There has been a newsletter published for quite a number of years by Tim Goldstein catering to the indoor free flight crowd. Some of our Mini Micro RC flyers are very similar in design and construction. INAV has made available the a number of back issues of INAV and are available on their website, you might like the newsletter so much you might even subscribe. I am not associated with the group in any way but have much enjoyed reading through their web site and newsletter when I get an opportunity.

http://www.indoorduration.com/IndoorDurationFrame.htm

cheers, the other other Graham in Embrun near Ottawa Canada.