A couple of questions:
1) is that an O320 on a rebel?
2) where is the speed measure taken - IAS or GPS?
Garry
On Mon, 2006-08-28 at 08:45 -0400, Rebflyer@aol.com wrote:
Hi all,
Well it's time to admit I have now purchased prop #3. I vowed in the
beginning that I would not do that, but here I am anyway.
Short history is this. When first certified I installed a McCauley 76".
Great prop on wheels. It spun at about 2300 rpm on initial roll. I felt it was
to coarse a pitch for the floats and it could not be repitched any more. Then
came the Warp drive 3 blade sq tip 72". I really enjoyed that prop. I flew
that for almost 300 hrs prior to the cracks in the blade clamping area. Pitched
for 2300 rpm on the initial roll it was a bit slow off the water for my
liking, but cruise ok. (as a side note, each 10 rpm change seemed to relate to 1
mph). Pitched for 2450 on the initial roll it smoked off the water,
especially light with cool temps( 60ish f) but 85mph for cruise.
I shipped the prop and hub back to Warp. For the cost of 1 blade they sent
me a new hub and 4 blades. 70" sq tip. The performance from the 3 to the 4
is the same as far as I could tell.
The rpm range on the Warps was about 600 rpm. More to come on this.
Well after waiting for 8 mo I now have a three blade 68" 46 pitch Catto
prop. Very well known in the canard community for speed and durability. I
figured if it can take nuts, bolts and exhaust systems going thru the prop without
catastrophic failure it should do fine on the front of a float plane.
After several conversations with Catto the numbers based on the engine I'm
using and the hp it produces I decided on 2450 for the initial roll with
125mph cruise at full throttle. 2750 rpm.
We hit those numbers right on the money. At 2450 it comes of the water in
90 deg f like the Warp did in 60 deg f !!! I can't wait till it gets cool
again! Cruise at full throttle shows 2775. 300 rpm range. I think I need to
check my tack(grin). Again in 90 deg f temps I'm indicating 115mph. That's the
fastest I've been on floats. At 2500 it is very close to 100mph. We also shot
for that number and hit it right on!
Out of all the differences between the props the one that I cannot put a
number to, but the seat of my pants and the size of the trees on the shoreline
attest to, is when the floats break water this prop really keeps pulling.
Hard!
And last but not least unlike the warps It looks like a real prop!
So at this time the only complaint I have is the wait I had for the prop.
It is better than I hoped for in performance!
Cost? 1775.00
More to come, but I'm going flying, so see ya later!
Curt N97MR
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