PrefaceStrategic raiders tend to come in at very high altitudes. Because unlike with tactical (base) attacks, it totally pays off to spend that much time for a climbout because
- There's no dynamic battle situation to account for
- Three hours of object downtime doesn't mean your 1 hour of climbing is wasted for killing something that's back up in 15 minutes.
This faces the defender with a real challenge, especially as with the new dispersed strats and a strat raider is not easily to spot any more.
The question is: What is the closest distance the incoming bomber can have for an interceptor to take of with still at least a minimum chance of engaging successfully?
The setting: Interceptor:Assumes taking one of the best planes for the job in terms of climb rate, speed, and firepower: The Ta 152H with 100% fuel
The interceptor takes time to get to altitude, to get up to a reasonable combat speed (400mph) and needs time to combat the bombers. The latter one I set to an arbitrary 5 minutes, though in the case of 30k+ bombers this is an extremely short timespan with little chance to kill all three bombers.
Bombers: Assumes three very typical cases:
Lancaster at 20k
B-24 at 25k
B-17 at 34k (maximum loaded altitude and much more prevalent than some might think)
B-29 at 30K and 34K as well.
I tested the bombers combat speeds with bombs, as well as the climbing time of the Ta 152H (Full initial WEP) to the respective altitudes.
I spare you the details and jump directly to
the results:Bomber min. distance
Lancaster 61 miles
B-24 75 miles
B-29 at 30k
& B-17 @ 34K 110 miles
B-29 @ 34k 140 miles
I have to emphasize again that especially with the very high altitude bombers, these are the bare minimum distances, only very few fighter pilots will actually have a chance to get the job done before the bombs are falling.
To show what these distances mean on a map, I visualised them on the current map, Fester (mainly just because I had the graphics up anyway). But you can easily transfer this to most other maps in rotation. Just think of NDsisles with the factories being right on the frontlines!

The range circles were centered on City and on the AA factory.
As you can see, the high alt minimum distance circles are already extending past the front lines. Which means what you thought to be the darbar of some Jabos or bombers doing attacks on some nearby bases may actually turn out to be city raiders.
Unless they fly in "carelessly" low or are unlucky, most shot down strat raiders die only logn after they dropped their bombs.
The only reasonable solution for that dilemma: Flying cap over the strats.
But the relatively small population during much of the day, dispersion of the strats and most importantly the fact that it takes only one buff in three hours to have alasting effect makes it not a very realistic option - because it very well might include 1-2 hours of uneventful crusing up& down.