3 blade prop

Tue Jul 12 06:02:13 AKDT 2005

I'm using one of Dave Lockhart's 15 3/4 x 11 re-pitched APC's on a 10lb 9oz 
EMC2 with an OS 140RX and ES 2C140S90 pipe with great results. Mintor head, 
Perf Specialties AAC piston and liner, S&W 20% nitro 18% oil and 1 head 
shim. Take off rpm is between 7600 and 7700 on a 80 to 90 degree day. I find 
I can control speed far greater than any 2 blade prop I've tried. As others 
have already stated, the great brakes this prop gives takes a little getting 
used to. I like the prop so much I have 3 !!!
Ed M.
----- Original Message ----- 
From: "Wayne Galligan" <wgalligan at goodsonacura.com>
To: <discussion at nsrca.org>
Sent: Tuesday, July 12, 2005 8:24 AM
Subject: Re: Re: 3 blade prop

> Good question Bob,
>
> I didn't really pay that much attention to that factor as I only put one
> flight on per prop.   But I did like the way David's prop tractored 
> through
> the pulls and the way it slowed down going into the spin entry. The 11 
> pitch
> seemed to be just about the right load  for the OS 1.40 and Aeroslave pipe
> setup too.
>
> What are your thoughts on the rudder work load?
>
> Wayne
>
> ----- Original Message ----- 
> From: "Bob Pastorello" <rcaerobob at cox.net>
> To: <discussion at nsrca.org>
> Sent: Monday, July 11, 2005 8:36 PM
> Subject: Re: Re: 3 blade prop
>
>
>> 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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