trex 600 installed in md500e scale body

[CMRODELLI]

ive just installed my trex 600e in the align md 500 scale body and set it up per instruction manual and spooled it up everything seam to be fine until it got light on the skids and then began to shake violentley and cracked the ply mounting plate the airframe is bolted to, anyone out there have any ideas of what could be causing this violent shaking?

[TowPilot]

Hi,

Moved Thread
From:.....Main Forum - Helicopter Talk
To:.........Scale Helicopters Discussions About Scale Helis, compatibility and and projects

Regards,
Mike

[Richard F.]

resonance. The best thing you could have done was lift off. I would say replace your mianshaft, or check for vibration. If you do a google search on ground resonance you might find some vids of full size helis that this happens to also. Hope this helps.

[satsuma]

Resonance is bad on these helis if not built strong and the mechanics WELL SECURED at the doghouse, the fuselages are quite flexible around the tailboom to main fuz blend area and thats where the shakes begin, it then escalates rapidly to the mechanics moving at the top of the fuz, i went through this with my Trex 600 500E combo and completely sorted it by reinforcing the mounting plate, fixing the mechanics with a bracket to the doghouse AND glassing some carbon on the inside of the fuz where the boom sweeps into the rear fuselage area, about 1 hours work will transform this heli into a nice docile bird, any questions just ask.
Hope this helps.

[Richard F.]

A good practice I learnd from Black Titanium is to put acoustical foam in between the fuse ply and the frames of the heli then secure it. Even if you have to remove some spacers.then same thing in the tail. Between boom and fuse. I don't know if you tried this stuff.

[wren1702]

What HS are you running? Lowering the HS cured mine 100%.

[Corrari]

Mine shook aswell and I ended up putting a thick piece of foam between the frame and the wood structure at the top of the fuse. Also lowered head speed. Also make sure the wood base is well glued in the fuse as any loose fitting stucture will cause vibes. I went through and epoxyed everywhere the wood meets the glass fuse. I even epoxyed the skids to the fuse where they go through the holes so as the skids dont vibrate.