best angle of climb speed

[superdunkaroos]

hey guys i'm close to getting my commercial license and some pilot other day mentioned that in most planes the best angle of climb(Vx) is very close to the best glide speed(for range)

 

why is that?

 

i have looked throught my books and can't find the reason, im guessing the answer would lie somewhere in the power curves graph

 

any idea?

[mikoyan]

the answer is on wiki

This occurs at the speed for which the difference between thrust and drag is the greatest (maximum excess thrust). In a jet airplane, this is approximately minimum drag speed, or the bottom of the drag vs. speed curve. Climb angle is proportional to excess thrust

 

for example for the f-15 the best climb speed is around 800km/h, but for that you have to adjust your rate of climb; at least that is how they achieve the altitude record on the f-15 here is the video of the maneuver :

 

[Blaze]

at least that is how they achieve the altitude record on the f-15 here is the video of the maneuver...

Not to mention the Streak Eagle was absolutely stripped down to the bare essentials. Everything that could be done without, was. ;)

[RIPTIDE]

hey guys i'm close to getting my commercial license and some pilot other day mentioned that in most planes the best angle of climb(Vx) is very close to the best glide speed(for range)

 

why is that?

 

i have looked throught my books and can't find the reason, im guessing the answer would lie somewhere in the power curves graph

 

any idea?

So at maximum thrust in a Supersonic capable jet the best climb speed is Mach 0.9. Adjust your pitch accordingly. ;)

[superdunkaroos]

by best glide speed(range) i meant best glide with no engine power, the speed used for forced approaches

 

in this case though we should not be looking at the engine power curve

[BlueRidgeDx]

I'd explain it in my own words, but I'm not terribly eloquent or succinct. So here's a link to a nice article that should shed some light on the similarities and relationship between Vx and a best L/D descent:

 

http://www.erau.edu/er/newsmedia/articles/wp6.html

[superdunkaroos]

I'd explain it in my own words, but I'm not terribly eloquent or succinct. So here's a link to a nice article that should shed some light on the similarities and relationship between Vx and a best L/D descent:

 

http://www.erau.edu/er/newsmedia/articles/wp6.html

 

thanks

[a1994114a]

the answer is on wiki

 

for example for the f-15 the best climb speed is around 800km/h, but for that you have to adjust your rate of climb; at least that is how they achieve the altitude record on the f-15 here is the video of the maneuver :

 

 

Hi your answer looks very directive. Do you know the speed for best angle of climb(Vx) and the speed of best climb rate(Vy) for F86 and Mig15?

Edited December 18, 2015 by a1994114a