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Conversion From Lb To HP (thrust)  
User currently offlinePavlin From , joined Dec 1969, posts, RR:
Posted (8 years 4 months 2 weeks 18 hours ago) and read 16996 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?

3 replies: All unread, jump to last
 
User currently offlineTimz From United States of America, joined Sep 1999, 6837 posts, RR: 7
Reply 1, posted (8 years 4 months 2 weeks 5 hours ago) and read 16961 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?


User currently offlinePavlin From , joined Dec 1969, posts, RR:
Reply 2, posted (8 years 4 months 1 week 6 days 22 hours ago) and read 16934 times:

that is way I have written the topic in first place. An-22 has around 60000 horspower. That should do for the acceleration

User currently offlineRsbj From United States of America, joined Jan 2006, 152 posts, RR: 0
Reply 3, posted (8 years 4 months 1 week 6 days 19 hours ago) and read 16921 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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