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  115 Merc on Montauk trial run

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Author Topic:   115 Merc on Montauk trial run
PSW posted 11-17-2002 12:26 AM ET (US)   Profile for PSW   Send Email to PSW  
1991 Montauk with 1991 115 Mercury both in pristine condition. Great run and performs like a top. Swinging a 21 pitch aluminum at 5300 rpm. Dont have GPS yet for accurate reading but fishfinder hit 50. I know that is tough with Montauk, so we will see? What is the best recommended prop for this boat motor combo. Last montauk had ballistic on J/E GT 100. I want to be able to ski and get top end performance. Any suggestions and or modifications/ alterations for motor that would be beneficial. Also any service I should be doing.

Thanks,
PSW

lhg posted 11-18-2002 06:22 PM ET (US)     Profile for lhg    
A 21" aluminum prop on your engine shows 47 top speed. I would guess that you want either a Merc High Five for the ultimate in water skiing, or Laser II if top speed is your issue. Can't have both, but the Laser also gives good acceleration and pulling power, particularly if the vents are opened.

If engine is raised 1 1/2", a 22" pitch will probably work, but for only a light load. If not, go with the 20" pitch. You will not lose any speed with the 20 compared to the 21 aluminum. I would think 20" pitch would be best all around.

Bigshot posted 11-19-2002 01:33 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Ditto a 20" laser 2 would be the woo. Those props have nice holeshots and great top end.
PSW posted 11-19-2002 05:38 PM ET (US)     Profile for PSW  Send Email to PSW     
Thanks guy's for your input. I have heard the laser is pretty fast. What do you think of the Michigan "Rapture." Since the aluminum 21" flexes a bit I want to be sure to get a SS that is either 19" or 20." I want to be sure to pull atleast 5250 rpm. As usual I think you boys are right on the money. I will stop by the prop shop and try to test a 20" laser over the next few weeks.

Thanks

PSW

lhg posted 11-19-2002 07:17 PM ET (US)     Profile for lhg    
I've never had any luck getting a Mercury dealer to let me try out an expensive prop. Good luck on that effort, though.

The Mercury Laser was the first of the "tame" performance props, introduced about 1986. Prior performance props were the cleavers and chopper props, without exhaust hub, and were barely useable on pleasure boats. The Laser changed all of that. As with almost all of Mercury's props the Laser II (a slight refinement 2 years later) has been widely copied, including the OMC Raker, a Yamaha version (don't know name) and the Stiletto, Turbo's, etc. Michigan wheel just recently brought out their own version, the Rapture. So I would think any of those would work for you. But none have Mercury's patented adjustable vent system. Another advantage of the newer Mercury props is they can be used on any brand of engine. Only the $40 hub assembly needs to be changed. This makes them much easier to sell, trade, or use on a different engine brand at any time.

Mercurymarine.com has a lot of information on propeller applications, and you can order their propellor catalog on line. They are expensive, but are the highest grade propellers you can buy.

Bigshot posted 11-20-2002 10:06 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Larry i have had merc props rehubbed to fit other engines. $40-50.
lhg posted 11-20-2002 04:12 PM ET (US)     Profile for lhg    
Nick - Have you seen the newer props, brought out about 3 years ago? The hub, for whichever brand engine you need, is simply a plastic and bronze sleeve affair, with thrust washer, that drops in and out of the prop, and comes separately packaged in a little box. There is no rubber hub any longer, only the plastic sleeve which accomodates the shear function. So you can't "spin" a hub any longer, only shear the plastic hub, which is easily replaced without going to a prop shop. Mercury has recently licensed Michigan Wheel to offer the system also.
PSW posted 11-20-2002 05:25 PM ET (US)     Profile for PSW  Send Email to PSW     
Ihg that is why I brought up the rapture. Last summer we put one on brother-law Optimax and all we needed was this little quicksilver hub kit that was like 5 bucks. I was under the impression that the rapture is very close in performance to the laser, as it is almost a knock-off of it. If this is not so then I will jus pay what I need to for the performance.

Thanks for the help,

PSW

kenh posted 11-27-2002 06:53 PM ET (US)     Profile for kenh  Send Email to kenh     
I had a 1992 100 h/p merc 2 stroke on my 1992 montauk.It was equipped with a 4 blade stainless 20' prop.The whaler performed excellant with top speed 49.6 [gps].I have just replaced it with a 2001 evinrude 4 stroke.am going to test it out next week
PSW posted 11-28-2002 01:20 AM ET (US)     Profile for PSW  Send Email to PSW     
Went to prop shop today and am testing out 3 different SS props on Sunday. I will be testing a 4 blade turbo prop, 19 rapture, and 22 laser II. I know the laser sounds high in pitch, but the owner told me it is very efficient and should be a screamer. We will se which one wins out. Maybe bring in a 4th prop, 20 Laser II. we will report back after Turkey day with findings.
lhg posted 11-28-2002 05:16 PM ET (US)     Profile for lhg    
Besides speed and RPM's, be sure to notice how much higher and smoother the boat runs with the lift from the Laser II prop. I'm still betting on 20" pitch, but the 22 will at least show you how this series performs.
Running fully submerged, it is unlikely it will turn much more than 4600 rpm. My second choice would be the 21" Rapture, although it does not have the variable vent capability. I think they are not vented at all. Be sure your trim tab will clear these high rake props. You may need the flat plate anode instead.
PSW posted 11-28-2002 11:16 PM ET (US)     Profile for PSW  Send Email to PSW     
The boat does not have tabs and seems as though the motor is mounted quite high compared to my last Montauk and most that I have seen. Have not measured cavitation plate yet though. I do suspect the Laser II will be the prop of choice, but we will just have to see. Thanks for all the input everyone.

What are thoughts on specific height and mounting standards. Motor currently is just bolted and doesn't have even a mounting plate on it. Interested to know what is best height because I may be remounting. Not sure about jack plate since weight moving even farther back would further hurt static trim?

PSW

Montauk72 posted 12-03-2002 07:26 PM ET (US)     Profile for Montauk72  Send Email to Montauk72     
I'm swinging a 21" aluminum with a slight cup--110 '86' Johnson. Shes turning 5100 and reading 48MPH on the GPS....
Bigshot posted 12-04-2002 11:51 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Montauk....a 19" SST would be better.
PSW posted 12-04-2002 06:53 PM ET (US)     Profile for PSW  Send Email to PSW     
I am still testing various props and have not decided on one yet. I can't beleive how great the prop shop owner has been. Yesterday tested a odd ball SS prop and 21 Rapture. Going to test a 21 Turbo three blade before weekend. That will be the 6th prop. Mid 48's seems to be the fastest I have seen with two people in the boat on GPS. Currently Cavitation plate is 1/2 inch obve bottom of hull. Do you think overall performance would be any better if I raised it one hole (1"). I have gotten mixed reviews on the idea. Thanks for the ongoing input everyone.

PSW

jimh posted 12-08-2002 10:54 AM ET (US)     Profile for jimh  Send Email to jimh     
Jump to this thread for more results of the propeller tests:

http://continuouswave.com/ubb/Forum4/HTML/001251.html

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