Ok, what you think? If it's done right, how much % of weight increase can be expected between single 6oz bottom or double 4oz bottom. As a matter of specific reference, how much actual weight will (for the sake of comparison) a 7'6" 12" x 21" x 14"x 3" gain? Will the strength gained be worth the weight increase if it you consider it a significant amount? Aloha, Rich

>>> Ok, what you think?>>> If it's done right, how much % of weight increase can be expected between > single 6oz bottom or double 4oz bottom. As a matter of specific reference, > how much actual weight will (for the sake of comparison) a 7'6" > 12" x 21" x 14"x 3" gain? Will the strength gained be > worth the weight increase if it you consider it a significant amount? Let's make it an elipse for simplicity: The area of the board would then be A = PIab So (7.5/2)x(1.75/2)xPI = 10.3 ft squared. Let's say 11. If we use noodles formula with 1.5oz resin pr. foot of board length pr. 6oz layer we end up 11.25oz of resin for 6oz cloth. For 2x4oz we add 25% and get 14oz, assuming the ratio of glass to resin is 1/1. The density of resin is just above 1 I guess, but the leftovers will make up for the shortcuts in the calcualtion. 4oz: 2x4oz pr sqyrd / 9sqft/sqyrd x 11 sqft + 14 oz = 23.78 oz 6oz: 6oz x pr sqyrd / 9sqft/sqyrd x 11 sqft + 11.25 oz = 18.58 oz Okey, so the fluid ounce and the weight ounce is not the same, but close. 5.2oz difference. Then the weave has to be filled with hotcoat and since the 6oz weave is rougher you have to use more resin, so the difference shrinks a little. Would you notice a 5oz difference in board weight when your standing on it? Another thing would be how it turns out in practice, how much more resin youll need to wet out two layers vs. one, etc. The pros would know. Two layers of cloth is supposed to be stronger then a single cloth at the same weight. 2x4oz is even heavier the 6oz so I would assume you would gain a considerable amount of strength. regards, Håvard

>>> Let's make it an elipse for simplicity: The area of the board would then > be A = PIab So (7.5/2)x(1.75/2)xPI = 10.3 ft squared. Let's say 11. If we > use noodles formula with 1.5oz resin pr. foot of board length pr. 6oz > layer we end up 11.25oz of resin for 6oz cloth. For 2x4oz we add 25% and > get 14oz, assuming the ratio of glass to resin is 1/1. The density of > resin is just above 1 I guess, but the leftovers will make up for the > shortcuts in the calcualtion.>>> 4oz: 2x4oz pr sqyrd / 9sqft/sqyrd x 11 sqft + 14 oz = 23.78 oz 6oz: 6oz x > pr sqyrd / 9sqft/sqyrd x 11 sqft + 11.25 oz = 18.58 oz>>> Okey, so the fluid ounce and the weight ounce is not the same, but close. > 5.2oz difference. Then the weave has to be filled with hotcoat and since > the 6oz weave is rougher you have to use more resin, so the difference > shrinks a little.>>> Would you notice a 5oz difference in board weight when your standing on > it?>>> Another thing would be how it turns out in practice, how much more resin > youll need to wet out two layers vs. one, etc. The pros would know.>>> Two layers of cloth is supposed to be stronger then a single cloth at the > same weight. 2x4oz is even heavier the 6oz so I would assume you would > gain a considerable amount of strength.>>> regards,>>> Håvard Well Havard you've confirmed things for me. For almost any every day board except the super light performance stick, when you consider glass to resin ration, you get more bang for you buck and a much more strength with a double 4oz bottom layup with only a 20% weight gain in the lamination process. When you figure bottom lamination is only about 20% of the over all board weight you're only at a 4% overall weight gain. Down where the rubber meets the road it's a good idea to lay a solid tread tread to stand the test of time don't you think? Thanx for the math work buddy. Well done! Mahalo, Rich