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RCS 150 Radial

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Old 09-22-2008, 10:27 AM
  #1
YBP
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Default RCS 150 Radial

Hi.
First IĀ“d like to thank RC Showcase and Mike Dooley for the great service regarding my purchase of this beautiful radial engine!

I have one minor and one bigger issue with the engine.

IĀ“m running the recommended 26x16 prop for break in. 95octane gas with a good quality oil. (Castrol TTS) mixed at 30:1.
2300mAh 4-cell Ni-mh on ignition.

1:
I canĀ“t seem to get the midrange adjusted properly. When it is running good on full throttle and the idle is good, the midrange is way too rich and it drops a sylinder.
When I adjust the needles, especially the low end needle, I can get it perfect on midrange and on full throttle, but when the needles is adjusted for optimum performance between 1500-1800 and full throttle, it is way too lean on idle and just dies when I close the throttle.
I know the prop is on the light side, and it will probably get better with more prop. But I donĀ“t think it will be the complete cure.

2:
The last time I ran the engine, it suddenly got starved for gas. It would not run past 1/3 throttle and adjusting the needles had no effect.
The fuelfilter was nice and clean. I havenĀ“t checked the screen in the carb yet. The ignition battery was newly charged.
What do I check?

Thanks,
Lars.
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Old 09-22-2008, 10:32 AM
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Mike Dooley/RCS
 
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Default RE: RCS 150 Radial

You need to pull the airpump and airline, clean it, pull the carb, clean it, and try it again.
This is part of maintenance that must be done on a regular basis.
Also, you must be sure the ignition battery is OK too.
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Old 09-22-2008, 10:43 AM
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Default RE: RCS 150 Radial

Wow!
That was fast!

Thank you.
Is there a manual available on the engine?

Do you think it was the pump that messed with my idle/midrange problem too?


Thanks,
Lars.
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Old 09-22-2008, 02:08 PM
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Default RE: RCS 150 Radial

Found the problem! The airline from the pump was not routed through the little clip, so the collector had melted a small hole in the tube.

CanĀ“t wait to run it again!
This time with a Xoar 29x12 prop.

The engine will go in a Wildhare 35% Sukhoi.

Lars.
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Old 09-24-2008, 09:42 AM
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Default RE: RCS 150 Radial

Ran the engine last night.

With a leakfree airline and Xoar 29x12 prop, the engine performed flawlessly!!

The throttle response is just amazing.
It goes from slow idle to max rpm in an instant.
thanks again,
Lars.
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