THE PROBLEM OF THE HULL AND ITS SCREW PROPELLER. 203 
2L. A. B.+H=33.89 
Si=-222 
14 1 
82 1 
.0221 | 1 
.0632 | 1 
LAURA OG MEDS SIN Sra a ND 4,572 
DAS) UNH ok AMD eUA EN CRAR VE, 778 
1 ePaper get Ud DCN sTAUSN PRES eA 35.11 
Oa De RRM ah ETP 13.65 
DIB IW Ss teal a ear A ca SN CAN 26,025 
1 BARK CR nett tty MEE ARNO es Mts sh 525 
| std yd ERM Me a aan a 13,663 
7 ops I eae ys Ve se ARUN? 23,943 
Analysis. 
S. H. P.g Revs. 
| 4g S Ss 
Est. Act Est Act 
707 | 800 | +1.255 | .222 | .1179 | 185.7 | 184 
1735 | 1800] + .894 | .222 | .1260 | 249.9 | 249.9 
3624 | 3900| + .62 | .222| .1401 | 317.4 | 310 
7910 | 8300 | + .388 | .222 | .1792 | 399.1 | 389 
14934 | 15000 | + .2 222 | .2195 | 489.6 | 468 
22755 | 23000 | + .032 | .222 | .2271 | 565.1 | 563 
27695 | 27500 | + .0 222 | .2594 | 626.6 | 623 
28953 | 29400 | + .0 222 | .2669 | 652 | 655 
These vessels begin squatting at about 20 knots and, when the struts are 
properly located so that no eddying with consequent reduction of pressure occurs, 
an increase in wake over the normal is generally encountered, resulting in a slowing 
down of actual revolutions below the estimate. The tip speed of the propeller 
at 35 knots was 16,050 feet with an effective thrust per square inch of projected 
area of 16.9 pounds, both figures being exceptionally high. 
VESSEL K. 
This vessel is of the dreadnaught type and has propellers of such character- 
istics as to plot her performance considerably below curve B, Fig. 7. Her hull is 
of type I. 
B+L. L. W. L.=.168 
Nom. B. C.=.622 
B. C. on C—D=.586 
Propeller. 
Nim ber qe anaie any Oe) dey 4 
1 Bal Fevo Levis NA oa tuN Ba AL on 2 
| toy ragl wey eyes ees Miser eta ee ae Standard 
FD) aR NEG OAR MERC AD ae 9.583’ 
TUONO a 8.193’ 
AAR SIS) UAC ee str Ui 501 
*The data omitted are confidential and therefore cannot be made public. 
