At 11:12 AM 23/09/03 +0930, you wrote:
>Unfortunately it probably won't be this miraculous. The 19% drag reduction
>is only for the profile drag from the wing (and may be pretty optimistic too
>for a Cirrus). Depending on the glider, the wing profile drag is around 40%
>of your overall drag at your best L/D. They quote a best benefit for a 15m
>sailplane to be only 7% at most at Best L/D which is consistant with the 40%
>mark.
>
>When I last read standardcirrus.org they were quoting 3-5% performance
>improvement with turbulators (consistant with ~13% drag reduction of the
>profile drag of the wing). So at best Dr. Sinha has developed a 'low drag'
>turbulator strip which will get you another few glide points.
>
>I will be interested to see how Dr. Sinha's turbulator film handles the
>change in transition point with different speeds.
This came up on r.a.s. a few months ago and there was some opinion it was
snake oil. I tried the link to email Dr Sinha and the message was unable to
be delivered.
There is an article in Flight Safety Australia this month about something
similar. As I understand the Sinha device it isn't a turbulator but is
designed to delay the transition to turbulent flow without then causing a
laminar bubble.
There isn't much detail to really tell. I note the Oxford Aero people
aren't actually selling it yet either.
Mike
Borgelt Instruments - manufacturers of quality soaring instruments
phone Int'l + 61 746 355784
fax Int'l + 61 746 358796
cellphone Int'l + 61 428 355784
Int'l + 61 429 355784
email: [EMAIL PROTECTED]
website: www.borgeltinstruments.com
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