Thanks. However the Whirlwind story is confusing. Effectively there
are now two Whirlwind companies, the original for fixed pitch props and
a spin-off for constant speed. I think that Martin at Airmaster was
referring to the blades from the hydraulic constant speed outfit. The
fixed pitch company also has new carbon fiber blades, but I think that
they are 70", which is a bit much. I will follow up. And yes Nigel,
thanks, you are right, I do need to check the inertia data.
This has turned out to be a much more complex question than I originally
understood, but it does make quite a difference in aircraft performance
and reliability.
Jerry
On Jun 11, 2013, at 12:59 PM, Paul McAllister wrote:
> FWIW the new Whirlwind blades are hollow CF and are amazingly light
>
>
> On Tue, Jun 11, 2013 at 11:32 AM, GRAHAM SINGLETON
<grahamsingleton@btinternet.com> wrote:
> Good advice Nigel
> Graham
>
>
> From: "nigel_graham@m-tecque.co.uk" <nigel_graham@m-tecque.co.uk>
> To: europa-list@matronics.com
> Sent: Tuesday, 11 June 2013, 16:42
> Subject: Re: Europa-List: Re: Woodcomp or Airmaster Prop
>
> Hi Jerry,
>
> You=92ve stimulated an interesting thread and received some high
quality feedback.
> My only contribution is to advise you to look carefully at the Maximum
moment of inertia of the combined prop and VP unit if you are seriously
considering fitting a larger diameter Prop.
> Rotax advise a maximum of 6000 Kg cm2 (14,328 lb ft2 in old money).
> You might wish to discuss this with Martin before making a final
decision.
>
> Atb
>
> Nigel
>
>
>
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