High speed prop

[Mike Kimball]

Regarding the prop spinning 3300 RPM, I was very pleased with the Warnke
"Almost constant speed" wooden prop that I used on my KR-2 years ago,
turning about 3200 RPM max. Added benefit - it was very nice looking. Side
note regarding an old rumor - I have flown in rain, heavy at times, many
times behind good wooden props with no sign of damage. I think it's
possible the wooden prop versus rain problem may be from times past and
maybe sealers, coatings, and leading edge protection weren't quite as good
as they are now.

Mike
044SR

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Ron
Shannon
Sent: Monday, December 11, 2006 9:32 AM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Engine Choices

Charlie,

I'm installing a Jabiru 3300 in 254R, to be certified as an amateur
built experimental (ABE) LSA. My reasons for selecting the 3300 were
conventional design, engineering simplicity, lightweight, good rep, etc.
Due to weight considerations, the only other serious contender for me
was the Rotax 912 ULS which, although it is a little lighter, also has
lower max HP, at least as rated. Although many good folk do swear by the
912's reliability, and they may well be right, it is a more complex
design (dual carbs, gearbox, plumbing, outboard oil sump, etc.)

There has been considerable discussion on this list about issues with
prop selection with the Jabiru 3300, due to its relatively high tip
speeds at its max power, direct drive 3300 RPM. While I don't want to
reopen that debate, at Oshkosh '06 I did find the folks from Legend
Aircraft were very happy with a Sensenich W68CK38 wood prop on their
3300-powered LSA Cub knockoff. After discussing the issues with
Sensenich engineers at length, I decided to get a W68CK38G (with
composite covering) for 254R. Though it's not flying yet, I'm expecting
it will perform well.

BTW, when comparing engine weights, be sure you're comparing apples to
apples, i.e., weight with all accessories -- or not. The 3300 with
starter, alternator, regulator & complete exhaust system, etc., is about
175 lbs.

Ron
254R
http://n254mr.com



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[Alvin and Glenys Adams]

Mike & Drew.

I flew my new prince prop in moderate rain 3 different occasions for approx, 15 minutes each time.First time a little wear,2nd time a little more,3rd time i have to send prob back to prince for repairs.Running 2450.Not happy with prop at all.
Strange yours is ok in Rain & mine is not.Any othes have experience with prince prop in rain.


Alvin R776

Gander NL. Canada



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[eric.r]

Curious; is your Prince the carbon fiber P-tip with the leading edge
protection? I ask because that is what I have (not yet installed on my
varieze) and am concerned about rain damage. I found (on helicopters) that
nothing bulletproof has been invented yet to stop rain abrasion.
Building a rebel on amphibs, I too will be prop shopping soon.

On 12/12/2006 3:58 PM, gander.electrical@nf.sympatico.ca wrote to rebel-
builders-d:

-> Mike & Drew.
->
-> I flew my new prince prop in moderate rain 3 different occasions for
approx, 15 minutes each time.First time a little wear,2nd time a little more,3rd
time i have to send prob back to prince for repairs.Running 2450.Not happy
with prop at all.
-> Strange yours is ok in Rain & mine is not.Any othes have experience with
prince prop in rain.
->
->
-> Alvin R776
->
-> Gander NL. Canada





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[Alvin and Glenys Adams]

Gooday Eric:

My Has the P tip with leading edge protection suposeitly



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