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HelicopterEngines Plugs Mufflers Fuel › Moving from 30% to 15%
07-09-2008 10:40 AM  9 years agoPost 1


Sherman, Texas

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I have an OS91 sz on a Raptor 90, tuned and running good. It starts very good, has good transition, and good top end. I am not a 3D pilot and more of a 'scale like' person. I am running all head shims(that came with motor) with good smooth performance on 30%. If I move down to 20% or even 15% what will I probably need to do with the needles. I am often flying in 95F temp. Will I need to remove shims or should I try and fly with the shims and see what happens. Will I probably need to go more lean or more rich to keep the engine running smooth. I am all about a smooth running engine, some loss in power is not a big deal to me.


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07-09-2008 03:13 PM  9 years agoPost 2

rrKey Veteran

Newark, DE

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You may also need to change the plug as well. I find that enya 3's run pretty darn good in both my hyper .50 and my ys .90sr that is a hot plug so it should do well with the lower % of nitro.

Heli tools used: Torch, Pipe Wrench, 4 ft. crowbar

07-09-2008 10:32 PM  9 years agoPost 3

rrElite Veteran

Moline, il

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if your flying in hotter weather id stay with %30. itll cool the motor better in those hotter temps. i can never get a consistant running engine on %15. but maybe im not using the right plug.

07-09-2008 10:55 PM  9 years agoPost 4


Gilbert, AZ.

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With the lack of available 30% fuel, I think he is really asking what he can do to compensate. Not so much what he "should" be running.

Here in Arizona. We simply stopped flying for a few weeks a month to conserve our stock of 30%. No way we can run less nitro when it's around 107-115 outside.

Electrics don't fair so well in that heat either. Come on Olympics. get done and over with so Nitro is available again.


Team Synergy RC.
Team Scorpion. Team Magnum Energy.

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HelicopterEngines Plugs Mufflers Fuel › Moving from 30% to 15%
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