Tugas Bab Mesin Kapal

Nama   : Norvita Handayani

NIM    : C44140070

Tenaga             : 40PK

Type                : origin range

Engine type     : 2-cylinder

Displacement  : 703cc

Output             : 29,4 kw /40hp

Compression Ratio: 6,0

Gear ratio        : 26:13 (2,0)

Weight                        : 7KG Bore x

Stroke              : 80x70mm

Max operating range: 4500-5500rpm.Scavenging;induction:

Loop chargingO;M Transom

Height             :424mm;16,7in

This will calculate engine torque from input BHP and RPM. Enter your data in the green boxes and the answer will appear in the yellow box.

NB  Max engine RPM should not be more than 85% of manufacturers stated max RPM unless a continuous-duty heavy marine diesel is used! NB This excludes power required by ancilliaries driven by the engine, such as hydraulic pumps or generators. NB Each extra gearbox or vee-drive will reduce power by an additional 3%.

This will calculate the Displacement Speed Formula for the hull. Speed:Length Ratio up to 1.6=displacement, from 1.6 to 2.8=semi-displacement, over 2.8=planing

703	Maximum Displacement of vessel in pounds.
6	Waterline Length of vessel in feet.
2	Required maximum speed in knots.
1,000	Speed:Length Ratio. Suggested max practical displacement hull speed for LWL input ---> 3,67 Knots
39	Shaft Horsepower available at propeller from "Torque & Shaft Horsepower" sheet
18	Pounds per Shaft Horsepower available (power/weight ratio)
1	Shaft Horsepower required at propeller
1.213	Pounds per shaft horsepower required.
For planing hulls, where C= 150 for runabout, 190 for fast, 210 for race.
140	Enter "C" for your hull.
32,9	Approx maximum speed attainable with motor data from "Torque & Shaft HP" sheet.
0	Shaft HP required for speed required at top of page.

                                                                       

2		Speed in knots required from Power Reqd page
		28		Max prop shaft rpm from Torque& SHP page
22		80% of max prop shaft rpm
203	desired speed expressed as feet per minute.
9,21	desired speed divided by max prop shaft rpm to give prop feet per minute.
110,51	Theoretical required prop pitch in inches.
94,31%	Estimated prop slip at required top speed.
215	Required prop pitch for top speed.

This is an automatic calculation from shaft horsepower and rpm at prop on Torque sheet.
16	Propeller Diameter in inches.
	15
5	Propeller Pitch in inches.
	8
0.33 mean-width ratio blades. (This means 33% of the "disc" area of prop dia is blades)
Rules of thumb.
	One inch diameter = 2.5 inches of pitch.
	Two inches extra pitch will cut engine rpm by 450.
If you can't fit the indicated diameter due to clearance, or have plenty room left, the rules
of thumb above will be a useful guide.
The alternatives in light blue squares