Not for the first time I've watched an auction just finish of an Avon 3.4S Supersport thinking I fancy one of those craft... it's a varnish and Hypalon thing!
Years ago I was talking about one and Matt H very kindly uploaded some scans of a brochure here...
Avon Supersport on ebay
That gives the weight of the 3.4S as 88lb which seems hard to believe. I have a Rover 3.1 at the moment which is a far lighter grade boat only rated to 10HP but that weighs 91lbs.
Then... if you're sticking with this... there is a thread with a slightly different scan of an Avon Supersport brochure... Avon S400 project
where the page with the dimensions for the 4.0 has just caught the bottom of the section for the 3.4 where it shows the weight as a diagram of a bag weighing 88lb for the boat plus a representation of a bagged floor at 57lbs. So I suspect the real weight is 88+57 = 145lbs and the first brochure linked has forgotten to include the floorboards weight.
Any thoughts much appreciated.