Bertram  - 31 (1981) - Yanmar Repower (Not Prod)

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Test Condition

Test Power: 2 x 315-hp Yanmar 6LPA-STP2 Diesel
Time To Plane 5.3 sec.
0 to 30 8.4 sec.
Test Power 2 x 315-hp Yanmar 6LPA-STP2 Diesel
Transmission ZF63A
Ratio 2:1
Props Michigan 18 x 25 4 blade broze
Load 3 pers., Fuel 107 gal., Water 12 gal , min. gear
Climate Temp: 90 deg., humid: 47%, wind: 5 mph, 10 mph: min chop

Specifications
Length Overall 30' 7''
Beam 11' 2''
Draft 2' 7''
Dry Weight 9, 400 lbs. (with fuel)
Tested Weight N/A
Fuel Capacity 220 gal.
Water Capacity 18 gal.
Bridge Clearance 8' 0''
Deadrise/Transom N/A
Max Headroom 6' 2''
Prices, features, designs, and equipment are subject to change. Please see your local dealer or visit the builder’s website for the latest information available on this boat model.
 

Test Results

Test Power: 2 x 315-hp Yanmar 6LPA-STP2 Diesel
RPM MPH Knots Total GPH MPG NMPG Range NM Range dBA
1250 8.5 7.3 2.7 3.13 272 620 539 83
1500 9.2 8.0 4.3 2.13 1.85 421 366 84
1750 10.1 8.8 6.2 1.63 1.42 323 280 85
2000 15.9 13.8 7.9 2.01 1.74 397 345 85
2250 20.1 17.4 10.0 2.01 1.74 397 345 86
2500 23.7 20.6 12.4 1.91 1.66 378 329 87
2750 26.4 23.0 14.4 1.83 1.59 363 316 88
3000 29.5 25.6 16.7 1.76 1.53 349 304 90
3250 31.3 27.2 19.1 1.64 1.42 324 282 89
3500 34.0 29.6 23.3 1.46 1.27 289 251 90
3750 35.9 31.2 26.8 1.34 1.16 265 231 90
3911 37.4 32.5 29.4 1.27 1.11 252 219 91

Performance Chart

Performance Chart

Speeds measured with Stalker ProSports radar gun. Fuel consumption (gallons per hour) measured with Floscan digital fuel-flow meter on gas inboards, sterndrives, and outboards, TechMate electronic scan tool on gas EFI inboards, Caterpillar digital fuel-flow meter on diesel engines, or permanently installed fuel-monitoring equipment. Range is based on 90% of published fuel capacity. Sound levels determined using Radio Shack digital decibel meter on A scale. 68 dBA is the level of normal conversation.