They used to have an instrument called TOTO. But it was ground based. They would put it in the path of the tornado to get measurments. We have a few guys at our field who are experimenting with using RC planes to take upper air measurements. They
send the plane up on a balloon. The plane is then released and on the way down it takes measurements and uses a GPS system
to fly itself back to the pilot.

The sig cap that you have...I would rate it as a 6 on a scale of 1 to 10 as far as its ease of performing 3D. If you ever come across one
the Hanger 9 27% or 80" cap with the alitalia scheme is a much better 3D plane. It is even more stable in upright harrier than the sig one. No wing rock whatsoever. It is easier to torque roll and performs many other 3D maneuvers as well as a 35% plane. Problem is H9 stopped producing them because of poor sales due to the 80" wing span. I would rate this plane an 8 or 9 out of 10.

Greg