A "Lockhart Prop" Update...

David Lockhart DaveL322 at comcast.net
Wed May 26 09:53:00 AKDT 2004 

My guess - The 15.75-13 3b will turn 300 RPM less than the 15.75-12 3b (and
pipe might need to move out 1/2").  Relative to the "average" props
currently being used, the 15.75-13 3b has good downline braking (I'd say
about like the 17-13 std 2b), the downline braking of the 15.75-12 is better
(maybe slightly better than a 17-12 std 2b), and the 15.75-11 3b is better
yet (slightly better than an 18-10 2b).  The 3 blades are much quieter, and
easier to fly constant speed than a comparable 2 blade.

Regards,

Dave "Prop" Lockhart
DaveL322 at comcast.net

----- Original Message -----
From: <vicenterc at comcast.net>
To: <discussion at nsrca.org>
Cc: "Bob Pastorello" <rcaerobob at cox.net>; <discussion at nsrca.org>
Sent: Wednesday, May 26, 2004 9:13 AM
Subject: Re: A "Lockhart Prop" Update...


> Bob:
>
> Let's us know when you tried the new prop.
>
> Vicente
>
>
> > Cox has been a wreck.  I just got this rpm message NOW (5:30 am,
> > Weds)....Dean, Vicente, my OS 1.60 on 15% with the Mac's 1290 at 19.75
> > turned Lockharts 15.75 x 12 three blade at 8160.  A different flavor of
15%
> > ran 7920.
> >
> > Way too much.   I've ordered the 13 pitch and will try it.
> >
> > Bob Pastorello
> > rcaerobob at cox.net
> > www.rcaerobats.net
> >
> >
> > ----- Original Message -----
> > From: <vicenterc at comcast.net>
> > To: <discussion at nsrca.org>
> > Cc: "Dean Pappas" <d.pappas at kodeos.com>; <discussion at nsrca.org>
> > Sent: Tuesday, May 25, 2004 11:11 AM
> > Subject: RE: A "Lockhart Prop" Update...
> >
> >
> > > Just for your information.  Both the Mintor 140 and the OS 140 RX are
> > turning the 15.75x11 at around 7700 and 7600 respectively.  The Mintor
is a
> > little stronger but the difference is not noticeable.  One time an sport
> > pilot approach me and asked me if my plane was ELECTRIC.
> > >
> > > Vicente
> > >
> > >
> > > > Go for it! Please remind me what are the particulars of your setup?
i.e.
> > > > pump,pipe etc.
> > > > Dean
> > > >
> > > > -----Original Message-----
> > > > From: Bob Pastorello [mailto:emc2300 at yahoo.com]
> > > > Sent: Tuesday, May 25, 2004 10:50 AM
> > > > To: discussion at nsrca.org
> > > > Subject: RE: A "Lockhart Prop" Update...
> > > >
> > > >
> > > > Dean, I have NO doubt it will turn the 13.  My 12 was turning 8160
on
> > > > 15%, and it wasn't screaming lean.  Pipe was actually long-ish at
> > > > 19.75.  I plan on doing a 13 just to see....
> > > >
> > > > Bob.
> > > >
> > > > --- Dean Pappas <d.pappas at kodeos.com> wrote:
> > > > > Sounds good Bob,
> > > > > Actually the full 13-inch pitch offered great braking on a 140 RX
> > > > > with long pipe, but the engine/pipe/and needle all had to be
spot-on
> > > > > to get the desired performance. That's when Dave started
de-pitching
> > > > > the prop. I'm curious as to what RPM your 160 turns the 12" pitch
> > > > > prop, and as to whether the 160 will turn the stock 13" with
> > > > > authority. That will be super quiet.
> > > > > Dean
> > > > >
> > > > > -----Original Message-----
> > > > > From: Bob Pastorello [mailto:emc2300 at yahoo.com]
> > > > > Sent: Tuesday, May 25, 2004 9:56 AM
> > > > > To: discussion at nsrca.org
> > > > > Subject: Re: A "Lockhart Prop" Update...
> > > > >
> > > > >
> > > > > My error, Dave corrected me - it IS a 15.75 x 12.  And turns quite
> > > > > well
> > > > > on the 160.  Love it.
> > > > >
