Forum: Technology

That_Engine_Guy wrote:

So if you change the aluminum alloy at the leading edges of the wings to 'something different' what are you going to do with the canopy and/or radome?

Aerodynamic heating to the canopy may not be good at MACH 2.5 for more than 5 minutes; IE it heats up enough after 3 or 4 minutes to become brittle and/or soft? What about the fiberglass radome? When will it shatter?

You can't just change one 'weak link' in a chain and expect the whole chain to be 10% stronger. If you change one weak link, the next weakest will break, change that one, and the third weakest will break...

See where I'm going? TEG

All you have to do is change the material on the canopy, Carbon fiber can hold it's properties up to 1500 degrees.

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mustang65 wrote:

All you have to do is change the material on the canopy

mustang65 wrote:

So all the Air Force would have to do is change the alloy, so that it can handle the stress of high speed and then the eagle can maintain top speed for five minutes.

Well as long as that's the only thing you need to do.... Rolling Eyes

Just strip all the aluminum skin from the leading edges/hot spots of the entire aircraft and replace it with titanium or stainless steel, replacing the underlying structure as well so it doesn't melt; completely redesign the canopy with additional bracing and make it of high-temp glass....

...so Mustang can say his 'clean', non-combat, one-of-a-kind, billion dollar, super-special Eagle can fly MACH 2.5 for 5 minutes... Doh

...5 minutes or until it runs out of fuel! Shocked

Well Mustang, "all you have to do is" call up AMARC and ask them if you can 'borrow' an F-15A from the bone-yard, I'm sure the USAF won't mind 'cause they're throwing away the old Eagles...
...or you can go to Russia and pay a few thousand $$ to fly MACH 2.5 in a Mig-25... LMAO

Seriously Mustang; how old are you?
TEG

Can anyone give me the difference between stubborn and steadfast?
TEG, you have the patience of a saint! Smile

Saint TEG? I like it!
fisk

I will give it up but that is all they would need to do for that to happen, it would not run out of fuel for five minutes at top speed though. Yes I know that it will never happen, but I have been obsessing to much and I am going to stop.

TEG

Mustang

You get the Eagle, I'll fix up the old -100s and we'll go fly MACH 2 until we're bingo fuel.

I'm sure Gums will be happy to give us check rides!

Somehow I remembered the song by Orson Welles;

I know what it is to be young
but you,you don't know what it is to be old

It is early in the morning here... Very very early.

mustang65 wrote:

I will give it up but that is all they would need to do for that to happen, it would not run out of fuel for five minutes at top speed though. Yes I know that it will never happen, but I have been obsessing to much and I am going to stop.

Almost forgot to point something out Young Mustang...

It would not 'run out of fuel for five minutes at top speed' in it's current configuration.

You're talking of adding a few thousand pounds of higher temperature (higher weight) materials over the entire leading edges of the aircraft, not just the skins but underlying structure as well. Including new (heavier) fasteners to attach everything at higher temps/stresses. (Imagine every rivet in the front 1/3 of every surface weighing twice as much.) Then canopy/windscreen that would weigh 2 or 3 times more than the current configuration.

All this weight would take more lots more fuel to get airborne, then even more fuel to reach altitude for you to do your MACH 2.5 run. You may actually have less time at MACH 2.5 than 5 minutes with all your 'simple' modifications.

All goes back to the; can't get something for nuthin' Doh

You get an A+ for enthusiasm though, and a B+ for creativity,but a C+ for persistence (you almost broke my FNG patience barrier)

TEG

That_Engine_Guy wrote:

mustang65 wrote:

I will give it up but that is all they would need to do for that to happen, it would not run out of fuel for five minutes at top speed though. Yes I know that it will never happen, but I have been obsessing to much and I am going to stop.

Almost forgot to point something out Young Mustang...

It would not 'run out of fuel for five minutes at top speed' in it's current configuration.

You're talking of adding a few thousand pounds of higher temperature (higher weight) materials over the entire leading edges of the aircraft, not just the skins but underlying structure as well. Including new (heavier) fasteners to attach everything at higher temps/stresses. (Imagine every rivet in the front 1/3 of every surface weighing twice as much.) Then canopy/windscreen that would weigh 2 or 3 times more than the current configuration.

All this weight would take more lots more fuel to get airborne, then even more fuel to reach altitude for you to do your MACH 2.5 run. You may actually have less time at MACH 2.5 than 5 minutes with all your 'simple' modifications.

All goes back to the; can't get something for nuthin' Doh

You get an A+ for enthusiasm though, and a B+ for creativity,but a C+ for persistence (you almost broke my FNG patience barrier)

TEG

I am confused so it maintain top speed for five minutes without any modifications? It seems to me all they need to do is equip some high temp glass and then it would work but you never know.

I am confused so it maintain top speed for five minutes without any modifications? It seems to me all they need to do is equip some high temp glass and then it would work but you never know.[/quote]

It 'could' if it weren't limited by the operating instructions.

But...

IF you were to modify the whole thing and make it heavier, the fuel consumption would go up over it's basic configuration.

What I'm saying; there should be enough fuel in an Eagle to do MACH 2.5 as it is built for 5 minutes, but limits imposed by the Air Force prohibit such flight due to some sort of safety concern. If you were to modify the aircraft to eliminate the safety concerns and made the aircraft heavier, the fuel load may not last as long as the original configuration.

More weight, needs more power, needs more fuel, which causes more weight, which requires more power, burning still more fuel.... (snowball effect)

Follow? TEG

Get yourself a Foxbat and call it a day.

mustang65 wrote:

I am confused so it maintain top speed for five minutes without any modifications? It seems to me all they need to do is equip some high temp glass and then it would work but you never know.

Did you just ignore everything TEG said. It's not a matter of just using a canopy with higher temp limits. There are a lot of other areas on the aircraft that aren't designed to withstand prolonged M2.5 flight. If you increase their specs, then your penalty is weight, which means you get less range due to increased fuel consumption. There isn't anyway to get the F-15 to fly at its top speed for prolonged periods. It's structures aren't designed for it, and it doesn't have enough fuel. The only production aircraft that can withstand those speeds(for prolonged periods) are the Mig25/31, and the SR71. That's it!

Five minutes isn't that long it can maintain top speed for five minutes. I am not talking about twenty minutes or ten just five that is definitely possible.

Possible, but prohibited. Big No No

TEG

Active Member Joined: Jan 30, 2010 - 08:43 PM Posts: 151

Does any F-15C/D is equipped with -229 engines?

No there are not any C models that I know of that have 229 engines, but with the composite material it would lighten the load of the Eagle and allow the Eagle to get to 1875mph safely and quickly for five minutes.

Forum: Technology

Impossible aircraft mods...and why