Dependence of various factors on bank angle (K7 solo speeds and L/D assumed)  
 
bank angle Load factor multiplier Vs Vbest Vsink radius   T_3_6_0 descent  
  (^o) (1/cos |phi|) sqt(1/cos |phi|) (mph) (mph) (m/s) (ft) (sec) (ft)  
0 1.00 1.00 33 46 0.8        
5 1.00 1.00 33 46 0.8 1624 151 394  
10 1.02 1.01 33 46 0.8 815 75 200  
15 1.04 1.02 34 47 0.8 547 50 137  
20 1.06 1.03 34 47 0.9 414 37 106  
25 1.10 1.05 35 48 0.9 335 30 89  
30 1.15 1.07 35 49 1.0 283 25 79  
35 1.22 1.10 36 51 1.1 247 21 73  
40 1.31 1.14 38 53 1.2 220 18 69  
45 1.41 1.19 39 55 1.3 200 16 68  
50 1.56 1.25 41 57 1.5 185 14 69  
55 1.74 1.32 44 61 1.8 173 12 73  
60 2.00 1.41 47 65 2.2 163 11 79  
65 2.37 1.54 51 71 2.9 156 9 89  
70 2.92 1.71 56 79 4.0 151 8 106  
75 3.86 1.97 65 90 6.0 147 7 137  
80 5.76 2.40 79 110 10.9 144 6 200  
85 11.47 3.39 112 156 30.7 142 4 394  
                   
Notes: K7 L/D = 26:1  
  Load factor is 1/cos |phi|  
  Multiplier is 1/sqrt(cos |phi|)  
  Vs is stall speed; Vs(0)*(multiplier)  
  Vbest is best L/D; Vbest(0)*(multiplier)  
  Vsink(0) is Vbest(0)/(L/D)  
  Vsink is Vsink(0)*(load factor)*(multiplier)  
  Radius is V^2/g tan |phi|, where g=32.17 ft/s^2  
  T_3_6_0 is time for a 360^o turn and equals 2|pi|r/V(|phi|)  
  descent is Vsink'*T_3_6_0  
  1 mph = 1.467 ft/s; 1 ft/sec = 0.3048 m/s  
From:  
  The Complete Soaring Pilot's Handbook, by Ann and Lorne Welch and Frank Irving  
 
 
revised 4/19/02 (corrected T_3_6_0 and descent, which were off due to a conversion factor error)  
[hanson.chem.stolaf.edu]d:\glider\speeds.wq1 (hansonr@stolaf.edu)  

Disclaimer