[MHml] horsepower & sleds

[Michael Conley]

Hi Bill
     How about using a standard rib getting it under the boat lifting the bow up and leaving the last quarter sticking out lifting it a little to take the pressure off. three point suspension. Then get an evinrude e-tec durajet no power lost off the blade tips or side thrust,75 amp charging@ 235 lbs for 60 hp
  Mike
Dan Frenette <Dan.Frenette at Sun.COM> wrote:
  You would be better off building something simple out of plywood or 
aluminum than using a beach cat? The flotation would be better with a 
flat bottom hull set vs round bottom. You want lots of flotation in the 
transom.

Was/is there a reason you want low resistance hulls? Scow shaped hull(s) 
would be able to plan off when not pushing afterburner. Very simple to 
build aka expendable. Think put it in the way of something you may need 
a barrier for like a sea wall or junk in the water (Ensanada).

Given the amount of weight and size of the motor(s) the beach cat even 
if it had the right flotation wouldn't come with the strength in the 
attachment points to take the loads. When you bang into a wave sailing 
the boat weighs in a X. You are going to be maybe 50X?

Dan Frenette

Bill Gibbs wrote:
> 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?

Put a natch in the boat and connect it to the after beam. It can't bang 
if it's connected.

> 
> 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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