Zenith Aircraft Builders and Flyers
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ULPower 350i Throttle Spring
I’m kicking around the idea of releasing the throttle spring that pulls spring tension forward to WOT position. I have dual throttle control cables to the throttle with the passenger side friction collar removed. But to keep the throttle spring from creeping the throttle higher, I must keep a bit more friction on control cable than I like. So I can easily release the spring from the lever and go with no spring tension.
looking for thoughts from the field
Replies to This Discussion
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Permalink Reply by Kurt Van Hulzen on
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I had the same thought about the spring. I don't have dual throttles installed but plan to. I talked with a UL power rep at Airventure and they "didn't recommend it" since it is a "safety feature" to go to full throttle if the cable breaks. Essentially saying, probably correctly, that I'd get used to it over time. Having said that, these are experimental aircraft so I'd be interested in hearing if anyone actually has done this or if anyone has any knowledge of data regarding throttle cable breakage in the last 20 years.
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Permalink Reply by David Hall on
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I also have the same thought. In Canada the first 25 hours is with no passenger, but it can be used for training, so the first 5 hours I was flying with an instructor on the right side with the throttle friction cable locked open.
It has been a bit of hassle getting the correct amount of tension so that the right side was usable without the throttle creep, but it wasn't as bad as I expected.
I would still like to remove the spring to avoid the throttle creep and if throttle cable breakage is the only issue then, possibly I could reach accross and adjust the right side throttle. Not ideal, but with no spring it would have a better chance of staying in place for periodic adjustments. I won't do it yet and would like to investigate the linkage between the two cables to make sure that its robust before doing anything.
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Permalink Reply by Dave Blackburn on
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About 6 weeks ago, I disconnected the throttle spring by pushing the spring hook off the throttle connection plate that throttles cables connect. This way, there is no damage to the spring and can easily be reconnected. I can now use very little throttle friction on the pilot side. I could fly without any friction if I wanted to, but since I began flying - I always apply just a little fiction out of habit. So far, there's been no issues with the spring disconnected. Just to be clear, I am controlling throttle with a throttle control (push/pull style A800 style) cable.
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Permalink Reply by Larry Brons on
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In my 45 years of flying many different aircraft, this is the first one with a “fail to full throttle spring”. Knock on wood (metal), I’ve never experienced a broken throttle cable. I’m going to disconnect my spring. Thanks for the discussion.
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I just asked someone that very question today!
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