+1
All I can add is what I said in my previous post.
The only true wilderness is between the greens ears.

Jpx in france had an accident in 1990 years, they running propane gas at this time, i think that some countries was prohibited runs engines with gas.
Good luck
Jose

Agree with Jose... And based on your co2 emissions concern why not consider a good EDF system instead?

Oh no he can't go EDF. The materials used to make does batteries and materials puts a big impact on the environment. I would suggest a paper plane to hand throw. Oh wait a minute but then a tree would be cut down to make the plane. Well I got a better idea. Don't fly anything and watch me fly.