[NSRCA-discussion] Pull-Pull

Fri Jan 12 07:17:04 AKST 2007

Guys,
I have been using the dubro 4-40 pull system for years.  I have never had a 
failure and everything is included.  I weighed the cable I used and it was 4 
grams.  Doesn't include the hookup stuff.  It is cat # 518 and costs about 
$9.  nylon coated steel cable.
Mike
----- Original Message ----- 
From: "george w. kennie" <geobet at gis.net>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Thursday, January 11, 2007 8:59 PM
Subject: Re: [NSRCA-discussion] Pull-Pull


> 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
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> NSRCA-discussion mailing list NSRCA-discussion at lists.nsrca.org
>>>>>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
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>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
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>>>>>>>
>>>>>>>
>>>>>>
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>>>>>
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