Prop Choice
#1
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Location: ALBUQUERQUE,
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Greetings All,
I am a transplant to the NW part of New Mexico, and the field I fly at is at about 6000 feet... back in New York the field was maybe 500 feet.
I have noticed that I dont get the climb performance here in NM I got in NY, so I think I need to switch props.. so do anyone who flys at 6000+ have any advice or know of a resource on the net I might find this info?
my plane is a Great Planes Big Stik 40 (kit built) weighing 6.3 lbs with a OS 70 4 stroke and a Master Airscrew 12-8 4 stroke prop (K series)
I would rather stick to MA props as they are not as brittle as APC.. and I dont have much ground clearance (1/2 inch) to play with, so a 13 inch prop is out..
thanks for the help & keep your glow plug out of the dirt
Charlie Fischer
I am a transplant to the NW part of New Mexico, and the field I fly at is at about 6000 feet... back in New York the field was maybe 500 feet.
I have noticed that I dont get the climb performance here in NM I got in NY, so I think I need to switch props.. so do anyone who flys at 6000+ have any advice or know of a resource on the net I might find this info?
my plane is a Great Planes Big Stik 40 (kit built) weighing 6.3 lbs with a OS 70 4 stroke and a Master Airscrew 12-8 4 stroke prop (K series)
I would rather stick to MA props as they are not as brittle as APC.. and I dont have much ground clearance (1/2 inch) to play with, so a 13 inch prop is out..
thanks for the help & keep your glow plug out of the dirt
Charlie Fischer
#2
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At higher altitudes you can use higher nitro - when I moved up here to Colorado, I moved up 5% in my nitro to help get back a little bit of the power in my 46FX. I run 30% in all of my saitos. You have lost about 20% of your power at 6000', just like me...
Also, I lost about 800 RPM with the same prop when I moved here, and that was with using 5% higher nitro. So for you, I would say try a lower pitch prop, like a 12X7, if the RPM doesn't go too high, or try a 12x6 three blade prop. (I have used 3-blade props alot, with great success. I don't think they are as inefficient as everyone states, when you compare the same brands.)
Hope this helps - NJD
Also, I lost about 800 RPM with the same prop when I moved here, and that was with using 5% higher nitro. So for you, I would say try a lower pitch prop, like a 12X7, if the RPM doesn't go too high, or try a 12x6 three blade prop. (I have used 3-blade props alot, with great success. I don't think they are as inefficient as everyone states, when you compare the same brands.)
Hope this helps - NJD
#3
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Location: Grand Rapids, MI
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Used a Master Airscrew ONCE!!! Never again! It was like something sucked the life out of my engine. Been running APCs ever since. Brittle or not.