Talk Composites - The Forum for Advanced Composites

Building a Javeiln Australia.

http://www.talkcomposites.com/Topic1570.aspx

By Rob Thomas - 5/6/2012 4:18:37 AM

I would like some advice on building a 14ft Javelin Sailing skiff.

I have looked on your web site and would like to ask the question on using Soric as a core material and your infusion system. I would like to build a new boat using your product but would like to know if this system is lighter than using standard high density foam.

I have asked llocal builder why they don’t use a infusion system and they tell me this is due to weight. Looking at the information on your site this may not be the case.

My current Javelin in a pre preg Carbon fibre boat and the construction of this is prefect how ever this needs to be done by a professional yacht builder due to the requirement of needing a oven large enough to put the boat in.

The current boat is very stiff the only other real issue I see with this building method is the boat can not take any impact. Currently all the boats are build using a high density foam these boats are racing boats and from time to time on the start line you will rub up against another boat all part of racing for this reason I am looking for another method of building a boat.

Could you give me some feedback on using Soric as a core material and using a infusion system to build a light weight strong boat.

We are currently looking at building the mould and I need to understand the lay up and the core material to proceed with this project. I have 20 weeks to complete this during the of season or Australian Perth winter I have sent a number of emails but no reply at this stage.

Any feedback from Easy Composites and members on the site would be welcomed

Best Regards

Rob
By dwlee - 10/13/2012 7:55:21 AM

Hi Rob,
This probably too late given that its almost the start of the season:-) Bungholio was built using a male mould and a similar layup with 2 layers of 200gram e-glass on the outside with a 10mm 80kg/m^3 herex PVC foam and 1 layer of 200gram glass on the inside. It has lasted very well and won the NZ nationals in 2010 at the age of 10 years. 

The compression dents and delamination are a function of the core compressive strength and the outer skin thickness and strength. For a javelin its very easy to make them stiff enough but harder to make them robust enough to impact. I would avoid using kevlar in the outside skin as it makes repair much more difficult, but it has been used successfully in javelins in the past and does improve the impact resistance.

 If you have any javelin questions ask on the javelin e-mail list see WWW.javelins.org

Dave Lee