3 blade prop

[Bob Pastorello]

Wayne - which of the three had the least rudder workload?

Bob Pastorello
www.rcaerobats.net
rcaerobob at cox.net
----- Original Message ----- 
From: "wgalligan" <wgalligan at cnbcom.net>
To: <discussion at nsrca.org>
Sent: Monday, July 11, 2005 8:21 PM
Subject: Re: Re: 3 blade prop


>I had the oportunity to try 3 diferent props back to back at the Nedeland
> contest on Sat night.
>
> 1.17x12 reg 2 blade APC
> 2. 16x11 GSW(Clevland) 3 blade c.f.
> 3  15.75x11 3blade APC that was a Dave Lockhart re-pitch.
>
> My observations
>
> 17x12 best overall for penetration and power in the verticals but the 
> faster
> of the three on the downline.
> 16x11  good overall speed but lacks in the vertical in pulling or pushing
> the model into a vertical, slowed down more then the 17x12
> 15.75x11 good speed management and when pulling through looping segmments
> seemed to have much more authority.  It felt as if I took out some of the
> expo in my elevator on the pulls. When slowing down for the spin entry it
> was like putting on the brakes I had to carry a touch more power to the 
> spin
> entry.
>
> For windy conditions the 2 blade and for calmer conditions the Lockhart 3
> blade seem to be the two best suited for my OS on my wide body
> airplane(Aries).
> On my Entropy, a faster design less drag, the GSW 16x11 works fine.
>
> Thanks to Brian Hebert for letting me try his Lockhart prop as it gave me 
> an
> opportunity to see the true difference in prop selection side by side.
> As Brian pointed out to me every airplane has its one prop that seems to
> match its speed and performance envelope.  So what works for me may not 
> work
> for you or your friends.
>
> Smooth FLying...
>
> Wayne Galligan
>
>
> ----- Original Message -----
> From: "Karl G. Mueller" <kgamueller at rogers.com>
> To: <discussion at nsrca.org>
> Sent: Monday, July 11, 2005 7:22 PM
> Subject: Re: Re: 3 blade prop
>
>
>> Bob,
>>
>> I just tried the 15.3/4 x 13 three blade APC and it is straining the
> engine
>> a little and the vertical is not as good. Best results I get with the 
>> 16.5
> x
>> 12
>> two blade. Haven't tried to repitch the three blade.
>>
>> Karl G. Mueller
>> kgamueller at rogers.com
>>
>>
>> ----- Original Message -----
>> From: <rcaerobob at cox.net>
>> To: <discussion at nsrca.org>
>> Sent: Monday, July 11, 2005 3:55 PM
>> Subject: Re: Re: 3 blade prop
>>
>>
>> > Randy - what pipe, length, nitro you using?  What rpm you getting with
>> that?
>> >
>> > My OS's will TURN the 13 pitch, but it is a strain I don't like to put
> on
>> the motor.
>> >
>> > Bob Pastorello
>> > >
>> > > From: randy10926 at comcast.net
>> > > Date: 2005/07/11 Mon PM 03:11:37 EDT
>> > > To: discussion at nsrca.org
>> > > Subject: Re: 3 blade prop
>> > >
>> > > I would think so.
>> > >
>> > > My os160 have no problems with an APC 15.75X13 three blade.  Since I
>> heard the pitch measure less for a Bolly than an APC, I wonder if a Bolly
>> 18X10 would be enough prop.
>> > >
>> > > Randy
>> > >
>> > > -------------- Original message --------------
>> > >
>> > > Bob
>> > >
>> > > Do you think that a OS 1.60 will turn the Bolly 18x10 three blade ?
>> > >
>> > > Robert
>> > >
>> >
>> > Bob Pastorello, El Reno, OK, USA
>> > rcaerobob at cox.net
>> > www.rcaerobats.net
>> >
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