You got it, I just saw an article where an F-15 pilot was discussing the top speeds:
Cold War Eagle Driver: F-15 pilot reveals all
“Dirty, which is to say in normal training or combat configuration, I doubt anyone has gotten an Eagle much over Mach 1.8 in level flight.”
So all these posts MoronOnTheStreet has made lamenting the F-35 as being too slow to be effective, but it's top speed in a combat configuration of mach 1.6 is only barely slower than a combat configured F-15, and surely faster than combat loaded F-16 or F-18. MoronOnTheStreet thinks puddle deep about things, he sees the top speed of a stripped down air show fighter and figures that is a useful practical barometer.
To take that farther, mach 1.6 is the
minimum program requirement for F-35 speed, which means an F-35C can fly at mach 1.6. Given that a F-35A is more aerodynamically efficient and weights 5,500 pounds less than an F-35C who really thinks an F-35A can only fly mach 1.6?
It's troubling how we all use "mach" as a measure of speed, even though it is, it is every misleading. At sea level Mach 1.8 is 1360 mph, at 30,000 feet is only 1220. A big difference. Of course all speeds I used are approximate.
To add, it's a real bear to even run Mach at near sea level. The air is thick, the drag is high and the leading edges heat up quick. Let me paint a Fictitious Scenario that never happened (wink, wink)
You need to get close up pictures of a military installation on the Kamchatka Peninsula but your sat is out of place. The SR-71 is not available. What do you do. You fly in a RC-135 Camera version with the new engines TDY into Elmendorf with replacement engines. You speed is slightly less than 600 mph advertised. But it can be done as sealevel. But that's the advertised top speed. So you come in low and fast. You start out low and slow, conserving fuel. You are trying to be as quiet as possible at this point.
Meanwhile, you have already launched an EC-130 that is on station just outside of international waters. They are tracking it. It appears to be flying from Fairbanks to Japan much like a Cargo Plane. No real threat.
As you approach with your RC, you turn on the speed. you hit it up to right around 500 mph and will be over your target in a matter of minutes, you slow down, hit the cameras, turn the bird back over the water and hit the water injection. For the next 15 minutes, you blow black smoke out your tail pipes and keep it below 200 feet off the caps.
The enemy picked you up right after you crossed the 12 mile line coming in. They launched their alert birds. Mig-31s. These things are going to be hitting Mach 2 in a matter of a few minutes. They are going to be passing 20K feet about the time you are making your turn back back towards the water after bagging the pics. The EC-130 goes to work. The enemy now has trouble with communications and radar. So do you but who really cares at this point. The EC can't stay on station but only a couple of minutes. Your RC is now hitting his top speed of 580 mph. The Mig can't really use his radar missiles. You drop your RC down to 50 feet above the caps which disables any long ranged heat seekers. Now, the Mig has to get up close, low and personal. The RC is burning gas fast but he is loaded with it so it's not a concern since he's also a full blown tanker. The Mig now has drop down low and he runs into a real problem. He has to slow down considerably. He is running into a heat problem and he is cobbling fuel like a bandit. The Tanker goes well past his 580mph top speed and enters into transonic at Mach .95. He is buffeting and shaking all over the place. This is an area he was never designed to fly at. In fact, it's not an area ANY aircraft is designed to fly at. The Mig has to overtake him and has to expend a lot of gas and keep at full AB to do it at sea level. He has about 15 minutes of total flight time to do it from the time he launched. That means he has only about 2 minutes of real pursuit time. He is pursuing at Mach 1.2. He fires his heat seakers but they can't lock on. He gets one short burst from his guns but he can't do enough damage to bring the tanker down. The Mig's hail mary fails. The RC makes it out barely. The EC has already left. And the Growlers are waiting to make sure nothing else can get close to the RC later on.
The RC slows down. He's now down to 3 engines and only able to make about 350 mph. He lands back at Elmendorf. All 4 engines are smoked, the entire airframe has been shaken to pieces. There are bits and pieces that are just plain missing. After a full engine swap, the bird is scheduled for a full Depot overhaul. But the pictures are good. Mission accomplished.
Just remember, this never happened. The names of the Aircraft have been changed to protect the Guilty. But at sea level, even a Cargo Plane has a chance of outrunning a fighter. It just might get down to who has the most gas. And if you fighter is loaded to the gills and has trouble maintaining over Mach 1, he can't really fly at subsonic. He will have to go below it and the Tanker type will be on equal footing if he is willing to sacrifice and engine. But he has 4 and can afford it. Your fighter has 2 and can't afford it. Sea Level makes everything pretty much equal at this point.