https://www.thethermograpiclibrary.org/index.php/Hot_air_balloon
Thermography of a filled and ready to go hot air balloon.
Now I would wish to see the image of the same balloon when rotating.
Hot air balloons sometimes use rotation vents (see below). Would the (low) rotation speed be sufficient to see if the colder layers are against the walls inside, and after how long, and at what speed of rotation?
ROTATION VENTS
Rotation vents enable the balloon to be turned so that it is correctly orientated for landing. When flying a partitioned basket or one with a door , rotation vents are mandatory.
That said, the measurements would be distorted because of temperature exchanges due to the vents.
The temperature in a hot air balloon is far higher (about 70 to 100 degrees more in relation to the outside temperature) than that of the intended Magnus effect-based balloon (2 to 10 degrees according to the dimensions of the balloon). This must be taken into consideration. Perhaps also the horizontal axis of rotation of a Magnus effect-based balloon leads to some differences.
As I mentioned above the static mode would be required to keep the benefit of insulation by the rotation, above all if along time is necessary to achieve it. Flettner balloon and VAWT side by side leads to a static (stationary) operation. If the results are better known, some designs of hot air with central heating cables could be introduced in the designs mentioned in the preprint Vertical axis wind turbine(s) connected to Flettner or Sharp balloons, avoiding helium or hydrogen and their respective issues.