64 AEROPLANE PERFORMANCE CALCULATIONS 



log. 



| M^ f(q + g , X q - t, 



*{ 2a*i \(a - .X + * 



T - 

 ' X 10g < t+^T^o} + 5t 10g < ((a t Sa - S 



.-. /= 1-151 ^rfi+- 



This equation with the aid of (a) gives the required length 

 of run to get off the deck. 



Getting off the Ground. From this we can get the length 

 run to get off the ground in still air by putting v w = o : we" get 



Landing on a Deck. We will use the same notation as in 

 the previous piece of work, remarking, however, that as the pilot 

 has to approach the deck with caution, v mt his speed of alighting, 

 will be his minimum flying speed throttled for horizontal flight, 

 i.e. his proper " slowest flying speed," which has been discussed 

 on page 50. 



Also we now have T = o and the motion is one of decelera- 

 tion, not acceleration. Then, following the general method of 

 the previous investigation, we have 



^ ) - - KV2 w 



*) _ dx 



- X dx 

 V - v, + x . . . . (3) 



and / = (V - 



(V - tv 

 ' dx '- 



.dx 

 x dx 



(V - 



dt- 



