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cd001633(at)mindspring.co
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 Posted: Mon Jul 16, 2012 3:17 pm Post subject: Flight Review Video - WhirlWind Aviation 3-Blade Propeller |
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Mark,I'm on the road on business and will look at my propeller data sheet when back in miami. If I recall correctly Whirlwind indicated that the limiting element is not the blade but the hub - I believe this would be the case with the other manufacturers also. If you fly hard airshow or competition aerobatics, the 250 hours / 1 year would definitly make sense.
I see your point but with the type of flying I do, formation and moderate aerobatics, I'm not real concern about the reliability of the hub.
The nearly 1000 hours I have on their hub on my older prop (same) gives me good confidence that it 'll work tomorrow too... 
Sam
Sent via the Samsung Galaxy S™ II Skyrocket™, an AT&T 4G LTE smartphone.
-------- Original message --------
Subject: RE: Yak-List: Re: Flight Review Video - WhirlWind Aviation 3-Blade Propeller
From: "Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E" <mark.bitterlich(at)navy.mil>
To: yak-list(at)matronics.com
CC:
--> Yak-List message posted by: "Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E" <mark.bitterlich(at)navy.mil>
Sam, I am curious.
When I go to their web page:
http://www.whirlwindaviation.com/props/400cmseries.asp
Under "Specifications" I see this:
"Tear Down Inspection: 250 hours or 1 years"
In the owner's manual I find this statement:
"7.1 Teardown Inspection Schedule
Refer to the original propeller data sheet for recommended
teardown inspection schedule. If the original data sheet
cannot be found, please contact Whirl Wind Aviation directly
to confirm the recommended schedule for your propeller."
So, it appears rather vague to me just what the tear-down schedule is when approached by a new potential buyer such as myself.
Do you have a copy of the "original propeller data sheet" that actually gives the recommended teardown inspection schedule? Recommendations by owners are of course welcomed at all times, but all props have some kind of official life history inspection schedule. Of course, anyone can contact Whirlwind directly for a verbal answer, but I sure would like to see something in writing.
Best Regards,
Mark
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mark.bitterlich(at)navy.m
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| Posted: Tue Jul 17, 2012 7:13 am Post subject: Flight Review Video - WhirlWind Aviation 3-Blade Propeller |
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Sam,
Understood on how the type of flying impacts the reliability of propellers.
What I am honestly interested in is the written information that relates to the tear down inspection intervals recommended by the manufacturer officially and in writing for either the blades, and/or the hub, both of which I refer to as "the propeller".
You also said: "If you fly hard airshow or competition aerobatics, the 250 hours / 1 year would definitely make sense."
What defines "hard" air show aerobatics? Are we talking gyroscopic maneuvers? Are we talking snap rolls? Just what exactly? Competition Aerobatics spans the realm from Sportsman, to Unlimited with a wide margin in the middle.
Whirlwind obviously must have a set policy where some inspections might be "required" and some might be "recommended".
What I am looking at here is a pretty hefty price tag if you purchase the blades, required hub, and ..... does it also require a different prop governor?
In any case, before I plop down 15-18 K$ on a new prop assy., I'd like to read the fine print. Not trying to put anyone on the spot here, I just think the original question is apt, and I am still not quite sure of the answer.
Best Regards,
Mark
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