The necessity for all that would be for direct drive engines. But always
nice to confirm that geared reductions don't have resonances.
Duncan McFadyean
----- Original Message -----
From: <ptag.dev@ukonline.co.uk>
Subject: Re: Flying: Performance: Speed kit.
> Hi! Mike.
> MT Propellers ,in my case supplied the propeller
> kit fully balanced, however they insisted that to
> maintain warranty conditions it must be supplied
> back to them within 50 hours for strain gauge and
> dynamic balance tests with the particular engine
> combination to identify any resonant RPM's over
> the full range of operation.
> This now completed a "non-flying" peak resonant
> range between 2150 rpm and 2400 rpm has shown to
> be present, and they are recommending not to
> cruise in that range if possible.
> I guess if I can't live with that it means
> another trip back to the factory for flight
> testing to try to narrow the non- useable range.
> The point about this is that simple balance isn't
> the full story and further strain gauge testing
> needs to be carried out to do the job in a
> professional manner. Only with that test can it
> be established what crankshaft oscillation is
> taking place, allowing you to select the most
> engine /propeller friendly flying.
> Best regards
> Bob Harrison
> G-PTAG Europa MKI /Jabiru 3300
>
>
> Quoting DuaneFamly@aol.com:
>
> > Please excuse a dumb question.
> >
> > How do you know you have an out of balance
> powerplant setup? If it is
> > "really" out and you start the engine, can you
> do damage before being
> > able to
> > shut it down?
> >
> > Mike Duane, San Jose (soon to be Redding)
> California
> > Lurking for a long time but hope to build soon.
> >
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>
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