Replies to This Discussion

Permalink Reply by David J. Beaulieu on February 11, 2022 at 3:00pm

Probably a question best asked of UL Power directly.  Please post their reply so we all know.  Cheers!

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Permalink Reply by Mel Asberry on February 13, 2022 at 10:26am

At this juncture, UL Power is "Dancing" around the question without a definite answer.

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Permalink Reply by Douglas Kupersmith on March 12, 2022 at 5:20pm

I'd be curious what you would like the throttle arm to do in the event of a throttle cable disconnect.

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Permalink Reply by Mel Asberry on March 12, 2022 at 6:07pm

I would like it to remain where it is, as it does on almost all other aircraft.  Problem with loaded to wide open is that one must tighten the friction lock to prevent creeping.  This restricts the co-pilot's throttle.

Rotax is the only other engine I'm aware of that loads the throttle to side open.

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Permalink Reply by Douglas Kupersmith on March 14, 2022 at 1:03pm

I think I would rather have the option of getting full power out of my disconnected engine in the event I broke the throttle control pulling back to idle during a normal descent. That could just be me though.

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Permalink Reply by Mel Asberry on March 15, 2022 at 7:50am

Yep, to each his own.  Not advocating this for everyone.  I've been flying for 55 years and never had a throttle cable break.  Of course. I've also never used stranded "pull only" cable either.  I use solid push-pull cable or pushrods.

I designed a pushrod setup for the Rotax powered CH601HDS that I built in the mid 90s and it has over 2500 trouble free hrs on it.

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Permalink Reply by Eric Johnson on March 19, 2022 at 8:11pm

" Problem with loaded to wide open is that one must tighten the friction lock to prevent creeping."

AHA! So that is why I need to continually adjust the throttle back and relock it on my 260. Seems like most of the time I can't get it tight enough to stay where I want it. I knew it was loaded to wide open, but never realized that until now.

I can't imagine removing the spring would do anything to the engine's reliability. 

Is there some way of spring loading it to mid throttle position? Have some mechanism that pulls both open and close and meets in the middle? Or is the throttle cable only supposed to pull the throttle closed and the spring pulls it open?

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Permalink Reply by Mel Asberry on March 22, 2022 at 7:21am

I would not want to add complexity to the situation.

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Permalink Reply by John Bell on September 17, 2022 at 7:35am

I’m of the same opinion on this and would love to see UL come up with an “optional procedure” or kit to remove the spring. I urge owners to provide feedback to UL. The full return and required friction knob setting seems to cause problems at the least opportune times.

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