The main and easy method to know is the asw27 with the 2 jet engines. No matter what type, at 131lbs you takeoff. And the asw27 is quite heavy by itself. Also, i<m not saying the glider will be efficient. But mission is takeoff to max 2k then glide back home. If flight line is empty and good condition.. unscrew the fan and take off by the tow. But it should cut the ratio not much more than a tricyle wheel system.
/Martin, On the wingspan.. yes, a 17m version possible ?
I beleive that with 2 jet engines with 131 lbs / 600 N thrust you probably can takeoff. ASW 27 MTOM is 500 kg, but EW starts from 245 kg. It is not really "ultralight" glider, but you will probably not use water ballast in case of self launch tests
For 17 m version we have finished wing extesion models and I am planning how to produce the set of moulds for first "flight testing" set.
Idea is to have possibility to change the wing extensions according to "flight mission"
- 10,3 m span - no extensions - parking in hangar
- 10,6 m span - short winglets - higher wing load, high maneouvrability
- 15,0 m span - long economical cruising, aerotowing
- 17,0 m span - soaring