Model Boat Mayhem

Mess Deck: General Section => Model Boating => Topic started by: Daniel from Elsass on August 17, 2009, 04:34:44 pm

Title: Model Slipway, Sentinel with Hydro or waterjet?
Post by: Daniel from Elsass on August 17, 2009, 04:34:44 pm

Hi
I want to build a Sentinel Cutter of Model Slipway, but I schall to install a waterjet like the real ship.
Somebody has made this ? I think put a KMB 28mm
Thank for answer
Sorry for my Englisch
Best regards
Daniel

Title: Re: Model Slipway, Sentinel with Hydro or waterjet?
Post by: DickyD on August 17, 2009, 06:23:27 pm

Hi Daniel
You do realize that the jet was only used when the Sentinel was going slowly. For higher speeds they used the twin props.

Title: Re: Model Slipway, Sentinel with Hydro or waterjet?
Post by: Martin (Admin) on August 17, 2009, 06:58:10 pm

I wonder why that is?
Water jet, as everyone probably thinks are high speed units... jet ski, wet bike, Australian Jet Sprint race boats, European high speed ferries.......

Title: Re: Model Slipway, Sentinel with Hydro or waterjet?
Post by: FullLeatherJacket on August 17, 2009, 07:48:53 pm

Quote from: Martin - Admin on August 17, 2009, 06:58:10 pm

I wonder why that is?
Water jet, as everyone probably thinks are high speed units... jet ski, wet bike, Australian Jet Sprint race boats, European high speed ferries.......

Think about what the boat's job is:
Receive intel about target vessel - usually a slow-moving thing like a modiified tug or a yacht, 'cos you can't get much gear in a speedboat.
Fire up the Paxman Valentas and go like hell until target gets within radar range.
Stop, or overshoot and/or get spotted by the target.
Fire up small Gardner/Perkins loiter engine, which just happens to run a PP Jet (that's the way Vospers built it so don't argue). Valentas are really pump engines and don't like being throttled down too low for long periods. They also use a lot of fuel at Mr Taxpayer's expense.
Troll along just over the horizon from the target at low knots until ready to pounce within home waters.
Fire up Paxmans again and charge.
Play Action Man with the RIB and finally board the thing. Loads of madness, mayhem and rummaging.
Find the gear; secure it; dump the crew into the brig and have a cuppa.

BTW the scale outlet for the water-jet nozzle would be approx 8mm diameter. Good luck!

FLJ

Title: Re: Model Slipway, Sentinel with Hydro or waterjet?
Post by: Martin (Admin) on August 17, 2009, 07:58:19 pm

I hoped you were loitering Dave!  ok2

Title: Re: Model Slipway, Sentinel with Hydro or waterjet?
Post by: FullLeatherJacket on August 17, 2009, 08:45:58 pm

Quote from: Martin - Admin on August 17, 2009, 07:58:19 pm

I hoped you were loitering Dave!  ok2

Nope - I just designed the model, dude. Do you really think I'd have done a ten-day trip on a 'dry' boat?  8)
FLJ

Title: Re: Model Slipway, Sentinel with Hydro or waterjet?
Post by: Daniel from Elsass on August 24, 2009, 07:06:38 am

Thank for your answers, I comeback to the classic screws.
Best regards
Dan