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copied from: http://www.gregcovey.com/Glow_Conversions_Made_Easy.htm

.20-size glow engine / 300w electric motor
- (OS Max 0.20 engine develops 0.4 hp = 300 watts electric motor (2820))
.35-size glow engine / 500w electric motor
- (Fox 0.35 stunt engine develops 0.7 hp = 522 watts electric motor) (2826)

.40-size glow engine develops 1.0 hp = 750 watts electric motor (2826 or 3520)

.46 size glow develops 1.1hp = 800 watts electric motor ( 3520)

.60-size glow engine develops 1.3h.p = 975w electric motor (4120 or 4130)

.90-size glow engine develops 1.6h.p = 1200w electric motor (5320 or 4130)

1.20-size glow engine develops 3.0h.p = 2250w electric motor ( 5330)

DA-50 develops 5 hp = 3750w electric motor ( 5330)

DA-100 develops 9.8 hp = 7311w electric motor (Double 5330)