OK … what about a Elippse prop?
Anyone have comparative data?
Jim
From: Lancair Mailing
List [mailto:lml@lancaironline.net] On Behalf
Of Larry Henney
Sent: Saturday, March 27, 2010
4:38 PM
To: lml@lancaironline.net
Subject: [LML] Great Prop for LNC2
Craig,
I ran the Hartzell 68" prop on my 360
for many years and 700 hours. It's a good prop and maxed out around 217
kts. I now run a 68x85 fixed pitch prop from Craig Catto. His
prop is 9 mph faster than the Hartzell from sea level (plus 44 inches)
(225 kts) to 18K. Or stated another way, I can save 1 1/2 gph at the same
TAS. The constant speed is nice but needed balancing. I'm sure it's
a little stiffer than that MT you're looking at. The Catto is much
faster and a delight in slow cruise at 185 kts (7gph) and smooth as
glass. I believe the Catto prop to be the most efficient choice.
The biggest difference (perhaps obvious)
between the Hartzell and Catto is around the airport. When within 10 miles
of the field I can go to idle and always make it with the Catto. The
Hartzell by contrast is a giant speed break when at idle power. I carry power
all the way to touchdown with the Hartzell. Takeoff roll provides the
opposite affect. I can roll over a 1000 to sometimes 1800 feet to get
airborne with the Catto. The Hartzell has much shorter takeoff
rolls. I recently took off from Steamboat Springs (7K MSL) on a cool day
(Catto Prop). The plane took 2500 ft at max gross wt. This seemed
ok on a 4500 ft runway although the Hartzell would have been more comfortable.
BTW, we're running a 68x80 Catto on Rick
C.s 160 hp 320 as well. It turns 2400 rpm 156 kts (179 mph) and
2600 rpm at 169 kts (194 mph). It is a little older prop design (perhaps
slightly less efficient) than the props that Craig now makes. Top speed
197 kts (227 mph) at 2950 rpm.
I like Catto Props so much that I might
one day be willing to part with my Hartzell.
Larry Henney
Race 36
N360LH
925 hours
From:
marv@lancair.net [mailto:marv@lancair.net]
Sent: Friday, March 26, 2010 9:17
AM
To: lml@lancaironline.net
Subject: Re: Prop for LNC2
Posted for Sky2high@aol.com:
Craig,
Lyc 320's have no restriction on how long you can run your engine
at
takeoff power. I ran the Air Venture Cup races at WOT, 2680
RPM (it felt
good
there) and 2000-3000 MSL for the Dayton to Finish Line leg
- just a bit over
2 hours. Uh, you will need adequate fuel flow
for that.
Grayhawk
In a message dated 3/26/2010 5:23:43 A.M. Central Daylight
Time,
craig@skybolt.net writes:
Hi Randy,
Your very funny. You have quite a collection too
that may be slowing you
down. Maybe we should be requesting that they start
making the trophies
out of aluminum.
That 3 blade scimitar MT is a sexy looking
prop. I was hoping that I
would hear everyone come back that they were faster with
it. Love the quiet
and smooth but got to have that speed baby. Tonight
I did a test run with
some minor tweaks and it ran 212 kts at 3000
ft. Std day. 2550 and WOT.
Guess I am going to need rocket pods to do much
better.
Craig
N73S
L320
From:
randy snarr <randylsnarr@yahoo.com>
Sender:
<marv@lancaironline.net>
Subject:
Re: [LML] Re: Prop for LNC2
Date:
Thu, 25 Mar 2010 22:33:39 -0400
To:
lml@lancaironline.net
(http://mail.lancaironline.net:81/Lists/lml/Message/54477-H.txt)
(http://mail.lancaironline.net:81/Lists/lml/Message/54477-P.txt)
I have only run the MT 3 blade. I too love this propeller.
Very smooth and
light. On my IO320 the prop weight is only 37 lbs. Please
don't ask how I
know this but it is a wood core, combination of spruce and a
highly
compressed beachwood If I recall what the factory told me, with
a fiberglass
shell
and stainless leading edge for protection from moisture ect..
Wood also is flexible and has natural dampening properties. It
is the
only propeller I have run on the airplane but it is fast.
Even with my
Legacy
style tips (25' wing) I am also running the larger legacy tail
(MKII) and a
completely stock IO320 ( injected/ Elec IG) and I can get to
198-200 KTS
TAS at 8000.
I would love to try other propellers but that is too much of a
hassle for
me. I am happy with the set up and would definetaly buy
another one..
Craig, If I recall, weren't you at about 210 KTS with your
current set up?
Leave the OSH GC trophy home and the weight savings alone will
get you
another 5 KTS...
FWIW...
Randy Snarr
N694RS
235/320
--- On Wed, 3/24/10, Lorn H Olsen <lorn@dynacomm.us>
wrote:
From: Lorn H Olsen <lorn@dynacomm.us>
Subject: [LML] Re: Prop for LNC2
To: lml@lancaironline.net
Date: Wednesday, March 24, 2010, 9:28 AM
Craig,
I love my _http://www.aerocomposites.com/_
(http://www.aerocomposites.com/)
prop. I have over 600 hours on the prop, including an
overspeed to 3,400
rpm (not the props fault), and the prop doesn't even have 1
scratch on the
leading edge. I have seen Hartzel's that looked like they
needed an
overhaul at 200 hrs on PA-180's.
Aero Composites uses a nickel leading edge. No inspection
required for the
overspeed according to Aero Composites.
Lorn
> Posted for "Craig Schulze" <_craig@skybolt.net_
(unknown://mc/compose?to=craig@skybolt.net) >:
> Date: March 23, 2010 6:06:52 AM EDT
>
> Hi Guys,
>
> Does anyone have any feedback on different props for
the Lancair
320/360?
> Has anyone tried a
Hartzel Scimitar? MT? Any performance
differences
over
> the standard Hartzel 2 blade?
>
> Thank you,
> Craig Schulze
> Lancair 320
--
Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:_lorn@dynacomm.us_
(unknown://mc/compose?to=lorn@dynacomm.us)
LNC2, FB90/92, O-320-D1F, 1,700 hrs, N31161, Y47, SE Michigan
--
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