REFLECTOR: Dual Throttle Quadrant Part 4

[Alex Balic]

Richard- 

Probably would be best with the coaxial setup that you have to run the
control cables directly from the tubes using bellcranks that way, you should
have less friction then running the cables from one quadrant and having that
quadrant being driven by the linkage off of the tubing- nice work though- I
think you are almost there- any way to incorporate bearings into the
design?- might need to use larger diameter tubing, but it would really
reduce the friction a lot.- don't worry about the weight- most Velocities
need weight up front anyway..

 

Alex

 

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From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Jack Prock
Sent: Sunday, November 25, 2007 12:16 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Dual Throttle Quadrant Part 4

 

Has anyone looked at or experimented with this:

 

http://triketek.com/linear_dualthrottle_main.html

 

It may not be hefty enough for our needs, but it would eliminate the 
dual cables back to the engine. 

 

Jack

----- Original Message ----- 

From: Richard J. Gentil <mailto:richard at naples-air-center.com>  

To: Velocity Aircraft <mailto:reflector at tvbf.org>  Owners and Builders list 

Sent: Sunday, November 25, 2007 9:38 AM

Subject: Re: REFLECTOR: Dual Throttle Quadrant Part 4

 

Larry,

The order on the quadrants are on each side:

Outboard - Throttle
Center - Prop
Inboard - Mixture

The largest diameter tube is also the shortest length tube and the Throttle
connects to it on both quadrants.

The middle diameter tube is the next longest length tube and the Prop
connects to it on both quadrants.

The smallest diameter tube is the longest length tube and the Mixture
connects to it on both quadrants.

I attached two pictures,

Richard


lawrence epstein wrote: 

The system you have in the last photo looks like a good solution, except I
am concerned about having the controls in a different order left-Right on
the 2 quadrants.

I like the idea of completely separate systems back to the engine
compartment. This eliminates a single point failure (of both controls) mode.

What does the factory system look like (I think they offer that option?)

Larry Epstein






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Date: Sun, 25 Nov 2007 00:41:27 -0500
From: richard at naples-air-center.com
To: reflector at tvbf.org
Subject: REFLECTOR: Dual Throttle Quadrant Part 4

Sorry for so many emails. I am lousy at descriptions and I do much better
with pictures.

The next direction is I took three pieces of steel tubing from Aircraft
Spruce and put one inside the other. Then I braised on steel tabs and used a
bolt on each side braised to a flat plate for a bearing to pivot on. For my
linkages, I took flat steel rods which I cut and drilled 6 exact duplicates
which I attached with clevis pins to the throttle quadrants and tabs on the
steel tubes. Then I took the reversing throttle quadrant on the co-pilot's
side and modified it so it would be non reversing, which is needed with this
new idea I am trying.

I attached a picture of what I hope will be the solution for dual quadrants.
I was wondering if anyone has been down the current road I am headed and has
any pointers.

This is turning into a HUGE time sink. Almost makes me wish my wife were not
a pilot too, which would have negated the need for dual throttles.

Richard 


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