Thanks CapFlyer, I wasn't aware of those R4Ds.

Any pics or more info?
Holedigger wrote:
Ju52/3s were also employed as bombers in Spain......didn't work well, so they didn't try that again! If it is designed to carry people or cargo, perhaps THAT is what it is best used as! But when you are caught short, you will use what you have.
Not sure about that, what's your view based on?
Having researched the early Ju 52/3m bombers for an article, I understand the Ju 52/3m was a perfectly effective bomber in the earlier stages of the Spanish Civil War. It wasn't a lash-up either, with internal bomb cells and a defensive barbette on the rear fuselage and a 'pot' for a bomb-aimer gunner. The bomber version (you're right that it was designed as a transport) wasn't a disaster at all. There was a vogue for bomber transports in the mid 1930s, (Savoia Marchettis being the other main type used in the Spanish war) which were good enough at the time, but by W.W.II were no longer viable.
The Ju52/3m bomber was outclassed later in the Spanish Civil War, but no more so than other contemporary types, and for the same reasons; speed and armament. To suggest it wasn't very good misses the point it was the main type of the period and responsible for the bulk of the bombing, with a reasonable survival rate and average accuracy (that's another story!).
Cheers,