Today's Message Index:
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1. 07:54 AM - Re: propeller optimization (rampil)
2. 07:54 AM - Re: propeller optimization (rampil)
3. 12:37 PM - Re:propeller optimization (dmac11@telus.net)
4. 03:41 PM - Re: Re:propeller optimization (Fred Klein)
5. 04:35 PM - Re: Re:propeller optimization (Graham Singleton)
6. 05:43 PM - Re: propeller optimization (rampil)
7. 10:54 PM - Re: Re: propeller optimization (Fred Klein)
Message 1
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| Subject: | Re: propeller optimization |
Dwayne,
When you mention the gear ratio of the 912, you are talking about the
80 HP engine right?
The 912S and 912ULS use 1:243
Ira N224XS
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Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=115055#115055
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| Subject: | Re: propeller optimization |
of course there is a decimal point in the 2.43
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Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=115056#115056
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| Subject: | re:propeller optimization |
Yes Ira the 912 80 hp version comes with 2.27:1 gear ratio, @ 5800 rpm, prop
will be 2555 rpm, 912s & 914 use 2.43:1 ratio @ 5800 rpm, prop will be 2386 rpm.
Regards, Dwayne
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| Subject: | Re: re:propeller optimization |
Those concerned w/ this topic would be well to question the basic
performance of the Warp Drive blades. In a series of emails I exchanged
w/ Airmaster some time ago, they concede that the shortened blades
needed for the Europa and given the speed ranges in which it flies,
these blades leave much to be desired.
Fred
A194
...hoping to trial fit wings to CM next week...sigh...
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| Subject: | Re: re:propeller optimization |
Fred
Good point. I spoke to the Airmaster guys a few years ago and they told
me they spent a lot of time looking for the right blades. Warp were far
from ideal, the design of the prop was for ragwing microlights, but
nobody else was cooperative. Sad, Arplast would have been ideal but the
chemistry didn't work so both Arplast and Airmaster lost out. Alain
Petit, the Arplast boss is a nice guy but his English isn't confident
and I don't suppose the NZ guys speak much French. What an opportunity
missed. Wish I had been in the right place a few years earlier!
Graham
Fred Klein wrote:
>
> Those concerned w/ this topic would be well to question the basic
> performance of the Warp Drive blades. In a series of emails I exchanged
> w/ Airmaster some time ago, they concede that the shortened blades
> needed for the Europa and given the speed ranges in which it flies,
> these blades leave much to be desired.
>
> Fred
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| Subject: | Re: propeller optimization |
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. It was actually a no-charge ECO since the stock blades are
longer still.
Ira N224XS
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=115109#115109
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| Subject: | Re: propeller optimization |
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
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