One of the guys here tried a 3 blade Cato on his Elite amphib when he
upgraded to the O-375 engine. On his first flight, he thought there must be
something wrong with his new engine, as his climb rate was less than his old
360 with the Sensenich. But after checking out the engine further and not
finding anything wrong, did some more flying with the new prop. On take-off
it only turned 2450, so he lost take-off performance, and poor top speed as
well, as it also quickly over revved in straight and level. After some phone
and email conversations with the Cato guy, he was not getting any
satisfaction.
Then I let him try my Sensenich from my 360, just to confirm if the new
engine was working properly. His take-off RPM went to 2550, so much better
take-off performance, his climb rate was way higher, and revved lower at
straight and level, but his top speed went up by about 20 mph. So the
Sensenich beat the Cato on take-off, climb and top speed performance.
He then bought a new Sensenich (same as mine that he tested with), and ended
up in a dispute with the Cato guy when he tried to return that prop. I think
the Cato might be better suited to Supercubs with a much lower speed range
than the Rebel.
One thing I learned about the Sensenich props back when I had the 150 hp
320, is that you can't over pitch them. They perform much better at finer
pitch, including top speed. Even 2 inches pitch makes a huge difference. I
found this out when flying with another identical Rebel amphib who had a 74
X 56, while I had a 74 X 54. I would beat him on take-off, climb and top
speed. He then re-pitched his to the same as mine, and our performance was
identical after that.
Another local Rebel amphib had a McCulley and he had really poor
performance. He then bought a Sensench, but the 56 pitch as he had the 160
hp. But he still couldn't match my performance even with the higher hp. He
then re-pitched his also to 54, and then had good performance. So even with
the high compression 320's the 54 pitch Sensenich is still better if you are
on amphibs.
BTW, I had a side by side fly-off with a 360 Supercub on straight floats
this summer from an alpine lake. Both of us had 2 people, and about 3/4
fuel. I got off the water first, much higher climb rate, and of course no
comparison in cruise with the much slower Supercub. So, needless to say, I
am still very happy with my Rebel amphib.
Walter
-----Original Message-----
From:
mike.davis@dcsol.com [mailto:
mike.davis@dcsol.com] On Behalf Of Wayne
G. O'Shea
Sent: Friday, December 02, 2011 3:29 PM
To:
rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Warp drive or Prince prop
I'm running a 74-44 on mine (150HP) that came off a 160HP engine. It's just
a hair too coarse to get the full climb RPM that I would like.... but it's
working better than my Warp did and I'm getting out of SHORT back country
lakes with 2 big guys.. 25 gallons of fuel AND the canoe on the right side!
I'm thinking though.. that the prop I installed to Mark Morin's Rebel, 150HP
(Walter Klatt's old engine) was a 74-46 and he's happy with it. Lonnie
Prince's props seem to be here and there when it comes to specific engines
(and pitch they are supposed to be) and in the early days many went back for
a repitch before they got it right.
I'm with Curt as well... if I need to buy another prop, it will be a Catto !
(although I highly doubt I'll head for prop #5 !)
Wayne O'Shea
----- Original Message -----
From: "Wayne" <
Wayne@barrett-architect.com>
To: <
rebel-builders@dcsol.com>
Cc: <
rebel-builders@dcsol.com>
Sent: Friday, December 02, 2011 6:17 PM
Subject: Re: [rebel-builders] Warp drive or Prince prop
Sorry, the engine is a O-320, 150 hp.
Regards
Wayne Barrett
Barrett Architect Inc.
708 Gerrard Street East
Toronto, Ontario, M4M 1Y3
Tel 416 469 8000
Fax 416 469 8056
Cel 416 587 1415
On 2011-12-02, at 5:36 PM, "Wayne G. O'Shea" <
oifa@irishfield.on.ca>
wrote:
You won't be happy with the 4 blade Warp.. and it's just ugly to boot!
You'll get more help on the Prince prop if you tell everyone what the
engine
and HP is...
The Clamars's are a great float and Clair will shoot me for saying it...
but
IMHO heavy for a Rebel, so be aware and plan for it. With 180HP on an
Elite
though (or if you have that in the Rebel)...they work great. They are a
GREAT performing float that makes up for some of the extra weight that
they
are in comparison to the Murphy amphibs. (we are talking at least 160lbs
heavier). I did the very first Elite to Clamar amphib installation on the
planet and know it pretty intimately... then Clair came over and measured
my
struts.. ;O)
Wayne
----- Original Message -----
From: "Wayne" <
Wayne@barrett-architect.com>
To: "Rebel Builders" <
rebel-builders@dcsol.com>
Sent: Friday, December 02, 2011 5:07 PM
Subject: [rebel-builders] Warp drive or Prince prop
I recently purchased a rebel which was on wheels (at the speed I do
things
I would be 100 by the time it was finished). I also purchased a set of
Clamar floats that will be installed in the spring in time to be ready
for
some fun at the cottage.
I need to purchase a new prop that will be pitched for the float
installation and was looking at the warp drive 4 blade version
(recommended by the manufacturer). I have been told by a couple of
people
to go with the Prince prop instead.
Can anyone give me an insight on which would be better? If I went with
the prince, what would be the recommended diameter and pitch?
Regards
Wayne Barrett
Barrett Architect Inc.
708 Gerrard Street East
Toronto, Ontario, M4M 1Y3
Tel 416 469 8000
Fax 416 469 8056
Cel 416 587 1415
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