images copyright A.F. (YESflyers.co.uk)
http://www.lightsportaircraftpilot.com/EAA_airventure_2008/1.html
http://www.pedalplanekits.com/
https://www.thepedairy.com
http://www.hcpconsulting.ca/tigermoth/tigermoth.htm
http://www.hcpconsulting.ca/p51/p51.htm
http://pedalplanebuilderspage.yolasite.com/
