Need help with GMS .47 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 05-03-2004, 10:04 PM   #1
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Need help with GMS .47

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Hello Everyone,

I just broke in a gms 2000 .47 engine and mounted it inverted in my thunder tiger champion 45l. It runs great when the plane is stationary. On the take off role it loses full power and runs choppy till I land again. Who knows whats going on here? I am sure its not running lean also.


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Old 05-04-2004, 06:39 AM   #2
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Can you describe it a bit better? I mean, does it run rock solid the entire tank, while statiaonary and as soon as it starts moving it starts sputtering? Or do you have to get the nose up (in the take off) before the "choppiness" starts?

Off hand, it could be a few things:

#1 - if the tank is too low, it may be leaning out when you start to climb out
#2 - you may have a broken line or a pinhole in the pickup line which uncovers itself as the plane points up and the fuel goes to the rear of the tank, and air starts to enter the line
#3 - its possible you are running too rich

More info needed for a better analysis please...

Just a question, how experienced are you insetting up engines, ie, are you absolutely certain it isnt running lean?
Andrew Coholic -MAAC #26287L

1/2A to giant scale, IMAC, SAM, R/C sport, turbine jets, Heli's...
if its got a wing or two and an engine - I like it!
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Old 05-04-2004, 08:19 AM   #3
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It sounds like it's loading up as you taxing out to take-off. Because you have mounted the engine inverted it's going to run like crap until the engine is well broken and some engines never run well inverted. Try limiting the idle time to the very minimum. If you use a higher % of nitro such as 15 % this will help the idle immensely. The low end may be rich also. Good Luck and don't use a onboard glow all they do is mask the problem, they don't solve the problem.

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Old 05-04-2004, 09:53 AM   #4
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MY .47 took a loooooooonnnnnng time to break in.. It ran much better after it got some time on it.

The sooner you fall behind, the more time you will have to catch up.
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Old 05-04-2004, 01:47 PM   #5
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I leaned out the low end today and flew for about 8 minutes - It seemed to run fairly smooth. Still ample smoke coming out of pipe but I do find its running hotter than my os 46fx. The engine still hesitates a little so i'll have to tweek it some more. Are black patches in the grass after running it up stationary a bad sign - 46 fx doesn't do that?

This is my second plane and engine so I am still fairly green with all of this. Any suggestions or ideas you guys have would be greatly appreciated


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