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On the Jet canopy test I built both the 3 x 10mm poly carb screen and the sleds for both. Think it was a F16 canopy we mounted on the sled as you can see it took the impact well. The 3 x 10mm poly carb was done because of difficulties in getting and bending 30mm polycarb. The 3 layers were bonded together with epoxy, but not really as good as a 1 layer canopy as you can see it delaminating on impact, so inconclusive unless we can buy and bend solid 30mm sheet.