Yes. He collecting better numbers on current performance when he can. One of the mistakes made was wiping the engine performance display. Once he has that synced again data collection should be easier.
I told him that “the only way to get good fuel consumption is to fish on someone else’s boat”.
Optimax improvements prop, rpm, gph
- Jaysen
- * Bateau Builder *
- Posts: 6520
- Joined: Wed Aug 05, 2015 7:59 am
- Location: St Helena Island, SC
- Contact:
Re: Optimax improvements prop, rpm, gph
Re: Optimax improvements prop, rpm, gph
Jaysen here is one thing you can do and that is a speed chart vs. rpm vs. mileage, this will show him where his sweet spot is.
Set up a course 1 mile long and run it both ways and set your rpms for a constant amount. To keep it short start at 3000rpm. Do it it on as calm as day as possible and if wind is present one upwind and one down wind.
RPM's Speed(MPH) GPMile
3000
3200
3400
3600
3800
4000 32 8
4200
4400
I am looking for 3 things here.
Fuel efficiency
Propeller efficiency
Fuel economy
The other thing I absolutely need is the Brand, Name Of and Diameter x 15 pitch of the propeller. The reason for this is if he has a prop that is forcing his bow down instead of stern up he is losing efficiency. There are a lot of nuances in choosing the correcting a prop especially in these smaller boats. The info will be on the barrel on in his sales papers. Something like Mercury, Mirage Plus, 15.5 x 15. I hope he has it pulled out of the water.
Hope you can talk him into doing this.
Regards, Tom
Set up a course 1 mile long and run it both ways and set your rpms for a constant amount. To keep it short start at 3000rpm. Do it it on as calm as day as possible and if wind is present one upwind and one down wind.
RPM's Speed(MPH) GPMile
3000
3200
3400
3600
3800
4000 32 8
4200
4400
I am looking for 3 things here.
Fuel efficiency
Propeller efficiency
Fuel economy
The other thing I absolutely need is the Brand, Name Of and Diameter x 15 pitch of the propeller. The reason for this is if he has a prop that is forcing his bow down instead of stern up he is losing efficiency. There are a lot of nuances in choosing the correcting a prop especially in these smaller boats. The info will be on the barrel on in his sales papers. Something like Mercury, Mirage Plus, 15.5 x 15. I hope he has it pulled out of the water.
Hope you can talk him into doing this.
Regards, Tom
Restored Mirror Dinghy, Bought OD18 built by CL, Westlawn School of Yacht Design courses. LT US Navy 1970-1978
Who is online
Users browsing this forum: No registered users and 11 guests