Spitfire pass

[AtomicLabMonkey]

This is awesome... I'd react the same if a pilot damn near shaved off some of my hair with a pass like that.

http://www.alexisparkinn.com/photoga...ire%20pass.wmv

[MattR]

That's a classic...
Agreed, that would have scared the shit out of me too...

[ArthurS]

HAHAHAHAHHAHAHH

[tysonK]

that was great...


north by northwest eat your heart out!

[Dean]

Come on, it cleared him by at least 10 feet...

[qksubi]

Originally Posted by Dean

Come on, it cleared him by at least 10 feet...

Yeah that was a little over the top with acting like he touched him or somthing

[AtomicLabMonkey]

Originally Posted by qksubi

Yeah that was a little over the top with acting like he touched him or somthing

Umm, if a low-flying aircraft passed over your head within 10 feet at 200-300mph from behind you, you'd probably be a little shaken up too. The engine/wind noise from such a close pass would probably be enough to damn near blow out your eardrums...

[sperry]

Originally Posted by AtomicLabMonkey

Umm, if a low-flying aircraft passed over your head within 10 feet at 200-300mph from behind you, you'd probably be a little shaken up too. The engine/wind noise from such a close pass would probably be enough to damn near blow out your eardrums...

(Assuming this is the video I've seen before) I'm actually surprised he wasn't pushed over by the wash from that thing! If you look closely, I think you can make an argument that the plane is actually below eye level before it gets to them. :shock:

It's good to know hot-shot pilots are still hot-shots no matter what era of plane they're flying.

Stinger: Maverick, you just did and incredibly brave thing. What you should have done was land your plane! you don't own that plane, the tax payers do! Son, your ego is writing checks your body can't cash. You've been busted, you've lost your qualifications as section leader three times, put in hack twice by me, with a history of high speed passes over five air control towers, and one admiral's daughter!
Goose: Penny Benjamin?
[Maverick shrugs]
Stinger: And you asshole, you're lucky to be here!
Goose: Thank you, sir.

[ShawnS]

Originally Posted by sperry

Stinger: Maverick, you just did and incredibly brave thing. What you should have done was land your plane! you don't own that plane, the tax payers do! Son, your ego is writing checks your body can't cash. You've been busted, you've lost your qualifications as section leader three times, put in hack twice by me, with a history of high speed passes over five air control towers, and one admiral's daughter!
Goose: Penny Benjamin?
[Maverick shrugs]
Stinger: And you asshole, you're lucky to be here!
Goose: Thank you, sir.

Best movie ever.

[ScottyS]

Originally Posted by sperry

(Assuming this is the video I've seen before) I'm actually surprised he wasn't pushed over by the wash from that thing! If you look closely, I think you can make an argument that the plane is actually below eye level before it gets to them. :shock:

I'd agree with that. Actually, the prop looks like it's on course to give them a shave right 'til the last second. The shadow shows how close that darn pilot came to screwing himself in a priceless aircraft. :shock: :shock:

[qksubi]

What is with the fuck me fuck me

[Dean]

Originally Posted by sperry

(Assuming this is the video I've seen before) I'm actually surprised he wasn't pushed over by the wash from that thing! If you look closely, I think you can make an argument that the plane is actually below eye level before it gets to them. :shock:

It's good to know hot-shot pilots are still hot-shots no matter what era of plane they're flying.

Agreed, but lets analyze a bit more...

Lighting: The sun is almost straight up, and bit behind and to the left based on the shadows on the announcer, and plane, so the planes' s shdow is in front of the plane so we need to keep that in mind when judging distances.

Wignspan of a spitfire is 36' 10".

When the wingtip is visually level with the announcer's shoulder/neck intersection, the plane is about 1/4 of the wingspan high already or about 9' and climbing hard as we see mostly the bottom of the wing. I would also guess the plane is still 100' from the announcer at this point.

