Transactions Society Naval Architects and Marine Engineers, Vol. 28, 1920. Plate 75 
To illustrate paper on “The Problem of the Hull and Its Screw Propeller,” 
by Rear Adimral C. W, Dyson, U. S. N., Member. 
SHEET NO, 20 
SE ee 
Ze See 
ia Ea Se aes 
Paes 
PROPELLER DESIGN CURVES 
24-8 XEHP 
TpXPAR 3 BLADEO PROPELLER 
FN.SX). Px. 
= VT OXPAR 4 BLANED PROPELLER 
Q \eesaL ne 2BLADED PROPELLER 
TSS LIQPAR 
PA>DA2PROJECTED AREA RATIO OF 
3BLADED FROPELLER 
=XPROJECTED AREA RATIO OF 
4B8LADED PROPELLER 
t% pRosEcTED AREA RATIO OF 
2ZBLADES PROPELLER 
1} PC.= PER CENT PROPULSIVE COEFFICIENT 
CORRESPONDING TO ACTUAL 
PROJECTED AREA RATIO 
WM. J. ROGERS. LITHO. WASH. 0. Cc. 
