One tiny correction to Wayne's writeup: Dick Schreder's amphibious
motorglider was to be the HP-22, not the HP-21. Here are scans of the
original spec sheets for this aircraft:

http://www.hpaircraft.com/info/hp-22/hp-22_1.jpg
http://www.hpaircraft.com/info/hp-22/hp-22_2.jpg
http://www.hpaircraft.com/info/hp-22/hp-22_3.jpg

Thanks, and best regards to all

Bob K.
http://www.hpaircraft.com/hp-24