The magnification of the sideslip angle effect is to do with the shape of the fuselage / canopy and the airflow around it. It has nothing to do with the boundary layer. The effect will taper off as you get further from the fuselage but will still be noticeable out to a fuselage diameter or so away from the fuselage surface.
The same effect applies to the angle of attack probes on larger aircraft. These are all calibrated for their position on the fuselage and the calibration factor typically ranges from 1.6 up to 2. Regards Anthony From: Mike Borgelt [mailto:[email protected]] Sent: Thursday, 17 January 2019 10:26 AM To: Discussion of issues relating to Soaring in Australia. <[email protected]> Subject: Re: [Aus-soaring] slip in thermals? Yes, I've seen that article, Erich. A couple of months ago we ran a flight test of the theory that the string in the boundary layer amplified the actual sideslip. Taped a bent paperclip with a second string 25mm above the normal one. The boundary layer a couple of feet from the nose is quite thin so this should have got it outside the layer. Nope. Strings seemed to move together. Need to do this again with several strings at different heights. The flow disturbance may extend much further from the surface of the nose. Mike At 09:36 AM 1/17/2019, you wrote: Hello Mike, is this article useful? http://www.wisoar.org/Documents/Holighaus%20-%20Thermalling%20Efficiency.pdf ta Erich On Thu, 17 Jan 2019 at 07:16, Mike Borgelt < [email protected] <mailto:[email protected]> > wrote: When circling in a thermal, do you a) keep the string centered b) fly with it pointing to the outside of the turn c) why? Your technique may not be doing what you think it is. Mike Borgelt Instruments - design & manufacture of quality soaring instrumentation since 1978 www.borgeltinstruments.com <http://www.borgeltinstruments.com/> tel:Â Â 07 4635 5784Â Â Â Â Â overseas: int+61-7-4635 5784 mob: 042835 5784Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â :Â int+61-42835 5784 P O Box 4607, Toowoomba East, QLD 4350, Australia _______________________________________________ Aus-soaring mailing list [email protected] <mailto:[email protected]> http://lists.base64.com.au/listinfo/aus-soaring _______________________________________________ Aus-soaring mailing list [email protected] <mailto:[email protected]> http://lists.base64.com.au/listinfo/aus-soaring Borgelt Instruments - design & manufacture of quality soaring instrumentation since 1978 www.borgeltinstruments.com <http://www.borgeltinstruments.com/> tel: 07 4635 5784 overseas: int+61-7-4635 5784 mob: 042835 5784 : int+61-42835 5784 P O Box 4607, Toowoomba East, QLD 4350, Australia
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