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bakerocb
Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA
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 Posted: Sat Jun 19, 2010 7:43 pm Post subject: Air Flow Tuft Testing |
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6/19/2010
Hello Scott, Congratulations on a successful first flight.
You wrote: "I need to tuft the wing root fairings and the bottom of the
elevator when I have a chase plane and see if there is separation at high
AOA."
I think that you will be essentially wasting your time using visual
observation from a chase plane to interpret air flow by yarn tufts. You will
get a simple one word answer to the question "........see if there is
separation at high AOA". That answer can already be predicted as "Yes". But
just how much separation and where will require a more extensive data
gathering method.
I say this after watching on a DVD an extensive amount of KIS TR-1 air flow
tuft testing done by Julian Bone. The results were very interesting and
useful because he gathered the data by means of video cameras mounted on his
plane. This meant that the data could be gathered relative to different
airspeeds and analyzed over and over .
See attached still picture.
It would be extremely unlikely that you could get any comparably useful
results from the visual observation of a crew member in a plane flying
formation with your plane. As an expediency you might want to try to equip
that crewmember with a zoom capable hand held video camera to see if that
would provide some useful data.
Take care when flying two planes in formation at high AOA.
'OC' Baker Says: "The best investment we can make is the time and effort to
gather and understand knowledge."
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bakerocb
Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA
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| Posted: Sun Jun 20, 2010 3:15 am Post subject: Air Flow Tuft Testing |
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6/20/2010
Hello Scott, Not that I know of.
Julian sent me a DVD of his air flow tuft testing results with the
suggestion that I share it. I spent a few hours trying to duplicate it on my
home computer so that I could share it, but could never get any of my
supposed duplicates to work.
Right now the DVD is loaned to a fellow pilot who I checked out in my KIS
TR-1. When I get the DVD back I'll make another attempt to get it duplicated
with some outside help. If I succeed I'll let the group know and make copies
available.
'OC'
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