Trying to hunt down an interesting (concerning?) cruise resonance. Eliminat
ing any unbalanced prop contribution using the very nice piece of kit from S
mart Avionics, the PB40 using dual two axis accelerometers (i also have his s
martass in both my planes).
Having used the dynavib in the past, i find the pb40 provides much more info
, including spectrums, and the two accelerometers allows me to measure in al
l axis=99, including torsional resonances. Still digesting the differe
nces when the resonance kicks off.
I did find that short-run ground balancing isn't good enough to get a consis
tent result, and the dynamics in flight also appear to effect the results. S
o fly with it i did.
Cheers,
Pete
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