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Engine basics => Engine set up tips => Topic started by: Ron Cribbs on July 19, 2015, 10:06:45 PM
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Hey guys,
I have one of the aformentioned engines and I think from what I read that it's a combat engine.
It has a flat top piston and two BB races. I want to use it on a stunt plane because it's so darn pretty, just doubt if it would be worth it.
It's missing the venturi so of anyome has one I am all ears.
Ron
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This engine was a top choice for B and Proto speed fliers for many years. It really is a pretty motor! It may not be the best choice for a 'stunt' plane although it will take the same venturi as the stunt famous G-21 .46. It might be easier and more fun to save for a combat type plane!
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I threw one in my .46 thing to see whatd happen , along with OS 40 & others .
The engine was ex RC & not the best piston liner fit . Used .46 venturie .
Was the weakest uphill , on a 10 x 6 prop .
Thinking about it a 9 x 6 or a 10 x 4 or 5 ( narrow wood ) would be more sensable .
the 21/35 is the same porting , on a three blade 10 x 4 it hauled the Phantom round authoritively .
Steady Speed , Unmuffled . Wanna check under the piston at TDC , if its ' open under ' ( sub piston induction )
its not gunna be that good with a muffler .
Years ago I put a ETA 29 in a Early Bird combat wing with a 9 x 6 on 60 ft lines , it cruised at about 90 mph on a rich setting .
Probably a more enjoyable persuit with it. Though if it falls in a light F2B thing , give it a go .Probably wants to run at around
14000 if you want any powerthough , so wont want a big prop .
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It seems, with a few notable exceptions, that most .29 engines were designed for 5cc racing or free flight. I have an Enya .29 and after some research, have decided to sell it as they are unsuitable for stunt. The ST G21/29 appears to been designed for the same thing.