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rowlandcarson(at)gmail.co
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 Posted: Mon May 16, 2011 1:54 am Post subject: vernier throttle [was: throttle actuator authority] |
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On 16 May 2011, at 00:09, Bud Yerly wrote:
| Quote: | Those with vernier style throttles have a bit of a chore
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Bud - I'm intrigued to know that vernier throttles can be fitted to the Europa. I am a fan of vernier throttles ever since flying with one in a hired Bonanza years ago, but I don't think I've ever seen one fitted to a Europa. Can you advise how this is achieved?
I have seen push-pull throttle knobs with dual cables, but never one with vernier adjustment _and_ dual cables. Obviously one could make some sort of intermediate bellcrank arrangement under the cowl to operate 2 carbs from one cable, but I suspect that would be a lot of work to get approved here in UK. I'd hope that _if_ a dual-cable vernier knob was available, that could be installed without so much approval hassle.
(Yes, I know that instructors don't like vernier throttles as a student's hand can obstruct the lock, preventing the instructor from opening the throttle in an emergency. Yes, I know that military folk prefer lever throttles to push-pull. But I know what _I_ like!)
in friendship
Rowland
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budyerly(at)msn.com
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| Posted: Mon May 16, 2011 6:00 pm Post subject: vernier throttle [was: throttle actuator authority] |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> Rowland,
Verniers are great for throttles for aircraft which need a very fine adjustment like on the Beechcraft you flew. (I personally am a fan of the Debonair, loved it and the vernier prop control was really necessary due to its linkage.) However, by a chore I mean that you must come up with some sort of single to dual cable arrangement that is full proof and easily adjusted. The support of the cables, the vernier end and the fittings will run you well over $100. The vernier screw has a lot of leverage so it can easily pull hard enough to bend the idle throttle stop on the Bing style carb, so some sort of stop has to be included in the mechanism to prevent bending the stop from inside the cockpit when screwing out the throttle in the pattern. The ergonomics of the Europa interior make a vernier motion and attachment and plumbing in the panel a bit difficult without some time consuming cutting and fitting. Some of the nicest were in tunnels that were cut down to allow a flat area to rig the mechanism. I've even seen one through the panel, which makes panel removal more of a pain. I prefer to pull the panel quickly to get behind the panel work done by easily removing the whole box, so I have never done such an installation.
I have found that a lever is just dumb simple and the max and idle stops are a breeze to fabricate in minutes. I have spent hours making a lever to easily adjust my throttle friction to lock my throttle from creep, yet be easy to move in formation flying, and frankly it was a waste of time, but a fun exercise. Whereas the vernier has a lock built in. (Yes, I nearly cracked up a Zenith 701 during a STOL power off 35 knot min roll landing test, when on final, Roger, the Zenith factory pilot, locked the throttle on the pilot side while I was flying, which also locked my instructor side throttle. Luckily I swapped ends at the last second and prevented a bone crushing landing. Needless to say we discussed it over a beer.)
The Rotax / Bing carb does not require a very fine adjustment so I see no need for the extra time and effort on the installation, but by all means if you are interested in a one of a kind, personally customized aircraft, that is the beauty of the kit aircraft. If you want it, go for it. It is your time and patience.
Regards,
Bud
[quote] ---
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