OsMax91/ 4 stroke on a 15/8 prop-To big ?
09-16-2006, 12:18 PM
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RE: OsMax91/ 4 stroke on a 15/8 prop-To big ?
I think you may be overdoing it. My enya 90 is happy with a 14x8. Saito recommends a 15x4 for the max diameter on their 91.
09-16-2006, 01:29 PM
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RE: OsMax91/ 4 stroke on a 15/8 prop-To big ?
Hi!
Too big for what?
You can put on a 20" prop but performance will suffer and heat will increase.
15x6 is what Great Planes recommends for a .91 four-stroke in a "You-can Do .61" and to me that sounds good, I use the same size prop in my You-Can Do but use MVVS .91 two stroke instead.
Regards!
Jan K
Too big for what?
You can put on a 20" prop but performance will suffer and heat will increase.
15x6 is what Great Planes recommends for a .91 four-stroke in a "You-can Do .61" and to me that sounds good, I use the same size prop in my You-Can Do but use MVVS .91 two stroke instead.
Regards!
Jan K
09-16-2006, 05:06 PM
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RE: OsMax91/ 4 stroke on a 15/8 prop-To big ?
Hobby Services (OS warranty and service people in the US) recommends using a prop that lets the engine turn 9500 to 10000 rpm on the ground. My OS 91 is pretty new, less than a gallon through it, and a 14x6 gives this range running fairly rich.
09-16-2006, 06:19 PM
#5
RE: OsMax91/ 4 stroke on a 15/8 prop-To big ?
if you want to use an 8 pitch prop you may have to go to a 14 inch diameter.nothing wrong with trying the 15/8 and if the rpm is to low cot about 1/4" off each tip,rebalance then recheck the rpm/performance till you get what you want
