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ContinuousWave: Whaler Performance
Can you turn a 12 5/8 x21 on a 115 Yamaha?
|Author||Topic: Can you turn a 12 5/8 x21 on a 115 Yamaha?|
posted 10-13-2002 01:18 AM ET (US)
I have a 1996 17 outrage with a 96 115 Yamaha. Current prop is 13x17. WOT now =6000 rpms. I was looking at a aluminum prop with a 21" pitch. Is this to much for a 115? I will have no less the 2-3 full size adults and 3/4 full tank [45 gal]90% of the time. I would like to pull a kneeboarder/tube. Shold I let this prop go and get a 19"? Any and all info is greatly appreciated. Thanks, Stan
|John from Madison CT||
posted 10-13-2002 08:02 AM ET (US)
You are turning a little too high RPM's with that Prop, but not really all that bad. Nearly all OB mechanics will say to be in the higher RPM range rather than lower.
Giddie Up and go get 'em.
John from Madison, CT
posted 10-13-2002 08:17 AM ET (US)
John's advice is on the mark... suggest you borrow a 19" and make a test run before buying! Happy Whalin'.. Clark.. SCN
posted 10-13-2002 11:17 AM ET (US)
What is the recommended maximum rpm for that engine?
If i'm not mistaken, i think it's close to 5,500 rpms.
By going from a 17 pitch, to a 21 pitch, your going to drop from 6,000 rpms, to 5,200 rpms.
For the best performance, [ & the engine will live longer ] prop it for the highest recommended rpm.
The reason for this is, if you prop it for the lower end of the rpm scale, & you put any type of load at all on the boat, your going to be lugging that engine/
It would be like towing a 22 ft boat behind a stick shift pickup, going up a steep hill in 5th gear, & not down shifting in order for your rpms to run at a normal rate, like going 30 mph up the hill, in 4th or 5th gear, with your foot to the floor.
Thats a sure way to kill an engine very, very fast.
posted 10-13-2002 01:47 PM ET (US)
Thanks, I will try and find a 19". are there any good placed to find used props? Thanks, Stan
posted 10-13-2002 04:05 PM ET (US)
Stan, if your current 13X17 prop is stainless steel, would you be interested in trading it for a 13X19 SS prop?
posted 10-13-2002 05:22 PM ET (US)
You have a working email? Thanks so much, Stan
posted 10-13-2002 07:59 PM ET (US)
If you are intrested in selling a 13x 19 or anyone else for that matter please email me @ firstname.lastname@example.org or email@example.com. Thanks, Stan
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