Ok, I asked this question a few days ago. I'm writing this to try to clear up some of the confusion about what it is I'm trying to figure out.//<![CDATA[ aax_getad_mpb({ "slot_uuid":"f485bc30-20f5-4c34-b261-5f2d6f6142cb" }); //]]>

I read in a flight magazine that in order for a plane to be able to clear the runway during take-off, a plane will need to have 70 percent of its take-off speed by the time it reaches the half-way point on the runway...

I already know this to be a FACT so I am not trying prove it or trying to solve this question through the use of mathematics(it works)

The part that has me stumped is the conceptual aspect of this question...

WHY does a plane need 70% of its total take off speed by the time it reaches the halfway marker of its runway.

Hopefully i've cleared it up a bit. Thanks for all the help I've been recieving...so far it has led me to research some interesting aspects of aviation physics...but all I'm getting is mathematical solutions, no real concept help. Thanks again.

M45

**Physics Forums - The Fusion of Science and Community**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Aerospace Clearing The Runway Revisited

**Physics Forums - The Fusion of Science and Community**