http://www.setp.org is the obvious one, lots of useful papers. Similarly
http://www.sfte.org which is less readable but has a lot more technical stuff.
Microlight spin testing guidance at
http://www.bmaa.org/025_1.pdf
A selection of generic test schedules (again for microlights but modifiable for most fixed wing types) at
http://www.bmaa.org/forms.htm (look at forms 010, 011, 027 - plus 034 is an ETPS style blank test plan pro-forma)
Guidance on performance testing light propeller aircraft at
http://www.allstar.fiu.edu/aero/Airper-BA.htm
Lots of conversion factors and formulae at
http://www.best.com/~williams/avform.html
A few oddments at the RAeS at: -
http://www.raes.org.uk/light-av/papers.htm and
http://www.raes.org.uk/raes /First/specialistgroups/specialistgroup.asp?sessid=&group=20
(The latter is rather profoundly uninformative)
That's about all I've got I'm afraid.
G
[ 11 October 2001: Message edited by: Genghis the Engineer ]