Forum: F-35 Lightning II

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Ack.. you beat me to it.

Also:
http://www.aviationweek.com/aw/generic/ ... %20Testing

I see it went up to 39,000 feet, funny because I remember some of the so called experts (one who unfortunatly posts on this site who's named after a well known soft drink) assuring us that no, the F-35 will struggle to get above 30.000 feet and will not perform at altitude.
The so called critics and wannabe sweetmans are looking more and more stupid by the day.

583kcas=1.02M, not 1.2 M.
they make a mistake.

qwe2008 wrote:

583kcas=1.02M, not 1.2 M.
they make a mistake.

At sea level, but not at 39000 ft Wink

.

Scorpion82 wrote:

qwe2008 wrote:

583kcas=1.02M, not 1.2 M.
they make a mistake.

At sea level, but not at 39000 ft Wink

.

you are wrong.

at sea level, 583 kcas is only 0.9M.

http://www.aerospaceweb.org/question/at ... 0112.shtml

according this site M 1 is 573 kts at 40k ft. The steps at these altitudes are very small. Though I have to agree tha M 1.2 looks a bit exaggerated if we take these data from the tables at face value. But there are ofcourse some other factors which may count in.

Mach 1.2 is confirmed.

B. Bolsøy
Oslo

I think those are three independent test points.

The aircraft achieved Mach 1.2.

The aircraft achieved 580 knots calibrated (probably down lower and don't confuse true airspeed with calibrated).

And it operated at 39,000 feet (also where the Mach 1.2 was probably accomplished).

580 knots calibrated airspeed at 39000 feet is Mach 1.7.

Mach 1.2 at 39000 feet is 396 KCAS.

At 39K, you can either be at Mach 1.2 or 580 KCAS, not both.

OL

BTW, Mach 1.2 equals 580 KCAS at 20,000 feet so this may have been referred to in combination, followed or preceded by the climb to 39,000 feet.

If the F-16 has to resort to afterburner to keep up with the F-35 in full military power, does this mean the latter does not require AB to go supersonic?

popcorn, then your question would need to be qualified: at what altitude and weight [in clean configuration] of the F-35 aircraft for those conditions to be met (F-35 variant going supersonic in straight and level flight with/without afterburner)? I have no idea myself.

Correct.

The F-35 does not need AB to go supersonic.

Will the F-35 'super-cruise'; NO, not by the USAF definition of 'super-cruise' which is = or < M1.5 without AB.

At least that's what is 'public' and has been stated since the JSF's inception.

JSF.Mil wrote:

Does the F-35 supercruise?
No, neither the F135 or F136 engines were designed to supercruise.

http://www.jsf.mil/contact/con_faqs.htm

Then again a 'clean' F-16 doesn't need AB to go supersonic either, but when chasing F-35s around for hours at a time I suppose they need the extra bags of fuel.

TEG

outlaw162 wrote:

580 knots calibrated airspeed at 39000 feet is Mach 1.7.

Mach 1.2 at 39000 feet is 396 KCAS.

Mach 1.2 equals 580 KCAS at 20,000 feet

you are wrong.

580 knots airspeed at 39000 feet is Mach 1.02.
Mach 1.2 at 39000 feet is 680 KCAS.
Mach 1.2 is much more than 580 KCAS at 20,000 feet

580 knots TRUE airspeed at 39,000 feet is Mach 1.02.

Mach 1.02 is 327 knots calibrated airspeed at 39 grand.

680 KCAS at 39,000 feet is Mach 2 (that's 1176 knots True airspeed).

Mach 1.2 is 580 knots KCAS at 20,000 feet.

Trust me, I'm a doctor.

OL

qwe2008 wrote:

you are wrong.

I guess that could be based on U.S. Standard Atmosphere of 1976 or not; but if you weren't above Edwards AFB on that particular day, at that particular altitude, with that particular air density, at that particular temperature, I suggest you be a little more forgiving with your math/finger pointing.

I'm sure the hundreds of engineers reading the telemetry from a $100M+ pre-production aircraft from a multi-billion $$ military fighter program new EXACTLY how fast that F-35 was going.

Then again, the media tend to screw up the reports/print more often than not.

TEG

Forum: F-35 Lightning II

Good News and Mach 1.2 at Edwards