These days I read an article which told me information of Lavi can fixed Conformal Fuel Tank UNDER airframe side. I think again and again, in terms of
such small aircraft how can it carry CFT? There is no picture accompany with the narrate so I have no idea also hard to imagine. Who can help me?
Posting the article in question would likely provide a more contextually interpretable understanding of the original writer's intended meaning if not
your exact answer.
Assuming you are referring to the IAI Lavi lightweight fighter, with only 5-6,000lbs of internal fuel (almost 1,200lbs/15% less than even the F-16) I
have long wondered at the claims for upwards of 1,150km/625nm worth of interdiction radius with an X8 M117 (6,300lbs) bombload.
The obvious answer of course is that 'the Israeli's being Israeli's', lied through their teeth when they said that they were after an A-4 Skyhawk
class (replacement ground attack jet) airframe and the fudging the spec was only a part of the coverup to generate an export fighter to compete with
As the sleek lines, afterburning engine and period compareable AMX-1 Centauro all highlight as differences in wasted weight and performance for a mere
OTOH, if you look at the belly of the Lavi-
Unlike that of the F-16 which has a distinct separation between the engine nacelle and the side sponsons onto which the tails and wings are mounted,
the Lavi has a blended wing:body structur resulting from what is effectively a low-wing monoplane format 'over' a modified nose/inlet system (like a
Su-27). As you can see, despite having a short wheelbase, there is also considerable CG freedom inherent to the long centerline tank.
Looked at in front elevation and planview-
It also becomes obvious that the principle wing pylons are mounted well outboard (presumably to clear the canard arc) and the ground track is quite
From these, one can surmise two possible options.
The first is a cross between the Northrop scabbed ALQ-171 jammer system tested for the Swiss F-5E force in the early 1980's. By integrating cutouts
with the tight landing gear inner-door clearances, they managed to fit a fairly hefty sized pallet system to the bottom of a rather narrow
The other option that comes to mind is something along the lines of the F-4E 'Super Phantom 2000' conformal tank which again was more along the
lines of a bathtub enclosure that fitted over the belly. In this case, the Lavi would probably use twin installations under the wide wingroots and
possibly mount freefall stores to them (as indeed MacDac experimented with).
If you then put 600 gallon (IAI F-16 mod) tanks underwing and ARM or AAM outboard, along with using the cheek pylons for a targeting/nav pod, you
could probably get on the order of 18,300lbs of fuel split between 5,000lbs in the conformals, 5,500lbs internally and 7,800lbs in the wing bubbles.
Assuming the poor beast could get off the ground (probable topoff via IDFAF tankers), with that load, with the improved TSFC of the PW1120, it would
likely give a Lavi strike package the 600nm radius claimed.
15,500lbs empty + 26,300lbs consumeables and warload = 41,800lbs. With a 42,500lbs max gross, you wouldn't quite pull the wings off.
But your maneuver limits until you burned down or dropped some of that weight would be extreme, probably under 5.5G and 430 knots. Certainly unable
to 'self escort' through anything like a high threat area.