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Plywood vs Stck Ribs and When Are They Intercangeable?

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rbrochey

Well-Known Member
Joined
Oct 17, 2010
Messages
1,569
Location
Gallup, New Mexico USA
I notice that in many designs there is an option for using ribs made with plywood or the good old stick rib types... I opt for anything more efficient to build and with my router table have made many forms very quickly, guitar molds and other things... so my question is, is it always acceptable to make plywood with lightening holes instead of those labor intensive stick ribs if they are the same in every other way? Or is it only sometimes that you can go either route? A case in point, the HM 295 ribs... can you safely and efficiently use plywood wing ribs? I know the rudder ribs are 6 mm X 12 mm spruce sticks covered with a ply web... (I know the web and a singular ply rib is not the same thing) why not a similar wing ribs? Is it weight? What? And if you can do either how do you calculate ply thickness, curious minds want to know... thanks

This

fleawing1.jpg


Or this (if no why not?)

fleawing2.jpeg
 
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