Ultramagic Balloons MV series / The Racer

In 1996 Ultramagic made a step forward in the world of competition ballooning - MV series (The Racer). This was the first time that a balloon had been designed, developed and produced especially for the demanding requirements of balloon competition. The goal was to produce a balloon with such a shape so as to perform the maximum rate of ascent and descent whilst avoiding deformation of the envelope, thereby improving the precision on approaching the target.

Safety was also an important factor in the design equation with clear windows and Ultralast fabric on the top of the balloon being part of the standard specification. The final design and shape was the result of considerable development work with a great deal of testing and then analysing precise flight data. Many test hours were logged both by Uwe Schneider as well as Josep and Carles Llado Costa who all fly competition with a passion.

The Racer has been produced so far in 3 sizes to suit all pilot and competition task requirements. These sizes are 56, 65 and 77,000 cu ft.

24 vertical load tapes, Full 1.5m height Nomex base, choice of 22 standard colours. Ultralast fabric to parachute and top 5 panels as standard. 6 clear windows as standard. Scoop as standard. Deflation system: Parachute.

Optional: Extra Ultralast fabric, special colours, Fast deflation System (FDS) and 6 extra clear windows.

The Racer Story - by Uwe Schneider

"I flew the most slimline, because in my experiments I found out, that not the shape nor the diameter of the envelope have a big influence on the climb and decend rate of a balloon but the height of the envelope. We sat down at the design computer and Josep streched their standard 65 by 5%. It was not much difference. He did 10%, then we skipped 15 and streched it by 20%.

Then he reduced the volume to get back to a 65 and put one image on top of the other. The result was 2 m less in diameter and almost 4 m more in height. I told them that this was a shape I would try to test and they built it. I flew it for the 1st time at the preworlds in Japan. The "racer" performed very good in climb and decend. At the beginning, coming from a "normal" shaped balloon I felt I needed more concentration to fly it but soon I realised that it was showing exactly the same response as a normal balloon of the same shape. The only difference was the rate of climb and decend. It was just 30% more what I read on the instrument, but the interval of burning to keep it steady in the air as well as the length of burning to recover it after a while not heating was almost the same. So I told all pilots testing it not to look on the instrument but just flying it by the feeling, that helped. Of course, flying it level just above the ground requires a little bit more concentration, but I got used to it after 1 or 2 flights.
I developed a testing method for the performance of balloons with an electronic instrument including a barograph. After a flight I downloaded that data and evaluated it. There were several data: The max. variometer reading which was usually far higher than all other (so I didn't use it). Then on the variograph there were some peaks in the rate of climb and descend rate. I got this as an "instant" value. Then I went to the barograph which has a minimum time scale of 1 minute. So I took the altitudes at the crossing of the 1 minute bars and divided the difference by 60 getting the meters per second for a steady climb or descend of 60 seconds. The last measurement for me is the one I use to evaluate envelopes. I tested all balloons since I fly the racer and have quite a useful list. In addition I brought the balloon into a controlled cold descend from high altitude (4 m/s respectively max. descend rate with envelope in full shape). When crossing a round number on the altimeter I switched on one burner and left it running until the variometer went to zero descend. That "altitude difference necessary to recover from cold descend with one burner" is a value of comparison of burners as well as for envelopes.
 
After having tested the racer 20% I asked UM to build a 25% in order to see if it would be even more faster or if the "bottle effect" would increase i.e. the balloon will spin at higher climb and descend speeds and the mouth will close at high descend rates. The result was that the racer 25 was showing almost the same figures as the racer 20. For me this was an indication that with the "shot" of 20% we almost hit the optimum which maybe in between 20 and 25 and afterwards (30%) it will decrease."

MV-56
Volume: 1.590 cu.m / 56.000 cu.ft
Diameter: 13,8 m
Height: 17,3 m
Persons: 2

MV-65
Volume: 1.850 cu.m / 65.000 cu.ft
Diameter: 14,7 m
Height: 18,6 m
Persons: 2 / 3

MV-77
Volume: 2.200 cu.m / 77.000 cu.ft
Diameter: 15,5 m
Height: 19,8 m
Persons: 3 / 4