Random Aerodynamic Oddity of the Day Thread

[freebeard]

Like I said, I see a little Colani in the overall shape.

The door cut-line and retractable headlights are.... unfortunate. But I wonder where that windshield was sourced from.

Better?


Just A Car Guy: the Pontiac Vivant

Pontiac engineer Herb Adams...built the car as a hobby project in 1965 with inspiration from the Alfa Romeo B.A.T. concept cars of the 1950s.
....using Pontiac parts sourced from a junkyard, including a Tempest transaxle, full-size Pontiac Bonneville alloy eight-lug wheels, and a Pontiac 370-cu.in. V-8.

[cRiPpLe_rOoStEr]

Notice the different locations of the intercooler, and I guess this speaks for itself...

[freebeard]

So, who had the first high-bypass turbofan?



The Zeppelin Reborn: LZ-130

A shaft-driven turobfan helped rush that airflow out with such velocity as to produce some forward thrust, said to be enough to overcome the drag penalty. (Some might suggest this was the first hi-bypass turbofan.) The multi-stage cooling of the water-bearing exhaust stream had the extra beneficial effect of quieting the powerplants, and of course goes without being published, greatly reduced the free electrons found the exhaust stream. Sadly, in spite of designed-in screens, it would have eventually been clogged with soot, remembering the ZRS condensers’ rather tedious cleaning process.... However temporarily the blend of Ruhrchemie’s synthetic gas oil with 13.5% hydrogen would, if the air temperature and humidity were cooperative, produce 1 kg of water for every kg of fuel consumed.

The whole gondola was a wind tunnel to cool the exhaust to reclaim the weight so they didn't have to vent lift gas.

I always thought the Graf Zeppelin was more graceful than the chunkier Hindenburg.

[kach22i]

Originally Posted by freebeard

The Zeppelin Reborn: LZ-130

Nice link.

adopting the low-sulfur “Kogasin Diesel,” with the added hydrogen, sweetened the recovered water to the point it did not quickly corrode the condensers, piping and storage tanks.

[kach22i]

All Things Aviation Related - Page 21 - Pelican Parts Forums

Originally Posted by dar636

The perfect winglet installed on a Falcon 50. Unfortunately it can't be produced or installed economically. It did prove the concept though.

[freebeard]

The perfect winglet installed on a Falcon 50. Unfortunately it can't be produced or installed economically. It did prove the concept though.

Imagine what it would cost with cold plasma control surfaces.


http://justacarguy.blogspot.com/2019...s-banners.html

[Piotrsko]

I am at a loss for what they actually accomplished with those tips, other than they are big ugly surfaces behind the C of G

Intersection drag has to be doubled, twisting the tip up at speed, maybe a bit of tip vortex reduction.

[kach22i]

Hypersonic Technology Demonstrator Vehicle
https://en.wikipedia.org/wiki/Hypers...trator_Vehicle

Israel has provided some assistance on the HSTDV program, including wind tunnel testing, as has Cranfield University of the U.K. An unnamed third country is helping as well. According to a report, Russia has provided critical help in the project. India's main defense-industrial partner is Russia, which has carried out considerable research into hypersonic propulsion.

The leading edge of the above might be plasma, although I don't see where it says so.

In any case, it does not look very aerodynamic compared to the aero-template that is based on 1930's Zeppelin airships.


Ayaks
https://en.wikipedia.org/wiki/Ayaks

Plasma sheath

As altitude increases, the electrical resistance of air decreases according to Paschen's law. The air at the nose of Ayaks is ionized. Besides e-beams and HF pulse discharges, a high voltage is produced by the Hall effect in the MHD generator that allows a planar glow discharge to be emitted from the sharp nose of the aircraft and the thin leading edges of its wings, by a St. Elmo's fire effect. Such a plasma cushion in front and around the aircraft offers several advantages:[35][36][2]

The ionized air becomes electrically conductive, which allows the MHD generator to work and decelerate the flow down to the air-breathing jet engines.

The MHD-controlled inlet ramp allows to vector the flow as a shock-on-lip without physical inlet cones.

Electric charges mixed with the fuel increase the combustion effectiveness.

The bow shock wave is detached further ahead of the aircraft, the energy deposition in this region acting as a virtual blunted nose, although the nose stays physically very sharp. This minimizes the heat flux on materials.[35]

The temperature gradient in the air is locally modified, hence the speed of sound value, which mitigates and softens the shock wave. This lowers thermal effects on materials further, as well as the wave drag.[37][38][35]

The plasma cocoon surrounding the whole aircraft gives plasma stealth. Combined with hypersonic speeds and maneuverability, such a platform would be very difficult to detect, track and target.

[gumby79]

Originally Posted by Piotrsko

I am at a loss for what they actually accomplished with those tips, other than they are big ugly surfaces behind the C of G

Intersection drag has to be doubled, twisting the tip up at speed, maybe a bit of tip vortex reduction.

You got part of it.
Wing tip vortex reduction less drag,
Lift,.
Thrust?
There was a car on hear that had an airfoil spoiler that was more round, that produced forward thrust

[Piotrsko]

Im familiar with shape producing thrust, ala NACA cowl of the 1930's. I was around when Boeing looked at our experimental glider wing tip mods they use today.

This just looks excessive. Maybe if the provide some decent data?