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Century Radikal E640 - Swift 16 NX
› 3D Pro strange vibration
08-12-2007 07:49 PM  10 years agoPost 1
gaanel

rrApprentice

Greenville, SC

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I have just rebuilt my 3D Pro from a minor crash. Basically, all that happened was I hit the blades in the grass. This broke the head axle CNE201.
I went ahead and replaced the main shaft, head axle, blades, dampeners, and some other parts.
As I spool up all seems ok. The blades are in track, very minimal vibration, etc. Then right at the moment of lift off, the heli acts as if one blade is very out of balance. Almost to the point of destroying itself. I have just about disassembled the entire heli and put it back together again. I checked the main shaft for straightness, I ran up the throttle without the main blades and had minimal vibration. I dynamically and statically balanced the main blades, as well as trying two extra sets of blades that I had. I changed the blade grips, etc. Everything looks great.
Any ideas????

Thanks for the help.
Gary

Member of the "Light Side"

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08-12-2007 09:13 PM  10 years agoPost 2
geeo

rrApprentice

Edinburgh, Scotland

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Check the rotor hub.

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08-12-2007 09:30 PM  10 years agoPost 3
Pistol Pete

rrProfessor

Seffner, FL

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and some other parts.
seesaw?

~~Enjoying the hobby one flight at a time~~

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08-13-2007 05:58 AM  10 years agoPost 4
jtspin

rrNovice

Reno, NV

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Make sure there's nothing binding in the head. I had the same problem and it was the flybar seesaw (as the post above mentioned). It wouldn't easily seesaw up and down. Another symptom is that it had no vibrations with the blades on and tied down, but unconstrained, as soon as it would lift off it would go crazy. A higher head speed would make it better, but there was still some vibration.

-JT

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Century Radikal E640 - Swift 16 NX
› 3D Pro strange vibration
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