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Old Jan 02, 2012, 06:56 PM
bill24orange is offline
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Wanted

oX FS/70 Prop size


Can anyone share with me the best prop results you have had on an OS FS/70 Surpass II ? The book gives several but they all appear to be pretty small to me. I have the motor on a Great Planes Revolver 46-55 size. 59in. wingspan and weight of 7lbs.
Appreciate any help .
Bill
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Old Jan 02, 2012, 07:04 PM
Red Raider is offline
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I like 13x6-13x7 or maybe 12x8 APC . I use a tach and do not like to rev more than 10,000 rpm on the ground. APC's will normally give you the best performance but they are not very pretty. IMHO
I let the tach and type of plane/flying decide what prop. Large diameter low pitch for larger slower planes and smaller higher pitch for slicker planes like the Revolver
Old Jan 02, 2012, 07:41 PM
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I only use a a 14x6 or 14x8, It's a 4 stroke, they don't like to be revved up. I prop .70 for 8500 to 9000 on the ground, it will do go to 10,000 in the air. 1.20 size prop for 7500.
Old Jan 02, 2012, 07:56 PM
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Thanks,
That is just what I needed. I was tacking around 11000 with the 12-6 they suggested and I felt like that was too high for the 4 stroke.
Bill
Old Jan 02, 2012, 09:51 PM
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I had an os 70 FS on a Venus II .40 size. I put an APC 11-11 and it was fast and had plenty of RPM to spare. 12-6 would be a good sport fly prop but on that revolver I would go for speed! 11-11 or 11-10 would be your best bet.
Old Jan 03, 2012, 11:14 AM
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im running a 12x8 master airscrew k series on a super decathlon 40 size plane and it runs great with out any problems

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