REFLECTOR: Dual Throttle Quadrant Part 4

[Richard J. Gentil]

Scott,

It does weigh several pounds but I thought it was worth the extra weight 
in order to get the added rigidity steel provides to guarantee no play 
in the assembly. I also put in grease holes so all three tubes can be 
lubricated without having to disassemble the entire structure. 
(Disassembly would require welding and is not an option.)

Right now I have the assembly perfectly level relative to the fuselage 
and all 6 holes for attaching the two quadrants are perfectly aligned to 
one another as you could see by putting a number three bolt through the 
attach holes each side. When both quadrants are connected to the 
assembly you get full travel on both sides and little to no friction 
from the assembly. That way the only friction should be from the single 
Bowden Cable going to the control arm on the engine. That I hope will be 
manageable. If it is not, then I was thinking of switching to push rods 
as used on the ailerons.

Richard

Scott Derrick wrote:
> Richard,
>
> Whewww!  That is a lot of work!  The 3 tubes in one looks like a huge 
> structure.  Go any idea how much it weighs? Thought about duplicating it 
> in ty or aluminum?
>
> I've got dual throttles, but used regular push pulls.  There is 
> considerable force required to move them and I'm not sure yet how my set 
> up will play out.  My dual cable meet at the servo.
>
> I wanted to use a mixer mounted up front and run just one cable to the 
> engine but never saw one I really liked.
>
> Somebody mentioned using dual high quality push-pull cables like our 
> aileron cables, I would like to see that setup with a list of 
> manufacturers for he push-pull control and the cables..
>
> Scott
>
>
> Richard J. Gentil wrote:
>   
>> 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
>> ------------------------------------------------------------------------
>>
>>
>> ------------------------------------------------------------------------
>>
>>
>> ------------------------------------------------------------------------
>>
>> _______________________________________________
>> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
>>
>> Visit the gallery!  www.tvbf.org/gallery
>> user:pw = tvbf:jamaicangoose
>> Check new archives: www.tvbf.org/pipermail
>> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>>     
>
>   
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.tvbf.org/mailman/private/reflector/attachments/20071125/5e0f3caf/attachment.htm