Hi,

In Robbe 1970 catalog theyhave Enya 60 II RC as recommended engine. In 1977 Robbe catalog they have Enya 60 III B RC-G 8 and Enya 60 XF RC listed as recommended engines.

Mäxi was designed by Heinz Elsässer. I believe he was German F3A (then named RC1) champion with Mäxi in 1968. He competed in World championship 1969 with Mäxi (I do not know his exact place) and then he used Enya 60 II RC (also Phil Kraft from US that placed 2nd used Enya 60 II RC).

Today if you plan to use a modern 2-stroke I would probably select OS 55AX or similar http://www.osengines.com/engines/osmg0556.html

Take care of the model, it is a true classic pattern plane. And is capable, if built light and straight and in hands of a good pilot, to perform very well (by the standards it was designed for in end of 1960th and beginning 1970th.

/Bo