[NSRCA-discussion] Pull-Pull

Wed Jan 10 11:14:28 AKST 2007

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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>>>>>
>>>>>
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>>>>>
>>>>>
>>>>> --
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>>>>>
>>>>
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