This WEB site is dedicated to describing the building of a Cumulus motor glider prototype conversion from gas to electric propulsion. The project could eventually result in production electric aircraft.
The Cumulus is a kit produced by Ultralight Soaring Aviation. The electric propulsion Cumulus is a product of Quantum Associates and is expected to have the following Characteristics:
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Cumulus Motor Glider Dimensions | |
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Wing Span |
43 ft (13.1m) |
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Wing Area |
140 sq ft (12.7 sq m) |
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Aspect Ratio |
13.1:1 |
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Weight |
350 lbs Empty /Gross Weight 640 lbs |
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Useful Load |
290 lbs |
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Length |
20 ft/Height 4.5ft |
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Cumulus Motor Glider Speeds | |
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Max Speed(Vmax) |
90 mph |
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Cruise Speed Range |
35-70 mph |
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Stall (best flaps) |
32 mph |
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Cumulus Motor Glider Performance | |
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Best Sink Rate |
190 fpm @ 34 mph |
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Best Glide Angle |
20:1 @ 43 mph |
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Rate of Climb |
1000 fpm, max |
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Range |
1.5 hours with 3 to 4000 watt-hour batteries |
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Takeoff Roll |
250 ft |
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Roll Rate |
4.5 sec |
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Cumulus Motor Glider Structure | |
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Limit Load |
+4.4/-2.0 G min |
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Wing/Tail Cover |
Aluminum |
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Airframe |
4130 chrome-moly steel |
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Wing Loading
Batteries |
4.56 lbs/sq ft
550 A123 cells (ANR26650 M1a) |
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