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skytrooper

Heliman

South-Africa

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What is the most common cause of a tailfin vibration on a t-rex 800 trekker, it's seems to be fine in forward flight just when i hover i have this vibration, should i lower my throttle curve perhaps, or reduce my tail gain on vstabi ? Nothing is bent.

Throttling up for the first time, i can't wait....

07-04-2016 06:21 PM
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Sparkhead

Key Veteran

Melbourne Australia

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I'm led to believe that if you have the bearings evenly spaced along the torque tube you can end up with some high frequency vibes which may show up on the tail fin. Might be worth a look.


Mick.

Robbe & Futaba.

07-05-2016 02:26 PM
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rcflyerheli

Key Veteran

Granbury, TX USA

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Also, check your tailshaft for side to side play. I found that if the tailshaft can move, the force generated when the blades move outward away from center will tighten up the backlash on the unbrella gears and make them run rough.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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07-05-2016 03:39 PM
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Rojoalfa

Senior Heliman

Punta de Mata, Monagas-Venezuela

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/
/

First... Check tail blades... Other Brand ...

/

Saludos cordiales,

07-06-2016 03:19 PM
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Richardmid1

rrProfessor

Leeds, England

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Check tail blade balance first.

60% of the time, it works every time!

07-07-2016 10:35 AM
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skytrooper

Heliman

South-Africa

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Thank you for the advice everyone, i was away for a week work related, am now back to do the troubleshoot again and will try your suggestions, i will update with my results.

Throttling up for the first time, i can't wait....

07-09-2016 09:04 AM
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skytrooper

Heliman

South-Africa

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What do you know ! i balanced the tailblades thanks it was out of balance but the vibes was still there, the mainblades is out of track ! It being my first very big heli i was not thinking about tracking as those blades spinning so fast was not something i'd like to come close to, but i did today and saw it was out of track, is the tried and trusted way of sticking tape on one blade spinning it up still the best way to get the tracking done ? ... man those blades is NOT something i want to mess with 1 meter away from me in the air, i did however see it shows out of track on the ground spooling up too, here's the vid, sorry for the quality, not sure what setting on the samsung i need to change to get the blades to look nice:

Watch at YouTube

Throttling up for the first time, i can't wait....

07-10-2016 04:03 PM
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rcflyerheli

Key Veteran

Granbury, TX USA

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I'll tell you a blade setup trick I learned a long time ago when I was first getting started. I've been using this method for six years now, and have not ever had a blade out of track from the getgo.

It does rely on an accurate mechanical setting to get the swash completely level at mid stick. If the swash isn't level, then you will not ever get your blades to track properly, so do everything to make sure the swash is level at mid stick.

With the radio powered up and the swash at mid stick, take either an appropriate sized hex tool or a prop balancer rod and cone tool and place it into your grip's blade holes. I like the prop balancer and cones, as they accurately center the rod in the grip holes from 500 sized heads to at least my 700 sized.

Now all you have to do is to insure that the rod is parallel with the main shaft. Adjust the grip to swash links as necessary to get it parallel. It is amazing how well the eye can see an out of parallel situation.

Once it is set parallel, now rotate the head to the other grip and do the same. One other thing, whichever FBL unit you are using, make sure it is in setup mode rather in gyro mode, as this keeps things still for the setup. FB setups are the same and work equally as well.

All you should have to do is to balance your blades.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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07-10-2016 05:59 PM
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skytrooper

Heliman

South-Africa

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Been flying heli's for over 10 years, totally forgot about this method (it's because i fly more than build, (but by saying that, i only fly once or twice a month... and NO 3D

Thanks again, i think this method is most likely the most ideal method to use on the 800, now i can get it in track before checking in flight, just need to dial out my pitch curve on the tx i guess, come to think of it the kbar does not let you set the heli up for 50% midstick... i will need to adjust something in there, but temporary... just can't recall what and i don't want to re-calibrate the whole helicopter in the vstabi software.

Throttling up for the first time, i can't wait....

07-12-2016 06:18 PM
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