On Sunday, May 27, 2007, at 05:42 PM, rampil wrote:
>
> The short prop blades are really only for monowheel a/c.
> When I ordered my Airmaster system for my trigear, I asked for the
> blades to each be 2" longer than the "standard Europa" i.e., monowheel
> spec.
This is of course a step in the right direction; the fan area that a
prop generates is one of several important factors in prop performance.
As Ira says, the Warp Drive blades all come from one mold and are
simply cut down appropriately to serve various aircraft. One problem as
I understand it is that much of the twist in the WD blades disappears
when the diameter is reduced. Another is that since the blade was
designed for a lower speed range (and perhaps lower rpm at cruise) than
the Europa flies in, at higher speeds the innermost portions of the
blade actually generates negative thrust due to the configuration of
the blade cross section. Both of these issues were raised to me by guys
who know a lot more about props than I do and warrant some
consideration. Airmaster confirmed to me as Graham states that the WD
was simply the best available choice...
Fred
--
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.
|