[NSRCA-discussion] Pull-Pull

[Dave Burton]

Maybe I just don't get it, but any kind of tensioner or sliding servo is
just going to introduce slack into the rudder or elevator system when under
load. Why do you want that? Seems to me you would want the cables as rigid
as possible. That's how I've always set them up.

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Fred Huber
Sent: Wednesday, January 10, 2007 10:19 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Pull-Pull


Tensioner... servo mounted on sliding tray (we should al remember how to do
that from doing elevons without computer mixing... CF tubes instead of the
old nyrod on wire inherant slop should dissapear.) with a spring to pull the
servo in the opposed direction to the pull-pull wires.  (simplest
mechanicly... not sure if its the lightest)

You could play with the idea...

Run pull-pull back to a free pulley that is pulled by the tensioner spring,
taking the side load off the servo.  Slightly more complex and adds the
weight of the pulley, but should reduce servo wear.

If you like having a bellcrank to adjust travel relationshoip between servo
and pull-pull... mount the bellcrank on the sliding servo tray.


----- Original Message -----
From: "Jay Marshall" <lightfoot at sc.rr.com>
To: "'NSRCA Mailing List'" <nsrca-discussion at lists.nsrca.org>
Sent: Wednesday, January 10, 2007 9:07 AM
Subject: Re: [NSRCA-discussion] Pull-Pull


> Well then, no logical reason. All, including myself, agree that it works;
> I
> also use it. It would also seem that if a tensioner is used, as with
> timing
> belts on a car, that the
> trim-change-with-temperature-due-to-fuse-expansion
> problem would disappear.
>
>
> -----Original Message-----
> From: nsrca-discussion-bounces at lists.nsrca.org
> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Ron Van
> Putte
> Sent: Wednesday, January 10, 2007 9:15 AM
> To: NSRCA Mailing List
> Subject: Re: [NSRCA-discussion] Pull-Pull
>
>
> On Jan 10, 2007, at 8:09 AM, Gene Maurice wrote:
>
>> I have been using pull-pull on elevators for 15 years with great
>> success. It
>> is a little more difficult to setup, but once done, it is
>> completely idiot proof.
>
>
> Gene - I'm absolutely sure someone will say, "Well, you should know",
> but not me.  <VBG>
>
> Ron Van Putte
>
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