Sportsboard structures
a technology for sports boards and body boards, applied in the field of sports boards, can solve the problems of inability to resist impact, inability to make the body board very rigid, and inability to help the rider in directing the board
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example 1
[0291]This example demonstrates the superior flexibility of surfboards made according to the invention.
[0292]Test Apparatus
[0293]Testing was conducted on an Emerson 8510 compression tester, (Emerson Apparatus Company, Inc., Portland, Me.), designed in accordance with the requirements of ASTM D642 and TAPPI T804 equipment specifications. The programmable platen was set at a rate of 0.5 inches (1.27 cm) per minute. The fixture used was a modified design of the general test protocol for alpine skis, a three point bending test to ASTM Standard 780-93a.
[0294]Each surfboard was placed on the fixture, which was installed under the Emerson apparatus aligned to the same center point. The base of each surfboard was supported by a 1.5″ diameter free floating steel rod so as to not apply any friction to the base of the board as it was being deflected from the top. The spacing between the bottom rails is 28 inches and the selection of the spacing was determined through findings of the major comp...
example 2
[0303]This example demonstrates the superior flexibility of surfboards made according to the invention. The test apparatus described in Example 1 was also used in this Example.
[0304]Sample Description
[0305]The sample surfboards were similar to those shown in FIGS. 31 and 32, approximately 70 inches (178 cm) long. The blanks for each sample were molded, and cut in half lengthwise and a wooden stringer attached to each half with an adhesive. The blanks were glassed using an epoxy laminate. All ingredients and construction were identical except for the foam material for the blanks, which were as follows:[0306]Sample 3: 2.5 lb / ft3 (40 kg / m3) density expanded polystyrene[0307]Sample 4: 2.5 lb / ft3 (40 kg / m3) density expanded ARCEL® 730 resin
[0308]Each surfboard was placed on the test apparatus and the platen was lowered until a break in the stress-strain curve indicated a failure. Sample 3 indicated a failure at 0.71 inches (1.8 cm) and sample 4 at 0.85 inches (2.2 cm) of deflection.
[0309...
example 3
[0311]This example demonstrates the effect of laminate on the flexibility of surfboards made according to the invention. The test apparatus described in Example 1 was also used in this Example.
[0312]The sample surfboards were similar to those shown in FIGS. 31 and 32, approximately 70 inches (178 cm) long. The blanks for each sample were molded, and cut in half lengthwise and a wooden stringer attached to each half with an adhesive. The foam used for the blanks was 2.5 lb / ft3 (40 kg / m3) density expanded ARCEL® 730 resin. All ingredients and construction were identical except for the laminate resin used to glass the blanks, which were as follows:[0313]Sample 5: blank glassed using an epoxy laminate[0314]Sample 6: blank glassed using a polyester laminate
[0315]Each surfboard was placed on the test apparatus and the platen was lowered at a rate of 0.5 inches (1.27 cm) per minute to a deflection of 1 inch (2.54 cm). The deflection and load where a break in the stress-strain curve was not...
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