

f\ 



POROUS TIP 



THREE TIPS - 10, 20 



& 40% POROUS 



NACA-0012 



AR = 5.41 



1.0 1- 



0.8 



0.6 



u- 0.4 



0.2 



0.05 1— 



0.04 



0.03 



0.02 



0.01 



50 



40 — 



30 — 



20 



10 — 



IT 







U = 110 ft/sec 



\ 







a = 1 2 deg 

 Rn= 4.4x105 



A 



1^^^ 





z = 4c 



_1 



r- 



^^^^^ = 



Cl^ 



TTARlCjj-Cj,^) 



- 



X- 





^^0 



- 



ALL DATA FROM 

 REFERENCE 14 



1 1 



1 



V. 



1 



10 20 30 



TIP POROSITY (% PLAN FORM AREA) 



40 



Figure 8 - Variation of Efficiency e. Drag Coefficient C , and Core 

 Tangential Velocity V. with Tip Porosity for a Porous Tip Wing 



(Data from Reference 14) 



17 



