Multi Blade Props at Nats

[adriancwong at earthlink.net]

I have tried both the 13.4 X 13.5 three blades, and the 13.8 X 10 four blades on the L and found the 4 blades is much more efficient than the 3 blades.

Adrian


-------Original Message-------
From: wgalligan <wgalligan at cnbcom.net>
Sent: 07/20/03 07:52 PM
To: discussion at nsrca.org
Subject: Re: Multi Blade Props at Nats

> 
> Dave,

Do you think there is any chance that APC will be making a lower pitch
three
blade in the near future?
And would this prop be as effective on the standard O.S.?   I have a
Mintor
1.70 ready to go and do you think the 3 bladed 13 pitch prop would be a
good
match for this engine that has the good low end and mid range grunt?

Wayne G.

-----Original Message-----
From: David Lockhart <DaveL322 at comcast.net>
To: discussion at nsrca.org <discussion at nsrca.org>
Date: Sunday, July 20, 2003 10:53 PM
Subject: Re: Multi Blade Props at Nats


15.75-11  blade (re-pitched from 15.75-13)
OS 10 EFI
Asano Header and pipe
S&W 20/20
7900/7700/1500 - Peak/launch/idle RPM
10 lb 13 oz EMC
Typically less than 90 dB

I did switch to a 17-12N in the extreme wind on Tuesday - which was the
1st time I have used a 2 blade in a contest since working up the 15.75-
11.  Speed control with the 15.75-11 is very easy - it is not super
sensitive to throttle position and brakes very well.

Dave
DaveL22 at comcast.net

----- Original Message -----
From: RUDDERCABL at aol.com
Date: Sunday, July 20, 2003 10:08 pm
Subject: Re: Multi Blade Props at Nats

> In a message dated 7/20/2003 9:18:36 PM Eastern Standard Time,
> rcaerobob at cox.net writes:
>
> > Yeah, Dave wrote me about his.  It is one of the custom twist
> jobbies that
> > he makes...bet it worked just fine.
> >     Any others?
> >
> >
> >
>
> Bob
>
> Dave used that prop at team selection also. Very quiet and pulls
> well . Nice
> combination with his plane and engine .
> I also used an APC  15x13W  3 blade on my OS1.40 powered Focus . I
> liked the
> results of this combo but changed to 2 blade on Tuesday when the
> wind blew so
> hard. I believe Dave also went back to a 2 blade in the extreme
> wind .
> I don't know if any-one else used one .
>
> Robert
>

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> 
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