Oh of course the Halb was a dog compared to later models. Air technology advanced rapidly through the war, and I do get the impression the Albs were superior, to think nothing of the later SPADs.
You can get some basic numbers from WOFF itself. ROF posts all their stats online in their store. Wikipedia may not be the most reliable in the world, but it does have stats for most of the A/C.
Here's a comparison of the three for the Halb vs. Alb
Albatros D.II
Source Weight Speed Ceiling Range Engine Weapons
WOFF --- 109 17 163 mi 160 2x7.92
ROF 898 102 16.4 80 mn 160 2x7.92
Wiki 888 110 16.9 90 mn 160 2x7.92
Halberstadt D.II
Source Weight Speed Ceiling Range Engine Weapons
WOFF --- 90 13 135 mi 120 1x7.92
ROF 728 90 19.5 154 mn 120 1x7.92
Wiki 729 93 --- --- 120 1x7.92
Weight: kg
Speed: mph
Ceiling: thousand feet
Range: mi = miles, mn = minutes
Engine: horsepower
Weapons: mm
The only major discrepancy is the Halb's ceiling. ROF and WOFF both seem to agree the Halb. was distinctly inferior.
