gsturgeon
Member
It's been a general theme of this forum that diesel is the way to go, so I decided to have a look at converting my twin 220 hp petrols.
Armed with the prices quoted in MMB for D4's I built a spreadsheet with all the variables I could think of to find the payback time.
I have assumed figures that seem reasonable for my use and the results show a payback in the case of fuel with 60:40 split at 29 yrs and more likely in the future, without a split, at 46 yrs
The assumptions made were that the conversion wouldn't add to the value of the boat - the engines and boat would be very old by then, and that the conversion labour would be funded by the salvage of the petrols. The 10mph speed is due to transiting harbours, rivers, locks and marinas, my normal cruise is 20 odd kts and that diesel/petrol consumption is in the ratio 5:8. no idea of the future cost of fuel or the effect of inflation, so I ignored them.
The only way I can get any reasonable payback time ie.within the boats lifetime, is to increase the annual hours to very high values (for me) which would generate spectacular fuel costs.
I am sure I have done something wrong, but what?
Armed with the prices quoted in MMB for D4's I built a spreadsheet with all the variables I could think of to find the payback time.
I have assumed figures that seem reasonable for my use and the results show a payback in the case of fuel with 60:40 split at 29 yrs and more likely in the future, without a split, at 46 yrs
The assumptions made were that the conversion wouldn't add to the value of the boat - the engines and boat would be very old by then, and that the conversion labour would be funded by the salvage of the petrols. The 10mph speed is due to transiting harbours, rivers, locks and marinas, my normal cruise is 20 odd kts and that diesel/petrol consumption is in the ratio 5:8. no idea of the future cost of fuel or the effect of inflation, so I ignored them.
The only way I can get any reasonable payback time ie.within the boats lifetime, is to increase the annual hours to very high values (for me) which would generate spectacular fuel costs.
I am sure I have done something wrong, but what?