Fellow Golf buddy thought he was making a killing when he bought a 50 foot motor boat with twin cat engines in Adelaide off a friend. First shock was that ,according to him , fuel cost Adelaide/ Brisbane was close to $20,000!
I told him wind was free
If he's not in a hurry all he need do is to run it on one engine and alternate between one and the other to share the total hours. The speed difference between one and two engines is possibly not going to be as large as one might imagine.
Boat's already in Brisbane . He thinks he might have been to smart for his own good as it needs big dollars to bring it up to scratch
Select to expand quoteBananabender said..
Boat's already in Brisbane . He thinks he might have been to smart for his own good as it needs big dollars to bring it up to scratch
Sounds like he needs to raid every fish and chip shop around and make his own bio diesel.
People who own 50ft motor boat soon learn that the word boat is actually spelt with 2 "T"s. (Bring Out Another Ten Thousand)
Select to expand quoteCrusoe said..
People who own 50ft motor boat soon learn that the word boat is actually spelt with 2 "T"s. (Bring Out Another Ten Thousand)
Oh geez, now you've done it ..... H2O will now be unstoppable 
Long time ago I was a member of the Sydney Flying Squadron in Careening Cove and opposite us was an original WW2 MTB and in all the time I was a member no one can recall ever seeing that boat leave the dock.
Possibly something to do with having three Rolls Royce Merlin V12 in them, your mate with the twin Cat motors may have got off lightly.
Select to expand quoteLooseChange said..Crusoe said..
People who own 50ft motor boat soon learn that the word boat is actually spelt with 2 "T"s. (Bring Out Another Ten Thousand)
Oh geez, now you've done it ..... H2O will now be unstoppable 
What was that? Two T.T's
Select to expand quoteHG02 said.. What was that? Two T.T's
Calm down R2D2, you will burst a blood vessel if you excite yourself too much ...... 
.... scuse me while I snigger to myself
Select to expand quoteLooseChange said..
If he's not in a hurry all he need do is to run it on one engine and alternate between one and the other to share the total hours. The speed difference between one and two engines is possibly not going to be as large as one might imagine.
Yes, running one engine at a time is an excellent recommendation. He should also make sure he runs at the recommended cruising RPMs, not any faster, else he'll kill fuel efficiency.
By way of comparison, here are some stats for my Lightwave 38 sailing cat which has twin Volvo Penta D1-30 engines (27 hp):
1 engine (cruising @ 2400 RPM): 6.5 knots @ 3 litres/hour
2 engines (cruising @ 2400 RPM): 7.5 knots @ 6 litres/hour
2 engines (full throttle @ 3200 RPM): 8.5 knots @ 14 litres/hour
Suffice to say, I rarely use more than one engine at a time and I rarely go above 2400 RPM.
