There are a total of 294 serviceable JU-87 aircraft in the inventory in units facing England.sitalkes wrote: The batteries in open positions and open casemates would have been vulnerable to dive-bomber attacks. There weren't any dive bombers on the Allied side in Normandy in 1944, when the Germans often (but not always) had properly designed, fully enclosed reinforced concrete bunkers designed to resist heavy calibre naval guns. Those positioned to fire across the beach didn't even have embrasures facing the sea and could not be silenced until somebody with explosives or a tank got close enough. In 1940 the coastal emplacements (even the ones in forts) were in open positions or rectangular ones made out of bricks with open fronts.
The Norwegian Batteries were in open positions and none were knocked out be German dive bomber. Japanese positions in the Pacific were hit by dive bombers, but often were not put out of action. The Japanese attack on Midway with over 100 aircraft did not put many of the batteries out of action
The British batteries were generally heavily camouflaged. There were also dummy sites. The Germans flew very little photo recon over the beaches (compared with over 3,000 sorties over the D-Day beaches) and had absolutely no humint in the UK. This will make the job of the dive bombers much harder. Plus the use of smoke by both sides will make these batteries even more difficult to attack.
Also the German Dive Bombers are supposed to keep the Royal Navy at bay, hit British air fields, interdict British counter attack, suppress British artillery and attack British railways and road systems. One of their critical missions is supporting the paratroopers. Even if the 300 odd Stukas are flying 2 sorties a day they can't meet all these obligations. Also, how long can they maintain this operational tempo? What sorts of losses will they suffer? If there are any fighters around the Stukas will get thrashed, as they did historically.
The Stukas are the most effective aircraft the Germans have against surface ships. They are the best support for the paratroopers. They are the only aircraft that have a good chance of silencing the coastal batteries. They would be the most effective at attacking armored units and artillery. But there aren't enough of them to perform all these missions. So what would the choices be? Remember that the German air force has to defend both flanks of the invasion area all day long. Stukas have a range of 300 miles with a 500 kg bomb load. Dunkirk to Brighton is over 100 air miles. This means almost no loiter time over the western edge of the battle area. Assuming 8 hours of coverage is required and 25 aircraft in a group that means 200 sorties just for that mission alone.
This has long been one of the biggest problems I see with Sealion. The Luftwaffe doesn't have enough aircraft to meet all the missions they need to perform to support the Invasion.