Lehman and Kaplan 



SCREW BTl. CYLINDRICAL SECTION OFFSETS FROM PITCH LINE. %MAXt 



RAO 



FROM MAX. t TO T.E. MAX % DISTANCE FROM MAX THICKNESS TO L.E RAD 



T.E 80 



60 40 I 20 



20 



40 : 60 ! 70 



80 85 



90 95 L.E 



095 - 



rACE 



71-0 87-?!56-8 



87 ■ 37I-O160-6 49-6|41.9|34-9|?7-4il9-6 



0-90 



BACK 

 FACE 





69-Ole6-?196-5 



■; i 69-0 | 57 -8,44-; 



30-3 22-3 | l3-9 



090 



BACK 

 FACE 



8-8 Ul'S 



orfrrz 



67- 2 1 85 '4 96-3 



96-3 85-4 67-2;55-3 41-6 34-1 



?6irij7_i7j8_i8 

 



080 



■0-&\?\- I 'lOT 



3ACK 

 FACE 



IO-dj45-4| 

 4 "4 I -2 



9£'8 , 86-7 , 627, 5 9-046-3 39-2 

 ' To- 2 



0-70 

 0-6O 

 0-50 

 0-40 

 0-30 

 20 



FACE 



l7-4.,43il 

 2 -41 5-5 



57J 



89 74 -7 65-9 



r o ; cHo-s 



40- 6,3l-0!l8- 



:1^ 



BACK 

 FACE 



74-8i834 

 4-6T I -el 



9''-8. 907, 73-7 70-6 



0-3. 0-9 I- 



39:_6,24-^ 

 9-4[i8-7 



0-40 



SACK 

 FACE 



Z6_9 ?0-„3 

 6 -9 I 2-5 



_97^7 

 5 



i00_ 9a-0'91-6:80- S73-3 

 0-2 1-3! 3-0- 4-5 



i3 50:O'' 

 ■7l8-4; 



0-6 l4-5i?3-9 



0-30 



BACK 

 FACE 



j^?:£.82-6 75-8 

 2-0- 4-8r7-0 



67-6l6S-7l56-7f43-5!35-4 



I4-9II9-IIC8-6 



0-20 



BACK 

 FACE 



j8-9i63-0 

 36-n2l-0 



80-5i9l-9:99- 



lO-S! 4-l| 0'9 



0-6, 2-8 



34- 4 ; 78'3 70-! 

 6-6; 9-5|l3-i 



60-8l53-8Ui 



l9-0|?3-6;33-4j 



SCREW BT. 2. AS BT 1. WITH t INCREASED 100% P REDUCED 7^2% 



SCREW BT3 AS BT t WITH t INCREASED 50% 

 SCREW BT.4 AS BT 1 WITH t INCREASED 100% 



P UNALTERED 



Fig. 2 - Test propellers 



one another very easily if a force is applied to either plate in a direction normal 

 to the weak sides of the unit. Forces applied in any other direction result in ex- 

 tremely small deflections of one plate relative to the other because of the in- 

 creased stiffness of the unit in all other directions. 



In certain instrumentation application the weak sides of the sensing elements 

 are strain gaged; in other applications the coil of a linear differential trans- 

 former is attached to one plate and the core to the other plate. Either of these 



172 



J 



