Quote The engine looked like a radial due to the arrangement but the internal workings were more like a V engine From Janes Fighting Aircraft of WW Type Twenyfour cylinder multibank radial Connecting RodsSplit master rods and five articulated rods in each of the four banks of cylinders  From wikipedia In a radial engine the pistons are connected to the crankshaft with a masterandarticulatingrod assembly  In summary it is unlikely the Jumo  could have been anything other than a radial engine the difficulty of connecting  planar cylinders around a single crank using any other method than the radial type masterarticulated rods would have been immense