. , (. 20.1).
20.1 :
ℓ ; -
. - V V . 1 (), (. 20.1):
V = V = 0.25 2 tg , (20.1) , ; , .
= (R L = hctgα )tg (20.2) ( = = ) (20.1)
= (R L h ctgα 0.25 )tg (20.3) h , ; α , ; L , ; , .
(20.1) , .
( L) , . L.
L :
Lmin = Z + a + 0.5Cx, (20.4) Z , ,
Z = h(ctgα ctgα), (20.5) α α , ; ( = 1.5 3 ); x , .
ℓ
R. ℓ R + m1, (20.6) m1 , (m1 = 0.4 0.6 ).
L ℓ, . max = 1.7 R. (. 20.2, ), L (L Z + a + 0.7R.). L = Lmin 0.5 + R..
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, ( 20.2, )
20.2 :
- ; ., .max . min , .
ℓ b + Z + a, (20.7) b - , (b = 2.5 22 , ).
L = Lmin (. . 20.2, )
R. + 0.5C b. (20.8)
, ℓ Z + a + Cx, L.
ℓmin 0.5Cx, (. 20.2, )
min = 0.5 + ℓmin = C. (20.9)
( 1.7 R.), .
, . 15 27 , 35/65 30 .
( ) ; .
15 3 , . , .