Random Wind Tunnel and Smoke Pictures Thread

[Piotrsko]

There are tailwheels capable of decent prolonged speeds. You're pretty much showing the small slow aircraft versions which might hit 50 mph for maybe a moment before the plane takes off with the tail up off the ground. The Long EZ- Quickie bunch use some version that is capable of 100mph but once again only during take off/landing and uses a standard 6 ply rated aircraft tire at relative high pressure with roller bearings.

I had commented that I saw no hinge seam, and was wondering how they articulated the rear truck assembly if the unit didn't pivot.

[freebeard]

Originally Posted by aerohead

I was able to engineer an apparatus which allows for full articulation, in pitch, yaw, and roll, without any interference, while maintaining the gap closure in straight-ahead driving.

I've been looking at

Adam Savage Geeks Out Over EVA Foam Scale Maille!

.

Articulated compound-curve structures are possible, knitting together laser cut metal strips. Arcimoto (for instance) have a laser cutter big enough to cut 8x10ft sheets.

[aerohead]

Originally Posted by freebeard

1) intermittent contact

2)On the end of a spring steel leaf?

3)Mecanum_wheel

1) implies that on a railroad crossing, the trailer would be incapable of terrain following, and would remain 'lifted' off the ground, a cantilevered structure, perhaps eleven feet long. An unnecessary structural attachment requirement for a trailer which has a 150-pound maximum weight.
2) No steel is used in the trailer, except for the hitch socket. A 'composite' leaf (snow-ski ) is okay. Composite coil-spring is better.
3) The mecanum wheel still has 'diameter' issues. On I-70, west of Denver, Colorado, you'll encounter frost-heaves and moguls which would require instantaneous accelerations from zero-to- 102- feet/ second, on rough concrete or patched asphalt, with solid 'tires' with no give, and, say, only 50-mm diameter. I don't don't think they'd have much of a lifespan.

[aerohead]

I'm pretty much set on using composites. Once out of the autoclave, de-bagged, and through a trim fixture, they'd essentially be ready for assembly, requiring no additional processing.
There's already a market for new product, from recycled composite refuse.
Low mass is the target. 4.321- ounces / square-foot, ovoid, stressed-skin monocoque body, with bonded composite structural hard-points, suspension, wheel, etc..
I don't recognize a better option.

[aerohead]

Originally Posted by Piotrsko

There are tailwheels capable of decent prolonged speeds. You're pretty much showing the small slow aircraft versions which might hit 50 mph for maybe a moment before the plane takes off with the tail up off the ground. The Long EZ- Quickie bunch use some version that is capable of 100mph but once again only during take off/landing and uses a standard 6 ply rated aircraft tire at relative high pressure with roller bearings.

I had commented that I saw no hinge seam, and was wondering how they articulated the rear truck assembly if the unit didn't pivot.

1) an 'integrator' attaches to the aft of the tow vehicle. ( gap-1 )
2) the front of the gap closure attaches to this. ( gap-2 )
3) the aft of the gap closure attaches to the trailer front. (gap-3 )
4) the trailer articulates in pitch.
5) the trailer articulates yaw.
6) the trailer does not articulate in roll. ( no load asymmetry from a single wheel )
7) the wheel is independently suspended within its full aerodynamic fairing.
8) 10-kilograms are on the hitch.
9) 128-pounds are on the trailer axle ( 58-kg )

[ennored]

Couple cool images in a video about the next generation NASCAR Chevrolet like the one attached.

https://www.youtube.com/watch?v=VLSr...nnel=Chevrolet

[aerohead]

The increased ground clearance and diffuser implies a belly pan, to support clean, source flow, a dramatic departure from all previous NASCAR race cars.
And less rear spoiler is required with a diffuser in place. Free horsepower!
If lower overall drag is the result, NASCAR can impose restrictor-plates to limit power and top speeds. Speed kills. And this racing is about family entertainment.
Pit stops might still be governed by tire life, however, mpg may be impacted enough that 'fuel management' strategy becomes less critical for the teams.
Once, a rookie driver took the checkered flag, coasting through corners to conserve fuel, perhaps allowing for one less pitstop than other drivers. Something Danaka Patrick would later find to be a critical race strategy in Indycar racing.

[freebeard]

"This is the future. And it's 120 years old."

https://www.youtube.com/watch?v=v9o61j7Pbeo

Not even the first. That was in the Blue Hills of Kentucky. One in 20 blockage ratio.

[kach22i]

Lucid-Air
https://www.greencarreports.com/news...ent-luxury-car

[Piotrsko]

Ok I will bite: why is the first picture showing the smoke trail from behind the vehicle which is then related to possibly a different light show conception of airflow.