NEITHER.

It's an emitter. Hard to stay invisible when you're broadcasting yourself on
some other frequency.

USAF Comm/Nav

"Hobo" > wrote in message
...
>
> Is it because a radar wouldn't fit into the funny shape of the aircraft
> or because LPI radar of that era wasn't good enough?

The LPI radar on the B-2 is a flat planar array, which is easier to
'stealth' - you can just set it into a flat RAM panel, because it's
electronically steered. When the F-117 was being developed, the only type of
radar available was the conventional mechanically scanned antenna.

Matt

"killfile" > wrote in message
...
> "Hobo" > wrote in message
> ...
> >
> > Is it because a radar wouldn't fit into the funny shape of the aircraft
> > or because LPI radar of that era wasn't good enough?
>
> The LPI radar on the B-2 is a flat planar array, which is easier to
> 'stealth' - you can just set it into a flat RAM panel, because it's
> electronically steered. When the F-117 was being developed, the only type
of
> radar available was the conventional mechanically scanned antenna.

Maybe we could have purchased a Flashdance radar from the Russkies;)

Hobo wrote:
> Is it because a radar wouldn't fit into the funny shape of the
> aircraft or because LPI radar of that era wasn't good enough?

LPI was pretty much non-existent when the F-117 was designed anyway.
Remember that this was essentially a late 1970s design, with the first
planes delivered in the very early 1980s.

They made a decision not to use any active sensors in the design, and the
space where a radar might go was taken up by the two FLIR balls instead.

OTOH, some of the notional Navy F-117 developments had radar, so it was not
physically impossible to install. However, the Navy F-117s were much later
ideas (early 1990s) and radar tech had advanced. In any case, they would
probably not have expected to stay stealthy with the radar active.

--
Tom Schoene Replace "invalid" with "net" to e-mail
"If brave men and women never died, there would be nothing
special about bravery." -- Andy Rooney (attributed)

"Thomas Schoene" > wrote in message >...
> Hobo wrote:
> > Is it because a radar wouldn't fit into the funny shape of the
> > aircraft or because LPI radar of that era wasn't good enough?

No, because the F-117 doesn't need it, broadcasting its location over
priority targets.
The engagement profile of the F-117 is simple:
The F-117 detects its targets with FLIR in the nose turret. Bombing
from a medium altitude the F-117s fire-control computer calculates the
proper release point for the weapons to reach the general target
vicinity. Weapons release will generally be at a range of 1 to 2 miles
out. Closer to the target control is switched to the DLIR turret
equipped witha laser designator. As the weapon approaches the target
the laser designator goes into action. Sensors in the nose of the
weapon now steer it toward the reflection where it detonates with
devastating accuracy. Pretty simple.
However, in the brief time the F-117 opens its bomb bay doors and
drops the weapons the plane is vunerable to radar, causing a instant
"bloomer" onscreen. It then ceases to be invisible. In ODS, Capt. Matt
Byrd flying "Habu 2" over Baghdad was detected and fired upon by an
SA-3 battery with two near misses.
No matter what the claim, the F-117 is NOT invisible. The EADS
anti-stealth missile exploits stealth vunerability. It has a highly
advanced multi-sensor seeker that features acoustic, electro-optical,
and plume detection. This makes sense as the F-117/B-2/F-22 all make
noise, can be visually seen, and emit exhaust.

Rob

The F-117 doesn't have radar?

Shabah

F-117A Webmaster wrote:
> The F-117 doesn't have radar?
>

You post under that handle and don't know something this basic about the
aircraft?!?

No, the F-117 does not have radar. It has a pair of FLIR turrets -- one
looking forward and one looking downward (whihc they actually call a
DLIR) -- as its target acquisition sensors.

--
Tom Schoene Replace "invalid" with "net" to e-mail
"If brave men and women never died, there would be nothing
special about bravery." -- Andy Rooney (attributed)

In article >,
Hobo > wrote:

> In article >,
> (Uhu219) wrote:
>
> > NEITHER.
> >
> > It's an emitter. Hard to stay invisible when you're broadcasting yourself
> > on
> > some other frequency.
> >
> > USAF Comm/Nav
>
> Do you know what LPI radar is?

Other than Low Probability of Interception?

"Hobo" > wrote in message
...
> In article >,
> "Thomas Schoene" > wrote:
>
> > LPI was pretty much non-existent when the F-117 was designed anyway.
> > Remember that this was essentially a late 1970s design, with the first
> > planes delivered in the very early 1980s.
>
> I think a couple of other posts have made the same comment. It is my
> understanding that the Tacit Blue program used LPI before the F-117 was
> built. Is this incorrect?

Not really: the F-117 first flew in June of '81 and Tacit Blue the following
February. Recall also that the F-117 was a developed/operational version
of the earlier Have Blue concept plane.