Comments - Throttle Reversing Bell Crank - Zenith Aircraft Builders and Flyers2024-03-28T15:35:16Zhttps://zenith.aero/profiles/comment/feed?attachedTo=2606393%3ABlogPost%3A701428&xn_auth=noJohn Heather brought to my at…tag:zenith.aero,2020-02-25:2606393:Comment:7110032020-02-25T15:45:32.621ZJohn Austinhttps://zenith.aero/profile/JohnLAustin
<p>John Heather brought to my attention an important point: the vernier-assist function works best with the friction twisted to the max. If you have no friction on the throttle, the vernier-assist won't work. In practical use, I found that moderate amounts of friction will allow the vernier-assist to advance the throttle, but is less-precise or slips when trying to retard the throttle with the vernier-assist. In my case, this is probably because I have a spring to bias the bell crank towards…</p>
<p>John Heather brought to my attention an important point: the vernier-assist function works best with the friction twisted to the max. If you have no friction on the throttle, the vernier-assist won't work. In practical use, I found that moderate amounts of friction will allow the vernier-assist to advance the throttle, but is less-precise or slips when trying to retard the throttle with the vernier-assist. In my case, this is probably because I have a spring to bias the bell crank towards open throttle should the throttle cable break, and the constant spring tension assists the vernier-assist towards advancing the throttle whereas it slips in the other direction because it is "fighting" the spring. Bottom line, if twisting the vernier-assist and it's not very responsive, give the friction ring a twist!</p> John:
This looks great! I s…tag:zenith.aero,2019-12-02:2606393:Comment:7020752019-12-02T03:03:34.439ZKevin Powellhttps://zenith.aero/profile/KevinPowell
<p>John: </p>
<p>This looks great! I saw the McFarlane vernier assist controls at Oshkosh this summer and thought, "Wow, these are nice! I want to use these.", and here you've done all the development for use with an Aeroinjector unit. Very nice installation; thanks for this post!</p>
<p>John: </p>
<p>This looks great! I saw the McFarlane vernier assist controls at Oshkosh this summer and thought, "Wow, these are nice! I want to use these.", and here you've done all the development for use with an Aeroinjector unit. Very nice installation; thanks for this post!</p> You're correct, Bob - both th…tag:zenith.aero,2019-11-30:2606393:Comment:7018642019-11-30T03:34:48.241ZJohn Austinhttps://zenith.aero/profile/JohnLAustin
<p>You're correct, Bob - both throttle and mixture function as normal push-pull cables. There are no locks or release buttons. The mixture is simply push-pull and then vernier-assist to fine tune (no friction adjustment, but usually not necessary for a mixture control). The throttle is push-pull, vernier-assist, and has a knurled friction adjustment ring. The nice thing is even when you stiffen-up the friction a bit, the vernier-assist still works. I recommend buying them direct from…</p>
<p>You're correct, Bob - both throttle and mixture function as normal push-pull cables. There are no locks or release buttons. The mixture is simply push-pull and then vernier-assist to fine tune (no friction adjustment, but usually not necessary for a mixture control). The throttle is push-pull, vernier-assist, and has a knurled friction adjustment ring. The nice thing is even when you stiffen-up the friction a bit, the vernier-assist still works. I recommend buying them direct from McFarlane - mention you're an AOPA or EAA member and they'll give you an additional 5% discount. (Actually, I think they'll give the discount to anyone - they don't ask for any membership numbers, etc.!)</p>
<p>Try'em ... you'll like 'em! :>)</p>
<p></p>
<p>John</p> A nice design, John. Well don…tag:zenith.aero,2019-11-30:2606393:Comment:7017742019-11-30T03:19:04.044ZBob Pustellhttps://zenith.aero/profile/BobPustell
<p>A nice design, John. Well done! A question about the throttle and mixture cables you are using - confirm they have normal push-pull function? You don't need to push a release button in the middle to allow push-pull operation like most aircraft vernier controls? If yes, I like that a lot! An normal "button to release for push-pull" for mixure or prop RPM controls are not much of a hassle and work well, but a vernier throttle is a pain when taxiing or when flying in formation. Both those…</p>
<p>A nice design, John. Well done! A question about the throttle and mixture cables you are using - confirm they have normal push-pull function? You don't need to push a release button in the middle to allow push-pull operation like most aircraft vernier controls? If yes, I like that a lot! An normal "button to release for push-pull" for mixure or prop RPM controls are not much of a hassle and work well, but a vernier throttle is a pain when taxiing or when flying in formation. Both those efforts require frequent power adjustments and needing to push that little release button in the middle of the throttle knob is a royal pain in the fanny. However for fine tuning cruise power and such a vernier function is da best. So, if these knobs provide unimpeded push-pull function but also provide vernier adjustment ability, I want them!</p>