Just installed the Navman

Pat Anderson · Posted: Sat Feb 11, 2006 10:57 am Post subject:

You don't need an Excel spreadsheet, just a calculator...The number David didn't post is the one that you get from dividing the MPH by the GPH, resulting in MPG. Here it is:

3000 RPM = 3.478 MPG
3500 RPM = 2.526 MPG
4000 RPM = 3.125 MPG
4500 RPM = 3.229 MPG
5000 RPM = 3.114 MPG

Hence Byrdman's correct observation that it looks like David wants to avoid 3500 RPM. Now this is very intriguing - the previously published data suggests the 3500 RPM is the "sweet spot" for the Honda 150 and we have been trying to run there, especially since the 13.5 MPH is a very comfortable cruising speed. But on David's data, he is getting at least half a MPG less at that RPM than at the faster speeds.

I will get my numbers figured out and posted. But then since it is connected to the GPS, I think I will just run with the Navman set to display MPG rather than GPH. Today will be our first use of our Navman...we'll set RPM / speed for the best mileage.

Byrdman · Posted: Sat Feb 11, 2006 11:04 am Post subject:

Hey Pat and Patty! Enjoy the water today. Yep, each boat is differant, and even that boat is differant each day and changes during the day based on loads, waters, currents, winds... but really adds to the "need" for a Navman rather than just another "toy."

It is real fun to move things about on your boat....and change trims...etc.

Cheers!

Byrdman · Posted: Wed May 10, 2006 6:41 pm Post subject:

Well... putting my "wish list" together as I prepare to retro the last CD18 Angler made.... my ol faithful 1984 named C-Byrd. David and Pat...thanks for your help, your numbers, and your post. Got that Navman 3100 right up top... new main motor, some type of chart plotter (Garmin 498), Navman 3100, new 18'ish gallon fuel tank that will fit under the back area, VHF radio, ... oops. going with the 50 hp Suzuki main motor...., to match my new little 9.9 suzi....that really sips fuel while trolling along, one of those Garlick (sp?) boarding ladders with the little brackets on both sides of the boat near where the cabin top meets the gunnels as to allow me to use the handles that are already there...and maybe an another one or two...or rig up some type of rope till I use it a time or 6, .... now long term I am for sure going for another satellite radio system...but got that Mexican disease "funz-r-low".... so going to have to do a little priority list...but this one will get me going. Yep, I like what I see and have read about the 3100. Should have the motor switched out and stuff mounted in about a week...so should be able to post some mileage numbers for C-Byrd next weekend. I do appreciate all the input on these and other items.