Convert Furlong per Fortnight to Earth Escape Velocity
Convert Furlong per Fortnight (fur/fn) to Earth Escape Velocity (v_esc) instantly and accurately.
Conversion Formula
v_esc = fur/fn × 1.486764919e-8
About Furlong per Fortnight
A furlong per fortnight (fur/fn) is a deliberately archaic unit equal to exactly 201.168 ÷ 1,209,600 m/s ≈ 1.663 × 10⁻⁴ m/s - just slightly faster than a garden snail at full creep. One furlong (one-eighth of a mile = 201.168 m) and one fortnight (14 days = 1,209,600 s) are both perfectly legitimate historical measures, but their combination is cherished in physics teaching as a cautionary example of needlessly exotic unit choices. Expressing kinetic energy in kg·fur²/fn² or force in kg·fur/fn² illustrates instantly why the SI was universally adopted. The unit appears in satirical physics papers, recreational mathematics columns, and Terry Pratchett's Discworld novels as the native velocity unit of magical phenomena. The speed of light expressed in furlongs per fortnight is approximately 1.803 × 10¹² fur/fn. Snails travel at roughly 0.5-1 fur/fn; strong tidal rip currents reach 100-200 fur/fn. 1 fur/fn ≈ 1.663 × 10⁻⁴ m/s ≈ 0.599 km/h ≈ 0.372 mph.
About Earth Escape Velocity
Earth's escape velocity = 11,186 m/s at the surface - v_esc = √(2GM/r). A spacecraft launched at this speed (any direction) escapes on a parabolic trajectory; less gives an elliptical orbit. Apollo's trans-lunar injection exceeded this to reach the Moon. Voyager, Pioneer, and New Horizons all exceeded 11.2 km/s at launch. Moon escape velocity 2.38 km/s; Mars 5.03 km/s; Jupiter 59.5 km/s. 1 Earth v_esc ≈ 11,186 m/s = 40,270 km/h.
Quick Reference Table
| Furlong per Fortnight (fur/fn) | Earth Escape Velocity (v_esc) |
|---|---|
| 1 fur/fn | 1.487 × 10-8 v_esc |
| 2 fur/fn | 2.974 × 10-8 v_esc |
| 5 fur/fn | 7.434 × 10-8 v_esc |
| 10 fur/fn | 1.487 × 10-7 v_esc |
| 25 fur/fn | 3.717 × 10-7 v_esc |
| 50 fur/fn | 7.434 × 10-7 v_esc |
| 100 fur/fn | 1.487 × 10-6 v_esc |