hi nice people!
thanks for the adivices,
now i thing that i'll use this motor:

KB45-12L 1400kv Brushless Inrunner
Kv: 1400RPM/V
Weight: 449g
Shaft: 6mm
Size: 63x45mm
Voltage: 36v
Highest rated power: 2246W
This size motor will fit our larger 5inch and 4.75inch EDFperfectly. (same mounting holes & shaft size)

with this lipo battery:

<font size="3">Turnigy 5000mAh 6S 20C Lipo Pack</font>
Minimum Capacity: 5000mAh
Configuration: 6S1P / 22.2v / 6Cell
Constant Discharge: 20C
Peak Discharge (10sec): 30C
Pack Weight: 793g
Pack Size:148 x49 x 49mm
Charge Plug: JST-XH<div>Discharge plug: 4mm Bullet-connector

does it mach?
what you guys thing?

sorry for the ignorance, but here in brazil this kind of hobby is extremely dificult access, since i was a kid i wanna a rc boat, now i`m constructing one.
its a cat like the picture up this page, soon ill post a foto.</div>