLER JR posted 08-02-2006 11:25 PM ET (US)     Profile for BOB KEMMLER JR    
Sounds like you put some sweat into it for sure.I forget that the bonding process isn't as easy as just spraying some foam onto the glass and then glassing over.So i see your point.With all that work,i'm surprised you didn't glass a pad on the bottom similar to a small voodoo or other 12-13 foot go fast hull.I'm really interested to see it now.
DANO posted 08-03-2006 04:58 PM ET (US)     Profile for DANO  Send Email to DANO     
BOB, you're right ....surely some sweat equity has been invested...and with my learning curve as advanced as it has become with this project, don't be surprised if I don't do something as bizzare as that. At least I'll wait and get a years use out of her and work out what bugs may arrive....
pglein posted 08-04-2006 06:45 PM ET (US)     Profile for pglein  Send Email to pglein     
Well, I'm curious to see the boat. I guess glassing in stringers is the best structural solution when you're faced with a hull with a large foam void in it. At that point, I'd just give up on it and find a different hull. But I guess at some point in time, these things won't be as plentiful as they are right now. All the more reason to take good care of them today.


When you say "pad" what do you mean by that? Please explain, I'm not an expert on hydrodynamics.

I do, however, know a little bit about hull speed. Only displacement hulls suffer from hull speed. A planing hull doesn't suffer from the speed limiting factors that displacement hulls do. The only limitig factor would be it's terminal velocity, or the limit of how it can be pushed through the air. This is likely to be very high, and not relevand to the discussion. The reason a 13' with a 40 only goes marginally faster than a 30 is because of weight and propping. I assure you, a 13' Whaler can be made to go 50mph. And it wouldn't take 100hp. It probably wouldn't even take 60. A 13' hull could probably be made to go 100mph, but at that point it'd be more of a plane than a boat, and would require airfoils like a hydroplane to keep it stable.

pglein posted 08-04-2006 06:46 PM ET (US)     Profile for pglein  Send Email to pglein     
Man, that's a lot of typos. Too many to even try to correct. Just use your noggin and you can probably figure out what I meant to say. Sorry.
BOB KEMMLER JR posted 08-04-2006 10:15 PM ET (US)     Profile for BOB KEMMLER JR    
pglein-You should check out the Scream and Fly forum.You'd be surprised how much you can learn just lurking over there and using the search function.A pad is basically a flat spot where the V of the hull meet together,usually runs a few feet to half the boats length from the transom forward.At high speeds the boat will actually fly on the pad,making it much easier to control and making it possible for much higher speeds.Some boats don't "get on the pad" until 65-75 mph though lol All depends on the design.
It would be a serious modification to do to a Whaler and could take SEVERAL tries before the ride style of pad is found that works.I can see how the sponsons could catch a wave though and make things very scary knocking the boat off that pad.
Boatplans posted 08-05-2006 06:21 PM ET (US)     Profile for Boatplans  Send Email to Boatplans     
Dano,

Personally, I very much enjoy seeing a fellow boater go to the trouble of fixing up an old boat, especially a reminant of one's youth. You might have problems. Mistakes may be made. Whatever you do, don't give up until the boat is satisfactory. Perhaps it will take a couple of iterations to make the boat run correctly and at the performance levels desired. If you continue until success, you will have more knowledge than all the doubting Thomases combined together. Hopefully, you will continue to share what you learn with this forum. I strongly agree with the project even though I would take a different approach. You may be smarter than I am and I hope you are because I want to learn. Keep us posted.

John

DANO posted 08-12-2006 09:04 PM ET (US)     Profile for DANO  Send Email to DANO     
FOLKS,
I trust you have all had a nice few days while I was away...not boring you with the daily grind stories????. pleasure before business..... I should get my baby back from the line-x man by wed. or thurs. Can't wait to hang the motor and rig her out... when I get my new camera to P.C. link right, I'll send some pics. Anyway, I wanted to ask you speed freaks out there if 1 1/2" above hull bottom is a good starting point for cav. plate height? I ordered a Turbo hotshot 10 1/2 x 16p prop. I'm also considering the addition of 9" x9" trim pads to help if the porpoising gets out of hand.... thoughts as well as barbs are welcomed....
an86carrera posted 08-12-2006 11:41 PM ET (US)     Profile for an86carrera  Send Email to an86carrera     
Nick,
What your saying is that Pareto is correct. 80-20
Len
DANO posted 08-13-2006 10:02 AM ET (US)     Profile for DANO  Send Email to DANO     
Len, I have no idea what that last post was all about. Unless you're getting others to chime in? Perhaps you are posting on the wrong thread.

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