I have a web page dedicated to the Peterson Javelin. I produced it
from research into makeing a 4m span scale model which flies
beautifully. The information can be found at

http://web.ukonline.co.uk/sssrcsoaring/

and look inder the "Spotlight " link

I was helped in the process by documentation supplied by Dale Thompson
of San Francisco and from an owner, Ed Luckie who sent me photos. I
believe his J4 is up for sale. To save any Spam for Ed I will email
his contact address direct to you

Vince
(UK)