Lord, after some consideration and conversations I don't think you will achieve your charging specs with the A-4 and an "off axis" drive. The reliability due to the strength of the set up is just to suspect.
The A-4 has the power but it needs to be transferred axially and then you seriously lack RPM's to achieve an efficient alt speed. About the only reliable way I can see harnessing the power from an A-4 is mounting a planetary drive between the engine and alt. That way the loads can be absorbed by the mounting pads and not all of the stuff hooked together.
Another possibility that may just help with space considerations is a hydraulic drive. They are quite sturdy and operate quite efficiently.
Both of these types of drives could readily be mounted to either end of the engine.
Dave Neptune
