StRaNgEdAyS
Well-Known Member
The aircraft I am preparing to build, the KR2S has wings constructed on wooden spars with 5 of 2" foam ribs with 1' deep foam blocks glued between the ribs, sanded to contour, leaving an empty space in between. the Glass (2 of BID) is then layed up over the foam, leaving no internal layers under the foam. This method did concern me a little as I understand the strength in this application is provided by sandwiching the foam between the layers of glass. The method as laid out in the manual (and by many other builder's online logs) shows no such sandwiching, just the aforementioned layups ovet the top.
Would I be better off to hotwire the foam to full depth sections, making and glassing appropriate spaces for the bellcranks and rods (holes for cables etc can be drilled via the conduit method prior to covering), glueing the sections in place around the spars and then laying the glass?
This way I would end up with a proper sandwich construction, with the foam running the full depth of the section, and probably better peace of mind.
Would I be better off to hotwire the foam to full depth sections, making and glassing appropriate spaces for the bellcranks and rods (holes for cables etc can be drilled via the conduit method prior to covering), glueing the sections in place around the spars and then laying the glass?
This way I would end up with a proper sandwich construction, with the foam running the full depth of the section, and probably better peace of mind.
