StandOff & PGM Weapons

tyrin said:
aonestudio said:
www.af.mil

Joint Direct Attack Munition GBU- 31/32/38

The Joint Direct Attack Munition is a guidance tail kit that converts existing unguided free-fall bombs into accurate, adverse weather "smart" munitions.
www.af.mil
Once released from the aircraft, the JDAM autonomously navigates to the designated target coordinates. Target coordinates can be loaded into the aircraft before takeoff, manually altered by the aircrew before weapon release, or automatically entered through target designation with onboard aircraft sensors. In its most accurate mode, the JDAM system will provide a weapon circular error probable of 5 meters or less during free flight when GPS data is available. If GPS data is denied, the JDAM will achieve a 30-meter CEP or less for free flight times up to 100 seconds with a GPS quality handoff from the aircraft.
Click to expand...
Click to expand...
30 meters may not be accurate enough even with large bombs.
Click to expand...
Russian GPS jamming will only be effective in the last few km of flight. It will get decent GPS data at launch and will continue to receive data on the way to the target.

Basically its unlikely the CEP will veer that much off target, they might get a CEP of 15 metres...which for a 500/1000lb bomb is close enough....Russian GPS jammers are also exceptionally rare and high value. They're not going to be within 20km of the front (if that, their effect will drop away as distance and terrain gets in the way), and given what we know about Ukrainian use of JDAM/JDAM-ER and the way their aircraft will have to release it (i.e low and fast from a pop-up loft profile) they're not going to be targeting much beyond 10-15 km of the front line....
 
timmymagic said:
tyrin said:
aonestudio said:
www.af.mil

Joint Direct Attack Munition GBU- 31/32/38

The Joint Direct Attack Munition is a guidance tail kit that converts existing unguided free-fall bombs into accurate, adverse weather "smart" munitions.
www.af.mil
Once released from the aircraft, the JDAM autonomously navigates to the designated target coordinates. Target coordinates can be loaded into the aircraft before takeoff, manually altered by the aircrew before weapon release, or automatically entered through target designation with onboard aircraft sensors. In its most accurate mode, the JDAM system will provide a weapon circular error probable of 5 meters or less during free flight when GPS data is available. If GPS data is denied, the JDAM will achieve a 30-meter CEP or less for free flight times up to 100 seconds with a GPS quality handoff from the aircraft.
Click to expand...
Click to expand...
30 meters may not be accurate enough even with large bombs.
Click to expand...
Russian GPS jamming will only be effective in the last few km of flight. It will get decent GPS data at launch and will continue to receive data on the way to the target.

Basically its unlikely the CEP will veer that much off target, they might get a CEP of 15 metres...which for a 500/1000lb bomb is close enough....Russian GPS jammers are also exceptionally rare and high value. They're not going to be within 20km of the front (if that, their effect will drop away as distance and terrain gets in the way), and given what we know about Ukrainian use of JDAM/JDAM-ER and the way their aircraft will have to release it (i.e low and fast from a pop-up loft profile) they're not going to be targeting much beyond 10-15 km of the front line....
Click to expand...
I get the feeling that the speak of Russians effectively jamming the GPS guidance of GMLRS and JDAM going on in some (mostly American) mass media based on anonymous Ukrainian sources is a Ukrainian ploy intended to make Russians place and actively use their limited number of jammers next to strategic targets, thus both allowing the Ukrainian military intelligence to narrow down their search and making the jammers very vulnerable to attacks by AGM-88 HARM or other precision weapons.
 
bobbymike said:

Japan develops long-range target observation munition to accompany missiles | Shephard

To guide long-range weapons, Japan is developing a new missile with the express purpose of providing observation and targeting data.
www.shephardmedia.com
Click to expand...

Interesting direction. The USAF seems to going a different route where it wants to network a large number of effectors and use their inherent sensors, but having dedicated sensor type platforms would probably ease development and allow for much more capable seekers.
 
Josh_TN said:
Does NG advertise this as having any capability against sea skimming missiles? Also it isn't clear to me how the projectile maneuvers.
Click to expand...
“The aft manoeuvre system” whatever that entails
 
Sineva said:
I suppose thats about the only real advantage that the UMPK has over the JDAM type approach,it doesnt require the fitting of a new tail section with actuated controls,the UMPK simply straps on to the dumb bomb.
Click to expand...
You can describe UMPK as a "kamikaze glider" - a separate airframe with a suspended bomb. Currently it's ugly, but it seems to evolve into a scaled version of a civilian glider?

Given how bulky&inconvenient Soviet bomb series are - I'd argue that's quite an interesting idea, especially since it allows easily attaching literally anything. And that's a major advantage.
 
