f-18 roll test departure

www.seveng-f18.com:Upcoming F/A-18 PC based simulation

Category:

Autos & Vehicles

Tags:

• f-18
• hornet
• departure
• out
• of
• control
• seven-g

[699backstab]

The plane may have pulled 8 g for a moment but that moment passed quickly or it was a fault of the accelerometer in unusual attitudes. Every fighter has a cornering velocity so it can create max g and tightest turn. If he was at it it wasn't for long. G is made as a result of lift or rotational spin. That's it. Its a tumble and there is little G, certainly not 8 sustained. A stall is the equalizing of pressures as a result of turbulent airflow to be more specific that your last.

[watchnrate]

@699backstab

Or, tip #1: watch the damn video.

[watchnrate]

@699backstab

In other words, assuming the axis of rotation is somewhere near the engine, being the centre of gravity in most fighters (approx. 10.4m from the cockpit in the F/A-18), time taken for one rotation = sqrt[(4*pi^2*10.26)/81.423], i.e. 0.70 seconds for one rotation. Compare this to the video. Satisfied?

[watchnrate]

@699backstab

down, to a spin, if loss of lift is only on one wing. Again, in this spin, the pilot, or the G metre at least, may be subject to high rates of rotation, thereby subjecting said object to gee (or centripetal acceleration). If you need a calculation (in SI units, mind, I can't think in imperial), the time taken for a single rotation of the nose of an F/A-18C to generate 8.3*9.81 ms^-2 of acceleration (the very possible readout on the HUD) is equal to e root of [(4*pi*Radius^2)/Gee]

[watchnrate]

@699backstab

Oh yes, by the way, a stall isn't necessarily a low-G manoeuvre; it is only a function of angle of attack. If you say that stall is a low-G manoeuvre, then I suppose you've only ever known stalls on approach... in a Cessna 172... which can't pull significant G. The process of stalling is the loss of coefficient of lift on one or the other wing of an aircraft; this loss of lift may cause the aircraft's centre of lift to shift, destabilising it, inducing anything from a gradual float

[watchnrate]

@699backstab

pass. For another, to be pedantic again, stall =/= equal pressure. Stall is merely the presence of turbulent flow downstream of the leading edge of the wing, which reduces the lift coefficient of the wing at that aoa, but does not necessarily equalise pressure.

[watchnrate]

@699backstab

I point to the HUD readout.

I hope that you've noticed by now that the arguments you are advancing are only with respect to G in the vertical dimension. I understand perfectly what you mean, though I cannot possibly agree with your explanation of Gs. To be pedantic, you conflated Gs as a function of lift and centrifugal force (a fictitious force). Don't know what you did in between your two comments, but I'd expect someone who chooses to talk like that to know his stuff on first

[Scoggs117]

@699backstab Not sure what you two are arguing about, but he is right.  The A/C pulled 8.3G at some point during the departure. The 8.3 under the G meter on the left of the HUD indicates max G's pulled during flight. It only indicates after 5+G's have been pulled.

[699backstab]

@watchnrate If I need to explain that to you then you know little about lift. I wont waste my time. Its a given that if you are here posting you have something to offer and you have an education on the subject. If you want to know more go to google kid.

[Ziggyasd]

@699backstab I agree with you on something, the pilot didnt seem to be a pro AT ALL. But you are simply wrong about the Gs, if you watch the video again you can see that the Gs go up to 8.3, as marked clearly in the max G display. My guess is that it was due to a hard imput of the pilot on the comands. Its there for you to watch it and it happens aproximately at 0.49 of the video.

[699backstab]

@watchnrate The only other way G can be created when stalled is through centrifugal acceleration. To make your 8 G through rapid rotation would be insanely fast spin rate which it isn't. You don't really know aviation like I know aviation. A stall is a low G maneuver. Again, to make G you need speed and angle of attack. Angle of attack up to but not beyond the critical angle for that design. I am right admit it and I'll E-forgive you for insulting my greatness

[watchnrate]

@699backstab Explain to me how G must always be the direct result of lift. Besides, 0.48

[699backstab]

@watchnrate Explain to me how you can be in a stall and pulling ANY G? To even create G you need lift. Lift is said to be non existent in a stall. When you stall a wing you equalize the pressures above and below the wing surface. Lift and G force are reduced to very low levels. You claim 8 G is occurring. Please explain to me how this 8 G is possible while in a stall. Go.

[watchnrate]

@699backstab Any idea how insanely scary it is to be in a deep stall, 8Gs pulling on you at 800 agl? Nope, me neither. :)

[PM1815]

too low to play

[699backstab]

"OK set'n zero g..rollin.......woop woop woop woop wopp woop whoa Im a shitty pilot..wow I was trying to get the f 18 to upset and depart controlled flight because everyone knows it has this limitation and now Ill cry like a schoolboy about how surprised I am that it in fact departed controlled flight. And now ill mention that I was too low to get out which means clearly that I am poorly trained and simply too immature to be doing this work in aviation. My judgement is insufficient to be flying

[bigjohn577777]

@699backstab

You are an idiot, you can stick your professionalism up your ass. Anyway do you happen to be a fighter pilot or just talking out of your ass like everybody else on youtube? I am guessing you fly 172's.

[699backstab]

I know nothing? Look at this moron..he is all bent out of shape..and he was searching for this departure from controlled flight. He was expecting this. I know a great deal about flight. It is my livelihood. Shitty pilot, poorly trained. Convo over son.

[SideWinderVideos]

@699backstab

Boy oh boy, you know nothing.

[699backstab]

Wow this pilot is very unprofessional. I hear a lot of holy shits when there should have been calm and collected communication about the departure followed rapidly by verbalizing his recovery. Imagine how this kid freaks out when some launches a weapon at him. How did he get this job being such an unstable spaz?

[aaron8862006]

GREAT vid... thanks for sharing. What's the source?

[wolf1010]

Nice video :)

[Morpheus9331]

really nice one i love that 0G's Feeling