TABLE 6 - COMPARISON OF MEASURED MEAN PRESSURE COEFFICIENTS AT DESIGN 

 CONDITION WITH AND WITHOUT SAND ON BLADE LEADING EDGES 



Gage 



x/c 



r/R 



Propeller 4718* 



Propeller 4679 + j 



C P 



w/o sand- 



largest 



C P 



w/o sand- 



largest 









w/o sand 



w/sand 



a 



w/o sand 



w/sand 



a 



1 



0.900 



0.500 



-0.0189 



-0.004 



0.004 



-0.0492 



-0.001 



0.003 



2 



0.700 



0.500 



-0.1662 



-0.001 



0.006 



-0.0489 



-0.002 



0.004 



! 3 



0.500 



0.500 



-0.2957 



-0.013 



0.006 



-0.0737 



0.001 



0.003 



4 



0.350 



0.500 



-0.2152 



-0.003 



0.008 



-0.0651 



0.003 



0.003 



5 



0.200 



0.500 



-0.2308 



-0.009 



0.007 



-0.0712 



0.003 



0.003 



6 



0.080 



0.500 



-0.1932 



-0.008 



0.008 



-0.0187 



-0.012 



0.002 



7 



0.030 



0.500 



-0.0184 



-0.029 



0.010 



-0.0015 



-0.017 



0.005 



8 



0.900 



0.700 



0.0065 



0.003 



0.003 



-0.0055 





0.005 



9 



0.700 



0.700 



-0.0632 



0.000 



0.002 



0.0422 



0.000 



0.004 



10 



0.500 



0.700 



-0.0949 



-0.001 



0.003 



0.0106 







11 



0.400 



0.700 



-0.0765 



0.000 



0.002 



0.0094 



-0.001 



0.004 



12 



0.300 



0.700 



-0.0774 



0.003 



0.004 



0.0338 



0.002 



0.001 



13 



0.200 



0.700 



-0.0813 



-0.003 



0.003 



0.0363 



0.002 



0.003 



14 



0.100 



0.700 



-0.0661 



-0.001 



0.004 



0.0053 



-0.010 



0.005 



15 



0.030 



0.700 



-0.0173 



-0.041 



0.009 



0.0207 



-0.018 



0.002 



16 



0.800 



0.900 



-0.0051 



0.001 



0.001 



-0.0029 



0.000 



0.003 



17 



0.600 



0.900 



-0.0335 



0.000 



0.001 



0.0035 



0.001 



0.002 



18 



0.400 



0.900 



-0.0458 



-0.001 



0.003 



0.0162 



0.001 



0.002 



19 



0.200 



0.900 



-0.0261 



0.008 



0.003 



-0.1043 







20 



0.075 



0.900 



-0.0217 



-0.005 



0.003 



-0.0273 



-0.003 



o.ooi ; 



21 



0.030 



0.500 



0.0073 



-0.007 



0.008 



-0.1714 



-0.003 



0.006 



22 



0.080 



0.500 



-0.0015 







-0.2064 



0.022 



0.019 



23 



0.200 



0.500 



-0.2687 



0.001 



0.004 



-0.2416 



-0.009 



0.021 



24 



0.350 



0.500 



-0.3240 



0.004 



0.006 



-0.2981 



0.001 



0.029 



25 



0.500 



0.500 



-0.4447 



0.009 



0.016 



-0.3340 



0.008 



0.007 



26 



0.700 



0.500 



-0.4220 



0.009 



0.008 



-0.3762 



0.007 



0.012 



27 



0.900 



0.500 



-0.0862 



-0.011 



0.003 



-0.1513 



-0.007 



0.011 



28 



0.030 



0.700 



-0.0840 



-0.025 



0.004 



-0.1933 



-0.009 



0.003 



29 



0.100 



0.700 



-0.1081 



0.001 



0.002 



-0.1335 



-0.005 



0.006 



30 



0.200 



0.700 



-0.1799 



-0.005 



0.005 



-0.1332 



0.014 



0.015 



31 



0.300 



0.700 



-0.1631 



0.002 



0.006 



-0.1328 



0.001 



0.002 ! 



1 32 



0.400 



0.700 



-0.1867 



-0.003 



0.007 



-0.1456 



0.000 



0.001 



33 



0.500 



0.700 



-0.1739 



0.005 



0.008 



-0.1611 





0.007 



34 



0.700 



0.700 



-0.1700 



-0.010 



0.005 



-0.1837 



-0.005 



0.006 



35 



0.900 



0.700 



-0.0306 



-0.002 



0.002 



-0.1384 



-0.005 



0.003 



36 



0.075 



0.900 



-0.0707 



-0.005 



0.002 



-0.0946 







37 



0.200 



0.900 



-0.1112 



0.005 



0.003 



-0.1209 



0.029 



0.031 



38 



0.400 



0.900 



-0.1209 



-0.001 



0.002 



-0.1702 



0.001 



0.005 



39 



0.600 



0.900 



-0.0963 



0.000 



0.001 



-0.1482 



0.000 



0.006 



40 



0.800 



0.900 



-0.0963 



-0.003 



0.001 



-0.1083 



-0.007 



0.001 



*\ 



= 2 

 .7 



79 x 1( 



) 6 . 













+ \ 



= 5 

 .7 



1 x 10 f 



'• 













209 



