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Thunder Tiger
Raptor E325 › Mini titan problem
07-14-2008 12:51 AM  9 years agoPost 1
b morris

rrNovice

wexford Ireland

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Hi guy,s i have a friend who has recently bought a mini titan.
This heli has never flown as it has just been built.
Yesturday we tried to lift off into hover and when the throttle stick reached a certain point the heli fell over very quickly on its left hand side-damage not too bad just main blades+flybar.
I DID NOT GET ENOUGH TIME TO STOP THIS VIOLENT REACTION.
Doe,s anyone have any idea what might cause this to happen?.
Your help would be appreciated-thanks.............

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07-14-2008 01:28 AM  9 years agoPost 2
cub2000

rrVeteran

Massachusetts

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Did you do a range check on the servos/RX vs. your transmitter before first flight? Sounds like a deadly glitch to me. Other than that, make sure that it's not a dead servo that caused the sudden side landing.

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07-16-2008 04:21 AM  9 years agoPost 3
Efrog

rrApprentice

Colorful Colorado

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Check your mixing

Check your CCPM mixing. This sounds like one servo is not moving correctly. unplug the motor and move the servos through their full range while moving the throttle up to full. I think you will find that one of the servos is not moving in sync with the others.

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07-16-2008 04:30 AM  9 years agoPost 4
toolman18

rrElite Veteran

Portland Tx

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What gyro? If it is reversed it will shake violently. It could fall over.

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07-16-2008 10:54 AM  9 years agoPost 5
hawkeye4077

rrApprentice

Planet earth

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main blades+flybar
you better check the main shaft too.
is this your first time to fly a heli?
if so you better find some one to help you, as mentioned it could be ccpm setup or just triming.

Gerard Dagher

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07-16-2008 03:31 PM  9 years agoPost 6
TJinGuy

rrProfessor

Socorro, NM - USA

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I NEVER try to hover a new heli without training gear. Just thought I would point that out cause it will save you a lot of time, money and heart ache.

---
I had my gyro set backwards one time on the Mini and I didn't have TG on it. When it got light on the skids, all hell broke loose and piro'd so freaking fast it was a blur. I set it down straight but there was still $25 worth of damage. If I would have had TG on it, the damage would have been null. So far I have crashed 2 helis due to setup issues, both would have been prevented by using TG.

- Chris

Team New Mexico
TJinTech

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07-16-2008 04:02 PM  9 years agoPost 7
spindoctor

rrNovice

Chapel Hill, NC

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Intial flight tests

Sorry to hear about your friend's crash. You have not really given up enough of the story for anyone here to guess the root cause, but I thought I'd chip in with a little advice:

Watch the rotor: I know you already checked the swashplate direction and interaction. When you first spool up, keep your eyes on the rotor, see if it smoothly accellerates, that it's level and vibration free (unbalenced rotors could cause a tip over).

During spool-up, you should still be able to give carefull cyclic commands and see the rotor react (before the rotor hits flying speed). Some control issues really don't show up until parts are in motion.

Try to spool up on a smooth surface. Grass can catch a skid and cause the heli to fight against the snag and BOOM!. Also, a smooth surface will allow you to catch gyro, trim, balance and vibration issued before you get the headspeed to a flying RPM. Spool up slowly.

I hope this helps next time.

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07-16-2008 05:17 PM  9 years agoPost 8
TJinGuy

rrProfessor

Socorro, NM - USA

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Thinking more about it, maybe he has a servo reversed. That would make a pitch adjustment look like an aileron adjustment.

- Chris

Team New Mexico
TJinTech

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07-20-2008 12:06 AM  9 years agoPost 9
b morris

rrNovice

wexford Ireland

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problem found

HI GUYS-many thanks for your help it turns out 1 servo was stalling at centre stick on throttle.EFROG YOU WERE SPOT ON IN YOUR DIAGNOSIS.
MANY THANKS AGAIN

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07-20-2008 04:17 AM  9 years agoPost 10
Efrog

rrApprentice

Colorful Colorado

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Good luck

Very glad that I could help. Good luck with your Mini Titan. I love mine. Don

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Raptor E325 › Mini titan problem
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