No its not a tennis ball, its a flaming tennis ball of doom.
I did a "Flitetest" a few moments ago. Vtol isn't hard, and it is built light for its size.
I built it for a friend who wants an airsoft Machine gun in it, and when it isn't at an airsoft field, it is awesome for streamer combat.
Unfortunately, all 500 watts decided to break free in "flite" on the 3rd flight, so I have some repairs to make.
It has a 2.1:1 thrust to weight ratio, it weighs 500 grams in combat configuration, and has 1190 grams of thrust.
I am working on plans for it, Ill post them when I'm done.
PS It is vertical landing, I didn't pull out of a dive in time...it bounced, I picked it up, and threw it again.
Yeah It's tough.