I know a KEM like you propose is possible.
KEM's already exist in the world:
http://www.army-technology.com/projects/losat/
The basic idea is get a bigass engine (in the real world case a solid state rocket engine, in SW's use ion drives or whatever). If recoil is an issue (which I doubt) you can use KEM's, which are glorified hunks of metal (or whatever) being driven by a serious engine.
However, a concussion missile is probably the closest thing to a KEM available already in the SW galaxy, so perhaps you can use that as a benchmark to see what KEMs in SW are likely to be able to do and not do.
Closest thing is likely Adm. Daala' aborted suicide run with an ISD. She's planning to hit a *sheilded* planet and do significant damage by ramming it. Again if you can manage to move the DSI, you *must* have more efficient engines for KEMs. Further KEM's are only needed if we grant that recoil would be an issue for KEP's. With kinetic energy projectiles you only need a launcher capable of delivering the force and shunting any recoil to the greater bulk of the ship. This really shouldn't be that hard to engineer ... just use similar bracing to your engines.
Given their observed acceleration and the specs on mass ... they can most certainly mount KEM's that deliver more than the TESB asteroids.
The superfluous of the warhead depends on the terminal KE.
This is a space battle we are talking about, there are very few gimmics to slow them down - no friction, no wind resistance, virtually no exlectro-weak forces to speak of. F = ma (until we get into relativity) ... if you have an engine providing X amount of thrust you will get X/m acceleration which gives (X/m)*ToF for final v (assuming the engine has enough fuel to last this *very* short flight at full acceleration and negligable mass loss).
The only way that terminal KE goes down is an action from the target ... of course we have never seen such action from an ISD (never deflected a TESB asteroid). Further it takes *time* to deploy such measures. Given the energy availible and even modest efficiency you are going to have *very* little time to react.
Of course they are vaping the asteroids. No one said that letting an asteroid hit anywhere (even if it does no real damage) is a good idea. Besides, it does keep the crews sharp, doesn't it?
No. Asteroids are very easy to predict trajectory (at least with some good optics and computer), we have mapped countless ones from earth with 20th century technology. As opposed to a real target which, I dunno, *jukes*, changes speed, employs ECM, etc ... its shooting fish in a barrel. We have seen imperial gunners make some *damn* good shots ... you did get that sharp shooting pathetically predictable targets with *0* ECM.
Most of the asteroids they're vaping are too small to really conceal the MF. The MF is hiding in an asteroid, and they decide to scare them out of that one with TIE Bombers dropping what seems to be some kind of scare charges.
Do you know how stupid that sounds? You have ISD's which are firing with enough firepower to obliterate the falcon. *1* misfire could potentially kill the *MISSION OBJECTIVE*. I mean hell if Han does panic and run, he might fly right into an HTL blast which has a good chance of killing the mission objective.
It's like sending a SWAT team to pick up a felon hiding in a warehouse. You don't send live machine gun fire flying around the place while trying to smoke him out ... unless you want him dead. Battlefields are chaotic and the chances of killing the subject are too high. You do not use live fire in the vicinity of somebody who is hiding that you want alive without a damn good reason (like self-protection).
Darth Vader IS hot-tempered but he's not a total idiot. Anyone that could have assembled C3PO when he was eight has some intelligence going for him.
Really then why does he kill a perfectly compotent Captain who was simply outclassed by Han? Face it Vader is a *sociopath* with homocidal tendancies. Even guys who play it *by the book* and fail due to circumstances beyond their control get killed. Intelligent people are often the most vicious of killers. Intelligence has very little to do with morals and ethics.
You are not going to be complaining about chipped paint to somebody who has a habit of killing people for stupid reasons.
If the shields go down for any reason, an a asteroid finds the vulnerable bridge tower...you get my drift? Remember where the Captain will be in the search.
Since when did the Empire hire Starfleet egineers? Do their sheilds have a habit of going down unexpectedly (cough*FATAL_COMBAT_FLAW*cough)? Do high KE impacts make them fall down?
If any of this is true then it makes KEM's and KEP's even *more* viable.
Now yes I know about ion damage from Hoth, however that goes back to Vader being a sociopath and how badly he wants these guys found alive. If he's willing to send ships to their death against rocks that normally would *scratch their paint* he's friggen nuts and any ISD captain would not fire his HTL's potentially risking the death of the MF.
TLs used to have limited ammo. Now they are back to being full energy weapons, with things like light bullets being used to explain the visible part. There is an invisible component that now moves at lightspeed, making that part a full energy weapon.
Contradicts cannon. We have seen on *numerous* occassions how TL shots are fired and do NOT behave like pure energy. I.e. the DS, you fire 4 beams at different angles, end up with 1 beam heading out. Real energy does not do that. If TL's are pure energy then the definition of pure energy has changed dramatically.
In any event remember with the energy for 1 HTL shot you could accelerate 1000kg to .99c with good efficiency. The ToF difference is negligable between a RKEM and and pure energy weapons.
No data, but the ISD cannot evade the pattern. Besides, it could be firing neutronium pellets for all you know.
Lol and if its firing neutronium pellets the moon's orbit is going to be going to hell and back. You do understand that neutronium is so frikking dense that a small glob would out mass the earth, right? I mean its density is 10^47 kg/km^3.
The shield generators are apparently being burned out (OK, fine, slagged) by the backsurge. The rounds are being vaped, and apparently the KE is going into the shield as a power surge.
Umm I beleive ISD's have seperate particle/energy sheilds. So the failure is in the particle sheilds ... yet more evidence that the ship can't handle RKEMs.
Look it simply comes down to this either ISD's are vunerable to KE weapons with total energies a fraction of HTL yeilds, we have RANK IDIOTS running the TESB asteroid feild, or we reach ST drivel when the ship stops working as a plot device.
I'm not seeing any other options. If you want someone alive you don't shoot in their general vicinity without a *damn* good reason.