Thanks Tony, I was about to ask you the question. It would seem that the
914 and Airmaster prop was a good decision.
regards,
Mike Parkin (312, G-JULZ) Hoping to have it flying in time for the PFA
Rally.
----- Original Message -----
From: "Tony Krzyzewski" <tonyk@kaon.co.nz>
Subject: Prop balance/dynamic testing
>
> As part of the testing programme for the Airmaster we did a complete set
of in
> flight vibration tests of the hub/prop combination. We covered all flight
modes
> and, at the PFA's insistance, included rapid throttle backoff tests at VNE
> where another brand of CS prop had shown bad vibrations.
>
> The Airmaster hub/warp drive blade combination after static testing showed
very
> little vibration but still showed improvement after dynamic balancing - to
the
> extent that after the first flight following balancing we thought that the
test
> head had failed as there was almost no vibration indicated. We did note
that
> replacing the plastic spinner with a metal one had a marked improvement on
the
> ability to easily balance the prop which is why a decision was made to
make
> available metal spinners for use with the Airmaster hubs.
>
> Also built into the controller is a function to lock out areas where a
> particular speed range can cause vibration. On the controllers supplied
for
> Jabiru engines, for example, there are several bands which are locked out
and
> the controller will not permit constant speed operation at those engine
rpm
> settings. For the Rotax series no lockouts were necessary and the prop can
be
> set to operate at constant speed right across the range.
>
> Regards
>
> Tony
> ... in the middle of spraying control surfaces.
>
>
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