Why there is no fuel tank in Su-24’s wing? forgot?

I think in relative terms (cost per unit in relation to domestic gross product), the F-111 was cheaper, not because it was so economical but because the USA was so much more wealthy. It was by the way a huge technology program and introduced turbo-fan engines and swing wings.

Arh yes, F-111 is cheaper, compare with the speciality of US is to produce some aircraft like B-2 which only US wealthy enough to buy.:D
The cheaper price of F-111 was mentioned here not because it would spend less money on any aspect, but we took away the too large advantage somebody wrongly conceived from it:cool:

Aircraft are best compared by operating empty weight or by maximum take-off weight. In these terms the Suchoi 24 fails miserably against the older F-111, in terms of
– range
– radius
– war load.
Any claims about smaller fuel volume are academic. One rather has to ask why the similarly heavy (in terms of OEW) has substantially less fuel volume.
……

You lost “B” in F-111. That has to be FB-111.

Neither range or radius Su-24 gained with 2x3000liter external fuel tanks are almost equal to F-111 without EFT, meanwhile, Su-24 still can load 5 missiles (3 under fuselage, 2 under wing each), how many missile F-111 can load at this time?

Tactical and technical data:
Crew. — 2
The number of engines – 2
Type engines – 2 hAL-21
Maximum takeoff weight, kg – 39700 Max weight 39700kg
Maximum speed, km / h – 1320 (max speed 1320km h)
Service ceiling, m – 11500
Range, km – 2500
The maximum bomb load, kg – 7500
Dimensions: length – 24.5 m, height – 6.2 m, the magnitude of the wing-17.7 m.

Maximum speed km / h – 2320 Max speed 2320 km / h
Maximum speed from land km / h – 1400 Max speed a sea level 1400km / h
Service ceiling, m – 17500
The maximum flight range, km – 1300
Flight range Peregonochnaya km – 4270
Run, m – 900
Mileage, m – 850

translated from what MiG took from Russain web

The Wiki has already given the most reasonable answer. The VG inlet version of Su-24 Fencer A has top speed above 2 M but the fix inlet version of Su-24 get the lower top speed down to 1.6M. Such decrease also appeared on some other aircraft. The 1.3M is an unreliabe data for depreciative purpose.

He refers to the fact that using my very primitive assessment the Suchoi achieve 2136/2839 = 75% of the F-111’s range.

Have fun with relative numbers.
The statements
The Suchoi 24 achieves 25% less range than the F-111.
or
The F-111 achieves 33% more range than the Suchoi 24.
are equal.
People not used to math easily get tricked by relative numbers with unknown basis. Very popular with media and politicians, as you can basically let look any number very small or very huge, depending on the point you want to make.

As I said, my calculation does not have any direct connection to reality, it only displays the effect of SFC and slightly different fuel load on range for similar weights and L/Ds.
The SFCs I gave, however, resemble the reality pretty good.

SFC of AL-21 as a turbojet over 1.1 won’t surprise anybody, compare with TF30 originally was a turbofan.

My results basically support each statement he did. I didn’t plug in realistic weight data and used the fuel capacities you used. Including the effect of drop tanks would make the case even less desirable for the Suchoi 24.

Making a real missions assessment something that clearly exceeds the limit of what you do for an internet forum where many of the people not get the concept of SFC or L/D.

The SFC has already been considered in my calculation, but the L/D ratio was presumed as similar.

For our “translation experts”, which never got the idea, that some mistakes can happen even in Russian books and websites, when ignoring some important details.
Ever heard of US gallon and IMP, when it comes to gallons?!
One is ~3,79 l , when the other is ~4,55 l.
Kg can not be mistaken.

Sukhoi gives an official 11100 kg of internal fuel for the Su-24MK.
A typical specific weight of fuel is ~0,78 kg per litre, when it can between 0,75 till 0,8.
11100*0,78 = 14230 litre
11100*0,77 = 14416 litre
11100*0,76 = 14605 litre

Our “translation expert” Gordon gives 3188 gallon.
The US value of that is 12083 litre or 9424 kg.
The British value of that is 14505 litre or 11168 kg at 0,77 specific by rounded value of IMP.
Just for the benefit of the others.

Dear Sens:

The fuel capacity I used previously was 11883 liter (excharge to 9764kg)~almost .82kg/L

Now the key is a comparison of the size of AL-21 engine, if you see what I mean.:)

Sens won’t like the result you given, absolutely

:D:p:diablo: