Random Aerodynamic Oddity of the Day Thread

[kach22i]

https://www.researchgate.net/figure/...ig10_263726431

Coanda jet has also been applied in the development of novel aircrafts for short takeoff, while another circulation enhancement technique known as Trapped Vortex Cavity (TVC) is currently being given significant considerations.

Airfoil flow separation delay using trapped vortex cavity
https://areeweb.polito.it/flowcontro...ex.php/topic-2

For the success of a trapped vortex cavity effect is essential to maintain stable the vortex inside. To this end the vortical motion have to be controlled using a suitable technique. The cavity presents a porous portion of wall inside for the control of the vortex operated through a suction. Pressure distributions around the airfoil and wake analysis were performed other than pressure fluctuations inside and downstream the cavity using Kulite pressure transducers.

2014
Flows with trapped vortices
https://www.imperial.ac.uk/aeronauti...edVortices.php

Fig.3. A sketch of a feedback-control system for a trapped vortex

Stabilising the trapped-vortex flow is a challenge. Future work would aim at feedback control of such a flow, as illustrated in Fugure 3.

[kach22i]

1956, many years before Chaparral's and Lola's of the mid-1960's used giant mid-wings.

PDF on aerodynamics.
https://www.google.com/url?sa=i&rct=...75774930428738

[freebeard]

Airfoil flow separation delay using trapped vortex cavity
Flows with trapped vortices

The cavity box they test is 1/3rd the wingspan, but the structure would double the weight.

Actively managing flow separation seems expensive compared to a canard with more pitch to prevent it.

This is in my albums:

[kach22i]

Originally Posted by freebeard

Actively managing flow separation seems expensive compared to a canard with more pitch to prevent it.

Do you have a diagram or article explaining what you mean?

Sounds like you are staying with level flight and NOT increasing angle of attack at all.

Close coupled vs long arm canard
https://defenseissues.net/2014/08/23...ng-arm-canard/



PDF-1
https://www.google.com/url?sa=i&url=...AAAAAdAAAAABAK


PDF-2
https://www.google.com/url?sa=t&rct=...cheD1OL09xCwcj

[freebeard]

Pick one from here: https://duckduckgo.com/?q=stall-proof+canard+wing

I'm not sure how canards affect the short take-off part.

[slowmover]

Originally Posted by kach22i

Introducing a Comprehensive Guide to Restoring Vintage Trailers and a Party to Make it Official
https://tincantourists.com/2017/11/1...tage-trailers/



I'm not sure what I'm looking at here.

Stainless steel panels to protect from road grit (Segment protectors). Unnecessary and ugly. Like jowls on a dog. Ruins the lines.

The vertical box is the propane tanks. Which were and could still be made horizontal to fit under nose and above frame. (Below an example with the whale-sized AVION 34’ basement model; a 1989 contemporary to mine which is far lower in height but hire the tanks in body. AS once did same ).

[freebeard]

Just A Car Guy: Abrams P-1 Explorer, made just before WW2, put on hold during the war, and obsolete after the war. Created for aerial photography, the windows were the first to be formed on a compound curve in history.

[kach22i]

Just too fantastically weird for any other thread.

Random TRANSPORTATION pictures - Page 2278 - Pelican Parts Forums

[freebeard]

It's world famous: https://duckduckgo.com/?q=herkimer+battle+jitney

More odd than aero:


Just A Car Guy: stopping on a dime? A lot of things and cars have stopped on a dime. But turning on a dime, that is something far fewer cars have done

[cRiPpLe_rOoStEr]

The nose of this Magirus-Deutz is quite aerodynamic...