When the leading edge of the wing is at the top of his head, the plane is still probably 30-50' feet out, and about 1/2 a wingspan off the ground, or about 18' up.

On to speed and thrust... Stall speed on a spitfire is 70MPH full flaps, and 85 no flaps, so it is likely he is not going much over 100-120 MPH as he passes. This is not a jet, so the thrust wash should not be that bad, espcially since the plane is already at speed, not doing a brake stand at the end of the runway... The prop is turning it's way through the air like a screw producing lift, not pushing air behind it like a jet! The sounds makes him duck, not the thrust knocking him over.

And unless the camera has automatic sound attenuation, the sound levels are not bad when you compare them to the announcers voice...

My guess is that the plane clears the announcer by at least 15 feet if not 25+. You decide if that is close or not...

[Libila]

Lighting: The sun is almost straight up, and bit behind and to the left based on the shadows on the announcer, and plane, so the planes' s shdow is in front of the plane so we need to keep that in mind when judging distances.

Wignspan of a spitfire is 36' 10".

When the wingtip is visually level with the announcer's shoulder/neck intersection, the plane is about 1/4 of the wingspan high already or about 9' and climbing hard as we see mostly the bottom of the wing. I would also guess the plane is still 100' from the announcer at this point.

When the leading edge of the wing is at the top of his head, the plane is still probably 30-50' feet out, and about 1/2 a wingspan off the ground, or about 18' up.

On to speed and thrust... Stall speed on a spitfire is 70MPH full flaps, and 85 no flaps, so it is likely he is not going much over 100-120 MPH as he passes. This is not a jet, so the thrust wash should not be that bad, espcially since the plane is already at speed, not doing a brake stand at the end of the runway... The prop is turning it's way through the air like a screw producing lift, not pushing air behind it like a jet! The sounds makes him duck, not the thrust knocking him over.

And unless the camera has automatic sound attenuation, the sound levels are not bad when you compare them to the announcers voice...

My guess is that the plane clears the announcer by at least 15 feet if not 25+. You decide if that is close or not...

Wow, I'm impressed.

That video was funny none the less.

[Nick Koan]

Dean, you have thought about this waaay to much

[sperry]

Originally Posted by Dean

Agreed, but lets analyze a bit more...

...blah...blah...blah...

It wouldn't be the prop-wash that would knock him over... it's the wash from the AOA lift the plane is using to climb out. And I'm sure it's a pretty mean gust even at 25+ feet.

And the next time you want to analyze my hyperbule... well, at least be more funny.

[Dean]

Originally Posted by sperry

It wouldn't be the prop-wash that would knock him over... it's the wash from the AOA lift the plane is using to climb out. And I'm sure it's a pretty mean gust even at 25+ feet.

And the next time you want to analyze my hyperbule... well, at least be more funny.

Maybe Snow Donkeys have gotten to you and you meant HyperMule? And no, since when was there a requirement to be funny on this board... You want to be funny, go post on CornerCarvers...

Planes are pretty aerodynamic. Wash = turbulance = drag... I'm sure he felt something, but it is pretty clear he ducks, he doesn't get blown over... And the camera doesn't shake much if at all.

Don't make me use physics on you...

Wanna talk about brake theory?

[AtomicLabMonkey]

Originally Posted by Dean

This is not a jet, so the thrust wash should not be that bad, espcially since the plane is already at speed, not doing a brake stand at the end of the runway... The prop is turning it's way through the air like a screw producing lift, not pushing air behind it like a jet!

Propellers produce thrust to push an airplane forward, same basic mechanics as a turbine. http://www.grc.nasa.gov/WWW/K-12/airplane/propth.html

[Dean]

[quote="AtomicLabMonkey"]

Originally Posted by Dean

This is not a jet, so the thrust wash should not be that bad, espcially since the plane is already at speed, not doing a brake stand at the end of the runway... The prop is turning it's way through the air like a screw producing lift, not pushing air behind it like a jet!

