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HomeAircraftHelicopterMain Discussion › Any heli's use pull - pull cable controls?
04-02-2005 10:49 PM  13 years agoPost 1
raptorbasher

rrApprentice

Bristol, England

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Hi Everyone,

Just been making new links and rods for my zoom and got thinking about the pull wire type controls from some planks and boats rudders and wondered if any one has seen or used cables from the servos to the levers.

Just wondered as you could pre tension the system to elminate any slop.

Any info for a curious mind...

thanks

Tim

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04-03-2005 12:05 AM  13 years agoPost 2
I3DM

rrProfessor

Israel

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Colin, if they can move the rudder of a 4 meter 3D airplane, they are NOT spongy !

good question actually...

www.liorzahavi.com

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04-03-2005 12:18 AM  13 years agoPost 3
Ted Toth

rrElite Veteran

Myrtle Beach S.C.

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The only difference between a push pull rod setup
and a cable pull pull it that a cable can span a longer distance
so it is not needed on a heli and is easier to set up rods

.

You don't stop laughing because you grow old, you grow old because you stopped laughing.

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04-03-2005 01:53 AM  13 years agoPost 4
Helinutnz

rrElite Veteran

below 42 South

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servo support
I also imagine that unless you were running a servo output support you would put stress on the output bearing as there would be a necessity to tension the cables somewhat to avoid unwanted slack in the change over from one direction to the other. The rods don't need tension so don't put pressure on the servo output and in fact due to there inherent stiffness actually negate the requirement for any output support.

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04-03-2005 01:55 AM  13 years agoPost 5
eric_brrKey Veteran - Denver, CO, USA - My Posts: All  Forum  Topic

The only pull-pull cable setup that comes to mind is the scale tail rotor pitch control linkage that Peter Wales put on one of his Lamas (pictured below). The detail of his models is here

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04-03-2005 03:46 AM  13 years agoPost 6
pphil611

rrApprentice

South Dakota

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pull pull cables
never seen that done however I have been using 1/4 scale flex rod for the tail rotor pitch control on all my helis with good results. Two gassers and two Vigors.

Spectra-G, MAH, CSM

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04-03-2005 10:21 PM  13 years agoPost 7
burl

rrApprentice

Port Angeles WA

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how about push-push with two rods. that would eliminate need for tensioning cables, but double the weight. kinda sheds light on why most are usually push-pull with one rod.

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04-03-2005 11:24 PM  13 years agoPost 8
RussD

rrVeteran

UK

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Hi ya.....

Not sure on the latest versions, but the Original Kyosho Caliber 60 ran push-pull tail linakge via small dia carbon rods... it worked very well :-)

RussD.

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