Here are some ideas.
The T-IFO is a trainer type indoor/outdoor slow flyer that could be flown in
that space.
http://www.wildrc.com/htmlpages/tifo.html
http://www.wildrc.com/htmlpages/ordertifo.html
The I.F.O. Aerobatic R/C Slowflyer - - Big brother to the T-IFO
With the right flight pack, it can hover on its prop and is almost
indestructable. You could sit on your back porch and fly this around your
kids.
http://www.hobby-lobby.com/ifo.htm
IFO Demo at the 2000 Tournament of Champions
http://www.wildrc.com/htmlpages/movies/toc2000.mpg
Flying Combat in a gym
http://www.wildrc.com/htmlpages/movies/mk3combat.mpg
A bunch of IFO Flight videos including one inside a 15X25' office
http://www.wildrc.com/htmlpages/flightvideos.html
I have read that you can even pack this up in a suitcase and take it with you
on a trip. How cool is that?
INDOOR TYPE PLANES THAT MIGHT WORK
here are a few thoughts on Indoor planes that could be flown outside. It will
have to be dead calm to fly in that space. The turbulance coming off those
trees with any wind will be wicked..
1) GWS Pico Stick
http://www2.towerhobbies.com/cgi-bi...p?&I=LXHCH6&P=7
2) Butterfly - RTF
http://www.plantraco.com/hobbies/product_butterfly.html
3) Wattage Micro Flyer
http://www.redrockethobbies.com/pro...100.htm&click=2
4) Kite wing
http://www.redrockethobbies.com/pro.../watt128296.htm
5) Rookie
http://www.redrockethobbies.com/Wat.../watt157105.htm
6) Blimps
http://www.redrockethobbies.com/Rc_Blimps_s/87.htm
7)