Screw may have been a bad choice of words, but it provides a good visual analogy.

While propellers and turbines are similar, Either generation of force is reffered to scientifically as thrust, but the general population equates thrust more with a leaf blower than a wing passing through the air. A turbine functions more like a leaf blower than a wing, while a propeller acts more like a wing than a leaf blower. (From your refference: "The propeller acts like a rotating wing.")

I guess it's a question of which pressure area is doing more work. As I understand, on a propeller, it is the low pressure in front of the blade that pulls the plane through the air as much if not more so than the high pressure behind the airfoil pushing it through the air. On a turbine, the high presure area at the rear of the turbine contributes a much greater force than the low pressure contribution at the front.

I guess the bottom line in this discussion is which generates a more focused column of air that might have "impacted" the guy standing there, and all I was trying to say was that props, especially ones that are already in forward motion, don't generate the same column of focused pressure that a turbine does. Would you buy that?

[MattR]

This is by far the worst thread I have ever read anywhere on the interweb..

Everyone loses.

[Dean]

Originally Posted by MattR

This is by far the worst thread I have ever read anywhere on the interweb..

Everyone loses.

You are going to be begging for drivel like this when you are stuck in New Zealand with all those sheep.... Or Maybe not... Baaaah...

[sperry]

Originally Posted by Dean

Planes are pretty aerodynamic. Wash = turbulance = drag... I'm sure he felt something, but it is pretty clear he ducks, he doesn't get blown over... And the camera doesn't shake much if at all.

Don't make me use physics on you...

I was exagerating about the guy getting knocked over... even misspelling "hyperbole" doesn't change that.... but the down wash is backed by physics, I'm not making it up... so feel free to bring it. The high angle of attack, which the Spit is at because it's rotated to climb out, will generate additional wash... like this:



Play with the Java App here, it's all animated and shit: http://www.grc.nasa.gov/WWW/K-12/airplane/incline.html

This wash has actually been expoited by the Russians in their ground effect transports:



http://www.gizmohighway.com/transport/ekranoplan.htm

The down wash compresses the air below the wing, increasing it's efficiency, as long as the plane stays a few meters off the ground.

[MattR]

That could be the best MS paint work ever....

[Dean]

Originally Posted by sperry

I was exagerating about the guy getting knocked over... even misspelling "hyperbole" doesn't change that.... but the down wash is backed by physics, I'm not making it up... so feel free to bring it. The high angle of attack, which the Spit is at because it's rotated to climb out, will generate additional wash... like this:...

The down wash compresses the air below the wing, increasing it's efficiency, as long as the plane stays a few meters off the ground.

I've seen this and other "ground effect" planes... Birds use it a lot as well. I'm not saying it doesn't exist, it just isin't a big 50+MPH blast is all.

This is the same pressure wave that makes it hard to land planes, and why they basically have to stall the wings to make them drop those last couple feet. You wouldn't have to flare if the damn plane would just continue decending, well, sort of... You have flown RC gliders. sometimes you alsmost have to nose them in to get the dang things to land. Most of mine have top spoilers that force the wing to stop working... Great for pinpoint landings in competition...

One of the coolest landings I ever did with my RC power planes was when I flared to early at about 10' off the ground, and the plane snap rolled and landed on it's wheels almost dead stopped. try that in a 737....

[sperry]

Originally Posted by Dean

You have flown RC gliders. sometimes you alsmost have to nose them in to get the dang things to land. Most of mine have top spoilers that force the wing to stop working... Great for pinpoint landings in competition...

That's funny, I've never had issues "landing" my glider. Course I used either the "lawn dart" landing approach, or the "tree capture" method.

[Dean]

Originally Posted by sperry

That's funny, I've never had issues "landing" my glider. Course I used either the "lawn dart" landing approach, or the "tree capture" method.

"lawn dart" = "nose them in"