David,

Rögamodell Magic 40 (and I'm sure Magic 60 also) has epoxy fuselage and epoxy top deck. The cowl is ABS that is meant to be reinforced with some layer of epoxy+weave inside for extra strength - would be easy to make an allepoxy cowl with the ABS cowl as mould. There is also an ABS part to cover underside wing at fuselage.

It is not mentioned any special make and model of .40 engine (on box it say only "Motor 6,5 ccm"). In the building instruction it is mentioned two part numbers to Rögamodellcatalog for exhaust bend, one for engine with side exhaust (part no 01 4009) and another for rear exhaust (part no 01 4008). Hanno Prettner had in his Magic 60 a Super Tigre X 61 TST RE RC with Super Tigre pipe. Super Tigre had also at this time, 1982, an X 40 RE RC with pipe so I guess that could have been used. But probably Rögamodell had some prefered engine make and model for their Magic 40. But I have not any Rögamodell catalog from that time so I do not know.

Your OS40 VF: Is it not a ducted fan engine? Maybe little to high rpm engine for this pattern plane? (remember Hanno Prettner was using a Kato variable pitch prop on his Magic 60 and wanted low RPM - about 12 000).
YS 45FR: If it is side exhaust that is probably one disadvantage since rear exhaust engine on a Magic (40 or 60) would be better, to geta straight exhaust line and not need to have a sligtly turned clockwise (seen from front)engine. There is a picture in Rögamodell building instruction about side exhaust engine mounting.

I have MK Magic 60 plan also but need to scan it and convert to PDF, then I can post it here (probably next week).

If someone want to have a look at RCM & E Magic 60 plan I have a high resolution scan from RCM & E April 1982 construction article of Magic 60 where drawing is shown. Reasonably good quality that I converted to PDF.

/Bo</p>