Auto-Pitch control.

[fruitbat]

Originally Posted by Kurfurst

Since production of the E-4 (the most important type during the BoB) commenced in May 1940, so I suppose when the E-4 will be introduced it will feature the auto prop pitch and armor.

you sure?

Hooton in Eagle in Flames gives the percentage losses of 109s by subtype:

July
E1 - 44%
E3 - 30%
E4 - 20%

August
E1 - 40%
E3 - 8%
E4 - 52%

September
E1 - 38%
E3 - 1%
E4 - 61%

October
E1 - 36%
E3 - 2%
E4 - 62%

and from Kurfust, over at ubi a while ago,

"I have some actual numbers. On 31 August 1940, fighter units (excluding JG 77) reported 375 E-1s, 125 E-3s, 339 E-4s and 32 E-7s on strength, indicating that most of the E-3s had been already converted to E-4 standard. JG 77 had around 100-125 aircraft with it, but for the rest of the units, its 75% cannon E-3/4/7, the rest are all MG E-1s. The E-1 and E-3 were produced parallel and in about equal numbers from the end of 1938, but by mid-1940, the production of the E-1 stopped, replaced by the E-4 and then the E-7."

and

In Ulrich Steinhilper's book 'Spitfire on My Tail', he relates quite clearly that they, JG52 didn't get there first cannon armed 109's until mid september , and then only 2, which were hand me downs from another unit. Rest of the unit bar these 2 planes was still in E1's.

Seems to me the E1 was the most important, certainly until september

of course, i understand why you don't what this too public.....