Here I will name some German weapons that should have NEVER been tested or gone into production: Me 163: Despite being beyond fast and maneuverable than the typical fighter of it's day, it's 8 minute fuel length prevented it from being a an effective aircraft as this did not give people enough time to train in it, and was too fast to attack on aircraft(I am aware it was designed as a point defense interceptor), both factors reducing its effectiveness. It claimed 16 aircraft for 10 losses, already ineffective despite 300 being built. Along with infancy of the rocket engine which could leak and cause an explosion. Schwerer Gustav: The first problem was that this was WAY too big. It took up to up to 25 railway cars to pull and it needed special tracks to transport it, needing a couple thousand men. It can only fire 14 rounds a day and takes 3 and a half days to assemble. A squadron of light bombers would have have been way MORE devastating and much cheaper than this gun. Considering the fact that this gun was used extensively on the eastern front, where the Luftwaffe had ruled the skies from 1941-1943, this should have been the case. This the Karl-Gerat and any railroad artillery wieghing over 100 tons could be in the same category. Panzer VIII Maus: A Tank which was only tested because of Hitler's megalomania for large tanks. Perfect for the field imagination. This tank ignored all the basic principles when designing a tank. Mobility, weight, and speed, attributes which made the German tanks of the war successful(although Tiger I lacked in these areas too, it was enough for the battlefield). Even though it was heavily armored, this would have hardly mattered as multiple tabks could have flanked it and take turns shooting at it. It had a range that could barely get past 50 miles on a good day, and struggled to reach over 10 mph.This and any other super-heavy tank to see the testing range or design board. Type XI submarine: I really don't know what was going through their heads when they were making this. Now please correct me if I am wrong or making any exaggerations but I cannot understand the strategic importance of this type of ship. I understand the concept an underwater submarine that would carry a couple seaplanes as reconnaissance and then submerge back down when escaping. On paper this may sound great, but in practice, how would they recover the plane? What about when there are rough seas? Would the artillery on the U-Boat be useful in taking out ships(this part can be debated)? Even the I-400 submarines which had been tested took nearly double the time to submerge compared to US submarines and were easier to detect on radar due to it's flat surface. The V-weapons: Principally the V-1 and V-3. I think it is debated whether the V-2 was effective, but on the weapons that I believe were ineffective. First off the V-1, now I do believe it some potential as it did carry a warhead weighing nearly a ton, had decent range to strike London(around 150 miles) and was very cheap to produce(around 5,000 reichmarks), however, it entered the combat theater too late in the war to make a difference. It's distinctive buzzing noise, slow speed along with Britain's emphasis on anti-aircraft defenses and point defense interceptors on the island completely made the weapon's effectiveness reduced significantly and was only useful in psychological warfare. The V-3 was just a mess. It was a weapon that may have been good on paper, but like I said earlier, not everything sounds great on paper. The fact that it was a huge gun situated in one place made it impossible to hide it from someone. So French resistance or a bomber squadron could damage or destroy the gun and that is what happened to one of them, destroyed by a bomber late in the wear. They weren't even effective at all. When two were used to bombard a village only 10 died had died despite over 100 shells being fired. I don't the V-2 was that ineffective for being nearly impossible to intercept. I just feel as if it wasn't utilized enough and was too expensive to produce. Feel free to write down what other weapons you believe were useless or did not help much to the war effort. They don't have to be German. I just principally know German weapons.