I have been working on different power units for my 3m and larger gliders.
Here is my latest, even though I prefer direct drive for reliability.
Maxon 4.4:1 gearbox mated to Heli Turnigy L2822
3700kv, 420watt
here is the link:
https://www.hobbyking.com/hobbyking/s...tor_420w_.html
Looks promising for a lighter glider, did not get very warm at 44A 30sec. It may take more, it is rated at45A max.
Here is my test data so far:
weight 133g, 4mm shaft ( Actual motor only 82g, 3mm shaft)
3S 3300 test lipo
14x8 E-Flight folder: 44A, 440watt, 7800rpm
13x8 Hobby king Carbon: 44A, 440watt, 7700rpm
13x7 Graupner folder: 39A, 390Watt, 8000rpm
next will try 15x6 Aeronaut and may be 15x8 but I think that may be too much.