[MHml] horsepower & sleds

[brian eiland]

Brian noted:
Maybe there is something to learn from the 'Thai' long-tail boats...engines of
all sizes mounted on pivot point with long shaft to surface effect prop
(little drag) , easily removable, separately transportable?????


------ Original Message ------
Received: Thu, 01 Feb 2007 02:29:26 PM EST
From: "Bill Gibbs" <BillG at GibbsCAM.com>
To: "'Informed discussion of multihull issues'" <multihulls at steamradio.com>
Subject: Re: [MHml] horsepower & sleds



 We have a mounted 20hp Honda in a central pod. It's a bit of a pain to
remove. It is adequate, though it ventilates in choppy 
seas. We can do 7.5 knots in flat water. But we lose a lot in a headwind
and/or seas. And our typical return transit is up the 
coast into headwinds and seas. We do sail home on occasion and motor-sail to
good effect, with good speeds but reduced VMG for sail 
angles. 

I'm imagining a trailerable mule boat that will get us over 20 knots. 20 knots
VMG on a return transit would be awesome. 6 knots 
is our rough overall average VMG combined motoring/sailing/motor-sailing,
though this can vary with conditions. 

Bill 

-----Original Message----- 
From: multihulls-bounces at steamradio.com
[mailto:multihulls-bounces at steamradio.com] On Behalf Of Ross Hobson 
Sent: Thursday, February 01, 2007 10:51 AM 
To: Informed discussion of multihull issues 
Subject: Re: [MHml] horsepower & sleds 

Towing is easier than pushing - but you need weight in the RIB or it will slew
all over the place. An easy way is just to flood the 
floor , this is necessary when slow manovering and starting off, once up to
speed drop the flooded water. Avon Seariders are 
excellent in this situation as their hull is designed to flood and empty 

for the engine on afterburner: 
what about an internal 'trunk' ie a box that lifts out inside one hull that
you can drop the outboard into (venting it outside 
obviosuly). the prop will always be in the water. 

when you get to destination - lift out engine - drop in 'box' to seal hull and
reestablish hull shape- minimal weight if built in 
foam/carbon 

we used to have this arrangment on Mollymawk and it worked really well - until
the rules changed which meant we had to change the 
set-up. 
How much HP do you need?? 
10hp pushed Mollymawk at 6-7knots when in it's well and 5-6 knots when mounted
aft on a conventional o/boatrd bracket as the engine 
was lifted in and out of the water due to pitching 
5Hp pushes Charleston at 8knots, -but she is more an overgrown, steroid fed,
beachcat 

20 or 25hp in an internal set up should allow Afterburner to move easily at
8-10 knots ?? 

Ross 

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Brian Eiland

beiland at usa.net
www.RunningTideYachts.com
distinctive expedition yachts