Hi Rolf You appear to know exactly what you are doing and are working to a good plan which is the key. I have no experience in boat building so I'm not of much help but your blog is extremely good. To answer your first question I'm not planing on building a F16 but something a bit smaller to start off with. If I'm happy with the results then who knows!!!
For those interested, we just pulled the first strip plank hull half off the mould and did a quick weight calculation. I stepped on to our bathroom scales and got my base weight. I then picked up the hull half and we found the difference. Came out at 7.7Kgs. There are obviously several problems with this method to find the weight, but that is what we have got for now. Hull half is glassed on just one side with regular weave 200gsm glass but will now be sanded and glassed on the inside with 163gsm twill weave. We have learnt a lot from the process, so we fully expect the next half to be finished a lot faster with a better result.
So, if we say the finished hull half will weight in at 8.5Kgs that puts on a target weight of 26.5Kgs for the complete hull according to Marcus. Target should be 24Kgs to be close to min. weight, and I think we can achieve that. Phill and others have come up with some tips to further reduce weight which I dont think have been tried in other boats yet. Even with just one side glassed, the part was very stiff. It will be extremely interesting to see how this project turnes out or if we will have a huge pile of firewood once we sheet in <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />
I have been a naughty boy and forgotten to update you all on our project. I'll try to do better in the future.
We have not worked on the project during summer. Too many other projects and keeping the wife happy is important too. Now we are back at it. The building blog is still at: http://woodastic.blogspot.com/
I have two tips to share which was posted here recently during a debate about why homebuilding is important to a growing class. We have to be careful with the costs we incur on our boats, so we are always looking around for deals. Being able to use your own work as a way to get an affordable boat is a good way to help grow the class.
Tip 1: To get epoxy resin at a good price, dont buy in a store but do a phone session to industrial providers. If you have your own company you can easily score epoxy to 1/5th the price in a shop. We dont have a company, but were able to find an industrial provider who would sell us what we wanted anyway. The same providers often supply fillers, thickeners and fairing compound as well. Just make sure you know what you get so the epoxy is suitable for your project and your workshop. We found supplemental products to have a markup close to 20 times the cost price in shops!
Tip 2: If you need carbon fibers at a reasonable price, get to the phone and start calling carbon fiber weavers or manufacturers. We managed to buy 40kgs of carbon, at a very reasonable price compared to store prices. In fact the carbon and epoxy is so affordable that alu beams are much more expensive for us.
Some have called us nuts, so we had to find a way to block out the negative waves. The solution was obvious:
I am curious to know what you mean with "reasonable price" since I also found a good source for 1st choice 370 grs/sqm HS carbon cloth. For small quantities (1-5 Kgs) the quotation is EUR 20 per sqm or EUR 54 per Kg. Besides for very special INTERMEDIATE modulus they ask EUR 35 per sqm. I bought some of both
What do you get when you let the boys off to play with the chemistry set without supervision? You get a mess to clean up
Frode and Omar was to glue the rest of the bulkheads at frodes place last week. Turned out they had a small mix up when measuring the epoxy. It is suppsed to be 100 parts resin to 32 parts hardener. Suffice to say that 50 parts hardener to 16 grams resin dont promote a good result. Frode have to clean the parts, do some sanding and try again.
What did we learn? Mark the tins for resin and hardener with a big marker! I feel partly responsible as I did not mark or leave instructions on what was in the unmarked containers, but as the tins was very different, I knew what was in them.