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HelicopterScale Model RC Helicopters › Roban 700 AS350 Mechanics Vibration Fix's
TailKiller

Senior Heliman

Panama City, FL

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Stan.. Don't get spooked, I'm sure I made several mistakes. It gave way while at or around zero pitch while the mech's were on the bench. I've done it a hundred times.. I didnt see or hear any unusual vibrations so Im guessing the head was already fatigued and it was time to let go.. I just have never be able to get this 3 blade to flt right. One day it's fine and the nextit wobbles and the next day I pull the mechs and start from scratch again. I tried it with a 2 blade goblin head some time back and it was great but I wanted it scale so I tried again.
With the battery the way it is now and the rear seats removed along with the wood hump in the back of the cabin it is just over 17 pounds.
Oh.. I had several violent pitch pumps during test flights so that may be the reason it gave way. Anyway I'm sure you will have better luck then me... no one can have worst then me...lol

,Dennis
http://pcrcheliclub.com/
700 Astar Super Scale T-600 Bell 206 Trex 600 Naza H DX8

01-29-2017 07:48 PM
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tintmaster

Key Veteran

Wichita, Ks. U.S.A.

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"Anyway I'm sure you will have better luck then me... no one can have worst then me...lol"

Yeah right, you don't know me!! I'm not called Farmer Brown for nothing!!!

Just call me Farmer Brown. 'Cause I know how to really plant 'em

01-29-2017 09:44 PM
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Mojave

Elite Veteran

Palos Verdes, Ca. USA

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Bad news on the head... I have never seen a Diamond head break like this unless it crashed, then that's where the failure point would be. Take a look with a magnifying glass at the area where the breaks occurred. There should be a very small radius machined where those 2 sections of the spindle meet. If they didn't machine a small radius there, then that's where the stress riser finally cracked the spindle. All it takes is one spindle to break, cause a bad vibe, then the rest will follow suit...
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

01-29-2017 11:52 PM
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TailKiller

Senior Heliman

Panama City, FL

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Yeah it snapped right at the piont where the spindle tappers down for the grip. I didn't get to fly this weekend but I really think I got it this time. Ground test look real good.

,Dennis
http://pcrcheliclub.com/
700 Astar Super Scale T-600 Bell 206 Trex 600 Naza H DX8

01-31-2017 01:16 AM
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HelicopterScale Model RC Helicopters › Roban 700 AS350 Mechanics Vibration Fix's
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