On Wed, 02 May 2018 13:58:42 -0700, AS wrote:

On Wednesday, May 2, 2018 at 3:32:35 PM UTC-4, Paolo Guardigli wrote:
Hello everybody,
we in my Club(Pavullo in Italy) are suffering(2 times) a very strange
vibration of the duodiscus for a minute or so after the glider is
released from the rope,after one minute the vibration is finishing.
We are trying to investigate why it happened but we are not able to
find out the reason.
Does someone already experienced the same problem?

Thanks a lot to everybody

Paolo Guardigli

Hello Paolo - can you be a bit more specific about that vibration? What
is the estimated frequency of that vibration - low, high?
What is vibrating? The wings, the tail-boom or ??

Could it be that the nosewheel got spun-up during the ground run and is
still spinning after release? I'm pretty certain I've noticed that once
or twice in an ASK-21 when the glider wasn't balanced on its main wheel
soon enough.


--
Martin | martin at
Gregorie | gregorie dot org