The X-Fires (Art pronounced it "Crossfire") and Double Helices were not identical. They differed in the physical layouts but both were exceedingly cool. The corkscrewing smoke trail was a great sight during the day and we occasionally launched them at night also.

The important thing is the launch platform. A 1/4 inch bolt through a pair of crossed 2x4s works well. Trying to launch from a regular launch rod is an invitation to disaster.

__________________
John A. Lee O.S.L.
Alamo Rocketeers NAR Section 661
NAR 87285, L1 8 March 2008
TRA 03040, L1 8 March 2008
Photos of the "Fleet": http://www.flickr.com/photos/23694991@N03/

I used to tell Mom, "...I want to fly rockets when I grow up!"

She said, "Make up your mind, you can't do both!"