The Scott Sled was invented in 1964 by Frank Scott of Ohio. When a collegue asked me whether I'd like a kite and spool he'd found in an attic, this is what it turned out to be, and probably an early examply, too, judging by the similarity to the original Scott design. It has no manufacturer's name on it, so I assume I will be offending nobody's copyright to reproduce the dimensions here, for anyone who would like to build one.
The bridle consists of 1200mm of line attatched at its two ends to the wing tips, and with a loop tied in the middle for attachment of the flying line.
The two spars are 6mm dowel.