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HomeAircraftHelicopterFuel-Helicopters New or Limited ActivityNext D › my torque tube broke in flight
05-09-2011 06:09 AM  7 years agoPost 1
TattooArtist

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Chestnut Ridge NY

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I was flying my rave env today and after i did a 540 stall turn.it did a xtra 240 turn.then i realized i had no rudder.I hit hold and ended up doing a piro Auto.
After inspecting it. my torque tube was broken.
what gives any one else has had this
IM SO GLAD I WAS ABLE TO SAVE IT.I was so high on Adrenalin
WHAT A RUSHHH lol

ALEX

Team Gaui/Empire Hobbies ,RcRcc,

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05-09-2011 06:15 AM  7 years agoPost 2
the collective

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Bayside, NY, U.S.A

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That had to be an awesome save... good one!

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05-09-2011 10:32 AM  7 years agoPost 3
cyr

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france

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Hi,

How many flights with this torque tube ?

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05-09-2011 11:29 AM  7 years agoPost 4
gotnoclue

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sydney

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wow, very lucky.
how tight was the bolt and nut? maybe it stressed there?

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05-09-2011 01:33 PM  7 years agoPost 5
TattooArtist

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Chestnut Ridge NY

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thanks guys it felt really good to be able
to save it.
i purchased this rave used here on rr
back in nov/dec i have been flying it all
winter long i have put about 100 flights
i went over the entire machine but never
checked the torque tube.
i will remove the screw to see if it was
over tighten.

Team Gaui/Empire Hobbies ,RcRcc,

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05-09-2011 01:40 PM  7 years agoPost 6
PetterS

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Gothenburg, Sweden

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According to manual the tube is to be fastened with red loctite. Looks dry on the picture.

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05-09-2011 02:49 PM  7 years agoPost 7
TattooArtist

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Chestnut Ridge NY

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red lock tight
i thought about that too do i removed the screw
and its glued in their..

Team Gaui/Empire Hobbies ,RcRcc,

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05-09-2011 02:52 PM  7 years agoPost 8
PetterS

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Gothenburg, Sweden

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Not the screw. The tube against the arrowhead so to say.

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05-09-2011 05:53 PM  7 years agoPost 9
TattooArtist

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Chestnut Ridge NY

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i cant tell.i quess its one of
those things we wont figure out..

Team Gaui/Empire Hobbies ,RcRcc,

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05-09-2011 08:26 PM  7 years agoPost 10
CHiatt

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Winter Garden, FL

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Proper torque tube bonding...
The TT ends are bonded to the aluminum tube with red loctite and captured with a screw that goes through both. I had an end come loose too. I found it when doing an inspection load test by twisting the tail rotor and observing the drive system, where I detected 'slip'. When I pulled the screw, the drive shaft end slid right out of the tube, the loctite let go of the drive shaft end and not the tube wall. Eventually the cross screw would have stressed the tube and it likely would have failed similar to the one in the picture above.

I was in a hurry to build this machine and follow good bonding practices when using loctite for this type of joint. I suggest using the following method: lightly abrade the aluminum drive shaft ends with either scotchbrite or 320 grit wet/dry sandpaper (these parts have almost a mirror finish with nothing for the loctite to 'bite' into), clean drive shaft end and the I.D. of the tube with acetone (recommended by loctite in leu of using Primer T or N) prior to bonding. The inside of the tube has a anodized finish, which provides enough texture for a good bond. To make this joint even stronger, one could use the appropriate loctite primer and a cylindrical bonding loctite like 603 or 680.

Cliff

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05-09-2011 09:17 PM  7 years agoPost 11
TattooArtist

rrVeteran

Chestnut Ridge NY

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epoxy
How About just using epoxy instead.
wont it be stronger

Team Gaui/Empire Hobbies ,RcRcc,

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05-09-2011 10:43 PM  7 years agoPost 12
rcnut

rrElite Veteran

Rockford, Illinois

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Yes epoxy would be stronger, but Cliff hit the nail on the head. Its about creating a stronger bond. By roughing up the inside of the tube, it will give any type glue a better bonding/holding point.

Thunder Tiger came out with a 50 size upgrade for their 30 size heli. The boom was powder coated and at that time I didn't pay any attention to it. And as luck would have it...the first several flights were no problems, well until the oil from the glow fuel worked in-between the boom and the plastic grip.

During inverted hovering practice, the boom slipped into the body (belt driven tail) causing the tail to stop spinning! I learned very quickly how to land on the rotor head. To solve this problem, I took some 320 grit sand paper and scuffed the outside of the boom, just the area that is inside of the boom clamp.

This broke the glossy finish on the section of the boom that held the belt tension. It created more holding power. Funny thing is X-Cell had this problem with their plastic boom grips and super smooth carbon fiber booms. I used to make a scratch mark on the boom to see how far it would slip out!

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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05-10-2011 02:35 PM  7 years agoPost 13
CHiatt

rrApprentice

Winter Garden, FL

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Depends on the epoxy...
For the tube drive ends to be 'straight' in the tube, the tolerances are pretty close. This leaves a very thin bond line, it would take a really thin epoxy to get a decent bond. Loctite is the better choice for this application.

C

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