The MG FF was simply not ever developed or mounted to fire linked ammunition, the MG151 was. The German drum was 60rds although the Japanese made one for 90rds and I don't see any reason the Germans couldn't have placed a 90rd drum into production.
The ammunition box for the MG151 is 200 rounds of 15mm in a motorkanone fitment. When upsized to 20mm only 150 rounds could be carried due to the increased size of the shells.
The MG151 was in development by 1938 and intended to be fitted to the Me-109 (E).
The Oerlikon was Swedish, it was very old and the MG151 was simply the next step for development of an idigenous German heavy calibre aero gun.
I think it is safe to infer that if a chain linked box was developed for the MG FF which it never was, that it could carry a maximum of 150rds in a motorkanone fitment rather than 200rds, which was the ammunition store for the 15mm MG151 centreline box (mounted in the port wingroot). All 20mm motorkanone with linked ammunition fitted to the 109 had a 150rd ammo box in the port wing root. All 15mm motorkanone in the 109 had a 200rd box.
Also I frequently read completely inaccurate technical specifications listed in commercial publications and on websites, particularly about the Me109. This includes imaginary production variants with MGFF motorkanone, actual production variants with imaginary MGFF motorkanone, imaginary engine variations, imaginary variant deployments, and completely misunderstood and improperly described boosting systems. Often editors aren't very mechanically qualified and work with third party research.
Best references are primary source data or a combination of detailed research and personal qualification.
According to many researchers citing primary sources there is no evidence to support any motorkanone fitment of the MG FF in any production and service 109 ever, though it was tested on prototypes and development models. However there are enough anecdotes to suggest that some E-3 may have, which I say very loosely, may have been custom fitted with an MG FF motorkanone, there is simply no standing evidence for it.
Here's an odd thing however. The 109F-1 entered production late in 1940 which was before the MG151 and some sources claim it was fitted with an MGFF/m motorkanone in lieu plus 2x MG17. The entire run was grounded and recalled in January following some fatal structural failures. When the F-2 appeared several months later it had the MG151 with 200rds of 15mm.
If the F-1 had a MGFF/m, it had a 60rd box, of this there is no question.
The ammunition box for the MG151 is 200 rounds of 15mm in a motorkanone fitment. When upsized to 20mm only 150 rounds could be carried due to the increased size of the shells.
The MG151 was in development by 1938 and intended to be fitted to the Me-109 (E).
The Oerlikon was Swedish, it was very old and the MG151 was simply the next step for development of an idigenous German heavy calibre aero gun.
I think it is safe to infer that if a chain linked box was developed for the MG FF which it never was, that it could carry a maximum of 150rds in a motorkanone fitment rather than 200rds, which was the ammunition store for the 15mm MG151 centreline box (mounted in the port wingroot). All 20mm motorkanone with linked ammunition fitted to the 109 had a 150rd ammo box in the port wing root. All 15mm motorkanone in the 109 had a 200rd box.
Also I frequently read completely inaccurate technical specifications listed in commercial publications and on websites, particularly about the Me109. This includes imaginary production variants with MGFF motorkanone, actual production variants with imaginary MGFF motorkanone, imaginary engine variations, imaginary variant deployments, and completely misunderstood and improperly described boosting systems. Often editors aren't very mechanically qualified and work with third party research.
Best references are primary source data or a combination of detailed research and personal qualification.
According to many researchers citing primary sources there is no evidence to support any motorkanone fitment of the MG FF in any production and service 109 ever, though it was tested on prototypes and development models. However there are enough anecdotes to suggest that some E-3 may have, which I say very loosely, may have been custom fitted with an MG FF motorkanone, there is simply no standing evidence for it.
Here's an odd thing however. The 109F-1 entered production late in 1940 which was before the MG151 and some sources claim it was fitted with an MGFF/m motorkanone in lieu plus 2x MG17. The entire run was grounded and recalled in January following some fatal structural failures. When the F-2 appeared several months later it had the MG151 with 200rds of 15mm.
If the F-1 had a MGFF/m, it had a 60rd box, of this there is no question.