Hi, I hope this will be helpful. I just got off the phone with LS. Red built many of his planes in Larry's basement, so, at least, we are pretty close to an original source. His recollection is that the ISW weighed 22-23 oz with motor (Fox .35) and tank. Another factoid is that, when Red and Larry were at the Plymouth International together, Red was having tank issues and swapped the tin tank for a Jim Walker pressure system. The first flight with it crapped out early. On the second flight which won the meet, the plane quit just as Red completed the pattern! There may be some original printed material out there but this should be helpful to you. Tom