Last edited:
Sineva said:
Yes,I could imagine a smaller more compact version of this as an SDB equivalent carrying warheads like the tyulpan 240mm or pion 203mm artillery rounds.
Another possibility would be artillery rockets or RAP variants of large caliber artillery rounds to extend the range of the glide bomb.
Click to expand...
Or they can be used to deliver things like normal naval mines, or even supply crates. It's an interesting multitool.
 
Russian TG channel Fighterbomber talks about it:
It's full name UMPB D-30SN
UMPB is an acronym "УМПБ" - "Универсальный Межвидовой Планирующий Боеприпас", which would translate as Joint(?) Universal Gliding Munition . D-30SN indicates diameter, 30cm. By his words can be used on plane or MLRS, hence 30cm diameter. Russian airforce currently uses variant w/o jet engine, but likely to install it later.
https://imgur.com/a/boLKS1L
View: https://imgur.com/a/boLKS1L

t.me

Fighterbomber

Хохлы оценили нашу новинку на поле боя. В этот раз ей стала вундервафля под названием УМПБ Д-30СН что расшифровывается как Универсальный Межвидовой Планирующий Боеприпас (в некоторых источниках Бомба) диаметром 30 см. По сути это планирующая бомба, где вся хурма, а это блоки управления и...
t.me t.me

Essentially, it's a Russian SDB, albeit heavier and w/ jet engine.
 
Last edited:
Anduriel said:
Russian TG channel Fighterbomber talks about it:
It's full name UMPB D-30SN
UMPB is an acronym "УМПБ" - "Универсальный Межвидовой Планирующий Боеприпас", which would translate as Joint(?) Universal Gliding Munition . D-30SN indicates diameter, 30cm. By his words can be used on plane or MLRS, hence 30cm diameter. Russian airforce currently uses variant w/o jet engine, but likely to install it later.
t.me

Fighterbomber

Хохлы оценили нашу новинку на поле боя. В этот раз ей стала вундервафля под названием УМПБ Д-30СН что расшифровывается как Универсальный Межвидовой Планирующий Боеприпас (в некоторых источниках Бомба) диаметром 30 см. По сути это планирующая бомба, где вся хурма, а это блоки управления и...
t.me t.me

Essentially, it's a Russian SDB, albeit heavier and w/ jet engine.
Click to expand...
So russian SPEAR?
 
It seems to be full bay-sized, i.e. close to 4m long.
Slightly slimmer than Grom(300 v 310) to fit into Tornado tubes; won't be surprised if it is a redesigned Kh-38/Grom.
 
Ainen said:
Given how bulky&inconvenient Soviet bomb series are - I'd argue that's quite an interesting idea, especially since it allows easily attaching literally anything. And that's a major advantage.
Click to expand...

They aren't bulky though, they're far more compact than the US MK8* series because they make no allowance for low drag during external carriage. Hence why the bomb in Sineva's post has actually been fitted with a sheet metal nose fairing as part of the kit.

Rather interesting to observe how quickly operational experience is compelling Russia to introduce such kits as a crash programme, after basically turning its nose up at the notion of Western-style gliding PGMs for ages.
 
Trident said:
They aren't bulky though, they're far more compact than the US MK8* series because they make no allowance for low drag during external carriage. Hence why the bomb in Sineva's post has actually been fitted with a sheet metal nose fairing as part of the kit.

Rather interesting to observe how quickly operational experience is compelling Russia to introduce such kits as a crash programme, after basically turning its nose up at the notion of Western-style gliding PGMs for ages.
Click to expand...
Interesting just how simple they are from layout to materials used. One size fits all....

Enjoy the Day! Mark
 
Mark Nankivil said:
Interesting just how simple they are from layout to materials used. One size fits all....

Enjoy the Day! Mark
Click to expand...
It's not like the JDAM is particularly more complicated in assembly. Just that Ed Heineman's Mk80 series low drag bombs were rather brilliantly designed to be easily changed around in terms of fuzing and tail surfaces. Everyone else looked at that and made their guidance packs screw into the same fuze fittings as the nose and tail surfaces.
 
Emergency jettison doesn´t arm the bomb. Given the soft ground nature of the impact location (see photo above) and the crater shape that suggest a vertical trajectory at impact, we can guess this bomb was released during a toss bombing maneuver. Those are highly inaccurate with unguided ordonnance and only depends on the pilot professionalism.

It is of no surprise that some bombs end-up on Russian territory like this.
 

Similar threads

Please donate to support the forum.

Back
Top Bottom