Wall of Wood Model 

 (TMB Model 4083) 



Side Elevation 



Transverse Section Looking Aft 



Brass Tubes Inserted in 

 Hull Used as Sockets 

 for Probe. 



Boundary Layer Thickness 

 Estimated from Flat Plate Theory. 



Horizontal Section Looking Down from Topside Full Scale 



Figure 5 - Details of Removable Hot-Wire Probe 

 Used on Tanker Model 



Thickness of laminar boundary layer computed from Equation [20] on page 52 for 

 a position 5 ft from bow at a speed of 1.0 knot. 



The first occurrence of turbulent bursts as shown in Figure 8 is taken as the 

 onset of transition. In some instances it is difficult to distinguish between 

 large laminar oscillations and low-frequency turbulence.* This uncertainty 

 might be resolved by making a pitot-tube survey to determine if the mean ve- 

 locity profile is laminar or turbulent. Although no pitot-tube surveys were 

 conducted on this tanker model, plans are underway to substantiate the hot- 

 wire response to boundary-layer flow on a flat plate by simultaneous measure- 

 ment of the boundary profile with total-head tubes. In any event, it is 



♦Records of this type were not common and were obtained at low speeds from wires placed far back 

 on the hull. 



