[NSRCA-discussion] Pull-Pull

Thu Jan 11 18:00:10 AKST 2007

Sorry Tom,  don't have any pics. Guess it's a little tough to describe 
clearly.
G.

----- Original Message ----- 
From: "Tom Mullen" <tommu at cleburne.net>
To: "'NSRCA Mailing List'" <nsrca-discussion at lists.nsrca.org>
Sent: Thursday, January 11, 2007 11:57 AM
Subject: Re: [NSRCA-discussion] Pull-Pull

> Is there a pic on this? I am totally lost.
>
> -----Original Message-----
> From: nsrca-discussion-bounces at lists.nsrca.org
> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of george w.
> kennie
> Sent: Wednesday, January 10, 2007 2:14 PM
> To: NSRCA Mailing List
> Subject: Re: [NSRCA-discussion] Pull-Pull
>
>
>
> Another utilization to remove the epidermis from Garfield is a method I
> used on my Fresca and my Cutting Edge. That is to Mount the elevator
> servo on it's side just ahead of the L.E. of the stab (servo output arm
> on fuse center ) and using about a 1&1/2" pushrod to drive forward and
> back, in an oscillatory motion, about a 6-8" piece of D.B. pushrod stock
> running longitudinally under the stab in two brass bearings/bushings
> (brass tubing ~ 1" long located near each end of the
> pushrod) which pushrod ran through the middle of a hardwood block about
> 1/2"X 3/4" which was epoxied and pinned to the pushrod. I fastened a
> piece of 1/16" dural about 3/4" wide tapering to about 1/2" at the ends
> to the block which was fabricated long enough to protrude/extend through
> the sides of the fuse under the stab and stick out about 3/4". I then
> used Excel ball and socket joints to connect from the aluminum slider to
> the elevator horns.Use of long nylon exit guides in the side of the fuse
> yielded a snug fit to the aluminum slider and acted as an anti-rotation
> device. The bearings eliminate any side to side movement and with
> careful installation consideration, the slider can almost disappear
> under the stab. I also used the ball links on the servo to slider
> connection and the total unit ended up very slop free. My reason for
> formulating this method was to address the temperature/trim phenomenon
> which I think was achieved. Just another option. G.
>
>
>
>
> ----- Original Message -----
> From: "Ron Van Putte" <vanputte at cox.net>
> To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
> Sent: Wednesday, January 10, 2007 1:28 PM
> Subject: Re: [NSRCA-discussion] Pull-Pull
>
>
>>
>> On Jan 10, 2007, at 12:14 PM, wgalligan wrote:
>>
>>> Ohhh yah   I forgot about that method.  Good one Bob.
>>
>> Geez!  I'd never even thought about using that method.  Thanks Bob.
>>
>> Ron Van Putte
>>
>>>
>>> ----- Original Message -----
>>> From: "Bob Miller" <n444bm at yahoo.com>
>>> To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
>>> Sent: Wednesday, January 10, 2007 10:50 AM
>>> Subject: Re: [NSRCA-discussion] Pull-Pull
>>>
>>>
>>>> I'm using a combination of MK bellcrank that is connected via pull
>>>> pull to the servo.  Works for me.
>>>>
>>>> Bob M.
>>>> ----- Original Message -----
>>>> From: "Dave Burton" <burtona at bellsouth.net>
>>>> To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
>>>> Sent: Wednesday, January 10, 2007 9:23 AM
>>>> Subject: Re: [NSRCA-discussion] Pull-Pull
>>>>
>>>>
>>>>> 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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>>>>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>>>>>>
>>>>>>
>>>>>>
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>>>>>>
>>>>>>
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>>>>>>
>>>>>
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