[NSRCA-discussion] Pull-Pull

Fri Jan 12 07:51:19 AKST 2007

Thats too heavy Mike <G>

----- Original Message ----- 
From: "Dr. Mike Harrison" <drmikedds at sbcglobal.net>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Friday, January 12, 2007 10:16 AM
Subject: Re: [NSRCA-discussion] Pull-Pull


> 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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