Re: How can a 46' boat get same mpg as a 25' RV ?
briggs_at_encompasserve.org
Date: 02/03/05
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Date: 3 Feb 2005 11:49:30 -0600
In article <hFrMd.2462$pf5.258095@phobos.telenet-ops.be>, "CWatters" <colin.watters@pandoraBOX.be> writes:
>
> <nospam@nospam.com> wrote in message
> news:but201lskoli0l0pcob9g74i01qq033p87@4ax.com...
>>
>> I was looking to buy a 46' sailboat and was very surprised
>> to find that it gets about 7 mpg when using its diesel engine
>> for power. This is almost the same as what I get from my 25'
>> motor home (which also has a diesel engine) on the average
>> (although the motor home gets about 8 mpg on the freeway).
>
> Drag is proportional to speed^3.
Drag force is proportional to speed^2 (roughly)
Drag power is proportional to speed^3 (roughly)
If you're looking at miles per gallon, the former is more relevant
than the latter since the figure of merit is energy per unit
distance rather than energy per unit time.
John Briggs
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