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Home✈️Aircraft🚁HelicopterBeginners Corner › Violent Shaking - What causes it?
05-22-2007 11:16 PM  13 years ago
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carpetman

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Bradford, England

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Violent Shaking - What causes it?
A really wierd and scary thing happened yesterday with my new ish raptor 50 Titan. Just going for a quick fly in the early evening. Got her hovering at about 3 foot ( im still learning so i still had training undercarrage on) and it began shaking really violentley so i put it down asap. It snapped the header tank mount just under the allen bolt.

What could cause this violent shaking?

The head speed was turned up the day before and flew all day with no problems (turning up the head speed was done to stop the undercarrage resonating although this wasn't violent - nothing like what happened yesterday)

The engine's had about 1 gallon through now and sounded like it was running as normal.

What u all think?
sharp knife, clear concience!
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05-22-2007 11:52 PM  13 years ago
orlee008

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Miami, FL USA

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blade tracking?
blades to tight?
dampeners not greased enough?
blades weighed and c.g. balanced correctly?
tooo rich?
bent main shaft or spindle from a hard landing? it happens quite a bit.
play in the linkages on the head?

just some things to look into....

orlee
Flying in Miami, FL (Kendall Area)
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05-23-2007 12:05 AM  13 years ago
rudyy

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E. Amherst, NY

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If you say everything is new, then I would eliminate the bent shaft possibility. Probably your headspeed is not high enough.

Rudy
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05-23-2007 12:48 AM  13 years ago
jschenck

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La Vista, NE.

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This sounds like the blades went out of track. That'll cause it to just about shake the tail boom off. What head speed are you running? I've had problems just like you described when the headspeed was way too high. Also, what gyro/servo are you running and what gain value. i had a violent shake earlier this year that turned out to be a gyro running at 100%.. sometimes it'd be fine but if the gyro got upset it'd just about tear the tail off.. not the typical high gain wag.

other than that, make sure there is NO play in the collective tray, collective servo or cyclic servos. gently rotate the grips back and forth looking for play in the system anywhere.

make sure the thrust bearings are assembled correctly in the grips. Check the screw that holds the ball link in the grips, one or both may be bent. Also, as mentioned your spindle is may be bent now if it wasn't already.
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05-23-2007 01:22 AM  13 years ago
Bryguy17

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Fullerton, San Luis Obispo CA

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also, if it was a ramping up effect, it may be the training gear resonating to the frequency on a much smaller vibration. i know that happened on my brother's raptor 50. worked fine without the trainers, but it shook like mad when they were onSLO Flyers
TREX SA with amazing figure 8 action!
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05-23-2007 01:50 AM  13 years ago
himaxkeith

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Atlantic City NJ. USA

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im with bryguy if its a new machine the most likly cause of vibration is hormonic vibration from the gear and the blades have sombody fly it for you with the training gear off if you not comfortable to fly it your self and do a good inspection if something loosened up including the flybar for shifting
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05-23-2007 01:51 AM  13 years ago
tchavei

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Portugal

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I agree with Bryguy17. I started out with a Freya back then and somehow I managed to achieve the perfect headspeed that would completely synch with my training gear... did you ever saw a 90 sized shaking so bad it was about to explode?

A quick fix is to cut the training gear legs each one to diferent sizes. That will help resonance alot

Tony

--------------------
"Perfection and patience usually walk side by side..."
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05-23-2007 02:28 AM  13 years ago
NORTHERNLIGHTS

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Riverview FL

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up the blade rpm a little it is resonance caused by the training gear. Adjust it up till it goes away usually about 100rpm if no govenor up your throttle curve a pinch in the 1/2 to 3/4 rangeB.O.A.T. Break Out Another Thousand!
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05-23-2007 02:46 AM  13 years ago
airboss

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OC ,california

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$$$$
my wife will shake me violently when she wants money.
Urukay HPS3 KSE 700 HPS3
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05-23-2007 03:27 AM  13 years ago
classic

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All over the place!

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He flew the whole day before with no problems,
Welcome to Raptor my son.

Just joKin'!
Its an ok heli
Which is worse, ignorance or apathy? I don't know and I don't care!
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05-23-2007 03:48 PM  13 years ago
cupra

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leicester uk

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if your on a training undercarriage try to shorten the legs by about 2inchs by cutting them down
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05-25-2007 12:08 AM  13 years ago
hollycopter

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england uk

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it could be a lack of alcohol i shake violently without it (hic) flying rocks wahhoo
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05-25-2007 05:01 PM  13 years ago
carpetman

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Bradford, England

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Thanks for that hollycopter lol! i 'll have to try it after a couple of cans of special brew!sharp knife, clear concience!
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05-25-2007 05:04 PM  13 years ago
carpetman

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Bradford, England

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Oh for the sensible ones out there, I had it checked out by the shop and they tightened up the main blade grips and generally went over all the linkages etc and she's back to normal now and flying like a dream!

going flying tonight and can't wait yippee!
sharp knife, clear concience!
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05-25-2007 08:54 PM  13 years ago
vermontelectric

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Vermont, USA

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I had the same shaking with my 50. took off the training gear and it went away completely.Steve Roberts
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05-26-2007 12:09 AM  13 years ago
carpetman

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Bradford, England

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Yeh I still get a little vibration on the training gear but this is nothing like I was getting - I think the main cause was that the main blades had worked themselves a little slack.

Can't wait to get them training gear off tho! I flew tonight but it was a little breezy to try it!

Hopefully a couple more flights and i'll av em off!
sharp knife, clear concience!
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05-26-2007 01:01 AM  13 years ago
garaptor

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Atlanta,Ga,usa

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Do it soon. I flew too long with a hulahoop and when I finally gave it up it was great! If you can bring it to a stable hover and land , its time to go without it. That landing gear seemed so tiny, I just knew it would tip over- but its much more forgiving than you think.And it will fly so much more cleanly without it.
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