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 Conversion From Lb To HP (thrust)
 Pavlin From , joined Dec 1969, posts, RR: Posted Sat May 20 2006 14:51:37 UTC (8 years 10 months 1 week 5 days 15 hours ago) and read 18464 times:

 We all know that we can't convert directly beetwen one another. But unwritten rule is that 1 lb of thrust equals 2 HP. But there is a big difference when you compare A340 and An-22. They have almost same MTOW 250.000 kg (An-22 has less speed), but the A340-200 has 4 30000 lb thrust engines. AN-22 has 4 15000 HP engines. So the A340-200 would have around 240000 HP versus only 60000HP for An-22 at very similar performance. So why the big difference?
 Timz From United States of America, joined Sep 1999, 6958 posts, RR: 7 Reply 1, posted Sun May 21 2006 03:45:00 UTC (8 years 10 months 1 week 5 days 2 hours ago) and read 18429 times:

 Quoting Pavlin (Thread starter):But unwritten rule is that 1 lb of thrust equals 2 HP.

So the An-22 has 30000 lb of thrust by the unwritten rule... which makes its acceleration 1 knot per second at MTOW?

 Pavlin From , joined Dec 1969, posts, RR: Reply 2, posted Sun May 21 2006 11:14:39 UTC (8 years 10 months 1 week 4 days 18 hours ago) and read 18402 times:

 that is way I have written the topic in first place. An-22 has around 60000 horspower. That should do for the acceleration
 Rsbj From United States of America, joined Jan 2006, 153 posts, RR: 0 Reply 3, posted Sun May 21 2006 13:51:18 UTC (8 years 10 months 1 week 4 days 16 hours ago) and read 18389 times:

 I've heard the conversion is around 3 to 5 : 1. 2:1 may be accurate at zero airspeed. Prop decay factors into the equation too. At 0 knots, the ratio would be less than at cruise speed because a prop loses power as speed increases. Turbofans do too, but not as much; though I do not know the percentage differance.
 I fly really fast and take a lot of chances.
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