TABLE 1 

 Offsets and Orientation of Hot-Wire Probes on Tanker Model 



The model length is 25.5 feet and draft Is 15.7 Inches 



Probe 

 Number 



' ' 



X 

 inches 



y 



inches 



e 



degrees 



Probe 

 Number 



X 



inches 



y 



inches 



9 



degrees 



1 

 2 

 3 

 4 



5 

 6 



7 

 8 

 9 



10 

 n 



12 



13 

 14 



15 

 16 



17 



18 



5.62 



5.00 



5.62 



11. 87 



n. 93 

 18.50 

 18.37 

 18.30 

 24.87 

 24.75 

 24.12 

 37.75 

 37-50 

 37-30 

 36.30 

 50.00 

 49.87 

 48.25 



12.0 

 7-0 

 1 .0 



10.0 

 4.0 



13-0 

 7-0 

 1 .0 



11 .0 

 6.0 

 1 .0 



13. c 



10.0 

 6.0 

 1 .0 



13-0 

 8.0 

 1 .0 



6 

 28 

 37 

 11 

 28 



8 

 22 

 33 



9 

 22 

 33 



4 



6 



17 

 30 



2 



5 

 20 



19 

 20 

 21 

 22 



23 , 

 24 



25 

 26 



27 

 28 

 29 

 30 

 31 

 32 

 33 

 34 

 35 

 36 



62.40 

 62.25 

 61.37 

 74.25 

 74.12 

 73.18 

 94.00 

 93.87 

 93.00 

 122.37 

 122.25 



121.37 

 157.75 

 157-62 



156.75 



182.25 



182.12 



34.30 



13.0 

 8.0 

 2.0 



13.0 

 8.0 

 1 .0 



13.0 



8.0 



1 .0 



14.0 



10.0 



1-5 



13.0 

 6.0 

 2.0 



13.0 



4.0 

 0.0 





 3 



15 

 

 



10 

 

 

 

 

 

 

 

 

 

 



1 







Definitions: 



x is the arc-length along a water line from the stem of the model to the hot-wire end of probe. 



y is the height of the hot wire above the base line . 



9 is the angle of the flow with respect to a water line; taken as positive when flow is di- 

 rected toward the bottom. 



expected that the determination of the extent of the laminar region by means 

 of the hot-wire response alone is sufficiently accurate for the present quali- 

 tative study of the 'effects of various stimulators on the boundary-layer flow. 



To insure that the fluctuations recorded from the hot-wire circuit 

 were not originating from vibration of the probe or the wire itself two checks 

 were made. A separate wire was mounted on a strut and towed about 18 ft to 

 one side of the model. For the same signal amplification no response was ob- 

 tained from this wire while at the same time wires in the boundary layer of 



