Hi Craig,
We developed the XD91 out of the old Skyburner design of many years ago.
It has morphed into several different styles, butstill flies great - even a turbine version.

The XD production was taken over by a couple of guys. It is no longer advertised, but I know there is still a few partial kits available.

If you send me a PM, I can supply name and phone number.

Regards
Dave Burns
IJMC Rep. Australia/New Zealand