09-02-2022, 06:50 AM
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#1 (permalink)
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Think Flight: Using Simple Aerodynamics to Beat High Gas Prices
Published Aug 31st. Delete if a repost.
35.64mpg to 40.52mpg
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Last edited by sheepdog 44; 09-02-2022 at 07:04 AM..
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09-02-2022, 12:53 PM
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#2 (permalink)
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I put it in "Interesting Aeordynamic..." but don't delete. It's just lost there.
What can one see from the thumbnail, that he took tuft testing to find out?
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09-08-2022, 11:23 AM
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#3 (permalink)
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what see
Quote:
Originally Posted by freebeard
I put it in "Interesting Aeordynamic..." but don't delete. It's just lost there.
What can one see from the thumbnail, that he took tuft testing to find out?
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The preliminary conclusion from the tuft study infers that both the plan-taper and diffuser angle are too extreme to protect the boundary layer from premature separation, counter-flow, eddies, and turbulence.
Also, from other reportings, the addition of rear wheel skirts and a full belly pan with diffuser would have amplified the 13.7% mpg result.
So, anyone wishing to improve on the tail would select smaller angles on the sides and bottom, for the 'second-approximation' design.
When the tufts behave as up top, you're essentially 'there.'
Additionally, if the coefficient of pressure profile were to be determined, this would be 'what you're looking for', by default.
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09-08-2022, 01:20 PM
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#4 (permalink)
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Admitedly the plan taper doesn't show in the thumbnail.
Compare the Breer high-tailed stinger vs Harry Westergard's taildraggers.
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09-08-2022, 02:08 PM
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#5 (permalink)
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Westergard
They all look too aggressive to me. Pseudo-Jaray 'fastback'. I'd bet a cup a Joe and a sugar-dum-dum that they'd suffer premature separation.
'Like the look though. 
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09-09-2022, 01:09 AM
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#6 (permalink)
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I didn't watch, but I don't think aviation is a simpler frame for aerodynamics. The entire subject is extremely complex, perhaps with a few easy to remember "rules of thumb".
As with any subject, the basics are low hanging fruit, with mastery involving lifetime dedication and proclivity.
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09-09-2022, 03:28 AM
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#7 (permalink)
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Quote:
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I didn't watch, but I don't think aviation is a simpler frame for aerodynamics. The entire subject is extremely complex, perhaps with a few easy to remember "rules of thumb".
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Same four forces, same Reynolds numbers; what better 'frame'?
He's a pilot, it's a build story with tuft testing.
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09-09-2022, 05:54 AM
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#8 (permalink)
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Meh. Laminar flow better than turbulent? Is that what thinking about flight is supposed to reveal? I still refuse to watch based on the dumb title.
Perhaps we should use simple golf ball dimples to beat high gas prices?
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09-09-2022, 01:21 PM
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#9 (permalink)
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09-10-2022, 08:27 AM
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#10 (permalink)
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Close but not quite. That would be for peening the edges of metal shafts to retain them.
You need a pick hammer to make proper dimples.
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