40 HP AT 6000 RPM

[Bennett]

1990 60 Hp Johnson VRO. 40 MPH at 6000 rpm's is this about right ?

 

[R.Johnson]

Re: 40 HP AT 6000 RPM

It depend's on what type of boat your pushing, but that sound's like a good set-up to me.

 

[Bennett]

Re: 40 HP AT 6000 RPM

16 ft Bass

 

[Dhadley]

Re: 40 HP AT 6000 RPM

Yep. <br /><br />Assuming;<br />Your tach is correct --<br />Your using a 17" prop --<br />And you are at less than 1% slip.

 

[steviecops]

Re: 40 HP AT 6000 RPM

Dahdley<br />Obviously there must be some formula that you used to reach your conclusion.<br /><br />I don't have a tach fitted to my boat yet, could I find out what my revs are by using this formula with all the information that I do have?<br /><br />I'm running a two cylinder 55 hp Johnson on a hefty 17ft tri hull boat. My top speed is just over 30 mph and my prop is 11 3/4 X 17.<br /><br />Thanks<br />Steve

 

[Dhadley]

Re: 40 HP AT 6000 RPM

Ah ha! We dont know the tach is correct since there isnt one! Lol!<br /><br />Sreiously, we could come close but we'd only be guessing at the slip %. It could be 12% or 20% or.......<br /><br />We can calculate the slip but we have to know the correct rpm's, correct speed (that is speed by a GPS, right?) and the gear ratio. Thats how we achieve efficiency, reducing the slip %.<br /><br />Pretty good guess on the pitch size, huh?