Description
F3A Contra Rotating Propeller Drive System for use in F3A Pattern Competition
1. The motor shaft and the middle one are made of titanium alloy.
The lightweight is better for F3A flight.
2. The plastic gear is strong enough which hardened on the surface.
3. we have tested it with this motor, it saves electricity
4. And the gear material we use oily plastic, which is wear-resistant and quiet
| Motor | Prop | Performance | Gear Ratio | |
| 1:4 | ||||
| Original | Falcon F21X20R21X20 | Banery (mah> | P19 | 2800-3500 |
| F19 | 3500-4000 | |||
| Speed | Horizontal | 85-90 | ||
| Vertical | 75 | |||
| Current Draw (A) | Static | 75 | ||
| Max Horizontal | 63 | |||
| Vertical | 68 | |||
| align 700MX | Falcon F21X20R21X20 | Banery (mah> | P19 | 2800-3500 |
| F19 | 3500-4000 | |||
| Speed | Horizontal | 85-90 | ||
| Vertical | 75 | |||
| Current Draw (A) | Static | 75 | ||
| Max Horizontal | 63 | |||
| Vertical | 68 | |||
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Selecting the Right Gear Ratio All available gear ratios are listed in the following table: |
||||
| Props | Gearset | Downline Braking | Horizontal Speed | Vertical Pulling Power |
| 22x18 Rear, 22x18 Front | 1:4 | +++ | + | +++ |
| 22x20 Rear, 22x20 Front | ++ | ++ | ++ | |
| 22x22 Rear 22x22 Front | + | +++ | ++ | |
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