Originally Posted by
pdt
is everyone on this forum taking the p..s or are they really as stupid as they are coming across ?
just do this sum for me, ill break it up to prove a point for once.
forget about wind weight blah blah blah for now.
5,000rpm with 2-1 gear ratio gives us 2500rpm at the prop right ?
we use a 12 inch pitch prop for ease of calculation, so its now 2500 feet per minute due to every turn of the prop is 12 inches. ..ok so far so good.
now we times that by 60 for the minutes of an hour and we get 150,000 feet ok...so far very easy ha ha
now we simply dived that number by 3 to give us yards, ( 3 feet = 1 yard) so we now have 50,000 yards per hour now....still with me, great stuff.
now simply dive the 50,000 yards by 1760 to get miles per hour and we have arrived at ????????? mph..that is maximum,
if a guy tells you his boat does this with these figures then he is a lying retard.
its impossible, this is absolute max speed, not what it will do, this is only possible with a weightless boat with no air drag and no water drag, it would need to be 100% perfection
for the drag both underwater and above, the weight would need to be total zero as well.
it has to be a American v English joke,nobody can be that thick not to understand maximum speed etc.
by the way the speed in the math above will be 28.409 mph
phill
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