Note: Windings burned out on Astro after 4 flights. Although the same set-up had been used successfully in the Sukhoij, I just couldn't get enough air through the Cub cowl to take the heat away.

Ultra motor worked well, but was taken out for use in the MiG 3 and replaced with Kontronik setup, liberated from crashed Logo 10 helicopter.

Astro

Ultra

Kontronik

Airframe

Wingspan

82.7in

82.7in

82.7in

Weight

8lb 0oz

8lb 8oz

8lb 0oz

Wing Area

850sq ins

850sq ins

850sq ins

Wing Loading

21.7 oz/sq ft

23 oz/sq ft

21.7 oz/sq ft

Power System

Motor

Astro 15 with Superbox (3.69:1)

Graupner Ultra 1300/12

Kontronik Fun 600-15 with MEC Superbox (3.125:1)

Battery

4 x 3700mah LiPo

5 x 3700mah LiPo

5 x 3700mah LiPo

Propeller

14" x 10"APC Electric

12.5" x 6"Graupner Cam

13" x 6.5"APC Electric

Performance

5600rpm at 29amps

9200rpm at 28amps

8000rpm at 26amps

Power loading

56W/lb

58W/lb

57W/lb

Calculated Thrust

4lb 14oz

5lb 10oz

5lb 6oz