What kind of prop are you running now Rene, I am also getting ready to
purchase a prop. Darrell
----- Original Message -----
From: "Dave Dugas" <davedq2@yahoo.com>
To: <Q-LIST@yahoogroups.com>
Sent: Tuesday, November 30, 2010 10:44 PM
Subject: RE: [Q-LIST] Cloudcars prop


Rene,
Those numbers got my attention, especially since I'll be shopping for a new
prop soon. I've got almost 700 hrs on the original Cowley prop / Revmaster
combination, but nohhere near the speeds you're getting. At 3000 rpm I'm
looking at 140 mph IAS. I'll be anxious to hear more.
Dave Dugas

--- On Tue, 11/30/10, Rene Robertson <q2robertson@yahoo.ca> wrote:


From: Rene Robertson <q2robertson@yahoo.ca>
Subject: RE: [Q-LIST] Cloudcars prop
To: Q-LIST@yahoogroups.com
Date: Tuesday, November 30, 2010, 11:14 AM






Hi Jon,

I concur and in my excitement I forgot to mention that these were IAS. My
airspeed indicator has been fairly accurate as cross referenced by others I
fly in formation with.
After flying many hours in the same airplane, same engine and different
props, you get a feel for how accurate your airpseed indicator is.
Having said that, this was just an ititial trial run on a day with low
ceilings and I told Jay I'd like to put in a few more flights to report back
with more data (I did have my GPS on to cross reference). I agree that the
methods laid our in the articles and using TAS is the best. When I get this
done I will report back.

Cheers,
Rene

--- On Tue, 11/30/10, Jon Finley <jon@finleyweb.net> wrote:

From: Jon Finley <jon@finleyweb.net>
Subject: RE: [Q-LIST] Cloudcars prop
To: Q-LIST@yahoogroups.com
Received: Tuesday, November 30, 2010, 10:45 AM



Hi Rene,

Those are great numbers. However; being a stickler for such things, I have
to ask: What type of airspeed are you reporting?? Is this indicated, true,
calibrated, or ??? I'm afraid that without that, it is kinda like me telling
you that my Q2 once flew at 20 kts (it did, massive leak in pitot line so
this was INDICATED airspeed that was not at all accurate).

The best procedure that I have seen for accurately recording speeds was
documented by Paul Lipps in Contact! Magazine issue 88.5 and updated in 89.
Pat Panzera can hook up anyone that wants a copy
([http://www.contactmagazine.com] http://www.contactmagazine.com and
[mailto:editor.contactmagazine@gmail.com] editor dot contactmagazine at
gmail dot com). I am no expert but it is my understanding that the only way
to properly compare performance (either between planes, conditions,
altitude, equipment, etc...) is to use TAS.

Jon

-----Original Message-----
From: "Rene Robertson" <q2robertson@yahoo.ca>
Sent: Tuesday, November 30, 2010 8:32am
To: Q-LIST@yahoogroups.com
Subject: [Q-LIST] Cloudcars prop

I agree with Mike, maybe Dan can put together a list on his website. I had
similar issues at 1000 hours; worn pivot pins on the elevator, T-tail pivot
bearings wearing, tail wheel pivot bolt and holes worn. The mags should be
rebuilt evey 500 hours. I replaced my bottom rudder phenollic with an
Aluminum piece and oil-lite bushing.

Jim, I can't believe we were warmer up north than you this last weekend :) I
went flying to test a new prop and we were at +4 C.

Jay at Cloudcars has been working with me to develop the optimum prop for my
Q2. I believe he's done it. This is one cool looking prop. It measures 54"D
X 56"P. I originally thought it would be way too much pitch for my engine,
but on climb out it gives the same performance as my 54"D X 48"P prop, but
in cruise goes way faster. Here are the numbers:

110 MPH - 2860 RPM initial climb out
120 MPH - 2900 RPM climb out to altitude - 1000'/minute climb rate

150 MPH cruise - 2860 RPM
160 MPH cruise - 3060 RPM
165 MPH cruise - 3080 RPM
then.........

170 MPH - 3120 RPM
180 MPH - 3200 RPM max speed full throttle at altitude

200 MPH - 3320 RPM
210 MPH - 3380 RPM

OAT was 39 F. Alt. 1000' AGL/1200' ASL except for the last two runs which
were in ground effect over the runway sustained for 10,000'. What a
blast.......man things were going by quick.

This is with my modified Revmaster 2165cc in C-GTCA.

Rene
Q2 C-GTCA
















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