stunthanger.com
Engine basics => Engine set up tips => Topic started by: Sam Laughery on April 25, 2006, 05:05:08 PM
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I have a Saito 40 on an ARF Cardinal. It ran perfectly last year with the following setup: APC 12 1/4 X 3 3/4 prop, pressurised clunk tank mounted on center with the engine. This was one of the best combinations I have ever used. This year starting with the first flight it runs fine right side up, inverted the engine slows by at least 15-20%. So far I've changed props (11 X 5 and 10 X 5) ,put on a wedge tank (and moved it up and down) and taken off the pressure. It runs exactly the same in every case. It seems to perform better once I get below 1/2 a tank of fuel. I'm on the verge of replacing the Saito with an OS 46.
Any suggestions would be greatly appreciated.
Sam
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Here are a couple of shots in the dark.
1) Change glow plug
2) Measure valve clearance
3) check to make sure that oil breather/overflow isn't clogged up from last year.
It isn't obvious to me why these things would affect normal vs inverted flight, but it couldn't hurt.