3 blade prop for OS 52 FS
09-11-2009, 12:35 AM
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3 blade prop for OS 52 FS
I'm about to launch into building a Dornier 335, 66" span and intend using an OS .70 FS up front and .52 FS out the back.
The OS manual for the .70 gives a suitable size for a 3 blade prop, and that's 11 X 7.
The .52 manual nominates 11 X 7-8, 12 X 6 and 12.5 X 6 as suitable in 2 blade props, but no recommendation for a 3 blade. I'm thinking 9 X 7 pusher would be OK. The range of sizes in pushers is limited, and even more so in 3 blade.
Does anybody have any thoughts, or experience on a 3 blade with an OS 52 FS??
04-11-2011, 05:11 AM
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RE: 3 blade prop for OS 52 FS
ORIGINAL: Semi Retired Aviator
I'm about to launch into building a Dornier 335, 66'' span and intend using an OS .70 FS up front and .52 FS out the back.
The OS manual for the .70 gives a suitable size for a 3 blade prop, and that's 11 X 7.
The .52 manual nominates 11 X 7-8, 12 X 6 and 12.5 X 6 as suitable in 2 blade props, but no recommendation for a 3 blade. I'm thinking 9 X 7 pusher would be OK. The range of sizes in pushers is limited, and even more so in 3 blade.
Does anybody have any thoughts, or experience on a 3 blade with an OS 52 FS??
I'm about to launch into building a Dornier 335, 66'' span and intend using an OS .70 FS up front and .52 FS out the back.
The OS manual for the .70 gives a suitable size for a 3 blade prop, and that's 11 X 7.
The .52 manual nominates 11 X 7-8, 12 X 6 and 12.5 X 6 as suitable in 2 blade props, but no recommendation for a 3 blade. I'm thinking 9 X 7 pusher would be OK. The range of sizes in pushers is limited, and even more so in 3 blade.
Does anybody have any thoughts, or experience on a 3 blade with an OS 52 FS??
The 11x7 Master Airscrew will work fine for your O.S. engine. I'm running a 10x7 on my Super Tigger .51 and it works just fine for that engine. I tried a 3-blade Master Airscrew 14x7 on my O.S. 91FX- Ringed and that engine loved it. I also run a Tru-Turn Spinner and adapter with all of them ranging from a 2"- 2-3/4".
You're good!
Pete
