Brian wrote:

Let's see: 1/4 @ 200 ft that would be:

1/4 mile = 6040/4 = 1510 ft

1510/200 = 7.55 L/D required.

OK maybe flaps up and best L/D Speed a C-172 might have 7.5 L/D ratio.

At 60 knots, a Cessna 172 demonstrates a 12.2:1 glide ratio with flaps up.
Plenty of margin if you were in that configuration.

http://www.swaviator.com/html/issueAM00/basicsAM00.html

In my Maule, I will probably have 24 degrees of flaps down and be doing 65-70
mph. I will cover that quarter mile in less than 15 seconds, and it will take me
a few to react and drop that Johnson bar. Once I do, though, my rate of descent
will be a bit less than 500 fpm. Judging from the experiment in the above
article, the ROD of a 172 at 60 knots is also about that. Again, plenty of
margin.

George Patterson
The desire for safety stands against every great and noble enterprise.