Fuel Economy

[basic_fisho]

Hi Chaps. My sons mate has a big plate boat with 2 95 Johnsons (i think they are.) but it is irrelavant to the question, i was always of the idea that the best economy you can get out of a boat, is get up on the plane ,and then back off the throttle until it starts to go down in the water a bit, then give it a bit more to get back up.And that was your most economical running.However the mate insists that the most economical running is 4000 revs. on the clock, Which do you chaps reckon is the best way,or is there another way,Will be interested to hear a few reports on this one. thanks in advance. :beer:

[Guest Jocool]

Your mate could be right Ben...If he has ran the gamet of fuel flow tests and worked out his speed against his fuel usage. He may have got that figure from a boat test that was done with his motor, but it may not be relavent to his boat.

I've made that about as clear as mud haven't I? :confusuion:

I always thought that it's a sweet spot where your motor didnt have to work too hard to keep you planing. Much the same as you have described!

[Ken A]

My Navman GPS has the fuel computor fitted & its very accurate so I just have a look at the reading while I am adjusting the trim / revs to suit the conditions.

Whether your boat is trimmed properly to suit the conditions makes a big difference to fuel consumption.

[clutch]

a big plate boat with 2 95 Johnsons (i think they are.) but it is irrelavant to the question,

the mate insists that the most economical running is 4000 revs. on the clock,

I'd say that it was very relevant in that put different power on the back and your optimum cruising revs will change...............i.e. and 85 hp motor would have to work a lot harder to maintain the same speed

Optimum revs are boat specific

Basic , I think your way of determining is the right way :thumbsup: