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HelicopterScale Model RC Helicopters › huey tail drive wire or not to wire??
12-20-2013 05:05 PM  3 years agoPost 1
chopperbloke

rrApprentice

portsmouth hampshire​uk

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hello all i am in the final stages of my hirobo huey gasser biuld.
I am working with xcell petrol hechanics .the problem i have is now how to drive the tail as the drive out put on the xcell mechanics is 175 mm from the base??. so torque tube would not work as the tail doom on the huey runs an the bottom.
I have had some great advise from other members just want to ask in genral what others have use. Im aware the wire tail drives have a some what bad reputation but others would swear by them??
I am thinking of using the LEN MOUNT wire tail drive i hear this is very good and teflon lined .
i would be very greatfull to get feed back especially on tail drives that have to go up like on the huey as many other models

thanks

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12-20-2013 05:10 PM  3 years agoPost 2
Copter Doctor

rrProfessor

Enterprise/ft.rucker​,al- home of army​aviation

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I swear by the cable/flex drive but like anything else, done correctly it will work. I personally think the cable is more convenient for "raised" tails than any other method as it eliminates the need for an angled gearbox and you have two less attatchment points to maintain or fail on you.

drive a rotary, fly a rotorcraft

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12-20-2013 05:37 PM  3 years agoPost 3
goodhunting

rrApprentice

Slovenia ...​somewhere in Europe

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Where do you guys buy couplers?
I am working on a 600 size project from Approach Engineering and I need to attach the flex cable to mechanics...

gh

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12-20-2013 06:34 PM  3 years agoPost 4
Copter Doctor

rrProfessor

Enterprise/ft.rucker​,al- home of army​aviation

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ive been making my own, now that i have a laithe and the size cable i use comes brom a beechcraft King Air's flap system

drive a rotary, fly a rotorcraft

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12-20-2013 06:35 PM  3 years agoPost 5
Mojave

rrElite Veteran

Palos Verdes, Ca.​USA

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I swear by the Starwood contour drive. I have installed them in 2 helis and they work great. Couplers come with the drive, but you may have to mod stuff to get it to work in your application. Dr Tim cut me a custom length drive for my 800 size huey.
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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12-20-2013 06:51 PM  3 years agoPost 6
Dave Willis

rrVeteran

Sevierville, TN USA

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Contact Darrell Sprayberry and see if he can help you.

Dave

Futaba AMA 6679 IRCHA 675 VHA 11

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12-20-2013 07:02 PM  3 years agoPost 7
Dr.Tim

rrElite Veteran

Mojave Desert

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I love the Approach Engineering Contour Drive! Simply Nothing Better! Yes I am Bias ..

From Simple minds come simple ideas! Approach Engineering

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12-20-2013 09:11 PM  3 years agoPost 8
goodhunting

rrApprentice

Slovenia ...​somewhere in Europe

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I have Dr Tim's kit.. and it's been a blast so far...
What I'm looking for is a way to hold the coupler and the TT adapter in the tail assembly of the Trex600...

if someone has a good picture it will be worth more than a thousand words...

gh

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12-20-2013 09:17 PM  3 years agoPost 9
Mojave

rrElite Veteran

Palos Verdes, Ca.​USA

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I don't have any pics, but I have seen it done. There is a post in scale on how to do this mod. Or you can call Cliff at RCA and ask if he sells his pre-made adapter.
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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12-20-2013 09:54 PM  3 years agoPost 10
coptercptn

rrElite Veteran

Mesa AZ. USA

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Here ya go...
I made up the adapter... but so easy. Pull pin from torque tube and remove gear... Machine one end of adapter to fit this and hold with grub screws... machine other end of adapter to accept cable/wire. Done!!

Home of the "Sea Cobra".....

