Simran instruction manual Figure Capacity nomogram for Reversible Pump, RPU80/RPU160/RPU300

Measurements and calculations for applying the RPU

Recommended rudder time: 10-15 seconds is normal for a 70° (35°-0-35°) rudder angle. (The time will be shorter for smaller angles and longer for larger angles.) A longer rudder time (20 sec.) should be chosen if the boat has a quick response.

Example:

The stroke length is measured to be 20 cm, D = 5.0 cm and d = 1.8 cm

	20(52	− 1,82 )π	3
The cylinder volume is:			= 340 cm
		4

From the nomogram we find that the estimated rudder time in seconds, hard over to hard over, will be 7 seconds for RPU300, 13 seconds for RPU160 and 25 seconds for RPU80.

1000

60

55
50
45
40
35
30
25	CAPACITY
20
15	(CYLINDER)RAM
10
5

900

800

700

600

500

400

300

200

100

		)
		.
		in
		3/m
		m
	c
	0
	0
	0
	(3
0
0
3
U
P
R

													3			.)
															in
													/m
												m
											c
										0
									0
							6
						1
					(
				0
			6
		1
	U
P
R
												3				.)
														in
								0 cm					/m
						0
			0 (8
		8
	U
P
R

5 6 7 10 15 20 25 SEC.

REVERSIBLE PUMP UNITS RPU80/RPU160/RPU300, CAPACITY NOMOGRAM AT 10 BAR PRESSURE. RUDDER TIME (SEC.) H.O. TO H.O. FOR A GIVEN CYLINDER VOLUME.

Figure 2-1

Capacity nomogram for Reversible Pump

RPU80/RPU160/RPU300

Based on the above calculation and the nomogram, the recommended pump type should be RPU160.

20220422N 13

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