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mkiv_bldr

throttle quadrants

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I've got a question regarding throttle quadrants. I've seen that some folks are using "non-Brock" quadrants - Wicks, Vans, etc...

 

Are there any hook-up or operational issues when using a quadrant design for a tractor aircraft? Any "logic" changes in how they work?

 

Thanks !

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There are many issues with using tractor airplane throttle quadrants and push pull controls on Cozy type airplanes. Usually the tractor airplane controls are very heavy and require much longer cables that reverse direction under the panel and then proceed back to the engine.

 

The Brock throttle quadrant and cable setup is ideal from a weight and human engineering standpoint(This is my opnion based on flying many certified aircraft and my cozy for 16 years)but it leaves lots to be desired when it comes to installation, and performance. The first thing is that it is designed to be used with choke cable type cables. This means all the controls must have return springs which add to the force required to operate the controls and the controls do not operate well at all. By far the best type cables to use on all controls are the marine type push pull type with standard aircraft rod ends at the quadrant end and whatever is required at the other end. Having said this, what is needed is new version of the Brock type throttle quadrant that is designe to use the push pul cables with standard aircraft rod ends. it is possible to modify the Brock quadrant to use a push pull cable for the throttle only.(folks that use the Ellison throttle body or other fuel injection systems do this). This can be seen in the CSA newsletter.

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I bought a Vans three lever quadrant and built a center console around it for my Cozy IV. It looked good and worked smoothly, but I just hit a problem and had to scrap the whole idea - the problem is passenger hip width.

 

A close friend, who will be travelling with me regularly, is fairly "wide". With the center console in place his hips simply won't fit. The maximum available width with the console in place and no modification to the arm rests is about 17.5 inches. He be uncomfortable and, if he forced himself into the gap, circulation would be cut off by the pressure. With the center console out he'll fit quite nicely.

 

Because of this I'll be using a vernier throttle on the panel. Anyone want to buy an Van's quadrant?

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Thanks for the reply and the offer for the quadrant, John. Unfortunately, I already have the Van's component and am working it into my fusalage. Sounds like you now have a bit of work to do replacing your sytem. Good luck!

 

Alan Wirbisky

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