GMS 47 Mixture Problem

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JJ - 16 May 2004 01:42 GMT

I have a GMS 47 with a APC 11X5 prop mounted in a Sig SE . It has lots
of power, will go vertical forever. Mine idles great, transititions
good, and even shuts off. Now for my problem; Unless I set it very
rich on the ground (guessing 1500 below peak with lots of smoke) it
wants to quit at the top of a loop. I am thinking it must be leaning
out as it goes over the top, but it will go vertical as long as I
want. I have checked the tank, fuel lines and clunk. It seems if it
was a pressure problem it would lean out when vertical also. Anyone
else have this problem? Does this engine just really unload in the
air? I also have a OS 46FX and a Magnum XLS46, they are both good but
the GMS puts out more power.

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Paul McIntosh - 16 May 2004 09:27 GMT

Sounds like the fuel tank is well below the carb level. I had exactly the
oposite problem with an inverted OS .91 Surpass. It would go very rich
every time I pulled a lot of positive Gs.

Check the fuel tank placement relative to the carb.

--
Paul McIntosh
http://www.rc-bearings.com

> I have a GMS 47 with a APC 11X5 prop mounted in a Sig SE . It has lots
> of power, will go vertical forever. Mine idles great, transititions
[quoted text clipped - 7 lines]
> air? I also have a OS 46FX and a Magnum XLS46, they are both good but
> the GMS puts out more power.

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Model Forum / Radio Controlled / Air Models / May 2004

GMS 47 Mixture Problem