Can't Remember Speed Formula

Quillan · 02-01-08, 05:00 PM

Assuming you use metric measurements, distance covered in hundreds of meters = speed in knots if you time it for 3 minutes 15 seconds. I never bothered to figure out the time frame for Imperial measurements but it should be easy enough with a calculator.

1 nautical mile=1852 meters, and I think I'll go with this since SH4 is based around metric units with a built in converter to Imperial measurments. Assume a target is going exactly 9 knots, and you want to calculate the interval t where the distance covered in t time equals 900 yards.

9 knots = 16668 meters per hour.
1 hour = 60 minutes.
Therefore, 9 knots = 277.8 meters per minute.
1 yard = 0.9144 meters.
Therefore, 277.8 meters per minute = 303.8 yards per minute.
900/303.8 = 2.96 minutes, or 2 minutes 58 seconds to cover 300 yards.

Mark point on map, start stopwatch. Mark point again 2 minutes 58 seconds later. Measure distance between points. Distance covered in hundreds of yards is speed in knots.

This is, of course, assuming my math is correct.

Torpex752 · 02-01-08, 05:12 PM

Speed X 100 = distance travelled in 3 min

Distance travelled in 3 min / 100 = speed.

Frank

02-01-08, 05:00 PM	#1
Quillan Samurai Navy Join Date: Apr 2005 Posts: 579 Downloads: 2 Uploads: 0	Assuming you use metric measurements, distance covered in hundreds of meters = speed in knots if you time it for 3 minutes 15 seconds. I never bothered to figure out the time frame for Imperial measurements but it should be easy enough with a calculator. 1 nautical mile=1852 meters, and I think I'll go with this since SH4 is based around metric units with a built in converter to Imperial measurments. Assume a target is going exactly 9 knots, and you want to calculate the interval t where the distance covered in t time equals 900 yards. 9 knots = 16668 meters per hour. 1 hour = 60 minutes. Therefore, 9 knots = 277.8 meters per minute. 1 yard = 0.9144 meters. Therefore, 277.8 meters per minute = 303.8 yards per minute. 900/303.8 = 2.96 minutes, or 2 minutes 58 seconds to cover 300 yards. Mark point on map, start stopwatch. Mark point again 2 minutes 58 seconds later. Measure distance between points. Distance covered in hundreds of yards is speed in knots. This is, of course, assuming my math is correct. __________________ We, the unwilling, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little, that we are now qualified to do anything with nothing.

02-01-08, 05:12 PM	#2
Torpex752 Lieutenant Join Date: Mar 2006 Location: Deep River, CT Posts: 255 Downloads: 1 Uploads: 0	Speed X 100 = distance travelled in 3 min Distance travelled in 3 min / 100 = speed. Frank