Well obviously, if a plane is flying 100 feet or meters off the ground and and flying at only 50 miles per hour, the bomb would hit the ground and explode before the plane could get far enough away to escape from the blast. But could a realistic plane chosen to be a bomber find it impossible to fly high and fast enough to escape from the blast of an atomic bomb it dropped? And if so, what would be the parameters of the situation?
This is inspired by this question at History stack Exchange:
On the planet Earth, in our real history, airplanes were highly developed by the time that atomic bombs were invented, and airplane bombing had already killed tens and hundreds of thousands of people.
And a writer can always arbitrarily decree that in their fictional world nuclear physics advanced much more rapidly than on Earth while aeronautics advanced much more slowly, and thus when the first atomic bombs are invented the only airplanes with enough cargo capacity to carry and drop atomic bombs fly too low and too slow to get away from the blast in time.
But what about a world designed so that it would be very difficult for the natives to have advanced enough aviation when they develop atomic bombs and for as long a time as possible after that?
The natives could have a different body plan than humans and be much smaller or larger than humans. If they are much smaller than humans, their planes might be much smaller than human planes, and so building a plane big enough to carry an atomic bomb might be very hard, and the first planes capable of carrying atomic bombs might be incapable of lying fast or high.
Possibly the natives are the size of the largest elephant species or of sauropod dinosaurs and can only build one person airplanes, and those don't have enough cargo capacity to hold atomic bombs.
Maybe they can't drop bombs with parachutes to slow down the descent and give the plane time to get away because every place they want to bomb is too windy and the bomb would be blown off target.
I'm thinking that an Earth like planet with higher surface gravity would probably have a compressed atmosphere where atmospheric pressure would drop off more steeply with altitude. If the atmospheric pressure is too great for the natives to survive at sea level, they might only be able to survive in highland areas. If the surface gravity is much higher than on Earth, a bomb would fall much faster, giving a plane less time to get away from the blast, so the plane would have to fly faster. With a compressed atmosphere, the plane would have a lower altitude range compared to Earth, and so would have to drop the bomb at a lower height above the target.
And possibly the natives haven't invented the internal combustion engine yet and/or don't have access to petroleum to refine into airplane fuel, and thus have very inefficient airplanes.
So can anyone calculate what such a planet would be like to have have airplanes incapable of delivering atomic bombs and surviving the blast?