At 08:09 AM 23/10/03 +1000, you wrote:
>Heard Bert Persons has put golf ball dimples on the "top" surface in a
>certain area of a prop and it performs better and they use Z tape on
>helicopters. Where will it end!
>Ian McPhee
>Box 657 Byron Bay NSW 2481 Australia
>Tel +61 (0)2 66 847 642 Mob +61 (0)428 847 642
>[EMAIL PROTECTED]
>www.mrsoaring.com
Not too surprising. Either there are laminar bubbles or the turbulators are
energising the turbulent boundary layer and preventing premature flow
separation(latter more likely I think).
There are aftermarket vortex generator kits for many power planes including
light twins. In that case they can sometimes get a weight increase where
the weight was limited by single engine performance due to lower Vmca
caused by better rudder effectiveness with turbulators ahead of the hinge
line or lower stall speed. Some light twins aren't required to fly on one
engine only meet the same stall requirements as singles(61 knots) and have
the single engine performance on a standard day at 5000 feet gross weight
tested and documented.
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
--
* You are subscribed to the aus-soaring mailing list.
* To Unsubscribe: send email to [EMAIL PROTECTED]
* with "unsubscribe aus-soaring" in the body of the message
* or with "help" in the body of the message for more information.
