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peterz(at)zutrasoft.com
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 Posted: Mon Jun 22, 2020 9:49 am Post subject: Question for the classic-mono fliers |
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Who out there are flying with an airmaster prop?
What spinner is used, and how does it fit against the classic cowl (Isn't the airmaster spinner too small?)?
Are all Classic mono's (with the XS tailwheel) all flying with the 62" prop? Can the 64" (whirlwind) be used? Could the 64" be used if the XS tailwheel spring is lowered allowing for increased deck angle?
How much higher is the XS thrust-line vs the classic?
Many thanks for any/all info!
Cheers,
Pete
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JonathanMilbank
Joined: 14 Apr 2012
Posts: 390
Location: Aberdeen area
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| Posted: Mon Jun 22, 2020 3:16 pm Post subject: Re: Question for the classic-mono fliers |
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Hi Pete,
My aircraft which I built was a Classic Mono for over 900 hours and had a 912UL 80hp with Airmaster and 62" diameter tapered blades. After converting it to a tricycle and installing a 912ULS 100hp with 64" diameter wider blades, it has flown another 400+ hours during which time the firewall forward was altered to the Neville Eyre cowls, making it very much more like the XS f/w forward. (See attached image.)
I never actually measured the propeller ground clearance with the fuselage horizontal while it was still a Mono with 62" propeller, but subjectively I guess it would be much the same clearance as an XS tricycle with 64" propeller.
While it was still a Classic Mono, Airmaster made spinner bulkheads for me which very well matched the Classic cowls. No doubt they still have the molds. When I converted to Nev Eyre's cowls, I acquired a smaller diameter spinner which matches the XS cowls and gave away my big spinner with bulkheads to someone who needed them.
I don't believe that it would be necessary to lower the XS tail wheel spring, because reduced propeller ground clearance with a 64" propeller becomes more significant when the tail gets raised during take off. Yet I flew happily enough like that for many hours before concerting to tricycle u/c. The thrust lines for the XS and the Classic are the same.
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