Effectiveness of bombs and rockets

Are the blast effects realistic? The other day I flew a mission I'd made in Mission Builder; I dropped a 500 lb bomb from a RAF Kittyhawk smack dab between a pair of closely-parked Ju-52s... bomb exploded nicely, no damage to either?
Last night I was experimenting with rockets in air-to-air mode; flew an F4U-5 Corsair against Tim 'Piglet' Conrad's excellent An-2. From 100 yds or less I unleashed a salvo of 5" rockets at the big biplane, explosions happened, and yet the Antonov kept on flying. (Then I downed it with a few 20mm cannon shells).
So what's happening? Why is it I can destroy buildings with machine gun fire, while aircraft as targets seem to be more resistant to bombing?
Can I tweak the bombs and rockets to be more effective?
If so, how?
J_o_J
Last night I was experimenting with rockets in air-to-air mode; flew an F4U-5 Corsair against Tim 'Piglet' Conrad's excellent An-2. From 100 yds or less I unleashed a salvo of 5" rockets at the big biplane, explosions happened, and yet the Antonov kept on flying. (Then I downed it with a few 20mm cannon shells).
So what's happening? Why is it I can destroy buildings with machine gun fire, while aircraft as targets seem to be more resistant to bombing?
Can I tweak the bombs and rockets to be more effective?
If so, how?
J_o_J