I think it has something to do with metal ship building. A company in England used the name as a trademark.
I will dig into it more.
I found this if it helps.
THESES (M.Sc.) -- Univ. of strathclyde, division of ship and marine technology, U.k., 1988
h t t p : / / d a t a b a s e . i r a n d o c . a c . i r
This study is concerned with developing a procedure for generating a developable surface with computer programs.A brief reveiw of the manual graphical approach is made and then a hydroconic hard chine hull form design procedure is carried out in order to take adveantages of the speed and precision of the computer. A design algroithm for such a hull is developed and with regard to the production aspect the equivalent flat plate shape outline is produced by author computer program. Finally a program to calculate the corresponding longitudinal centre of buoyancy for the generated hull form is produced.
Hydroconic hulls, used for tug and small craft, are basically a series of hard chines rather than a smooth curve. How someone came up with the idea, I don't know, but it was back in the 50's. Check the gallery for some pix and drawings if you haven't seen them already, and in my gallery, look at a picture of the tug Meeching (1960) on the gridiron at Newhaven, that shows the hull shape clearly. I'll see if I can get permission from our local museum to post a picture of Meeching's launch that also shows it.
I actually saw a small sailing yacht on a trailer a week or two ago, with a steel hydroconic hull. Never seen one before and couldn't get to my camera in time.
PS. I don't know if it's a characteristic of all hydroconic tugs, but Meeching was 'lively' at sea. My Dad was her skipper when she rolled to 50 degrees in a force 9. She bounced back, though!
The Hydroconic principle as applied to hulls was patented by consultant naval architects Burness Corlett, and was licensed out to a number of builders at home and abroad. Some Aberdeen trawlers were built by Mitchison shipyard to this design.
We had several trawlers in Granton built on the 'hydroconic' principle, they were
commonly refered to as ''Hydrocomic'' boats, though far from humerous when working in gale conditions.....................WLH
My Dad would have loved the term Hydrocomic to describe Meeching's rolling. I looked at the museum today and the only photo of her launch is a press cutting that won't reproduce. In the musuem somewhere are the original b/w pix but they're not in the index file! I'll have another search.
That pic does show that she's a double chine design, as all the Harris tugs seem to be.