Hey Cliff we are talking about the government remember... LOL
We shall not cease from exploration.
And at the end of all our exploring
Will be to arrive were we started
And know the place for the first time - T. S. Eliot
Steve Roberts - AA-1B N641HY @ ILG
----Original Message Follows----
From: "flyv35b" <flyv35b@minetfiber.com>
To: <teamgrumman-list@matronics.com>
Subject: Re: re:cowling update
Date: Wed, 3 Sep 2008 06:02:28 AM PDT
I think where the ball got dropped is that the FAA should have outlined and
specified what tests were required at the beginning of the program. Not
done it piecemeal and at the last minute said "oh, by the way, you need to
do a climb test"! Although they can do this, it isn't the way they are
supposed to handle these STC programs. You should have been notified about
this test requirement a long time ago and the test could have been
incorporated with the cooling climb test.
Cliff
----- Original Message -----
From: teamgrumman@aol.com
To: teamgrumman-list@matronics.com
Sent: Wednesday, September 03, 2008 12:43 AM
Subject: Re: re:cowling update
Climb performance is more of a function of excess horsepower and weight
than drag. At Vy, induced drag is more of a player in overall drag than is
parasitic drag. Induced drag would be more of a function of airfoil design
than cowling design.
The questions should be:
(1) do any of the planes climb at book values?
(2) what prop was used for the book values? 61 inch, 62 inch, 63 inch,
64, inch or 65 inch pitch?
(by-the-way, the POH has climb performance for various weights, not just
gross weight)
(3) what were the conditions under which the tests were performed.
i.e., were the numbers in the POH
A. extrapolated from a continuous climb at Vy to various altitudes?
B. evaluated for climb rate from a stabilized level flight condition and
a maximum airspeed
to a specified altitude then re-stabilizing level flight and repeating?
Why am I surprised? The only issue should be if I increased the drag on
the cowling then climb performance would come into question. A more
indicative test would be fuel flow at various altitudes and airspeeds. A
test like this would indicate if the cowling affe cted the overall drag.
-----Original Message-----
From: ski2little@aol.com
To: teamgrumman-list@matronics.com
Sent: Tue, 2 Sep 2008 4:09 am
Subject: re:cowling update
Not surprised FAA requires a climb test - presumably to confirm the plane
can still climb at least as well as stock plane - at gross weight. I'm more
surprised this was a surprise.
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