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Early Maneuverable Reentry Vehicle studies

sferrin

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DSMAC or GPS most likely.
Most DSMAC is IIR-based. How well would that work whilst going through the atmosphere at Mach 20? GPS is fine for fixed targets as long as it hasn't been jammed.
Pershing II used a radar DSMAC. Several Chinese ballistic missiles do the same. Indian as well.
 

Forest Green

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DSMAC or GPS most likely.
Most DSMAC is IIR-based. How well would that work whilst going through the atmosphere at Mach 20? GPS is fine for fixed targets as long as it hasn't been jammed.
Pershing II used a radar DSMAC. Several Chinese ballistic missiles do the same. Indian as well.
Oh right, I was counting RADAC and DSMAC as two separate things. Radar should work if not jammed.
 

GeorgeA

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The original concept of SWERVE used terminal radar guidance for one of its CONOPS, very long range AAM missions. As Spudman notes though, your acquisition sensor needs to be survivable to successfully hand off the target.
 
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marauder2048

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Are there any ideas on how they intended to guide these things? I remember it being said back around 1991 that CEP increased with manoeuvrable RVs unless they had terminal guidance. \
Curious where you heard this. AMaRV's accuracy was as good as contemporary ballistic RVs when evading and better if just course correcting.
All done inertially.
 
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Forest Green

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Curious where you heard this. AMaRV's accuracy was as good as contemporary ballistic RVs when evading and better if just course correcting.
All done inertially.
I read it in the IN COMBAT series back in 1991. Accuracy was lost because the inertial system is backed up by astro-referencing pre-release, but inside the atmosphere astro-referencing is lost and you're just left with inertial. Actually, no I didn't read it in IN COMBAT... I'm not sure??

 

sferrin

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Are there any ideas on how they intended to guide these things? I remember it being said back around 1991 that CEP increased with manoeuvrable RVs unless they had terminal guidance. \
Curious where you heard this. AMaRV's accuracy was as good as contemporary ballistic RVs when evading and better if just course correcting.
All done inertially.
Speaking of AMarV (From https://twitter.com/divert_thruster)

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ECgPFv2XkAEqwrc.jpg

ECgPILeXUAA_Smb.jpg

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"A new approach was needed. In Fiscal Year 1977, he Air Force began testing "strapdown" (solid-state) inertial guidance for its second-generation maneuvering reentry vehicles. Pictured: the RV in question, AMaRV (Advanced Maneuvering Reentry vehicle) "

ECMSHC7W4AIeT0I.jpgECMSHERXkAA5NdS.jpg
 

RanulfC

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Picture 5, (Arrgh, you're using the torque wrench wrong! And unsafe, and with an extension... for a dial torque wrench? Aggghhh) Got to be an engineer :)

Randy
 

sferrin

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Picture 5, (Arrgh, you're using the torque wrench wrong! And unsafe, and with an extension... for a dial torque wrench? Aggghhh) Got to be an engineer :)

Randy
Cheater bars are used enough with torque wrenches that there are simple equations for technicians to use. That said, when's the last time you saw a wooden ladder?

torque6.gif

torque wrench4.jpg
 

RanulfC

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Picture 5, (Arrgh, you're using the torque wrench wrong! And unsafe, and with an extension... for a dial torque wrench? Aggghhh) Got to be an engineer :)

Randy
Cheater bars are used enough with torque wrenches that there are simple equations for technicians to use. That said, when's the last time you saw a wooden ladder?
Not so much the 'use' of the cheater bar but the inability to actually and accuratly SEE the dial on the torque wrench all added together :)

As to wooden ladders, about two years ago, to address a "safety" write up we bought 4 wooden ladders to use in our Wash Bay as our QA was 'concerned' (hence the write up :) ) that metal and/or fiberglass ladders would become too slick during washing operations....

The electrical shop we swapped them out with, (for fiberglass ladders) is still using them today and they get a lot of "wow, wooden ladders" comments from inspectors :)

Randy
 

sferrin

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Picture 5, (Arrgh, you're using the torque wrench wrong! And unsafe, and with an extension... for a dial torque wrench? Aggghhh) Got to be an engineer :)

Randy
Cheater bars are used enough with torque wrenches that there are simple equations for technicians to use. That said, when's the last time you saw a wooden ladder?
Not so much the 'use' of the cheater bar but the inability to actually and accuratly SEE the dial on the torque wrench all added together :)
When you can't see the dial you go by the, "tighten 'til you hear the *crack* then back off a quarter turn" method. ;) :eek:
 

RanulfC

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Picture 5, (Arrgh, you're using the torque wrench wrong! And unsafe, and with an extension... for a dial torque wrench? Aggghhh) Got to be an engineer :)

Randy
Cheater bars are used enough with torque wrenches that there are simple equations for technicians to use. That said, when's the last time you saw a wooden ladder?
Not so much the 'use' of the cheater bar but the inability to actually and accuratly SEE the dial on the torque wrench all added together :)
When you can't see the dial you go by the, "tighten 'til you hear the *crack* then back off a quarter turn" method. ;) :eek:
And people like YOU sir are the reason people like ME, (and a majority of PMEL technicians I might add) have too much white hair and drinking problems :D

Randy
 

edwest

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Forest Green

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^Interestingly the statement there on accuracy matches the statement I made a while ago but someone corrected me on it and said it was as accurate even when performing evasive manoeuvres.
 
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