View Full Version : Osprey-Guzzi

gpzoduibh - n/a
16-Feb-09, 05:06 PM
Hello to all I have been "lurking" without posting for a while I have the remains of an Osprey H-craft



And am looking at fitting a Guzzi V50 motor in it as in :


This is a rough up:


Has anyone fitted a Guzzi engine in a craft before and do any of those in the know have any recommendations ?


Bill Black

Ian Brooks - n/a
16-Feb-09, 06:31 PM
I suspect a V50 motor would be a good choice... but JUNK the Italian electrics!


GavinParson - n/a
16-Feb-09, 08:26 PM
That is a Kestrel hull you have. That engine will be wasted with such a small duct. Also the Kestrel has very little freeboard and isn't really suitable as a cruiser. If you stopped on water with such a heavy engine you will either capsize or sink.

Believe me I capsized a Kestrel in the estuary 25 years ago and that was with a relatively light 2 stroke engine!

Irish Falcon - n/a
16-Feb-09, 08:36 PM
Hi Gavin, Kestrel and Falcon? where did they fit in the Osprey timeline? Philip

kevthehover - n/a
16-Feb-09, 09:56 PM

<font color="darkblue">Not the best of pics but this is a Falcon with the larger duct on it. It had a Robin Reliant engine in it and i belive i may know where one is, but i had worked on it in the last 2 years. PM me if you want any more details i may still have some of the mouldings to enlarge the Duct if you are intested.

Kind regards

Kev [/COLOR]

GavinParson - n/a
17-Feb-09, 06:41 AM
Early 80s. I'm sure Kip will fill in the details. I bought my first Kestrel ex Paul McCollum in 1984 which I used on the Medway, Thames and Loire with a hybrid Yamaha RD250E/LC. Then in 1986 bought Martin Dougalls Kestrel which had a "huge" 800mm duct and raced it in F3 with the same engine which had been tuned by bike racer Paul Siddons. Mick Anderson had more success with that engine after I sold it to him.

When I first met the South Eastern Hoverclub in 1984 almost everyone had a Kestrel or a Falcon. Perhaps because Kip was club chairman http://hovercraft.org.uk/images/icons/smiley_icons/icon_biggrin.gif .

I only ever remember one Falcon with a Reliant engine and that was Nick Flint's who used to write great mag articles about his hovering holidays. Could Kevs picture be of that craft?

As I say, craft design has moved on and the fundamental flaw with these craft was the foam block bonded on the bottom which rendered them prone to capsize. On later craft Kip moved the buoyancy up to the planing surfaces resulting in a safer and more stable floating platform. Also freeboard was increased.

gpzoduibh - n/a
18-Feb-09, 09:15 AM
So are you saying dont waste the time effort and money ? I live in the countryside adjacent to a canal and have 25 miles available without a lock which is where I was planning on using it , can the two halves be seperated with this hull or does the (urethane?) foam stick the two together , I have access to fibreglass expertise, ( father in law is a boat builder !) so I could perhaps change the duct , would I be better off sourcing a fixer upper hull in the UK ?

Thanks for the replies and opinions

Bill Black

david ryan - n/a
18-Feb-09, 09:26 AM
Hi Bill. Off topic a bit. Will you be comming to the AGM this year?

gpzoduibh - n/a
18-Feb-09, 09:34 AM
Barring any domestic disaster , I hope to join you for tea and sangers again ?

Regards Bill

GavinParson - n/a
18-Feb-09, 11:12 AM
You could separate the top hull from the planing surfaces, install a foam core for rigidity then bond buoyancy foam behind the planing surfaces but personally I wouldn't bother.

Much better to invest in a more modern hull.

gpzoduibh - n/a
18-Feb-09, 01:53 PM
Thanks for the feedback Gavin

just on your last comment , I am a little lost as far as terminology , the hull I have consists of the lower f-glass layer (the planing surface?) which changes angle to meet the top "deck" around its perimeter are holes which align with each skirt segment , between the lower layer and the deck layer is a foam "slab" which is the buoyancy ? is this different from what you are describing ? In front of the handlebars their is a compartment the lower section has a recess for a battery in here I can see the slab which oozes out from the deck/lower skin junction , Maybe I should take a picture ?



GavinParson - n/a
18-Feb-09, 03:33 PM
What you're describing is correct. This craft doesn't have a one piece planing surface moulding. The top hull moulding is bonded to the foam block then a thin fibreglass sheet is attached between the foam block and the lip where the skirt attaches. Then the entire underside is covered with another layer of fibreglass. Then the aluminium skirt strip is rivetted on further joining to top and bottom.

In order words it's not simple to separate the two parts. If you reduced or removed the foam block then the planing surface and skirt geometry will change.

Hope this makes sense.