Luth: Thanks for making the clarification between hovering and flying models, and good job with the hot air balloon.
While I was messing around with an inertial model of mine, I came up with a strange half-roller half-flyer thing. Its mechanism resembles half of Luth's deadweight, and there are no counter-rotating bits. If there were, I'm sure the model would take off. However, the rotational thrust spins the entire thing around, and changes the direction of the linear thrust, making it return to the ground. So you have a half-roller half-flier thing.
http://sodaplay.com/constructor/beta/applet.htm?&getmodel=edlinfan+messed_up_flier
For whatever reason, you have to manually switch the direction with "forward" and "reverse" to get it to autoreverse. (It does have autoreversing capability, though.)
I might make a better version, but it would be a blatant rip-off of Luth's design, so I probably will not.
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