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I use 6mm depron for the cr's and fins(laminating them if needed for the fins.
I use 2mm for the skin.
I've tried 1mm but it is stiff and will kink in a curve, 3mm doesn't bend so well as 2mm.
I get mine from rcfoam.com In boxes of 10 or 20 it is around $8 or $9 a sheet. for 6mm and about $5 or $6 for 2mm.
But I have a local hobby shop that carries it as well for a dollar or two more a sheet.
It's not dirt cheap, but the cost of the rocket is not primarily the foam, it's tubes and other stuff. On this model I used 3 sheets of 6mm and 1.5 sheets of 2mm.
You could certainly use the paper covered foamboard from dollar tree for the cr's andstringers and use depron for the skin/fins, A lot of people soak and remove the cardboard from the foamboard to save weight.
Frank
I use 2mm for the skin.
I've tried 1mm but it is stiff and will kink in a curve, 3mm doesn't bend so well as 2mm.
I get mine from rcfoam.com In boxes of 10 or 20 it is around $8 or $9 a sheet. for 6mm and about $5 or $6 for 2mm.
But I have a local hobby shop that carries it as well for a dollar or two more a sheet.
It's not dirt cheap, but the cost of the rocket is not primarily the foam, it's tubes and other stuff. On this model I used 3 sheets of 6mm and 1.5 sheets of 2mm.
You could certainly use the paper covered foamboard from dollar tree for the cr's andstringers and use depron for the skin/fins, A lot of people soak and remove the cardboard from the foamboard to save weight.
Frank