3 blade prop

[David Lockhart]

Now we're getting to the meat of the issue - things like weight, drag,
engine power, engine torque, flying style, and relative priorities for top
speed, acceleration, downline braking, and noise are not the same for all
pilots - so there is no optimum prop that matches everyone.

I've been repitching the 15.75-13 to 10, 11, or 12 pitch depending on what
guys want - I usually find out as much from them as I can about the above
variables and then make a suggestion as to what prop to try.  Some don't
feel they have the power to turn the 10", while others are running the stock
prop.  I mostly run the 11", but sometimes run the 10 or the 12 - depends on
the particular engine and the weather conditions.

Dave

----- Original Message -----
From: "wgalligan" <wgalligan at cnbcom.net>
To: <discussion at nsrca.org>
Sent: Monday, July 11, 2005 9:21 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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