Joined
·
87,689 Posts
- Reaction score
- 825
I found a wonderful old post by WarpP:
"I had a 8V71 take off after it warmed up, because someone put three of the oil rings in upside down. By the time we got the plywood against the turbo intake, 10 seconds, it was screaming at 3000 rpm and climbing. The emergency air shut on the supercharger was too far on to the engine to grab, thank god for that piece of plywood. Very impressive, a ton of iron trying to destroy itself and there is no way of escape."
Good to know.
I have a question about 8V71TI diesels (8 cylinders, 71cc per cylinder, turbo charged).
What is the optimal cruising speed and maximum range of the following Deep V planing hull?
1. Fuel tank 4000 liters (879.8769932 UK Gallons)
2. LWL 48.031496063 feet
3. Beam 4.3 Mts
4. Draft 1.52 Mts
5. Gross Tonnage 31.63
6. Total Engine Power 656.48 kW. (880 Hp)
Assuming the useable capacity of the tank is 87% of the maximum, that would provide 765.49 UK gallons (3480 liters).
For optimal cruising speed do you take the square root of LWL
(6.93047589008143) and multiply it by 1.34 as you would for a full displacement hull? 9.28 knots.
As it is a Deep V planing hull, do you multiply the square root of LWL by 2 giving 8.31 knots?
It seems from Stapletons Power Boat Bible that V471 normally aspirated engines with 55mm injectors needed 11,355 liters to cover 3,818 nm in 460.8 hours of running time.
Adding 8 UK gallons per hour for each 5mm increase in the size of the injectors does not answer the question because they are four cylinder engines.
If anyone can figure out what the optimal cruising speed (for maximum range) would be, and what the maximum range is, that would be great
"I had a 8V71 take off after it warmed up, because someone put three of the oil rings in upside down. By the time we got the plywood against the turbo intake, 10 seconds, it was screaming at 3000 rpm and climbing. The emergency air shut on the supercharger was too far on to the engine to grab, thank god for that piece of plywood. Very impressive, a ton of iron trying to destroy itself and there is no way of escape."
Good to know.
I have a question about 8V71TI diesels (8 cylinders, 71cc per cylinder, turbo charged).
What is the optimal cruising speed and maximum range of the following Deep V planing hull?
1. Fuel tank 4000 liters (879.8769932 UK Gallons)
2. LWL 48.031496063 feet
3. Beam 4.3 Mts
4. Draft 1.52 Mts
5. Gross Tonnage 31.63
6. Total Engine Power 656.48 kW. (880 Hp)
Assuming the useable capacity of the tank is 87% of the maximum, that would provide 765.49 UK gallons (3480 liters).
For optimal cruising speed do you take the square root of LWL
(6.93047589008143) and multiply it by 1.34 as you would for a full displacement hull? 9.28 knots.
As it is a Deep V planing hull, do you multiply the square root of LWL by 2 giving 8.31 knots?
It seems from Stapletons Power Boat Bible that V471 normally aspirated engines with 55mm injectors needed 11,355 liters to cover 3,818 nm in 460.8 hours of running time.
Adding 8 UK gallons per hour for each 5mm increase in the size of the injectors does not answer the question because they are four cylinder engines.
If anyone can figure out what the optimal cruising speed (for maximum range) would be, and what the maximum range is, that would be great
