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T-REX 450 › 1st crash wasn't from flying...
09-10-2007 06:00 AM  10 years agoPost 1
Dave_E

rrApprentice

Stanwood, WA

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Got the bird to hover 4 different times this morning as I was adjusting, finding out how things work. It's sitting on the workbench with the battery plugged in, throtle hold on and I switched throtle hold off to check swash position and she spooled up all the way, flopped off the workbench, hit the wooden floor, just disinegrated the 325 PRO blades. Somehow the freekin flight switch (idle up) got switched on. Learning mistake. The wife comes down, knows I'm upset, helps sweep up all the splinters and sees red on the floor and asked is that from me, so I do a check...nope not me, it was red from the red/white blades.

Obviously the blades are gone, the flybar is ever so slightly tweeked but the crown on top of the mainshaft has a very visible warble to it when you spin the blades very slow. Is my main shaft bent? Balanced the black & yellow blades that came with the kit, tracking is still good. What are the common replace items in a crash?

Dave

CHECK 6

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09-10-2007 06:25 AM  10 years agoPost 2
RICHW

rrVeteran

Cupertino, CA

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If the button on top did not wiggle, THAT would mean your shaft was bent. Align buttons wiggle right out of the box (bag).

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09-10-2007 07:39 AM  10 years agoPost 3
jimboflies

rrElite Veteran

Beaumont, Texas;

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Spindle(Feathering shaft), main shaft, fly-bar , tail boom , main bearings , tail shaft ,and of course main blades!!

EP8 EX twinring frame
Quick of Japan
EP8v2 EX
EP9

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09-10-2007 07:43 AM  10 years agoPost 4
Heli-on

rrVeteran

Southern Cali, CA - USA

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I'm in the learning stages myself. I know enough that I shouldn't be messing around with a live one. So, mine's still in pieces, as I gather up all the knowledge I can to prevent incidents like what happened to you. Thanks for sharing. I'd recommend you do your learning on a cheaper, less dangerous machine - at least for the fundamentals. You could have really hurt yourself, yes these are not toys and CAN inflict lethal injuries. For the record, the 'button' on top of the main rotor does not wobble in the slighest way on mine. I also know enough that you probably did bend your main shaft.

-Gregg B.

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09-10-2007 10:40 AM  10 years agoPost 5
Antlers

rrNovice

UK

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Its easier and very much safer to check setup using a 4.5 nicad plugged into the RX but its important to disconnect the ESC as apparently having both plugged in can damage the ESC, forgot once but luckily there were no problems.

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09-10-2007 12:48 PM  10 years agoPost 6
TomRex

rrElite Veteran

West Palm Beach Join Date: 12-28-2005

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Dave,
I once had a desktop crash myself. Embarrassing? Not really, the lesson I learned was to loosten the pinion set screw when doing stuff like that. Your lucky your Tx wasn't under the blades like mine was! Scarry? Yes.

Ignorance is the absence of facts.Stupid is lacking the intellectual capacity to comprehend the fact

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09-10-2007 03:45 PM  10 years agoPost 7
SSN Pru

rrElite Veteran

Taxachusetts

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THAT would mean your shaft was bent. Align buttons wiggle right out of the box (bag).
nice advice. YOUR head button wiggles out of the box, NOT EVERYONES.

DAVE_E
Balanced the black & yellow blades that came with the kit, tracking is still good.
STOP. Throw those blades away. They are only good for stirring paint and hanging on your wall. They are too flexible and will cause you trouble. you are better off getting a few sets of Pro 325 Woodies if you are learning. They are cheap enough.

unplug one wire from your motor if you are working on the bird on the bench. with one wire unplugged, the motor may turn a smidge and then stop as the ESC figures out that the motor is not plugged in correctly.

This is a safe way to insure that this accident doesnt happen again.

if your head button is wiggling, then your main shaft is bent.

the flybar can be bent back to straight with a bit of patience and work fine. you should replace your main shaft and spindle.

you can check the straightness of both by removing them and rolling them on a flat surface. a countertop usually suffices.

Stupidity can be cured. Ignorance is for life!

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09-10-2007 04:05 PM  10 years agoPost 8
Two Left Thumbs

rrKey Veteran

Houston, Texas - USA

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Tough breaks Dave_E, but at least there was no human blood (just Trex blood).

I did something similar when I built my 450. I wanted to spool it up, just a little, to make sure it was rotating in the correct direction. I read the stories, and removed the main blades.

Nudged the stick just a little, and the TAIL blades pivoted the heli and the tail smacked my tool box, and broke both blades at the root.

I felt really dumb, and scared myself too, those tail blades are sharp.

I know it is brand new and you feel bad about replacing parts, but I would replace the flybar, spindle, and main shaft. If you want to try to save the fly bar, remove it, because it is difficult to tell if it is bent once installed.

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T-REX 450 › 1st crash wasn't from flying...
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