[MHml] recent comments

[Tim Bell]

Fair cop Dave, 
I bow to your superior knowledge.   I understand they fill the block's water channels with grout (concrete) and rebuild the engines after every run, but that subject is for another forum somewhere.

I was just trying to make a point that Bill just needs to suck it and see with a biggish O/B on AB's new tug/pusher boat, rather than spend endless hours analysing how much horsepower gets lost in slip on a inappropriately pitched/diameter propeller.



Best Regards 

Tim 





-----Original Message-----
From: multihulls-bounces at steamradio.com [mailto:multihulls-bounces at steamradio.com] On Behalf Of Dave Culp
Sent: Tuesday, 20 February 2007 12:04 p.m.
To: Informed discussion of multihull issues
Subject: Re: [MHml] recent comments

Yeah, we are a society of "more horsepower."  ;-)

FWIW, however, a dragster uses something on the order of 2-5 gallons/mile (not miles per gallon, but gallons per mile) and even considering the largest budget AB likely commands, fuel economy is still an issue, if only defined by her fuel carrying capacities (volitile gasoline must be carried on deck for an application such as this. I might also add that power, popular as it is, costs money and even very wealthy people (of which Bill likely excludes himself) don't like to just pi&$ it down drains, eh?  ;-)

Last, again fwiw, top American dragsters do not spin their wheels--spinning is an automatic loser--too slow. They keep 100% contact with the road throughout their runs. Also, top fuelies do on the order of 500-530 kph (340 mph), not ~250, and so it in less than 5 seconds, over 1/4 mile. They can do 0-530, and back to zero, all inside of 15 seconds--pulliing G forces in excess of 5 on both the runup and rundown. They do this with 5 Mw (6700 hp) V-8 piston engines. (all per wikipedia).

We got power, my friend. It's just a matter of how much Bill actually wants to pay for!

Dave

On 2/19/07, Tim Bell <tim.bell at brightwater.co.nz> wrote:
>  Aren't we/you getting hung up on ideal, and efficient, and perfect..... All Bill needs is a big enough outboard to push AB along at a better speed than he currently gets with the 20HP Honda. It doesn't matter a tinkers cuss whether the prop is the right one or not. The motor will still throw a s..t load of water behind it which will push AB along. As you Americans are so keen to say nothing beats horsepower, the more the better.... :) An AA fueler dragster has more prop slip (wheelspin) than you ever imagined but still manges to reach 250m/h in 4 or 5 seconds or so......
>
>
> Regards
>
> Tim
>
>
>
>
>
> -----Original Message-----
> From: multihulls-bounces at steamradio.com 
> [mailto:multihulls-bounces at steamradio.com] On Behalf Of Dave Culp
> Sent: Tuesday, 20 February 2007 9:09 a.m.
> To: Informed discussion of multihull issues
> Subject: Re: [MHml] recent comments
>
> And yet there is a fairly appropriate, mature market segment--using largish outboards to push big houseboats around. A good engine manufacturer rep (not your local salesman) might be able to specify a motor/prop combination optimized for the conditions you need.
>
> Dave
>
> On 2/19/07, Martin Schöön <martin.schoon at gmail.com> wrote:
> > On 2/19/07, Bill Gibbs <billg at gibbscam.com> wrote:
> > > Understood.
> > >
> > > Though there seems to be a lack of precision in the methods for 
> > > pre-determining this.
> > >
> > Good enough to tell a 40 knot and a 15 knot design apart for sure.
> >
> > --
> > Martin Schöön              "Problems worthy of attack
> >                                          prove their worth by hitting back"
> >                                          Piet Hein 
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