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HomeAircraftHelicopterFuel-Helicopters New or Limited ActivityElyQ › Interesting test flight tonight. lol
06-02-2009 09:56 AM  9 years agoPost 1
RappyTappy

rrProfessor

Traveling the USA

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**found out was my fault for the issue, I'm losing it in my old age **

Went for a quick first flight tonight. So out at the desert start it up and engine was nice and smooth in the drivetrain and love the sound of the new MP2 SB I outfitted on the already broken in motor.

Initial spool up was smooth, vibration free and blades were tracking perfectly right off the bench.

Lifted off into a hover, good for about 4 seconds then a hum, then a really loud hum, then some erratic wagging of the tail and as I'm setting it down, it loses all tail control.

I laughed out loud and didn't know why, maybe feeling I cheated some kinda heli death, lol

Anyway, the tail case fractured in a very odd way. I was using a the hub, grips and blades that were already proven in flight before for testing purposes. Definitely very interesting. Still a cool little heli, felt nic for the short while I had it in the the air. Just wish I got a little more airtime for the first flight, oh well, tomorrow morning we try again.

-sorry for the kinda blurry pictures, my camera is finicky on close up stuff.

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06-02-2009 12:36 PM  9 years agoPost 2
Mapleleafs

rrVeteran

Ontario, Canada

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vibrations?

Vbar Trex 700N, Vbar MSH Protos 500, Vbar Logo 400

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06-02-2009 01:57 PM  9 years agoPost 3
jschenck

rrProfessor

La Vista, NE.

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that is an odd failure. Do you think the bearing got pressed in a bit cocked, cracking the case? Or do you think it's a bad casting?

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06-02-2009 02:29 PM  9 years agoPost 4
tucfaz

rrApprentice

Singapore

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That part of the tail case that houses the bearings are weak.. Hence, I try not to stretch the belt too tight which may cause stress on vibration. Mine broke during a crash thou..

This I must say is waste of material.. reinforce throughout, but leaving the critical portion vulnerable

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06-02-2009 02:53 PM  9 years agoPost 5
LONEWOLF2440

rrElite Veteran

MYRTLE BEACH S.C

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Be nice if they came out with a all metal tail

MIKADO LOGO 600 TREX 550

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06-02-2009 03:03 PM  9 years agoPost 6
tucfaz

rrApprentice

Singapore

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Be nice if they came out with a all metal tail
Actually there are already a few metal options for the tail casing.. Kasama is one of them..

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06-02-2009 04:32 PM  9 years agoPost 7
RappyTappy

rrProfessor

Traveling the USA

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I can't see how there would've been excessive vibration in the tail. The shaft was brand new and straight and the grips, hub and blades already had seen airtime on another airframe. Now that I think about it, the bearing was a bit snug to put in but I used a press to put it in as straight as I could.

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06-02-2009 04:34 PM  9 years agoPost 8
JEEPWORLD2002

rrKey Veteran

BLUEBELL PA USA

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i wanna say the shaft was slipping inside the inner race and heated up and made the plastic case weak and pull through ?? just a guess did the shaft have any rub marks ?

Trex600n Trex500 Mikado LoGo5003d// Hacker, CastleCreations,Ys 50, JR 7703d/8900, Radix

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06-02-2009 05:16 PM  9 years agoPost 9
Eco8gator

rrElite Veteran

Palm Beach, FL

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Dang man thats a pretty skimpy ammount of material for that rear bearing...

Hopefully they beef that up some but if not the Raptor Titan tail box is pretty solid. If the bearings fit I would just buy the plastic box and be done with it. Dont forget to put the metal yoke on as well...

C

Xera Motors
ProBar
Minicopter
Thunder Power

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06-02-2009 06:09 PM  9 years agoPost 10
RappyTappy

rrProfessor

Traveling the USA

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100% Completely my FAULT LOL
So today, new tail box, same hum and tail fin vibrating horribly. Check tracking and everthing was dead on.

SO I check the tail with the blades turning very slowing and hold onto the tip of the tail box and could feel massive vibration in the tail box.

SO I remove the tail blades, and what a moron, I mixed up my a spare 90mm blades with my 95's and so one was longer(and heavier) than the other, I'd say that would cause a vibe! LOL Amazing how easy it is to over look the small things.

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06-02-2009 07:36 PM  9 years agoPost 11
jschenck

rrProfessor

La Vista, NE.

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good you found it - I always recommend checking the balance on the tail blades. They spin at 9,000 RPM give or take so a little imbalance is not good.

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06-03-2009 02:07 AM  9 years agoPost 12
Mapleleafs

rrVeteran

Ontario, Canada

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HAHA....nice catch, glad to hear it in a way.

Vbar Trex 700N, Vbar MSH Protos 500, Vbar Logo 400

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06-03-2009 06:16 AM  9 years agoPost 13
pcw

rrNovice

chicago

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i had already gone thru tail troubles with vibes because of the stock bearings and tail case. i didnt like how the bearings felt new, but flew them anyhow. after a few flights the tail started vibrating.

the rear screw in the tail case actually preloads the bearings if you tighten it to much. i replaced the bearing with spare t450 mainshaft bearings, and used a small washer between the tail case half on the rear bolt. checked for loaded bearing with washer and everything was very smooth. before with the stock bearings and no washer tightening it to much made it drag and notchy bearings.

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06-05-2009 12:58 PM  9 years agoPost 14
IYKIST

rrKey Veteran

London united kingdom

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ElyQ copied Quick UKs metal tail box but did not think of using more material around the bearings which would eventually fail.

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06-08-2009 09:07 AM  9 years agoPost 15
400driver

rrApprentice

uk/ Spain

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Hi PCW,
Could you confirm which screw you tightened or replaced with a bearin
g..a picture or part number would be really helpful.
Also there is a Tip on the ElyQ website about buiding the tail slightly differently than from the instructions..
http://www.elyq.com/en/tips.html
cheers mark

More days at home would be nice!

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