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12-22-2013 08:18 AM  3 years agoPost 11
goodhunting

rrApprentice

Slovenia ...​somewhere in Europe

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Thank you for the pic. They helped a lot. I got this far, but now I have the next question. This "loose end" with TT adapter fits in the tail section... rather OK. But how do I fix it in the mechanics part? I have a UH60 fuselage from RC Aerodyne (500 size) and the flex cable there has some sort of fitings to fix it in the mechanics. How do you tackle this issue.

gh

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12-22-2013 12:22 PM  3 years agoPost 12
Copter Doctor

rrProfessor

Enterprise/ft.rucker​,al- home of army​aviation

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the idea there is to have the cable guide supported all along its length, and especially where it goes into the mechs so its supported without the mechs. you can use ply bultkheads. this way the end of the cable(with adaptor in place) is right where it needs to be then when the mechs are put in, it simply plugs in. an aluminum or brass shaft guide/tube helps to make this easy as well.
it is for this and a few other reasons why I don't particularly care for mechs that have this type of tail drive system when it comes to using a flex drive. it works well but I like the security of an output shaft and a coupler, set screws hold everything in solidly.

drive a rotary, fly a rotorcraft

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12-22-2013 12:45 PM  3 years agoPost 13
goodhunting

rrApprentice

Slovenia ...​somewhere in Europe

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Ok I think I get it now.. let me play arround with my setup and I'll post some pictures... with more questios...

Thank you for the explanation.

Gh

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12-22-2013 03:31 PM  3 years agoPost 14
coptercptn

rrElite Veteran

Mesa AZ. USA

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You can also fabricate a shaft to couple the mechs with the cable using a short piece of the boom tubing and a bearing or two... this way it is supported from the mechs and leaves a shaft out of the back for a simple Shaft to cable coupler...
With the T-rex you can use the (two) bearings that are already in the boom tube and a short section (cut off) of torque tube...(Insert a solid shaft into the cut off torque tube.)

This whole assy. can then be held in place by the already installed housing and just leave about 2-3 inches of shaft hanging out for the coupler.. Sorry, I don't have a pic of how I have done this... but I think you get the Idea?

Home of the "Sea Cobra".....

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12-23-2013 07:09 AM  3 years agoPost 15
goodhunting

rrApprentice

Slovenia ...​somewhere in Europe

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Thank you guys. You gave me quite a few ideas. Currently I want to set up my mechanics in pod and boom first... just to check how it flies... At the same time I'm slowly building Dr Tim's work of art... Once I will check the mechanical setup I will build it into the fuselage. using one of the proposed options.

gh

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12-27-2013 12:25 PM  3 years agoPost 16
heliraptor

rrKey Veteran

Colchester, Essex,​UK

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Flexi Tail Drive

Hi

I've had great success using lens drive on various helicopters including a Scout and my LM Huey.

Not really sure what youy have to work with on the mechanics end, but here's a couple of images of my setups, one on the Huey and the second how I made the connection on an LM Apache.

I used various components, the main alloy coupler was supplied by Starwood, I'm sure they or Dr Tim could help you out, but in all honesty they are simple to make if you have access to a lathe.

The most crucial part of the process on the LM drive is sealing the end of the cable with silver solder, that has to be done right to ensure its longevity and maintain the counter wound structure.

They are easy to maintain, I remove mine every year, clean it up, check for signs of wear, lube and replace.

If you have any questions at all I'd be happy to help.

Lee

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12-27-2013 04:08 PM  3 years agoPost 17
coptercptn

rrElite Veteran

Mesa AZ. USA

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yep.. easy as that..
Installation being done on my Len Mount Cobra build;

Still have a few bulkheads to be made and final alignment work done.

But for these larger heli's I prefer a 1/4" (6mm) cable..

Home of the "Sea Cobra".....

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12-28-2013 03:26 AM  3 years agoPost 18
teamdavey2001

rrApprentice

Sunnyvale,​California, USA

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Is there any reason no one seems to use the collet fittings that the boat guys use to connect to the cable? They look like they would be much kinder than driving set screws into it, even with silver solder.

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12-28-2013 05:19 AM  3 years agoPost 19
Mojave

rrElite Veteran

Palos Verdes, Ca.​USA

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That's a cool idea. I think what keeps most folks from using the collets is that it's one more thing that you have to adapt to the drive/driven end of the system vs just having to drill open the ends that adapt the cable drive at each end.
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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12-28-2013 05:25 AM  3 years agoPost 20
Dr.Tim

rrElite Veteran

Mojave Desert

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I tried the collets but they wobble a bit. Thats why I went and machined couplers for our contour Drive. (No Wobble)

From Simple minds come simple ideas! Approach Engineering

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HelicopterScale Model RC Helicopters › huey tail drive wire or not to wire??
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