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TimW

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Everything posted by TimW

  1. C Tech's phone number is 810-8406 we have some good carbon prod tubes for an Elliot 7.9 (we have done a few of them)
  2. TimW

    Beau 770

    BEAUDIBFUL
  3. TimW

    Venturi vacuum pumps?

    a Rotary Vane pump (which most single phase pumps will be) are oil cooled and require a pretty good vacuum before the oil starts to circulate properly. These pumps can overheat when evacuating large volumes of air from big bags. Its also true that a better vacuum (as close as possible to 1 bar) will produce the best results and result in the lowest void content in the laminate. The only time you back off on a vacuum is if you have a water cooled pump and the water starts to boil. Not also that autoclaving is an extension of vacuuming. An autoclave increases the pressure that the
  4. TimW

    Venturi vacuum pumps?

    Venturi's are a great way to take a lot of air out of the bag before you apply a proper vacuum pump to a job. As FNG says they require a lot of compressed air, as a guide a portable single phase "15' with 280 litres per minute free air delivery will not keep up with the air required on a fairly small job for more than a few hours. A vacuum cleaner is also a good way to evacuate air from the bag but will not pull an effective vacuum. How the long the vacuum needs to be on for basically has to do with the temperature of the epoxy. As epoxy starts to cure it creates heat. The vacuum mu
  5. TimW

    timberwolf

    New mast finished cooking and now ready for fit out and painting. There's not a lot of work to get the Wolf sailing again so anyone keen on doing this years Coastal Classic in their own ultra fast Trimaran should get in touch soon!
  6. TimW

    West 410 fairing

    A cost effective way to use Microballooons (407) is to blend with Microspheres (411) in a ratio of 2 parts 407 with 1 part 411. This gives a nice stable fairing product which is easy to sand and works out considerably cheaper than 407 on its own. I haven't used Microlight (410) for a long while now as it used to give us a lot of problems. Another trick using 407 or 411 when filling is to add a little aerosol (403) to the mix. This helps the edge of the filler stand up and reduces sagging. Sagging is a problem when the Epoxy cures , as it heats up the mix goes a little runnier, th
  7. TimW

    timberwolf

    Timberwolf's new mast is now Laminated and Ready to be cooked in the autoclave..
  8. TimW

    timberwolf

    Rory putting on 45 degree fill in strips
  9. TimW

    timberwolf

    Yes Timberwolf is definitely still for sale If anyone wants a quick boat very well capable of winning Division 7 in the Coastal Classic then this is the boat for you New rig offers even better light air performance.
  10. TimW

    timberwolf

    Finally some progress. New carbon mast section underway for Timberwolf Many thanks to Adrian Pawson for his help on getting me some of the Intermediate Modulus Fibre we are using
  11. TimW

    Carbon Head

    Yep KM is right I have taken a mould off a toilet and made a few Carbon ones off that a few years back along with a number of Carbon sinks. As a one off unfortunately some owners would start to cry. When I was fully tooled up and another order came along it would invariably not fit, and the mould would need modification. Since those days I think we could have a good go at it. Probably start with a cnc plug made from MDF because taking the mould straight off the existing bowl is quite time consuming and unfortunately the existing bowl gets wrecked and can't be re used. Happy to l
  12. TimW

    A Class Cats

    Great last few days. What's really great about the worlds. 1300 start!
  13. In the case of West System comparing Fast with Slow. A lot of people unaffected with slow or super slow are affected by fast. One difference is in the colour. Fast is a darkish brown Slow is a lighter yellow. Perhaps this is no longer true but the reason That Fast is darker is the presence of Phenol. Using the fast hardener creates an ectothermic more quickly that gives off nasty fumes Personally that sets my sinus off My understanding is that it may not be the ratio Of the hardener but rather the speed of the reaction. Slower systems like Catalyctic cure systems and
  14. TimW

    A Class Cats

    No racing again but extra races tomorrow So we get a series. Official website is the sailing events takapuna Listed above with updates to the Taka Facebook page also listed above. Good coverage also on Sail World and Cat Sailing News. After so much excitement in the lead up the past two days have been very dull
  15. One of NZ largest resin suppliers have recently changed Their mix ratio and removed Phenol from their Epoxy. This is to make a more user friendly product. If in your case you are specifically allergic to either Phenol or Amine or possibly it's the smell of the Combination that sets it off. It can be that what ever you reacted to 6 years ago was absorbed through your skin Even minor traces of your allergens might set it off again. You can get tested. I am fair skinned and had trouble with certain Paints and was badly affected by A30 resin ( which is no longer Made but
  16. TimW

    A Class Cats

    No racing today much too windy. Your result link above is correct
  17. It's actually really common to get sensitised to Epoxy and with some people it is as instant as it was with you. Working as a boat builder for the past 20 or more years I have seen around 4 guys who had to leave on their first day due to this and probably 10 or more affected in their first week. And over the course of many months it is more common again. Good news though is that it used to happen way worse than it does now and certainly direct contact is the major instigator but a few are just affected by the fumes ( this has only happened when confined in a very small space). The
  18. TimW

    A Class Cats

    Mine is the black one Bada Bing
  19. TimW

    A Class Cats

    80 A cats are racing at Takapuna. The full fleet won't assemble until 5th Feb as the reserve is needed for a triathlon. But all the overseas boats are at Taka now in the car park over the road. The NZ boats are spread between Team NZ base , devonport, wakstere and Milford.
  20. TimW

    A Class Cats

    It's a very exciting time in A cats. Every conceivable solution to foiling an A is in Auckland right now with flexi C, removable hull case cube to fit an L, boring J foils, canting cases,self aligning bearings to suit SJS foils. Rudders are some sort of derivative of either T or L and some with no wings. The foiling everyone does that I have seen is more like a lot of unloaded skimming and skipping clear and occasional bursts of lifting completely clear of the water. It isn't always the fastest way either in some conditions it can pay to sail a better vmg course especially if y
  21. Buying Plywood. I highly recommend Nicholls and Maher. They carry good stock and they seem to have the best price around in some cases by a good margin. Have used them at work for many years now.
  22. TimW

    Everdure or what??

    For what its worth. I too don't really like everdure for the reasons stated but I have always stuck with the same method given too me many years ago by Adhesive technologies as no one else has mentioned it. I use a 10-20% thinned epoxy coat first using #7 thinner. Allow about half hour minimum between coats then use Straight resin over the top of the still wet thinned coat. The ply will be almost as well sealed as two coats of straight resin which would be ideal, but this way you can put it on much faster. Its also pretty tough on the surface this way and reasonably smooth.
  23. No one can or should attempt to answer this sort of question on line. It is very complicated and there are a lot of variables involved. Smithy has just been through this exercise on Marshall Law and I guarantee he will tell you it turned out to be a much more expensive and difficult change than he initially considered ? Call me I am happy to discuss. Tim Willetts Hall Spars 021684582
  24. My Father Peter completed the design work for a 36' steel yacht in 1955. At the time it was designed as a Trans Tasman Racer and due to its steel construction it would get a favourable rating (at that time). Neither Albert (Trotter) nor Alexander William (Farmer) ever completed a Steel design and most of Trotters designs were for smaller boats up to 30'. During the 60's construction began on Peters design in Whangarei and if it was finally completed in 1976 that would probably tie in reasonably well as it was a drawn out process for one reason or another. In my Dads design era he
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