Duet's consumption report

Blue Bell and KapnD request this information.
Early this year when I done a dip test, we done 14.4kn at 4850 rpm with a 14x11 propelers.
This time around the maximum speed that we achived was 13.4kn at 5650 rpm with a 14x9 propelers, with 4 adults and more the half load.
3000 rpm 1 gph 6.5 kn
4000 rpm 2 gph 9 kn
5000 rpm 3.3 gph 10 kn
5650 rpm 5.1 gph 13.4 kn
As you can see, I lost 1kn, I suspect because of the increased wetted surface with the BB's and spoosons, althought I have now a longer WL
Because my speed is directly propotional to the price at the pump, my crusing speed is 6.5 kn a magic carpet ride. I will apreciate your comments and critics on the BB's that you can see on a short video here https://www.youtube.com/channel/UCWozWLnRcjBC_TvD4MnneSA

 

Fantastic PB, thank you.
Your fuel per hour, is that x2?

Are you happy?

 

BB, its x2, this numbers looks good to me.

 

Dinis ~ isn't your wot rating for Suzu 60 6300 rpm?

 

The operating range for theDF60AV is 5300-6300 rpm, whitch makes 5650 bang on.

 

Do a slip calc. I think you are not in the sweet spot for your planned speed. I am trying to learn my boat as well, but as you know, I have slightly different operating goals. I like to run about 12 knots.

When I added the extensions, I believe I also need to make some changes to my props. I, too, need to chart and check slip. But I was still dealing with spray in August and never dialed things in enough to even make a chart. Here, boats are pulled in October