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Unstable Drone Pitch

PostPosted: Wed Nov 26, 2014 12:27 am
by Deckie
For quite some time the pitch of my small d drone has been unstable. A few minutes after initial tuning the pitch will change by quite a bit (usually rises to start with) and I have to keep stopping to retune it. The other 3 drones are ok. Examining the reed there doesn't appear to be anything wrong with it but I know nothing about fettling. Any ideas about what might be causing it please?
Thanks.
Deckie