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1. 12:39 PM - Re: Sun 'n' Fun? (richardcoo)
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| Subject: | Re: Sun 'n' Fun? |
There's a good deal of noise and interest re variable pitch or constant speed propeller
options for the Jab' 3300. I'm considering a Lightning build myself over
the southern hemisphere winter and spring months and this phase has caused
me to spend more than a few hours researching options. From what I've researched,
here's options so far:
Ameri-Tech - "Whirl Wind" series (2 blade - no pricing offered)
Airmaster - model AP420 (US$7,000) made in NZ
MT Propeller - model MTV-1 (EU8,200), MTV-7 (EU9,700)
Woodcomp - series SR3000, models 3B(EU5,145) and 3J (EU4,845)
Pricing all ex-works and subject to currency fluctuation and individual quotations.
All are electrically manipulated variants as best I can determine, and engage some
form of controller in the instrument panel to control the propeller's angle
of incidence to the free airstream ahead of the aircraft.
There's still work to be done, as Jabiru in Bundaberg, QLD (Australia) appear to
have little research into variable incidence or constant speed propellers. As
such the safest route is to progress with the engine manufacturers recommendation,
or an option with considerable time in service of the engine as the existing
Lightning options have.
That said, however and in the spirit of experimental aviation, there's basis in
my opinion to consider a variable pitch or constant speed option. However caution
and a well thought out strategy and testing plan as part of the aircraft's
initial testing or in the case of a retrofit, separate testing is warranted
to gather data, familiarise the pilot with operating techniques and demonstrate
the acceptability or non-conformance of a propeller option. Maybe one of the
manufacturers will get behind a well developed testing program to validate their
variant on a Lightning?
In summary, proceed with caution. Utilise the resources available to you in the
form of DAR, engineering, expertise, additional research and safe flying.
Kind Regards
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http://forums.matronics.com/viewtopic.php?p=369338#369338
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