The Mainship comes (or has come) with several engine options
| Engine HP | RPM | Knots | Notes | ||
| Yanmar 315 | 3300* | 12 | "High Times," Full fuel ½Water, ½ Holding, 22 X 19" 4 Blade Prop, 8/28/1998 | ||
| 3000§ | 10 | ||||
| 3250* | 16.5 | "High Times", Full fuel, with new ? X ? prop | |||
| Cat 300 (3116TA) | 2900* | 15.6 | Power & Motoryacht test, ½ Fuel, ½ Water | ||
| 2700§ | 13.7 | ||||
| 2400 | 11.5 | ||||
| Cat 300 | 2800* | 16.2 | Lockwood's (data from Hank Sandy Hook Yacht Sales), ½ Fuel, ½ Water | ||
| 2600-2700§ | 11-12 | ||||
| Cat 300 | 2600-2700§ | 15.8 | Personal trial new boat prior to prep for new owner, Cove Marina, mostly full fuel, 10/6/1998 | ||
| 2400 | 10 | ||||
| Cat 300 | 2775* | 14.4 | data from Donald Jones, FL Yacht Sales, Full fuel, full water, 4 people | ||
| 2400 | 12.5 | ||||
| 1700 | 8.5 | ||||
| Cat 300 | 2900* | 15.6 | Passage Maker test, ½ fuel and water | ||
| 2700§ | 13.7 | ||||
| 2400§ | 11.5 | ||||
| Volvo? 200 twin | Top* | 18 | data from Donald Jones, FL Yacht Sales | ||
| Top Cruse§ | 15 | ||||
| Volvo 192 twin TAMP41P | 3900* | 19.3 | Passage Maker test ½ fuel and water | ||
| 3600 | 16.9 | ||||
| 3300 | 14.5 | ||||
| 3000 | 12.8 | ||||
| Yanmar 230 twin | Top* | 20 | data from Donald Jones, FL Yacht Sales, ½ fuel | ||
| Top Cruse§ | 16 | ||||
| Yanmar 230 twin | 3400-3500* | 19.8 | Personal trial on new boat prior to prep for a new owner, Florida Yacht Sales, 11/1998 | ||
| 3000§ | 16.2 | ||||
| 2800 | 15.2 | ||||
| 2600 | 13.5 | ||||
| 2400 | 11.3 | ||||
| Yanmar 230 twin | 3400* | 17.65 | 8/2000 Personal trial of boat following
owner prep and after 1 year in water, props cleaned of larger barnacles by
diver, mostly full fuel, loaded equipment, ½ water
9/2000 Same boat, props brought into spec by adding light cup to the blades missing a cup. The props are HyTorq Manganese Bronze Light Cup 1.5" Std Taper Hall & Stavert 902-566-3335 22x17 L4 and 22x17 R4 with 1 3/4" nuts. Bottom scraped, washed and paint touched up. Top speed 19 knots full fuel, 1/4 water. Max cruise 16+ knots. One way small current. See below for more complete runs. |
||
| 3000§ | 15.3 | ||||
| 2000 | 8.5 | ||||
| 1800 | 7.9 | ||||
| 1600 | 7.35 | ||||
| 1400 | 6.6 | ||||
| Engine HP | RPM | Ave. Knots | East | West | Notes |
| Yanmar 230 twin | 3400* | 18.95 | 18.5 | 19.4 | 11/5/2000 Condidtions: Same boat as above 1 month later, full fuel, empty water and holding tanks. Wind NW 25-30 Knots. Current .5 - 1 knots from the East. Runs were East and West with current dominating. Air tempurature 50. Water tempurature 60. Crew of 4. See sample pictures taken a few years later here and here. |
| 3100§ | 17.2 | 16.6 | 17.8 | ||
| 3000§ | 16.4 | 15.8 | 17.0 | ||
| 2800 | 14.75 | 14.1 | 15.4 | ||
| 2000 | 8.15 | 7.9 | 8.4 | ||
| 1800 | 8.05 | 7.9 | 8.2 | ||
| 1600 | 7.55 | 7.5 | 7.6 | ||
| 1400 | 7.0 | 6.9 | 7.1 | ||
| 1200 | 6.1 estimate | - | 6.2 | ||
| 1000 | 5.2 estimate | - | 5.3 | ||
| 750 | 4.3 estimate | - | 4.4 | ||
* Approx top RPM for the engine
§ Approx top recommended continuous cruising RPM
Personal trials were averaged of two directions. The unnamed boats were new boats with a fresh smooth bottom paint and little personal equipment. When I sea trialed "High Times", it wouldn't plane. Following my sea trial, it was tested with several props and with its new prop, its tops out at 16.5 knots. The max continuous cruise RPM for the 315 Hp Yanmar is 3000-3100. This should allow it to cruise on a plane making this a great engine-boat combination for a single.
