To:   "'JamesRTeeters@compuserve.com'", JamesRTeeters
From: "Pallard, Robert", INTERNET:Rob.Pallard@nrc-cnrc.gc.ca
Date: 10/19/2003, 10:49 AM
Re:   IMS Heavy Displacement Series
 
 
 
Dear Jim,
Please find attached a .tnk file which summarizes the results of the tests
with M2 appended. This test has been a challenge because of the problems
that we have had with calibrations. Some of the problems were traced to bad
extension cables. For a while, I really thought that we had a roll force
cell going bad but the problem seems to have gone away since we moved to
another channel. On the face of it, had someone shown me the channel
calibrations for the two channels that were used for this instrument as a
blind check, I would still pick the original one. Guess that shows how much
I know. 
In the end, we found ourselves, yet again, using the dynamometer and its
calibration procedures to prove that there was something wrong with an
instrument, the acquisition system, that should have been an order of
magnitude better that the dyno. 
I regret to say that the test does not give Caroline or myself as great warm
feeling. The repeats at the low speeds (Fr=0.250 and 0.325 in the yaw
sweeps) compare reasonably well with the data obtained during the zero
leeway speed sweeps but Fr=0.400 was problematic with drag variations of up
to 3%. I can recall that this speed where CT is climbing quickly was an
irritant in an AC campaign but Caroline doesn't recall that sort of specific
with her  AC tests.
The problem may be related to wait time. The wait time scheme is based on
model speed and leeway, so when you use a smaller (slower) model that is
heavier than your wait time database model you might be pushing too hard.
Again the curious thing is that the low speeds repeated fairly well.
 
Re-analysis of the M1A dataset is complete so it will follow shortly.
 
Best Regards
Rob <<m2a.tnk>> 
 
 
 
 
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From: "Pallard, Robert" <Rob.Pallard@nrc-cnrc.gc.ca>
To: "'JamesRTeeters@compuserve.com'" <JamesRTeeters@compuserve.com>
Subject: IMS Heavy Displacement Series
Date: Sun, 19 Oct 2003 12:19:26 -0230
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