400 size motors4

[Myron Beaumont]

Excuse my ignorance in these matters & I'm almost embarressed to ask but -What is a 400 size motor that retailers keep referring to?

[Stephen Grigg]

Its  a .brushed motor that seems standard for most e/kits The Easistar has 1 The twinstar has 2.A couple of other kits had the same motor.

[Myron Beaumont]

Thanks Stephen for your reply _ trouble is- I'm non the wiser  I have a couple of brushless out runner motors but dont know what applications are available to fit them in ? They are AFA -OM480   2300 KV & I have a 4s Lipo pack of 22000mAh  . What I want to do is use this gear to power a glider/ slope soarer type thing & will design the airframe around the weight etc criteria The max output  of each is just over 400 watts (using my wattmeter on an EDF unit) It will be a big glider -Just what I want to build Maybe 8 ft span  .What do you think ?. I'm on a steep learning curve from ic stuff but can see the advantage of 'lekky power on a pod on a glider. no. 1   the nose ballast will be the battery !

[Tim Mackey]

2300 Kv is a tad fast for props, except very small ones, so not likely to be right on a large glider.

400 referred to the diameter of the case ( approximately 40mm ) and speed 600 = 60 mm etc etc

For large glider type thingy you need a slow revving ( low Kv 800 -1200 or so ) and big prop for lots of thrust rather than top end speed.