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HomeAircraftHelicopterAlignOther › Trex 700 Boom Strike
04-26-2009 11:27 PM  9 years agoPost 1
wakebum187

rrApprentice

west linn, Oregon

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I know that I am posting this in the main forum but I just wanted people to see. Trex 700 Nitro did a boom strike I didn’t even think this was possible? What should I do?
Using 710 SB

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04-26-2009 11:34 PM  9 years agoPost 2
baddynergy

rrElite Veteran

sierra madre, ca- usa

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Check your dampers, fix it, fly it and crash it again..
Any heli can boom strike if the conditions are right.

**Unattended children will be givin a shot of espresso and a puppy**

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04-26-2009 11:36 PM  9 years agoPost 3
merlin3

rrKey Veteran

dayton, ohio

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agreed, any heli can boomstrike, at least yours was saveable.

Justin - Team Horizon, Team Byron
2-700x, Trex 700n, small helis

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04-26-2009 11:39 PM  9 years agoPost 4
zaw

rrKey Veteran

Lebanon, NH - USA

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longer blades flexes more then shorter ones yeah?

ಠ_ಠ HBK2 built with inexpensive parts! ٩๏̯͡๏)۶ Gaui425

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04-26-2009 11:52 PM  9 years agoPost 5
TaleGunner

rrElite Veteran

Deer Park WA

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if dampers dont do it Maybe try 690s

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2

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04-27-2009 12:00 AM  9 years agoPost 6
JAGNZ

rrProfessor

Auckland, New Zealand

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Headspeed? How many flights and how old are the dampeners? How tight were the blades in the grips? What maneuver were you doing when it struck, was it bogging at the time?


Jason Greenwood

www.3dheli.co.nz

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04-27-2009 12:13 AM  9 years agoPost 7
wakebum187

rrApprentice

west linn, Oregon

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the blades were locked down and 1850 head speed. and it's been flown 24-30 flights.

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04-27-2009 12:21 AM  9 years agoPost 8
baddynergy

rrElite Veteran

sierra madre, ca- usa

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What were you doing when it happened??

**Unattended children will be givin a shot of espresso and a puppy**

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04-27-2009 12:56 AM  9 years agoPost 9
Yug

rrMaster

UK. Herts

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Centripetal forces and head speed versus damper stiffness.

Vegetable rights and Peace

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04-27-2009 02:09 AM  9 years agoPost 10
Avant3D

rrNovice

Yardley, PA - BUCKS

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Loose blade grips combined with excessive head bogging can result to a boomstrike regardless how stiff the rotor assembly as a whole.

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04-27-2009 04:39 AM  9 years agoPost 11
Against Gravity

rrVeteran

Pottstown PA

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Boom strike
My new 700 had about 20+ flights on it and was in level forward flight, when it happened. Flying 710SB's tight in the grips, Rocket city ball links. about 80' up and BANG down it went.

Still can not figure out what went wrong, I know another guy who had the same thing happen to him ?????

There must be a reason this is happening, Any more thought's...

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04-27-2009 05:05 AM  9 years agoPost 12
Santiago P

rrProfessor

South West, Ohio

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If you were 3D-ing the heli hard, boom striking is not hard to do.

However, if the heli was straight and level and it boom strikes, something has to fail for it to happen.

2 weeks ago I had my hot Raptor50 out for a dust off, and when I switched to idle up to start the fun, one of the paddles shifted, burried the flybar and within a second the heli boom stroke. Hit hold as soon as I heard something was wrong but it was too late. It all happened at eye level 30ft in front, so it was easy to see the flybar shift and inmediate super wooble.

The explosion was phenomenal as well as the parts scatter. :
... all the dust came off too.

BTW, I have heard of a number of Trex 600 and 700 suddenly shedding parts or exploding in level flight for no apparent reason. Is a shame because after flying my buddy's 700, I was starting to want one.

$pit

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04-27-2009 05:06 AM  9 years agoPost 13
CrashMaster91

rrApprentice

Spokane, WA

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Was the other guy that had the boom strike running the carbon boom too?
Oddly enough, I was talking to an Align rep, and a good friend of mine, today. He said that the carbon boom flexes and may cause major vibration. He actually helped another friend from the field who's 700N was vibrating. Told him to take off the carbon boom and put the alumminum one on. Fixed the problem imediatly.
I would try the other boom and fly it again.

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04-27-2009 05:32 AM  9 years agoPost 14
Thomas Moore

rrApprentice

California

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maybe something was misALIGNed. on any heli its possible, but with the overkill amounts of pitch that the 700 has I think its more than possible.

Thomas Moore Team Avant Team Edge

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04-27-2009 05:35 AM  9 years agoPost 15
chopper_crazy

rrElite Veteran

Delphos, Ohio

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whatever it is, fix it and fly it harder

It's a complex, costly, glow powered anti-gravity machine!

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04-27-2009 08:42 AM  9 years agoPost 16
J2M

rrVeteran

UK

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It'd be useful to know what manouevre caused the boom strike but i think the advice to check the dampers is good.

Depending on the flying you do, I'd also suggest a higher headspeed with a little less pitch and cyclic throw. In combination, this will help to reduce disk deflection. My 700s are really sweet at 1950

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04-27-2009 03:58 PM  9 years agoPost 17
wakebum187

rrApprentice

west linn, Oregon

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When I had the boom Strike I was coming in hot backwards upside down and did a piro with cyclic input when BOOM! And blew the main gear but was able to land. So it was a combination of fast speed into hard cyclic maneuver.

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04-27-2009 04:17 PM  9 years agoPost 18
Flying Brian

rrElite Veteran

St. Clairsville, Ohio

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BTW, I have heard of a number of Trex 600 and 700 suddenly shedding parts or exploding in level flight for no apparent reason. Is a shame because after flying my buddy's 700, I was starting to want one.
Is this a common occourance on the 600-700 nitro or electric?

And is the cause from the boom flexing in most cases, or not?

"I just don't Listen" "

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04-27-2009 04:25 PM  9 years agoPost 19
USNAviationjay

rrElite Veteran

Houston Tx USA

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I would say no its not common at all.
Ive never seen a T700/600 Boom strike without strong provocation like a bad auto or extreme low headspeed bog during 3D.

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04-27-2009 04:51 PM  9 years agoPost 20
AreA51tje

rrApprentice

Murcia, Spain

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Don´t worry can happen ones in a while ....

Had one aswell two weekends ago found pieces of my tailboom about 100 metres away from the crash... just exploded in front of, very scary sight at first... could throw the heli in the trashcan all servos destroyed, chasis cracked, etc But allready replaced it for a new one

Regards, Dave

Crashed one

New one

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