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Author Topic:   Best prop for 13
L A posted 08-14-2001 01:07 PM ET (US)   Profile for L A   Send Email to L A  
I am currently running a 40 Mariner on my 13 with a stainless quicksilver 14 pitch prop. Engine is mounted up on the last hole. A friend just bought a 2002 gls 13 and he is running a 15 prop. On the Michigan wheel site their selector indicates a 15 for my setup, does anyone think 1 15 would sacrifice too much bottom end? Currently no tach, but i think I can set up a diagnostic tach my friend has to check rpm.
Bigshot posted 08-14-2001 03:36 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
have to check RPM's. Newer engines might have different gear ratios, etc. 15 will not make too much of a difference. Once you find out what you run WOT, send it to a prop shop and they can ad pitch, etc for a lot cheaper than a new prop. IE had a 10.5" made to a 12.5" and reconditioned(hub was cool) for $23.
L A posted 08-15-2001 11:58 PM ET (US)     Profile for L A  Send Email to L A     
Bigshot, I ran boat today with tach and gps. The 14 pitch ran wot 5900 rpm at top speed of 40.5 mph on gps, with a little chine walking. When I changed to the 15 pitch stilleto rpms dropped to 5600 and top speed was 43.2 mph on the gps. My friend drove the boat and got 44, he weighs about 175, I,m about 210. Interestingly the 15 prop with me in the boat was more stable and not as scary. However, I think the bottom end is not as good and the faster prop may not be a good choice since I use the boat for skiing and tubing with the kids. A 13 doing 43+ is pretty neat stuff, kinda gets the heart pumping! Anybody got any other ideas?
L A posted 08-16-2001 12:01 AM ET (US)     Profile for L A  Send Email to L A     
By the way, the same friend with the 2002 gls 13 ran 42-43 wide open new with the Merc 40 twin 2 stroke. He changed motor to 3 cyl 50 and now is running about 41-42 top speed. The new boat is a lot heavier than the old classic hull.
L A posted 08-16-2001 12:03 AM ET (US)     Profile for L A  Send Email to L A     
Correction! the new gls 13 ran 33-34 mph with the 40.
Bigshot posted 08-16-2001 10:05 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Stick with what you have if you are doing tubing etc. Maun thing is what is youe max rpms? If it is 5500, you can't be running 5900.

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