BigJimFX From United States of America, joined Jun 2005, 321 posts, RR: 0
Reply 1, posted (8 years 8 months 1 day 11 hours ago) and read 10742 times:
Sometimes ATC asks prop planes to make their best approach speed (fastest) when there is traffic behind them that has to go faster. (Like a 737 doing about 130-140 kts) Such a request was given to me while landing at ATL in a 172 while a A319 was behind me. Also one could say that they look faster because they have a nose low attitude because they lack leading edge slats. In reality they are normally going slower than jets but just look faster. I hope this helps. Hopefully some of our regional jet/prop pilots can shed some more light on the matter.
3DPlanes From United States of America, joined Apr 2006, 167 posts, RR: 0
Reply 3, posted (8 years 8 months 15 hours ago) and read 10502 times:
Quoting 2H4 (Reply 2): It is indeed an optical illusion. It's based on how long it takes an aircraft to travel it's own length.
I think it also has to do with our mind's built in assumption of size. When you see an airliner at a distance, your mind says "its a 737" and so you automatically guestimate the distance based on how big the plane -should- look given that it -is- a 737. But what if it was a 777?
For a 777 to -appear- as large as a 737, it must be quite a bit further away. Even if the 777 was flying at higher speed, the greater distance results in less apparent motion - so it looks like its flying a lot slower.
FLY2HMO From , joined Dec 1969, posts, RR:
Reply 5, posted (8 years 8 months 10 hours ago) and read 10478 times:
Usually, but not always, an aircraft in the heavy category will land faster on average than a smaller aircraft (ie 747 vs 737) at MLW, but the difference is small, usually within 10 kts. But its hard to tell the difference of 10kts and given the size of some aircraft their apparent speed is greatly reduced.
DISCLAIMER: I just based this on performance charts I've seen and is by no means a generalization or a hard rule.