Post your designs here!

What happened is the Devastators expended all their deltaV accelerating, and the ship just sat there lasing away.
Then when they get close, it starts accelerating to dodge, and the missiles discover they're no longer going to hit and don't have the deltaV to correct, and so are disabled.

Playing as the lasing ship against AI missiles, if you wait until the relative velocity stops increasing, then start maneuvering, even for a couple of seconds, you eliminate all the missiles.

So...I seem to have a problem using MPD thruster.

I tried to make a dual thrusters design warship that is as cheap as my full NTR warship so I could have the high delta V transit from the MPD thruster and the combat manuerve with NTR truster.

Unfortunately, instead of getting what I expected as 6 extra kilonmeter of delta-V, I got...3 meter of delta-V.

I checked to see if it's power problem, so I turned off all weapons and unnecessary system, but it still remains unchanged.

I have no idea how to solve this, does anyone know how?

I've done some experiments with RCS thrusting and the AI seems to go bug-nuts trying to use it So I gave up on it.

Deactivate your NTR, and you should see huge DeltaV (but you don't get much thrust, obviously). If you can get away with low thrust maneuvering, using MPDs to maximize the deltaV out of your tank works. Then when it's time for combat, switch engines and be ready to burn through what little you have left.

I tried deactivating everything that isn't the MPD, reactor and crew, still didn't work for some reasons.

That's strange, when deactivating Decane resistojets, I got a pretty nice dV from my (non-gimbals) Xenon resistojets. Note that I am using saucers with a cluster of large surface MPDs on one side, partially due to Broadsider being bugged to me and only showing acceleration from one MPD last time I tried.

My previous design accidentally used the stock violet laser. For the new one, I finally got full Saucer as I didn't want to bother with half-armour. (Armour itself is still a WIP - it can take a few punches but not that much. It will destroy any stock fleet way before return fire range, though).
It is using a cluster of 5 custom max-size Xenon thrusters. Note that the dV calculator here is ignoring Decane, correctly interpreting it as RCS. (though I may put less Decane and more Xenon, as a Xenon mass ratio of 1.64 is relatively low))


As you can see, switching between resistojets and MPDs has a pretty big effect on dV (putting both shows slightly more than Decane only: while the ship design recognize Xenon as the main engine, strategic movement does not).

Brothers and sisters, have you embraced Boron as your Lord and Saviour ?

I'd like to present you my failed attempt at making a 100mc fleet for the challenge. It almost got to 100.. frankly if I skimp on the delta V it will probably get there, so all is not lost.. .
I'ts also my first fully boronified fleet. Before this I was using it for armor, gun barrels  and turret armor. Now there is boron everywhere - it even got UHMWPE out of the tanks - price was too high. 

So the lady herself :



I'm aware that everyone thinks that 3cm of boron is too much, but frankly I was getting good results before with this setup and I'll have to do more tests if I'll choose something else. Ship is a pure carrier with only defensive lasers and guns. Design revolves around redundancy - powerplants at two places - double launchers for every drone type. Only the defensive missile is a single launcher - with intentionally delayed launch each 4 seconds in order not to waste two missiles at each target.

Guns and lasers are arranged so there are at least 4 of each pointing at every direction. I would love to be able to angle the turrets a bit forward to cover the front blind spot but for the moment this is not possible.

The drones :


First the NEFP missle / gun drone

Everything is doubled again - 2 powerplants , 2 tanks , ammo is again separated everything is concentrated away from the gun at both extreeme sides of the drone. 




The main cannon is on the left - fires 100g rounds relatively slowly. Sort of to finish what the missiles started. 




The other two of the attack ones , N is armed with a NEFP gun , 40 charges and 2x small cannons. The F version's gun fires a small flak missile - role is a pure radiator buster and laser bait. The NEFP gun is used only close or when the target is immobilized. Again 2x20mm small cannons - nothing interesting there, you can see the gun above - next to the 36mm one. Its just very very small.



Next the largest and the smallest drone in the inventory : Valkyrie is the last and finally practical version of the large 20mw laser drone that I started a while ago. Main job is to keep away everything from the carrier. Nisse is my new micro drone. Its not fully redundant as the other ones since I wasn't able to build a small enough powerplant for this, so it has only one. 



Next is the most important drone in the group - the small defensive/escort laser drone. As you may have noticed everything is methane fueled. Funny but I've run a full circle with this. For a while I liked the idea of hydrogen deuteride for the capital ships - loads of delta V. But my drones were always decane fueled - liked the compactness of it. On the other hand I always liked the idea of a unified fuel for everthing. After a bit of wiggling around I finally settled to trying the stock option - methane. Turns out the obvious answer is the right one. Methane gave me the ability to do lighter cheaper drones at the same time the capital ship reached 8.7km/s delta V without any problem. Sure its bigger than the small decane carrier that I tried but almost 9km/s was not a viable option there without unreasonable sacrifices.
 As you can see on the picture above a slightly bigger methane version of the drone has 0.5MW more power, double powerplants compared to only one for the original. More than 100kg lighter and almost 2k cheaper.

Missiles:



Left is the NEFP missile for the C version of the Berserker. Right is the micro missile for the F version. The later one has the tendency to miss when launched at a big distance but then again its giving the enemy's lasers something to fire on.


The defensive missile for the capital ship :



I've seen a very similar role and design by Nivik. This one reliably intercepts missiles and is suprisingly efficient at killing enemy ships as a secondary role, but lacks the aerogel to survive laser fire. At 45c and 14 kg  the ship packs easily 2000 of them.

So the complement is 150 attack drones - 50 each C F and N. 1000 Nisse micro drones. 200 escort Shieldmaiden IIIs and 20 Valkyries.
Usual tactic involves keeping the Valkyries for protection. Shieldmaidens escort the carrier + every attack group. Attack groups usually consist of 5 drones for FPS reasons and the types shift from C and F at the start and N and micro drones at the end when the enemy is not very... lively. Micro drones are very usefull for finishing off separated ships and blocking enemy drone groups. Just keep them away from lasers.

If anyone wants more details on anything I'll post additionally , this is way too long already.