568
Molesworth’s pocket-book
Approximate Rules for Paddle Steamers.
V = Velocity in knots per hour.
HI’= Indicated horse-power (total). n
8 =s Sectional area of ship In square feet (immersed).
a/i H P ..
a = Krom 460 in, small vessels »ot built for high speed.
— io 650 in small vessels-with fine lines.
— 560 in large vessels not built for speed.
__ ggg j( t( with fine lines.
- HP
Diameter of Paddle-wheels.
D = Effective diameter of paddle-wheel in feet.
d = Diameter of rolling circle ot paddle-wheel in feet.
V = Velocity of ship in knots per hour.
= Velocity in miles per hour.
jj, — Ji umber ot revolutions per minute.
45 V
R- J}
39 V
' * 45 V
39 1?
d = TT
32-25 V
d-—--—
K
28 V
d~ IT’
The diameter of paddle-wheels varies from 5 times the
stroke ot the engine in last vessels to 3 timet the stroue m
Blow.
Useful Memoranda for Steamships.
Cube feetot ^cement X ;0279 = ^ns fresn water.
Miles X -87= knots.
Knots X 1’15 = miles.
h pet ner minute X’01 = knot* per hour.
S&Ä 5 ÄKÄ
1 ndicatca 11 r A 111 bs. per horse-power per hour.
X ’ 02143 = ditto at 2 lbs.
” x • 02679 = ditto at 2i lbs.