> > > > > Bob.
> > > > > --- vicenterc at comcast.net wrote:
> > > > > > Bob:
> > > > > >
> > > > > > I also using the "Lockhart Prop" on my Hydeout with same good
> > > > > > results.  I started to fly Masters this year and I was looking
to
> > > > > > reduce the down lines the speed of the Hydeout.  I also was
looking
> > > > > > for a hot and humid day and the engine (OS 140 RX) was able turn
> > > > > the
> > > > > > prop very well, and I didn't have problems.
> > > > > >
> > > > > > I flew my Focus and tried the prop.  I really liked the "constan
> > > > > > speed" effect on the Focus also.  The one I am using is 15.75x11
> > > > > > (original 15.75x13).  Probably you have the Mintor 1.7 or OS 160
> > > > > > since you are using 15.5x12.  It is 15.75 or 15.5?  I think I
have
> > > > > > 15.75.
> > > > > >
> > > > > > Vicente Bortone
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > > > ATTACHMENT part 2 message/rfc822
> > > > > > From:    "Bob Pastorello" <rcaerobob at cox.net>
> > > > > > To:    "NSRCA" <discussion at nsrca.org>
> > > > > > Subject:    A "Lockhart Prop" Update...
> > > > > > Date:    Tue, 25 May 2004 02:10:40 +0000
> > > > > >
> > > > > > This past weekend, I enjoyed the challenge (ahem) of attempting
to
> > > > > > fly in the most incredible turbulence, gusts, and changes in
> > > > > > direction of wind during a pattern contest that I can recall.
The
> > > > > > first thing I made note of on practice day was that the APC 17 x
12
> > > > > > Std was WAY too fast on the Arresti (11 lbs), so I had to try
the
> > > > > > Lockhart Twister....bolted on at the motel on Friday night...
> > > > > >     Saturday - early enough to rudely awaken all the sloths in
the
> > > > > > motor home (Team A/S, you there??), I managed a quick test
flight.
> > > > > I
> > > > > > was happily surprised to clearly see what I was after.  Good
> > > > > > acceleration - not nearly as rapid on the bite as a 2 blade Std,
> > > > > but
> > > > > > plenty good - and really exceptional braking.  The three blader
> > > > > just
> > > > > > offerred this very smooth dynamic brake that really made it
easier
> > > > > to
> > > > > > manage things.
> > > > > >     My thanks to Dave Lockhart for doing his re-pitch, and my
plea
> > > > > to
> > > > > > Fred Burgdorf to make a mold.  The 15.5 x 12 three blade is a
> > > > > > wonderful setup...mine was turning about 8150 on Magnum 15%,
> > > > > slightly
> > > > > > less on two other brands I was able to run side by side.  I was
> > > > > very
> > > > > > surprised to actually see 120 rpm difference on a prop of this
> > > > > load.
> > > > > >     Anywho - if you guys are looking for a great braking prop
that
> > > > > > still operates in the torque band of our motors - contact Dave
> > > > > > Lockhart....(Lance - I'm sure he can replace your modified
> > > > > > prop...<G>)
> > > > > >
> > > > > > Bob Pastorello
> > > > > > rcaerobob at cox.net
> > > > > > www.rcaerobats.net
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > > > =====
> > > > > Bob Pastorello
> > > > > rcaerobob at cox.net
> > > > > emc2300 at yahoo.com
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > __________________________________
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> > > > =====
> > > > Bob Pastorello
> > > > rcaerobob at cox.net
> > > > emc2300 at yahoo.com
> > > >
> > > >
> > > >
> > > >
> > > > __________________________________
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