OK, Been back in this modeling lark for a year or so but still not sure exactly what a "D Box" leading edge actually is. 
I've started in a model which requires a 1.25" LE and thought of replacing it with a moulded version (I had decided to soak some 1/8" balsa and wrap it around a preformed LE section). Then place Webbing between the ribs. Is this effectively a "D Box" or something different? (Like a recipe for disaster possibly). Should I cut the ribs to include the LE section and slot it over the front and insert the webbing between the ribs or build it as a separate unit?
Yes, that's a 'D' tube section. Terminology varies -- usually a 'D-tube wing' or 'D-tube spar' refers to a structure where it's sheet back to the first spar, with shear webs. But a 'D-tube leading edge' certainly sounds right for what you're doing.
You could either make the D-tube ahead of time then put it on flat-faced ribs, or you could make round-faced ribs, put the molded leading edge on, then put in shear webs. I think that getting the alignment good would be easier with the latter method, but I'm not in your workshop so I can't say what'll work best for you.
I don't have any plans which show this method but I'm sure I have seen it on others models at some time or another and I've been told as far as weight verses strength it's a lot stronger than simply using some pre shaped LE stock.
Like I said I know this is a really basic question but I just want to try to understand what I am considering attempting and is it an accepted practice or just a stupid idea.
As far as stiffness and strength in twisting and bending, it's really the outer skin of the part that does the work. You can hollow it out without losing much of that strength. As far as being able to stand up to smacking into your flight box because you weren't paying attention when you launched, a hollow section leading edge will shatter a lot easier, and will be more difficult to fix. Pick your poison.
Topic: I'm almost too embarrassed to ask but.... (Read 1315 times)