I am converting a nitro powered Air boat to electric. Can someone tell me what the hole circle or measurement across the mounting holes on the Park E-flite 450 Brushless motor is. I am waiting on the motor and would like to build the mount.

Thanks,
John (Retired Machinist)

Park 450 Brushless Outrunner Motor, 890Kv
Specs
Type: Brushless outrunner
Size: Replacement for 370 or 400
Bearings or Bushings: One 4 x 8 x 3mm Bearing, and One 4 x 9 x 4mm Bearing
Recommended Prop Range: 9x6 to 11x3.8 Slow Flyer or 10x5 to 12x6 Electric
Voltage: 7.2ā€“12
RPM/Volt (Kv): 890
Resistance (Ri): .20 ohms
Idle Current (Io): .70A @ 8V
Shaft Diameter: .16 in (4mm)
Overall Length: 1.30 in (33mm)
Weight: 72 g (2.5 oz)
Overall Diameter: 1.10 in (28mm)
Diameter: 1.1 in (28mm)
Length: 1.3 in (33mm)
Continuous Current: 14A
Maximum Burst Current: 18A for 15 seconds
Cells: 2ā€“3 Li-Po or 6ā€“10 Ni-Cd/Ni-MH
Speed Control: 20A brushless ESC

Needed to Complete
20A brushless ESC
9x6ā€“11x3.8 prop
2Sā€“3S 1200ā€“2100mAh Li-Po Battery

It's best to wait for the motor. It comes with an X-mount, and is easy to install.