[MHml] horsepower & sleds

[Robert]

That would be something to see going down the highway.  A Prindle 16 with a
150 HP outboard mounted in the center of the tramp area.  Cool idea though.
My gut feeling is the hardest part would be the link to AB. If you have it
under the tramp behind the main beam it will slam in any sort of sea.    I
think you would need to have the push links come off the "Yule Boat" ( that
is what Bolger refers to it as) at the same level as the rear crossbeam so
the engine is not pushing the Yule down.  Attach to the rear beam with two
braced push links all you need is 4 attachment points on the rear beam.
Very possible.  


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		   OB here.


Robert 
-----Original Message-----
From: multihulls-bounces at steamradio.com
[mailto:multihulls-bounces at steamradio.com] On Behalf Of Bill Gibbs
Sent: Thursday, February 01, 2007 7:27 AM
To: 'Informed discussion of multihull issues'
Subject: Re: [MHml] horsepower & sleds

My "removable sled" idea is intended to be a boat in it's own right,
complete with trailer.  Maybe a beach cat.  My thought was to
park it right underneath Afterburner and let it attach/pivot/push on the
main beam.  This gives me a lot of options for
rigging/staying.  It would be unmanned while pushing, the outboard head
would be just behind Afterburner's aft beam, the only height
clearance issue.  I'm a concerned about the weight capacity of such a sled,
500 pound outboard and 700 pounds of fuel.  Pivoting, it
would keep the prop in the water better than Afterburner does.  In seas I'd
need a way to keep it from slamming up into
Afterburner's undersides.   Shock absorbers?  What do pivoting sleds do?

Ground crew would trailer it to and from appropriate places. Shorter
transits would extend our racing range and make getting transit
crew easier. I wouldn't need a slip for it as I could dry store it or in a
slip under Afterburner.

Regarding your RIB suggestion, Is pushing easier than towing?  Who would
want to sit in the RIB for days at a time?

Bill
Afterburner

-----Original Message-----
From: multihulls-bounces at steamradio.com
[mailto:multihulls-bounces at steamradio.com] On Behalf Of Larry Forgy
Sent: Wednesday, January 31, 2007 10:38 PM
To: Informed discussion of multihull issues
Subject: Re: [MHml] horsepower

Bill Gibbs wrote:
> Maybe it's easier to get proportionally bigger props on two smaller
engines?
>
> It seems that one bigger engine should weigh less.
>
> Thanks for the Gold Coast ref.
>
> I'm 2 feet shorter LOA, and 1/2 their light weight of 22k pounds, 1/3rd
> their heavy weight.  We weigh 10,000 loaded.
> I'd be looking at an outboard, not a diesel.  100-200 hp is more
achievable.
> I'm toying with a removable sled idea.
>
> Bill
>   
Bill,

Wouldn't a big RIB with a big motor that you could tie up to push 
Afterburner be easier than the removable sled?  A sled for a 100-200 hp 
motor is going to have to be pretty substantial and a real pain to 
attach/detach.  And, if the sled is for faster returns after racing, how 
would you get it delivered to the boat?

The RIB would just need a driver, and also be more versatile.  It might 
even be cheaper than a custom engineered and built sled.

Larry Forgy

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