along with picking up a lunch tab once in a while and he's happy to lend me
his specialty tools like tach checker, differential pressure tester and
hose fitting mandrels. I just changed all my firewall forward hoses and all
it cost me was the price of the hose itself.
At 05:59 AM 8/29/2006 -0800, you wrote:
syncOr take the metronome off the piano, set it to 60 and blink your eyes in
of 60.with the metronome ... too many engineer types on this thread!
On 8/28/2006 7:59 PM, mkimball@gci.net wrote to rebel-builders:
-> I know the "check the tach" comment was a joke but it reminded me of a
-> quick, easy, cheap way of checking the tach on my Piper Arrow ages
ago. My
-> tach was placarded as reading 100RPM low and I was curious. I put some
duct
-> tape on the back of one of the blades on my two blade prop, waited for
night
-> to fall, then put the airplane near a light on a building with the tail
-> facing the building. In the US AC power is supplied at 60HZ so if my tach
-> is accurate, the blade with the tape will appear to stop at multiples
flew-> So I tried 1200, and 1800 RPM and discovered that, just as my tach was
-> placarded, my tach was off by 100 RPM. The prop appeared to stop at
1100
-> and 1700 RPM. If Canada is 50Hz then just use multiples of 50. Some
-> mechanic placarded my tach as reading 100RPM low and my test
confirmed it.
->
-> Mike
-> 044SR
->
-> -----Original Message-----
-> From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
-> Rebflyer@aol.com
-> Sent: Monday, August 28, 2006 4:45 AM
-> To: rebel-builders@dcsol.com
-> Subject: [rebel-builders] New Prop
->
-> 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
Catto-> 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
durability. I-> prop. Very well known in the canard community for speed and
prop-> figured if it can take nuts, bolts and exhaust systems going thru the
cool-> 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
need to-> again! Cruise at full throttle shows 2775. 300 rpm range. I think I
That's->
-> check my tack(grin). Again in 90 deg f temps I'm indicating 115mph.
put a-> 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
pulling.-> 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
prop.-> 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
Drew->
-> 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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