parsifal
Colonel
Here is a link to a website that is a pretty good summary of the development of unguided rockets since 1940.
[7.0] Unguided Rockets
With regard to the germans developments, they were working on a number of very promising developments at the end of the war. Whereas allied rockets used underpowered motors and fin stabilized ballistics, the Germans opted for smaller warheads and spin stabilized rockets, similar, in concept at least, to their nebelwerfer rockets. Spin stabilized is inherently more accurate whilst the smaller warhead size meant also an inherently more accurate delivery system. On the other hand German aircraft rockets would have been less potent than their allied counterparts and hence needed more accuracy to be effective
[7.0] Unguided Rockets
With regard to the germans developments, they were working on a number of very promising developments at the end of the war. Whereas allied rockets used underpowered motors and fin stabilized ballistics, the Germans opted for smaller warheads and spin stabilized rockets, similar, in concept at least, to their nebelwerfer rockets. Spin stabilized is inherently more accurate whilst the smaller warhead size meant also an inherently more accurate delivery system. On the other hand German aircraft rockets would have been less potent than their allied counterparts and hence needed more accuracy to be effective