OS 120 FSIII W/ Pump
06-20-2005, 07:01 PM
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OS 120 FSIII W/ Pump
Hi,
I have an OS 120 FSIII with Pump being installed into a 71" zero. I am looking to use a 3 blade propeller, which size should I use?
Thanks
I have an OS 120 FSIII with Pump being installed into a 71" zero. I am looking to use a 3 blade propeller, which size should I use?
Thanks
06-21-2005, 10:16 AM
#2
My Feedback: (11)
RE: OS 120 FSIII W/ Pump
We reallly don't recommend using 3-blade props for flying unless ground clearance becomes an issue. That's because they just aren't as efficient as the 2-bladers. Make a good 3-blader for display purposes. That's what the top competitors do.
As far as what size you need, we really can't be sure. Since a typical flying prop for the FS-120 Surpass III is a 15 x 8 prop (we use APC), you may need to get a 13 x 8 3-blader, or maybe a 14-incher. You'll want a prop that will allow the engine to turn in the low-to-mid-9,000's at full throttle when leaned to just rich of peak RPM. Any prop that runs the engine in that RPM range and flies the model well is OK.
As far as what size you need, we really can't be sure. Since a typical flying prop for the FS-120 Surpass III is a 15 x 8 prop (we use APC), you may need to get a 13 x 8 3-blader, or maybe a 14-incher. You'll want a prop that will allow the engine to turn in the low-to-mid-9,000's at full throttle when leaned to just rich of peak RPM. Any prop that runs the engine in that RPM range and flies the model well is OK.
