-8- 



Pigures 22 to 31„ It was assumed that minimum target drag at 

 high speeds would be of most interest, therefore, for each 

 target, only the model condition for each displacement which 

 gave minimum resistance at a full-scale speed of 30 knots was 

 used in estimating the full-scale target drag and cable tension 

 presented in Figures 22 to 31 „ The cable lengths were deter- 

 mined by computing 0, the angle of the cable with the horizontal 

 at the trailing end, from the relationship tan = ^d^l^etisWe* 

 and determining the corresponding ^abfe ( ieng tn°( full- scale) ratl ° 

 at the various speeds from Figure 32 „ This figure was computed 

 by the method given in Reference (5)„ The full-scale target 

 drag was derived from the model data by the use of the Schoenhe rr 

 frictional resistance formulation. See the appendix for details 

 and a typical example of the computations 



In connection with the possibility of self -propelled 

 targets at high speeds s the tests on the boat- type and the TMB- 

 design targets were extended to a full-scale speed of 60 knots . 

 The results of computations of full-scale target resistances 

 based on these tests are shown in Figures 33 and 34 „ For 

 speeds up to and including 30 knots full scale 9 the data were 

 taken from Figures 26 to 31 For full-scale speeds of 35 knots 

 and above, the computations were made using the model conditions 

 that gave minimum resistance at the various speeds,, 



