Disciple4123
Veteran
Location: Waynesboro, VA USA
| I used some 1/8" x 1/2" aluminum to brace the upper and inner frames at an angle on an old Ber. Intrepid years back. It stiffened it about 4x and resolved a lot of wobbliness that was present in that airframe. I encourage you to try similar measures, it may likely solve your problems.
I pulled a very old picture of the intrepid, you see the black angled plate in the right rear of the photo, that is what I had made for each side.
When an object has one rigid axis, and one loose one, all vibration or oscillation can be concentrated on the loose axis. That explains why flat aluminum stock, unsupported can flutter so much compared to a round tube in a given installation. Imagine if your boom supports were flat stock, they'd certainly flutter vibrate, but round tubes do not. All helicopter airframes we use are stiffer fore-aft than they are left-right. That being said, some of them have adequate flexure, or the right resonant frequency to their left-right flexure, to cause a problem.
Eric |
It's wobbling at about 5Hz ...
you'll love the difference in the way she flies. The logo is such a smooth machine that you could go rigid and just leave the dampners on the camera platform.
