During the BoB the Stuka only proved vulnerable when left exposed to fighter attack. This happened because it was being used (or mis-used) in a role for which it was not intended. It nonetheless caused considerable damage.
In the period leading up to the BoB they were less exposed,attacking targets in the channel and on the South coast. Ask anyone who was at one of the British airfields attacked.Dettling was flattened,22 bombers destroyed along with workshops and hangars,the station CO was killed. Manston,Hawkinge,Martlesham Heath,Tangmere,Ford,Lympne and a host of others were attacked. Some were badly damaged or rendered inoperable for a period. The RN lost HMS Foyle Bank,HMS Sandhurst,three destroyers and four lesser ships. 40,000 tons of merchant shipping was sunk. Many more ships were hit and badly damaged.
Total Ju 87 losses for July 1940.....12
At the start of Barbarossa the Stuka was once again used in it's intended role. In the intense fighting of the first 18 hours of Barbarossa it is estimated that 1,800 Soviet aircraft were destroyed. The Luftwaffe lost 20 to enemy action of which only 1 was a Ju 87. That's a pretty good return!
As the campaign progressed the Stuka was used in a CAS role which would look familiar today. Control was provided by a Panzer Verbindungs Offizier (Tank Liason Officer) who was a Luftwaffe officer travelling with the forward panzer columns. The Stuka units proved themselves to be highly mobile,moving rapidly to keep up with the advance. Only 24 Ju 87s were lost in the opening weeks of Barbarossa,again showing that the aircraft was not vulnerable when employed correctly.
It was also reliable,during this period the Ju 87 units were flying an average number of daily sorties equivalent to 75% of establishment strength. Few aircraft do that operating from home bases and these units were moving rapidly at the end of a very long supply line.
Total Ju 87 losses for September 1939 to June 1941 to all causes was 260. Good value for money,to this date the cost of Ju 87 production was a mere 3,059,000 RM.
Cheers
Steve