This is from the EAA.
https://www.eaa.org/eaa/aircraft-building/builderresources/while-youre-building/building-articles/control-systems/control-surface-balancing-in-homebuilts
To add to that, the faster a plane is, the more important it is to have
control surfaces balanced. Many slow planes (less than 60 mph cruise
speed) don't have any control balance at all, but since the forces go up
at the rate of the square of the speed of the plane, it becomes critical
on faster aircraft. Looseness in control between the controls and the
aileron/rudder/elevator will exacerbate any problems because it allows
the control surface to oscillate independently.
You'll note that the accident happened while doing a high speed pass.
You can also see YouTube videos of flutter that were survived. In one
instance in an ultralight that was pointed downhill, the person chopped
the power immediately and the flutter stopped. Ultralights tend to be
very draggy, so that made it easy to get out of the flutter mode. If you
ever experience flutter and survive, ground the plane and do a thorough
inspection.
There's good reason that red lines are put on airspeed indicators and
limits placed in the POH. When you're doing your testing on your plane,
gradually approach the red line.
On 5/16/2022 6:38 PM, John Gotschall via KRnet wrote:
Can anyone recommend a good book or source for info on how to
calculate the correct control balances for a variety of
wing/horizontal stab types?
jg
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