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FcoChile
1-Sep-09, 12:26 PM
I am about to start building a stretched Sevtec Surveyor. I will be using System 3 epoxy with 6oz cloth. I have seen a few sites where the builder uses Foamular foam. Mainly because it costs so much less than other core material; it is also very light. Does anyone have experience with this?

John Robertson
1-Sep-09, 12:54 PM
Not recommend - it's a polystyrene insulation board and isn't structural (no shear strength is specified for a good reason). To get decent structural strength in a composite you would need to use 50-75mm thickness of foam rather than the 12mm specified in the plan

It might be better to use a proper structural core material and offset the extra cost by using polyester or vinylester resin instead of epoxy?

atters
1-Sep-09, 12:59 PM
See, told you, these guys know it all and have most prob. done it too.

Welcome Fco and hope your build goes well.

FcoChile
1-Sep-09, 04:54 PM
Thanks for the information. I will probably just use some for the cabin enclosure and thrust duct. I am not expecting much impact in those areas.

curtis5420
1-Sep-09, 07:58 PM
the thrust duct has to be structural sound enough, to contain a blade failur!