composite

Good Day everyone, My name is Tonja Jiran and I'm the surviving daughter of Manfred Jiran. Fred was in the process of building a composite catamaran named "This is it" when he passed October of 2024. I'm here for a few reasons and hoping someone might be able to lead me in the right direction...

Hi all, New here! :cool: I'm looking for a list of reputable GRP/Composite Boat manufacturers based in South East Asia who either manufacture and sell their own boats or act as 3rd party producers for other brands/government contracts ect I know there are a lot of producers but if anyone has...

Hi All, I'm an engineer at a company where we produce offroad expedition vehicles. We are vacuum infusing our fibreglass parts, but we are having issues with dimpling in the finish of the part which requires finishing after pulling the part. Our layup is as follows: - Spray Gelcoat. - Back up...

Hi Everyone, I would like to present the tool that I've developped, to assess ISO compliancy of monohull & multihulls, with the ISO12215 standard. 12215 ALIVE ! is a powerfull web app for assessment of Small Crafts with the standard ISO-12215 Design & Scantlings. The standard is translated...

Hi all, I want to extend an existing small mold (it is a kayak rim) about 2cm on a specific area as outlined with the red marks in the attached image. I'm looking for opinions about the recommended way to achieve this. The mold is about 9mm thick made with gelcoat and chopped mat and polyester...

Hello Boatdesign.net-ers! To warm up weekend atmosphere a bit I am starting discussion on framing system in small composite pleasure boats. I did quite a research in several books and articles published around, and I am very interested in your opinion, experience and comments on this topic...

Hello all, from past projects we have some remanent composite material that may be of interest to this forum. I'm posting here what we have available. If anyone is interested donn't hesitate to contact me. - Core-cell P500 (1065mm x 2185mm) in 30, 25, and 15 mm thickness - T700 Unidirectional...

Hello folks, new to the forum. I'm sure it's been covered but I'm interested in the possibility of taking two GRP 30ft life boats, slicing them up into 1 hull. Have people tried similar things, obviously there are major structural considerations, buoyonancy and weight distribution at play...

Dear everyone, Recently I got a bit stuck with one structural design problem. It is how to properly design nad analyse transom that carries 2 x sterdrives (engines 2 x 450 HP). It is clear what kind of forces and moments act on transom, but it still remains open how to analyse this problem...

Hi guys I am restoring a camper box for a unimog truck and I thought this place would be best to ask for advice as it uses a lot of the same materials as many boats. The plywood on the inside that is stuck to the foam is pretty much fused together and I found it very difficult to ply off...

Hey guys, I am the owner of a new jon boat. I am planning on putting in a floor over the ribs. The ribs are 2” wide and they are on 14” centers. This is a non structural part of the hull, it just needs to support the weight of people/coolers etc... Can you guys give me a starting point on what...

Anyone ever consider using 1" xps (extruded polystyrene) for cockpit panel? I don't know how to do any of the calcs, so wondering what the skins would be... The panels are 4x8; need 4. Designer hasn't specified anything yet. It is just meant to be a fun question. Since I am using corecell...

Hello everyone, I am designing a pair of composite davits and i am looking for some validation on the design. The davits are intended to carry the following weights -Dinghy (empty) = 77 Kg -Engine (15 HP) = 59 Kg -Fuel tank = 21 Kg This gave me a total of 157 Kg. To this I added the...

Hello everyone I am designing a composite bowsprit and had a few questions. As a brief problem statement: the bowsprit will have a variable cross section, starting as a C section and switching to an M section (more or less). As I was not able to determine the loads acting on the tack, because...

I have been rethinking my design/build process for a small cruising sailing catamaran. I have received a lot of good advice here on boatdesign.net, and because of this I am now moving in a new direction. I am building a one-off composite boat, and I am not going to build a full production mold...

Hi All, it was recommended that I re-post a question I had here. It's a question about methods, so not totally clear where it should go. The original post is here: vacuum bagging variation for composite construction...

I plan to use epoxy resin to vacuum infuse a part in a wooden female mold. In order to ensure there are no issues with demolding I was considering applying a polyurethane coating to the wooden mold to seal it prior to the application of any release coatings (the product I'm considering is from...