XPower F2925/8 Windy 1380 RPM/V 102g Cased Outrunner

The F2925/8 Windy is an excellent high performance cased outrunner for 3m – 4m electric gliders, especially F5J competition ships ballasted up to 2300g weight. The 28mm diameter outer can does not rotate and the wires extend from the rear so it is perfect for installing in narrow glider noses, and the 5mm motor shaft stands up to dorked landings.

Eliminating the gearbox simplifies the powertrain and reduces the risk of failure. It also results in requiring a smaller (less efficient) propeller. In the past that was a disadvantage as powertrain efficiency was essential for good performance. However with the current state of technology excellent performance can be achieved even with small props, and they do offer several advantages, namely:

• Less stuff hanging out in the wind and less glide drag, so overall better glide performance, especially at speed.
• Usually a higher pitch speed is obtained, allowing very fast transitions to a low level thermal a long way away (if you are one of those god-pilots who know there the lift is).
• Smaller propellers reduce the effects of torque, making the initial climb out easier.

XPower F2925/8 Windy Specifications
KV	1380 RPM/V
Max current	60A for 30s
Power	700W
Internal resistance	27 mOhm
Dimensions	Ø28.1×48.7 mm
Mounting	2 holes on 16 mm & 2 on 19 mm diameter
Shaft diameter	5.0 mm
Weight	102 g
Number of poles	12
Recommended number of cells	3 – 4 LiPo
Recommended props	11×6-11×8″ on 3S, 10×5 on 4S

Recent Measurements

3S LiPo, hub with 38mm pin spacing:
61A with 11/6″ Aeronaut fold.prop
49A with 10/6″ Aeronaut fold.prop
57A 11/6 Graupner fold.prop

Older meansurents

Prop: XPower Carbon Folding Prop 11×8″+ 32mm spinner
Controller: YGE 65LVT
Battery pack: Hot Lips VHD 850 4S1P
RPM: 12000
Current drain: 56A
Static thrust: 2.5kg

Prop: GM DD Carbon Folding Prop 11×6″+ GM 32mm carbon spinner
Controller: YGE 65LVT
Battery pack: Hot Lips VHD 850 4S1P
RPM: 11700
Current drain: 56A
Static thrust: 2.3kg

Prop: XPower Carbon Folding Prop 12×8″+ GM 32mm carbon spinner
Controller: YGE 65LVT
Battery pack: Hot Lips VHD 850 3S1P
RPM: 9100
Current drain: 48A
Static thrust: 1.95kg
Recommended controller: YGE 65LVT