Re: Cruise and Max RPM #solution
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the TMD22 with the mechanical gearbox (2,8 reduction factor) and the autoprop h6 was probably never reached in our 20 years of SM more than 2500 2600 rpm ,
The TMD22 engine characteristic curve show that the 78 hp ( the max power) is obtained at 3500 - 4200 rpm but at 2500 the curve show 40 hp and the boat has never reached more than 7.5 knots
Now we have moved to the yanmar 110 cv, the new version of the yanmar 100) with gearbox with 2.3 rduction factor (midway betwenn the 1.97 of amel 54 with 110 volvo and 2.8 of the yanmar 100 ) that is the new version of the well known Yanmar 100 cv installed by Amel after the TMD22. In Italy due to a severe restrictions of omologation certificate we had also to afford the cost of new homologation certificate but we hare happy with this change . indeed the boat seems to go much better, it has a cruise speed of 8,5 at 2300 rpm over 3200rpm ( max engine regime) and also in the manoeuvres she is more prompt than before .
cheers and good wind .