9'^— k- 



_^ 



Longitudinal No. 5 



] i Longifudlnol No.4 



I y^ I 



3-0" Buttock 



'V- 



BIkd 94 



Plan View 



I^Stalff 



({^ Station n..^^^ 



/4-({^ Station nr 



(See note 3 



^ Stationl^ 



-— ^ Stationll 



r-Longitudinol No.5 

 \r Longitudinal No.4 



^iOTES: 



\. Pitot-static tube al Station I extends up to 24 in. from hull. 



2. Pitot-static tubes at Stations II and III extend up to 18 in. from hull. 



3. Condenser scoop throat cross section at Station IV approximately 

 23 in. by 15',2 in., 2-in. radius at coiners. 



4. 'lanometer board for Stations I to IV located in forward fireroon. 



5. Angles given are those measured after installation. 



6. Reference: BuShips Plan Numbers DD828-8700-243G25 and 243631. 



I ■ I I I 



Longjtudinol No.5 



BIkd 94 I Fr84 



Elevation at 3-0" Buttock, Looking to Port Section at Frame 84, Looking Aft 



Figure 3 — Pitot-Tube Locations in Forward Fireroom 



and 4. The pitot tubes at Stations I, V, and VI could be extended from to 24 inches in a 

 direction approximately normal to the hull surface. The pitot tubes at Stations II and III 

 could be extended from to 18 inches. (Station IV was a conventional Prandtl tube located in 

 the throat of the condenser scoop.) The tangent planes to the hull surface at the measuring 

 stations were approximately parallel to the axis of the vessel. Thus, the pitot tubes were 

 extended in a direction normal to this axis. The direction of flow (in planes perpendicular to 

 the pitot tube) was measured at each extension of the pitot tube by rotating the tube until 

 equal static pressures were obtained at the two static holes. The static pressures were 

 indicated on a manometer located near each of the pitot-tube stations to facilitate making the 

 directional measurements. The flow direction was measured from a line parallel to the center- 

 line of the vessel. After the pitot tube had been aligned with the flow, valves were adjusted 

 to transmit the static pressure and total pressure to a centrally located manometer board. A 

 velocity and direction calibration was made at the Model Basin by mounting the pitot tubes 

 on Towing Carriage 5. 



Special back-lighted multiple U-tube manometer boards were used to measure the 

 velocity pressure. One manometer board was located in the forward fireroom and one in the 

 forward engineroom. Tetrabromethane (specific gravity~3.0) was used as a manometer 

 fluid for the 5- and 10-knot measurements. Each manometer board was photographed with a 

 modified Eastman 35mm Recordak camera. The cameras were triggered simultaneously. 



