Brian Felice has an awesome site with a great page on Pull Pull. Also check out his "Wedge" airplane which uses all Pull Pull. I've talked to him several times by email and he's super helpful. Also check out the Ackerman page which describes the Mechanical ways of the Pull Pull.

Jeff

[link=http://members.cox.net/bdfelice/Pull-pull/pull-pull.htm]Pull Pull[/link]