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Other › It lasted 10 seconds.....then Kaaboom.
02-12-2006 09:04 PM  12 years agoPost 1
raptor_rick

rrNovice

Knoxville, TN

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Im interested in feedback on what is up with this ill handling bird....I have been flying a raptor for almost 2 years but I barely got this T-Rex off the ground before I crashed it. The head felt sloppy wobbly to me ...could that have been the cause or is this darn thing just that sensitive? I had checked the head speed just prior to lift off and it was around 2400 ....i gave it a little more pitch...and it just jumped to the right..back left and ..Kaboom!...$100 worth of parts to order. By the way my kit is/was a 450XL...not the SE version. I have HS56s...pcm...CC35...lipo 2100...Align 430L....Any ideas would be appreciated. Id like to not crash this thing again!

Thanks

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02-12-2006 09:18 PM  12 years agoPost 2
Kramer

rrApprentice

LaPorte,In.

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any expo in the cyclic?do you have any weights on the flybar?

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02-12-2006 09:20 PM  12 years agoPost 3
kookboy

rrKey Veteran

Vancouver, BC

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So many things could cause that.

If you have it all 'stock', then it's a VERY twitchy heli at first.

... But honey it was only $$$

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02-12-2006 09:21 PM  12 years agoPost 4
raptor_rick

rrNovice

Knoxville, TN

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Yes...30%....and I had two wheel collars - one each side.

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02-12-2006 09:22 PM  12 years agoPost 5
Kramer

rrApprentice

LaPorte,In.

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possible tight swash and or ball links

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02-12-2006 09:24 PM  12 years agoPost 6
kookboy

rrKey Veteran

Vancouver, BC

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Was your swash movement correct ? left/right pitch angles? I had mine reversed when I first put it together and that gave me a huge scare.
Cyclic was going in the opposite direction. Don't mean to offend either. It was a simple mistake on my part. Same outcome as your or similar.

Like Kramer said, I'd check the ball links and swash as well.

... But honey it was only $$$

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02-12-2006 09:26 PM  12 years agoPost 7
leslie

rrKey Veteran

Hollis, NH - USA

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Hi all,

I had a similar problem with my xl build. twitchy as all get out. I went through and reamed every ball link until totally smooth. Then added some expo on the radio.

She now handles much better, hoving in the basement. It's sensitive but managable.

Cheers,
Leslie

Protecting those who protect us

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02-12-2006 09:31 PM  12 years agoPost 8
raptor_rick

rrNovice

Knoxville, TN

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Im pretty sure everything was working ok...I had slide it around on the basement floor - left - right - forward back....checking head speed...setting up my throttle and pitch curves. I was ready for a nice flight ...but it sure did surprise me.

Obviously Im going to be buying alot of new parts...what are the best parts to buy for the stock XL to tame this beast? Or maybe I just need to trash this thing and stick to my rappys. I was really looking forward to flying something inside while it was cold.

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02-12-2006 09:39 PM  12 years agoPost 9
kookboy

rrKey Veteran

Vancouver, BC

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I was really looking forward to flying something inside while it was cold.
The Rex is a ruff heli to fly indoors. At least anything smaller than a small gym.

It's quite possible that the rotor wash caused the Rex to wander off.

... But honey it was only $$$

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02-12-2006 09:42 PM  12 years agoPost 10
Kramer

rrApprentice

LaPorte,In.

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don't trash it,put it back together ,test and trim it outside or in a large indoor building ,you will get it,just take your time

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02-12-2006 09:44 PM  12 years agoPost 11
Kramer

rrApprentice

LaPorte,In.

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I have been flying mine for a year now and still have some trouble in tight places

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02-12-2006 09:46 PM  12 years agoPost 12
Kramer

rrApprentice

LaPorte,In.

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If you broke the skids,get the metal ones

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02-12-2006 10:42 PM  12 years agoPost 13
Helifool

rrVeteran

Rochester New York

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Sorry to here about your mishap. I know this doesnt help right now, but I always put on a simple training gear for all my helis first flights even though I know how to fly well. It can save you in a case where the heli tries to wander off. It definately saved me a couple times.

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02-12-2006 11:54 PM  12 years agoPost 14
kookboy

rrKey Veteran

Vancouver, BC

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Or grab a set of Gorilla gear landing struts.

You can't break them.

Metal/Align's will break.

... But honey it was only $$$

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02-13-2006 12:05 AM  12 years agoPost 15
Santiago P

rrProfessor

South West, Ohio

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possible tight swash and or ball links
Yep!
T-Rex's are twitchy, but manageable. Tight balls will put you on the ground so quick you won't know what hit you. We are talking about ball links, right?

Also:

Even at 2400rpm, a TRex is not a happy machine in small places. What makes them so much fun, makes them a handfull if you are not used to them. Be carefull if you go and fly it outside when cold, even after properly sizing the ball links, the links do shrink a bit and become grabby, making it almost imposible to control.


Santiago

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02-13-2006 12:15 AM  12 years agoPost 16
kookboy

rrKey Veteran

Vancouver, BC

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Yeah we're talking about the balls.

That's what it takes to fly the Rex.

... But honey it was only $$$

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02-13-2006 12:28 AM  12 years agoPost 17
Santiago P

rrProfessor

South West, Ohio

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Yeah we're talking about the balls.

I thought so.
I did my first flips indoor with mine yesterday. My 1st attemp was a month ago, with only 5 minutes of flying it, I ended finding the wall/net very quickly. 10 flights later, and with much free-er balls, I went for it yesterday and did not drift more that a couple of feet. By no means I have mastered this small beast, but I recognized the "balls" issue a bit better.

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02-13-2006 12:30 AM  12 years agoPost 18
Grant H

rrKey Veteran

Madison, WI

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Did you do anything to losen your ball links?

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02-13-2006 01:25 AM  12 years agoPost 19
raptor_rick

rrNovice

Knoxville, TN

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No..I didnt do anything to the ball links. Maybe it was "sticky". Just how loose do they need to be? Out of all the things Ive read about, that could have been my reason for the sudden crash.

Noone is talking about the loose head....is this really not an issue? I mean two o-rings and a spacer (on each side) and it still has at least 1/8 play in the grips. I did find that the feathering spindle was not tapped deep enough (prior to my crash) for the screws and that helped my sloppy head but its still seems way too loose to me.

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02-13-2006 01:36 AM  12 years agoPost 20
JuanRodriguez

rrProfessor

The Villages, Florida

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raptor_rick,
Firstly, I do NOT own a T-Rex but know several that do....

Tight ball links is a SERIOUS problem and most likely the cause of your premature crash.....

On "conventional" helis, we use the JR ball link sizing tool to make the links rotate silky smooth on balls. These little micros are no different. I have personally seen an experienced flyer trying to fly a T-Rex whose "ball links" have not been tweaked in a confined space. The T-Rex is a handfull, to say the least.....

Once the ball links are tweaked, it's like flying a different machine.....

Take this info for what it's worth....

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