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HelicopterMain Discussion › Raptor 90 tail fix
07-20-2017 03:16 AM  9 months agoPost 1
OuttaControl

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Springfield, Missouri -United states

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As you guys know Raptor 90 parts are getting tough to find. I had a mild crash and broke the tail off my 90. I had parts to convert it to a 60 but didn't have a tail rotor control rod. I fixed it with a DuBro Flex Cable. I had to put a stiffener wire along each side of the cable tube. I also soldered about 2" on each end of the cable and put heat shrink over the stiffener wire and cable tube. I just zip tied it to the bottom of the tailboom. So far it works great. It's odd not seeing the control rod

Mine fall down, went BOOM!!

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07-20-2017 04:18 AM  9 months agoPost 2
EEngineer

rrProfessor

TX

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Nice job....

Here's a source for CF rods/tubes for any future issues:

http://www.gravesrc.com/parts-acces...r-products.html

Logo 600SXs, 800XX, TDR IIs

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07-20-2017 04:37 AM  9 months agoPost 3
OuttaControl

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Springfield, Missouri -United states

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CF source
Thanks for the link. I had a CF tube on it but it looked weird because it had to be so far below the tailboom. I think this will work good. It's slides really smooth so I don't think it'll cause any issues. The best thing about it was that it cost $4 to fix it!

Mine fall down, went BOOM!!

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07-20-2017 05:04 AM  9 months agoPost 4
EEngineer

rrProfessor

TX

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Excellent....as long as it's smooth, that's the main thing...

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07-20-2017 01:45 PM  9 months agoPost 5
Four Stroker

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Atlanta

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Flex cable not going to get the job done. There used to be aftermarket CF tube kits for this and tube ends - K&S, etc. I use this airplane stuff with JB weld. You can find a pushrod support from Align 700 or such.

https://www.centralhobbies.com/cat4...5&pgNum=1#begin

They used to have M2.5 but only M2 and M3 now.

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07-20-2017 01:59 PM  9 months agoPost 6
BeltFedBrowning

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Kansas City

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I have been using flex cable for 25 years with no issues.

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07-20-2017 03:14 PM  9 months agoPost 7
Richardmid1

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Leeds, England

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I can see this working great for helis where tail servos are pulling on the cable most of the time but not so great for helis where the tail servo pushes most of the time if there are any?

Of course during hard piro stops or fast backwards flight the servo will be pushing quite hard on that cable and you would have flex issues.

99% of the time it will work every time!

60% of the time, it works every time!

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07-20-2017 03:39 PM  9 months agoPost 8
Andy from Sandy

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Bedfordshire, UK

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Bowden cable has been used for many years on planes operating rudder and elevator.

Also check out Hirobo SDX as that uses the same to operate tail control.

The trick is to support the cable and make absolutely certain the outer cannot move.

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07-20-2017 04:32 PM  9 months agoPost 9
EEngineer

rrProfessor

TX

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"make absolutely certain the outer cannot move."

That's the key....

Even with a CF pushrod tube, I try to use 2 pushrod guides to keep flexing to an absolute minimum....and try to keep them aligned for as straight a "run" as possible for smoothness thru the guides.

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07-20-2017 04:52 PM  9 months agoPost 10
BeltFedBrowning

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Kansas City

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can you turn your tail servo horn 180 degrees to get it closer to the boom for a straighter shot? It would be less apt to flex the cable if you could strap down the ends of the outer sheath.

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07-20-2017 05:00 PM  9 months agoPost 11
EEngineer

rrProfessor

TX

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"turn your tail servo horn 180 degrees to get it closer to the boom "

I think that's a good idea...

Could also wick in some solder on the cable where after its exit from the outer tube for extra stiffness.

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07-20-2017 11:24 PM  9 months agoPost 12
OuttaControl

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Springfield, Missouri -United states

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Solder
I soldered each end of the cable about 2" back. The cable is REALLY stiff after you solder it. I also put a stiffener wire on each end that's about 5" long and then put heatshrink over it. I don't think there's much chance of it flexing too bad. All in all I like it and it's very inexpensive. Hey Belt Fed Browning yours looks good too!

Mine fall down, went BOOM!!

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07-21-2017 06:38 AM  9 months agoPost 13
grimthenoble

rrApprentice

Ketchikan, Alaska

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would think it would be easier to make a carbon rod than what you did. looks like a lawn mower throttle cable!

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07-21-2017 02:09 PM  9 months agoPost 14
OuttaControl

rrVeteran

Springfield, Missouri -United states

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Tail rod
I had a CF rod on it but it was at least an inch below the tailboom. I had to do this because I didn't trust that rod without any guides for it. Mine all got broken when I broke the tail off. May not be pretty but it sure as heck beats not being able to fly because I couldn't find parts.

Mine fall down, went BOOM!!

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07-21-2017 02:27 PM  9 months agoPost 15
Richardmid1

rrProfessor

Leeds, England

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Could you have put the servo arm pointing upwards so the rod was closer to the boom?

60% of the time, it works every time!

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07-21-2017 03:46 PM  9 months agoPost 16
EEngineer

rrProfessor

TX

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It's more work, but you could fabricate a PR guide from two pieces of plywood from your LHS.

Big hole halves for the boom....and smaller for the PR....and then CA them together on the boom....

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07-21-2017 05:13 PM  9 months agoPost 17
OuttaControl

rrVeteran

Springfield, Missouri -United states

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Tail rod
Yes Richard I tried to turn the arm 180 degrees but there isn't enough room. Engineer I thought about making some guides but it would have cost more. I flew the heli last night and so far it works really well. I was going to use the wire control rod that's on a Raptor 60 but I didn't have all the parts.

Mine fall down, went BOOM!!

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07-21-2017 05:19 PM  9 months agoPost 18
EEngineer

rrProfessor

TX

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"making some guides but it would have cost more"

Just a thought...but....it wouldn't look as nice as your method.

In fact, it would look crappy....

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07-23-2017 04:01 AM  9 months agoPost 19
OuttaControl

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Springfield, Missouri -United states

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Guides
Maybe not....depends who's making them!

Mine fall down, went BOOM!!

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07-23-2017 04:08 AM  9 months agoPost 20
EEngineer

rrProfessor

TX

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I meant if I made some out of necessity from ply....I know it would look crappy....maybe functional, but not pretty....LOL

Logo 600SXs, 800XX, TDR IIs

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HelicopterMain Discussion › Raptor 90 tail fix
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