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HomeAircraftHelicopterThunder TigerOther › I Need Help! R30 v2 Has the shakes
10-15-2005 11:29 PM  12 years agoPost 1
CobraHockey 28

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United States

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Hi guys. I'm new to helis. I have a raptor 30v2 with less than one gallon through it. For the first few tanks it flew very smoothly but within the last two days it has been shaking violently at spool up and at spool down. It has only done this once in the air and it ussually occurs at medium to low head speeds on the ground when taking off and landing. I have lubed the head dampeners, the spindle, mainshaft, and flybar are straight. What could the problem be? Should i buy a blade balancer and rebalance the blades?

Raptor 30v2 w/ OS 37, GY 401, and Futaba 7c

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10-15-2005 11:42 PM  12 years agoPost 2
BarracudaHockey

rrMaster

Jacksonville FL

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When you say the spindle is straight, have you rolled it on glass or taken a blade off and spun it with a hex driver and watched the tip of the other blade?

Andy
AMA 77227
http://www.jaxrc.com

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10-15-2005 11:44 PM  12 years agoPost 3
CobraHockey 28

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United States

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yes i have taken the spindle out and rolled it over a glass table to make sure it is straight.

Raptor 30v2 w/ OS 37, GY 401, and Futaba 7c

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10-15-2005 11:44 PM  12 years agoPost 4
A. Bundy

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Aurora,IL. 30W/SW of Chicago

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Make sure both blades are equally tight in the grips.

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10-15-2005 11:46 PM  12 years agoPost 5
CobraHockey 28

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United States

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How tight should the blades be in the grips? They are both snug, but with some force I can move them. Also, i still have training gear on my heli, could this be responsible for some of the shaking?

Raptor 30v2 w/ OS 37, GY 401, and Futaba 7c

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10-16-2005 12:01 AM  12 years agoPost 6
Butch

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New York

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"Should i buy a blade balancer and rebalance the blades?"
Always good to do!

Are the locknuts on the main-blade bolts seated in the hex sockets under the grips? Are both blades equally tightened?

Spindles ,shafts, flybars can be checked on a super flat /machined surface, or a thick glass pane, although from your description, I dont think the problem is in that area. Just thoughts...I am no pro

The Whirlybug Bit Me!

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10-16-2005 01:44 AM  12 years agoPost 7
BarracudaHockey

rrMaster

Jacksonville FL

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Yes, training gear will resonate and cause the wobbles.

Andy
AMA 77227
http://www.jaxrc.com

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10-16-2005 05:33 AM  12 years agoPost 8
CobraHockey 28

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United States

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Ok, I think I am about ready to ditch the training gear so i will try taking it off tommorow. Hopefully that solves the problem.

Raptor 30v2 w/ OS 37, GY 401, and Futaba 7c

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10-16-2005 06:56 PM  12 years agoPost 9
CobraHockey 28

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United States

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I took off the training gear and now the problem is worse. It was wobbling so bad at low headspeeds (when it was on the ground) that it started hopping side to side. Should I check the thrust bearings in the rotor head? When I assembled my heli i couldn't tell the difference between the two sides of the bearing.

Raptor 30v2 w/ OS 37, GY 401, and Futaba 7c

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10-16-2005 07:54 PM  12 years agoPost 10
pudge

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Kentucky

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check your blade tracking, and invest in a good blade balancer, sounds like you are out of balance or way out of track.

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10-16-2005 08:38 PM  12 years agoPost 11
Butch

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New York

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Thrust bearing "side" with larger hole faces hub.
Side with smaller hole faces blade.

The outside diameters of both bearing sides are the same. The inner holes differ.

Dont forget the lube!(Dampers too)

The Whirlybug Bit Me!

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10-16-2005 09:15 PM  12 years agoPost 12
CobraHockey 28

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United States

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I checked the blade balance, it was okay. The dampers are lubed. The thrust bearings are probably the problem. I will take apart the rotor head and check the thrust bearings in the middle of the week. I don't have time to fix it now.

Raptor 30v2 w/ OS 37, GY 401, and Futaba 7c

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10-17-2005 02:51 PM  12 years agoPost 13
BarracudaHockey

rrMaster

Jacksonville FL

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http://www.raptortechnique.com

Click on the build guide, find the rotor head page and follow his instructions step by step for building up the grips.

Andy
AMA 77227
http://www.jaxrc.com

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10-17-2005 10:14 PM  12 years agoPost 14
CobraHockey 28

rrNovice

United States

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OK I think I found the problem . The thrust bearings were installed wrong. When I built the heli, I accidentley installed both thrust bearings with the larger inner diameter on one side of the rotor, and both thrust bearings with the small inner diameter on the other side of the rotor. . I am assembling my heli now, I will report back with the results. Thanks alot for your help guys.

Edit: I just test flied it. The thrust bearings weren't the problem. It flew very stable for about half a tank then the wobbles came back. I will probably take it to the lhs and see if someone there can help me out.

Raptor 30v2 w/ OS 37, GY 401, and Futaba 7c

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10-18-2005 02:14 PM  12 years agoPost 15
BarracudaHockey

rrMaster

Jacksonville FL

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Check your spindle again and make sure the shaking didnt bend it.

Also pull the screws holding the balls to the blade grips and make sure those didn't get bent.

Andy
AMA 77227
http://www.jaxrc.com

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10-18-2005 10:52 PM  12 years agoPost 16
CobraHockey 28

rrNovice

United States

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The spindle has a very small bend in it. Also, the bearing that goes into the end of the rotor grip facing the blade (part 12 on pg 17 of the manuel) was stuck to the spindle. The bearing could spin freely but the inner part was seized to the spindle and i had to use a heat gun and some force to remove it. I will see if the lhs has any spindles in stock and hopefully replace it within the next day or two.

I also checked the screws that the linkage balls attach to on the grip, those looked ok.

Raptor 30v2 w/ OS 37, GY 401, and Futaba 7c

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