F4U glide ratio.

[fscott]

I found this in my large airplane book. The F4U tests shown that it had a glide ratio of 13:1 to 15:1.  This tells me that if you cut the engine at 1 mile altitude, you could glide 15 miles linear distance before stalling.  I assume that's how you read that. Wish it had glide ratios for all the planes.

fscott

[straffo]

It's called also 'finesse' (in french) you but a plane at 1000 meter(not 1 mile   ) and wait her to land ... some km away for a glider  (like 50/60 for competition gliders)

[flakbait]

Fscott, you read that 13:1 ratio like this:

13 feet droped per foot of forward movement. If the test is in metric, then it comes out as 13 meters droped for every meter of forward movement.

Buddy of mine is a glider nut and told me how to read ratios like that.




------------------
Flakbait
Delta 6's Flight School
"My art is the wings of an aircraft through the skies, my music the deep hum of a prop as it slices the air, my thrill the thunder of guns tearing asunder an enemy plane."
Flakbait
19 September 2000

[Pyro]

The ratio is forward/descending.  If it were the other way, it'd basically be a freefall.  

You also want to make sure you manually bring your RPM down to the lowest setting when doing this and results will vary with speed.



------------------
Doug "Pyro" Balmos
HiTech Creations

[F4UDOA]

FlakBait,

I'm pretty sure it is the other way around.
13Ft forward and 1 foot down.

Just think about the alternative. 13Ft or meters down for each  Ft/meter down would be the equivilent of a 90degree virtical dive.
Not a glide at all really.

Fscott,

You are accurate, that is the glide of an F4U. I don't know if you remember that the glide ratio was the one single piece of information more than any other that led to the change in FM's from 1.03 to 1.04 with much better E-retaining qualities. I was at the center of many of those discussions. If you want to look up the threads specific to that discussion look for two threads in particuler. "Somethings not right in Mudsville" starting by Hitech himself and
"Somethings not right in Mudsville part 2" started by me  as well as another thread by me   called Glide ratio's.

Anyway I think allot of the answers to your questions will be found there. If you have any other questions that relate to the Aerodynamics of these birds you will want to talk to Wells. He was the brains behind the bull.

Later
F4UDOA

[flakbait]

Thanks for the clarification. Seems I'm always swapping those two values around.



------------------
Flakbait
Delta 6's Flight School
"My art is the wings of an aircraft through the skies, my music the deep hum of a prop as it slices the air, my thrill the thunder of guns tearing asunder an enemy plane."
Flakbait
19 September 2000

[F4UDOA]

fscott,

Here are the links to the threads I mentioned earlier.

Glide ratio's  me
 http://bbs.hitechcreations.com/smf/Smileys/default/Forum9/HTML/000632.html

Somethings not right in Mudsville By HT
 http://bbs.hitechcreations.com/smf/Smileys/default/Forum1/HTML/003708.html

Somethings not right in Mudsville part 2 me
 http://bbs.hitechcreations.com/smf/Smileys/default/Forum1/HTML/004149.html

Should answer some of your questions.

Later
F4UDOA