Hello Micheal.
No, Weal's book does not say what type he flew. What edwest posted is all there is.
But according to the Kracker database -
http://www.aircrewremembered.com/Kra...=jakobi+alfred
and the Luftwaffe Officer Career Summaries he flew E-7s and was lost in an E-7 red 2 WNr 1494.
Peter