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Author Topic:   The Perfect Pitch
jimh posted 07-01-2000 07:30 AM ET (US)   Profile for jimh   Send Email to jimh  
I put a new prop on my 15-Sport with 50 HP Merc, and I am very pleased with the results.

I was using a MERC BLACK MAX 3-blade, 10.125" x 15" prop, but I felt like this was too much pitch. The boat did not have good mid-throttle response; it ran like a car would if you were stuck in 5th gear.

So I moved down to a MERC BLACK MAX 3-blade, 10.375" x 14" prop. As I handed over the credit card at the Merc dealer for this one, I was wondering if changing the pitch by just one inch would make much difference.

But despite such a minor change in the prop, the results are significant. The boat now handles the way I want it. It feels like we're not stuck in overdrive. There is much smoother mid range power. When in a seaway, the boat has much better handling and response.

10.125 15 5200 32+
10.375 14 5400 [n.a.]

Both props are of similar design and have cupped blades. The operating range for the engine is 5000 - 5500 RPM.

It might be good to note that my engine is a 1976, so the rating of 50 HP referred to powerhead horsepower. A current 50 HP outboard would have 50 HP at the prop and could possibly handle the taller pitched prop better. Also, the 24-year old engine might be a little tired, too.


Clark Roberts posted 07-02-2000 06:50 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Jim, smart move re: the prop... and older engines sometimes need to be repropped after 25 years to compensate for a little loss of power... In my opinion (and I have on on every subject.. heh, heh), the prop is the most important single item! Just remove it and see how far boat will go! Again, thanks for your fantastic work on this forum! Happy Whalin'.. Clark.. The Old Man and the Sea

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