[MHml] horsepower & sleds

[Peter Southwood]

At 20 knots? rough water?
I dont think so.
Cheers,
Peter

----- Original Message ----- 
From: "Ross Hobson" <R.S.Hobson at ncl.ac.uk>
To: "Informed discussion of multihull issues" <multihulls at steamradio.com>
Sent: Thursday, February 01, 2007 9:48 PM
Subject: Re: [MHml] horsepower & sleds


> Bill
> sounds as if you have just described a big RIB (7+m long) with a 
> diesel/petrol inboard and tow afterburner on a bridle
>
> Ross
>
> ________________________________
>
> From: multihulls-bounces at steamradio.com on behalf of Bill Gibbs
> Sent: Thu 01/02/2007 19:28
> To: 'Informed discussion of multihull issues'
> 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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