Recent content by Roy Berntsen

Well this is a sandwich configuration, so not so much. I was thinking non-woven had better mechanical properties than woven roving, but if they both are made of e-glass they would probably be similar in tensile/compression/stretch properties... How ever in a laminate non-woven would perform...

I wonder if there is a conversion rate to get from a roving to multiaxial stiched-biax in terms of weight or thickness. I have calculated scantlings for roving but want to use AMT. AMT should give similar properties with less weight/thickness Thanks for any help on this.

I am not sure about the performance. Calculations on a semi-displacement with a new hull design is kind of a blank paper. Not much theory on this subject that I can find atm. - Still searching though. I have doen some analysis in Orca but it does not handle multihulls well. Neither semi...

Thanks for the feedback. rxcomposite has a lot of good points and I am still investigating this subject myself. This is a semidisplacement power catamaran LOA 14M / WL 13M @ 8000-10000 kg. Speed should reach 40+ knots at max Material is Sandwich of E-glass, Iso Polyester Resin and PVC Core...

First of all thank you for responding mr Woods. I might have understated my knowledge in Naval Engineering. It is not that I do not have the education or hands on experience in this field. I do have a masters degree in Engineering Design with sandwich technology being one of the subjects...

I am designing a 13 m semidesplacement power offshore catamaran. I am to provide sandwich construction advice and need some input on fiber direction. In the hull sides it will be biaxial but which direction? +-45 or 0/90 and why? Direction in bulkheads, longitudals and transom if you have...

Hi all. I would like to brag about getting my design published in the biggest boatmag i Norway. Thanks for all the help through the way. http://www.batmagasinet.no/baatweb/cms.nsf/%28$All%29/DEB976CA1ACCD426C125789A0037200E?OpenDocument By xxdoctorxx at 2011-05-05

Hi. I am strugling finding good 360 hdr files for rendering my boat designs. If someone is sitting on links to nice images pleas post here. Thanks. Roy Berntsen www.royalazul.com

You do it part by part, not the entire area at once. Of course you should know the working window of your glue(vinylester). Anyways you typical start with one layer of ccm and you wet one of the 1/2 sides of V bottom. The wetted surfdace should be as long as the with of the fiber You cut the...

Thanks, i have used lots of time on this site trying to find what i am looking for but i dont find it wery helpfull i am sorry... I did find some usefull stuff in the cad block section :)

If you dont bother about my doings pleas scroll down to the question :) Hi. I just want to introduce myself to this forum. I have been building boats since 1992. How ever my last job was in sales and now i am going back to my love for boatbuilding as i am currently working on a masters...