good prop size for gms 76 2s on a hobbico su 31 sukhio

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mv-warbird · 09-09-2006, 04:53 PM

i have a gms 76 with a bisson pitts muff on a hobbico su 31 and was wondering if the nylon 12-6 apc prop is to small for it.
after break in i proceeded to see what kind of rpms it would produce.
with a rather rich mixture it produced 11,300 rpms on 15% omega nitro.

am i in the ballpark with all these figures.the motor ran and has run flawlessly on the bench and in the airframe so far,didnt maiden it yet so i want to be sure.

thnx

mv-warbird

mv-warbird · 09-09-2006, 05:25 PM

you can view the plane in my photos if you want.

thanx again guys

MrKiwi · 09-09-2006, 10:58 PM

14/4 W

MrKiwi · 09-09-2006, 11:00 PM

and btw, ur gonna have to plug one of the holes. ur not gonna get a enough presure for the fuel to get into the motor. i found out the hard way.....

50%plane · 09-09-2006, 11:10 PM

Hey MV! I'm running the Tower .75 which is, I think, the same motor. After a rich break-in, I'm now running a 13/4 APC. I'm hovering at 1/8th throttle on my Funtana40. Since I'm not flying the motor at full power for extended periods, I don't have an overheating problem. I'm running the motor rich as it is now though.(not at peak RPM) using a Bisson pitts style muffler.

hope this helps!
50%

p sme · 09-10-2006, 05:22 PM

I had great luck with a APC 13x6. I tried all kinds of props on mine, even an APC 16x4...it kinda worked.

mv-warbird · 09-15-2006, 09:03 PM

thanks guys i put a 13-6 power piont on it and it seems to work just fine.
i didnt maiden her yet.the one gent said i would have to plug one of the port holes on the pitts.ive run 2 tanks though it on the ground and it hasnt stumbled yrt.
will it be different in the air.
i forgot to mention the muffler is of a 61 gms.
even though the bolt spacing is the same is the port smaller

09-09-2006, 04:53 PM	#1
mv-warbird Flyin' Around Join Date: Apr 2006 Location: new jersey Age: 41 Posts: 22	good prop size for gms 76 2s on a hobbico su 31 sukhio i have a gms 76 with a bisson pitts muff on a hobbico su 31 and was wondering if the nylon 12-6 apc prop is to small for it. after break in i proceeded to see what kind of rpms it would produce. with a rather rich mixture it produced 11,300 rpms on 15% omega nitro. am i in the ballpark with all these figures.the motor ran and has run flawlessly on the bench and in the airframe so far,didnt maiden it yet so i want to be sure. thnx mv-warbird

09-09-2006, 05:25 PM	#2
mv-warbird Flyin' Around Join Date: Apr 2006 Location: new jersey Age: 41 Posts: 22	Re: good prop size for gms 76 2s on a hobbico su 31 sukhio you can view the plane in my photos if you want. thanx again guys

09-09-2006, 10:58 PM	#3
MrKiwi Bad-ass Super Contributer! Join Date: Feb 2006 Location: San Jose, California Posts: 2,353 Awards Showcase Total Awards: 1	Re: good prop size for gms 76 2s on a hobbico su 31 sukhio 14/4 W __________________ Bayside R/C Tomcats Sheldons Hobbies World's longest thread!

09-09-2006, 11:00 PM	#4
MrKiwi Bad-ass Super Contributer! Join Date: Feb 2006 Location: San Jose, California Posts: 2,353 Awards Showcase Total Awards: 1	Re: good prop size for gms 76 2s on a hobbico su 31 sukhio and btw, ur gonna have to plug one of the holes. ur not gonna get a enough presure for the fuel to get into the motor. i found out the hard way..... __________________ Bayside R/C Tomcats Sheldons Hobbies World's longest thread!

09-10-2006, 05:22 PM	#6
p sme Bad-ass Super Contributer! Join Date: Jan 2006 Location: Cleveland, Ohio Age: 22 Posts: 249	Re: good prop size for gms 76 2s on a hobbico su 31 sukhio I had great luck with a APC 13x6. I tried all kinds of props on mine, even an APC 16x4...it kinda worked.

09-15-2006, 09:03 PM	#7
mv-warbird Flyin' Around Join Date: Apr 2006 Location: new jersey Age: 41 Posts: 22	Re: good prop size for gms 76 2s on a hobbico su 31 sukhio thanks guys i put a 13-6 power piont on it and it seems to work just fine. i didnt maiden her yet.the one gent said i would have to plug one of the port holes on the pitts.ive run 2 tanks though it on the ground and it hasnt stumbled yrt. will it be different in the air. i forgot to mention the muffler is of a 61 gms. even though the bolt spacing is the same is the port smaller

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