How to properly design a VTOL/ADAV helicopter-plane?

[Ahmed]

Admittedly, your tailor missed his shot by breaking it (sic), but other tests will follow and will be more fruitful, which explains why its development will be rapid from the moment the military officials decide to use it.
The balloonists will begin to be equipped with this device at the end of 1915 and especially from the beginning of 1916...

[gegyx]

German airmen had tried, with some success on many failures, to jump from the plane without a parachute, in deep snow.

[Remundo]

it is indeed risky... If the snow is not soft and thick enough...

[Remundo]

a short article on Automobile Propre about a consumption record (0,6 kWh/100km for 2573 km) by an ultra-efficient car.

tufasteco-record-munich-1200x675.jpeg (140.18 KiB) Viewed 1501 times

What interests me is the aerodynamic profile chosen for the car

Although the car was aerodynamically well designed, I would say that they still have room for improvement.

[gegyx]

It was a bit alpine

To do better, you need a windshield curved over 1.60m, up to the front of the vehicle?

[Remundo]

it is necessary to get closer to the half-body of least drag

Here is an example from Wikipedia:



At the rear, you have to finish at a point to match the flow lines as much as possible.

[NCSH]

In the real world, there was the DS designed in the 50s, whose Cx was then around 0.4.

It was necessary to develop square-section wind tunnels, specially dedicated to the automotive world, in which cars are tested, to gradually succeed in cleaning out all the parasitic streaks...

Currently, it seems to me that it is Mercedes which is marketing one of these heavy, ultra-profiled electric sedans. Cx of 0.21.

More than a century later to get there!

[Remundo]

the 1956 DS



combined good and bad from an aerodynamic point of view.

The big problem in my opinion is the very marked break of the windshield in relation to the front hood.

The good point is the tapered shape and plunging towards the back.

Wikipedia gives the Cx at 0,38

it's mixed. However, at the time, aerodynamic design was not as exaggerated as it is today and style/design had a strong importance.

Nowadays some models like the Mercedes EQS lowered the Cx to 0,2



This, however, sanitizes the style of the models because the aerodynamic shapes impose themselves on everyone.

[NCSH]

On this thread, you mention your contacts with the Interaction association.

I tried to contact them in December 2022 without any response from them.

What kind of firewall do they have to defend their website? An integral barrier that rejects everything?

[Remundo]

I couldn't tell you.

Christophe knows them better than me. I just carefully read several of their publications on good aeronautical design. Their site seems to have been frozen for a long time. No update.