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What flavor of RIM-162 is this?

sferrin

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What flavor of RIM-162 is this? ???



http://www.armyrecognition.com/mspo_2012_show_daily_news_pictures_video_uk/raytheon_evolved_sea_sparrow_missile_essm_modernizes_polish_medium_range_air_defense_system.html


Hmmm. . .



Seems odd they'd make the front end full diameter given they've gone the opposite direction with SLAMRAAM-ER.
 

sferrin

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Any idea why, with SLAMRAAM-ER they kept the narrower AIM-120 seeker section but then went full-diameter with ESSM Block 2? Seems like it would cost them in performance with higher weight and more drag (vs ESSM Block 1). ???
 

TomS

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Possibly antenna diameter, which should translate into better resolution.
 

Moose

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The upgraded SLAMRAAM-ER still uses an off-the-shelf AMRAAM seeker (and guidance package). It gets mid-course guidance from a datalink, then switches on the seeker for terminal intercept. Just like the AMRAAM seeker was scaled up for SM-6, the Block II seeker is more than just an "off the shelf" slammer front end. The ESSM Block II seeker includes a dual-mode Active/Semi-Active X-Band capability with enhancements to engage the new generation of threat missiles we're seeing. But it's also heavier and more expensive.
 

Hobbes

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sferrin said:
Any idea why, with SLAMRAAM-ER they kept the narrower AIM-120 seeker section but then went full-diameter with ESSM Block 2? Seems like it would cost them in performance with higher weight and more drag (vs ESSM Block 1). ???
The back end of ESSM block 1 has the same diameter as that of block 2. So the frontal area remains the same, I suspect drag remains the same too. The only change is that some of the drag force is applied in a different place: on the nose cone for block 2, at the diameter step for block 1.
 

sferrin

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Hobbes said:
sferrin said:
Any idea why, with SLAMRAAM-ER they kept the narrower AIM-120 seeker section but then went full-diameter with ESSM Block 2? Seems like it would cost them in performance with higher weight and more drag (vs ESSM Block 1). ???
The back end of ESSM block 1 has the same diameter as that of block 2. So the frontal area remains the same, I suspect drag remains the same too. The only change is that some of the drag force is applied in a different place: on the nose cone for block 2, at the diameter step for block 1.
More weight means a higher AOA required for a given turn, which means more drag. Given the weight increase is up front will make it only more so. (On the other hand, more area up front works in the opposite direction. . . wonder what the net is. On the other other hand, previously the narrower forebody would act somewhat as an aerospike "breaking the trail" as it were. Now it gets hit in the face across the full diameter.)
 

fredymac

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Test firings of block 2 ESSM to verify VLS and canister launch safety. No targets involved.

https://www.youtube.com/watch?v=fuUbLU-DdgA
 

hark40

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A "silly" question. Any reason why the film was shot with the sun at such a location? On both of them there was footage shot into the sun. Was it just coincidence (unlikely with a test flight which would be timed with a certain amount of precision especially as the second shot the missile transited the sun), or was it purely to get a back lit subject (missile and smoke trail) for propulsive analysis of some sort? (Even though that was not the intent of these flights, but if something went wrong....)
 
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