Lift vs. Inverted flight

[cougar14]

Probably a dumb question, but for you airplane experts, I understand the principle of lift, more distance over the top of the wing, reduced pressure vs. the bottom of the wing, hence lift. Watching some cool RC videos on Youtube, occurred to me when these jets fly inverted, the wing ratio is reversed, seemingly causing reduced pressure on the bottom of the wing. Why don't these planes dive immediately into the ground?

 

[venomballistics]

Probably a dumb question, but for you airplane experts, I understand the principle of lift, more distance over the top of the wing, reduced pressure vs. the bottom of the wing, hence lift. Watching some cool RC videos on Youtube, occurred to me when these jets fly inverted, the wing ratio is reversed, seemingly causing reduced pressure on the bottom of the wing. Why don't these planes dive immediately into the ground?

"AOA" or rather, angle of attack.
While a cambered airfoil will be sub optimal for the task, it will produce lift with enough negative relative angle.
From the drivers seat, you're just shoving a lot of stick into it while getting a head rush.

Next lesson .... knife edge flight
In this arrangement, you are entirely reliant on speed and thrust as the wing is at 90 degrees relative to the ground.
Here you essentially "floor it", stand on the rudder pedal and hold in just enough aileron to hold the 90 degree bank.

Fun with RC twins .... With todays brushless electric systems, it is easy to set up counter rotating propellers. this was not possible without a machine shop to fabricate a crankshaft in the days of glo power. Now we swap two wires around and get a reverse pitch prop.
these are bliss to fly, and my preferred arrangement for FPV.
It has it's own party tricks when married to our more advanced radios.
We can mix the throttles of each motor to our rudder so as to augment yaw control with active thrust.
by reducing throttle to about 30%, pulling full back on the stick to induce a stall, full rudder input will then produce a dramatic, violent spin that's fun for all ages

 

[Tom S.]

Your question reminded me of a really old computer video flight simulator game a friend and I used to play. One day, while flying an attack bomber (I don't remember which one, but I think it was F4), I over flew the target and pulled back on the "stick" to see if I could do a loop to come back over the target. While I was inverted, the target came back up on my screen, so I hit the bomb release and to our amazement, I hit the target. We both joked about how the bomb must have just rolled off my wing and fell straight down.

 

[John_M52]

Those aren't wings, they're control surfaces....

 

[venomballistics]

Your question reminded me of a really old computer video flight simulator game a friend and I used to play. One day, while flying an attack bomber (I don't remember which one, but I think it was F4), I over flew the target and pulled back on the "stick" to see if I could do a loop to come back over the target. While I was inverted, the target came back up on my screen, so I hit the bomb release and to our amazement, I hit the target. We both joked about how the bomb must have just rolled off my wing and fell straight down.

this is actually how to drop a nuke.
pull into a loop over your target, lay the egg as you pass vertical. Continue the loop until inverted and roll to normal attitude.
while you're making your crew airsick, the nuke is traveling upwards, giving you extra time to get out of dodge

 

[Krogen]

There's more to it than just the Bernoulli Effect. It's been a while, but I recall there are four effects contributing to lift. The simplest is that of a flat surface angled relative to forward movement. Think back to being a kid and sticking your hand out of the car window. Your hand isn't much of an airfoil, but angle it upward and you experience an upward force. Beyond this, other fascinating things apart from the Bernoulli effect come into play.

Here's a great (long) video that covers all the good stuff.

 

[Swiftflyer]

It's magic!

 

[SMSgt]

There's more to it than just the Bernoulli Effect. It's been a while, but I recall there are four effects contributing to lift. The simplest is that of a flat surface angled relative to forward movement. Think back to being a kid and sticking your hand out of the car window. Your hand isn't much of an airfoil, but angle it upward and you experience an upward force. Beyond this, other fascinating things apart from the Bernoulli effect come into play.

Here's a great (long) video that covers all the good stuff.

Winner, winner . . .

 

[LVSteve]

My favorite aerodynamic joke involved the wing fences fitted to the MiG-15, -17, and especially the huge ones on the MiG-19. The Russians fitted them to prevent the Bernoullis defecting to the wing tips.