Jump to content

Gavin Watson

MYA Member
  • Posts

    95
  • Joined

  • Last visited

  • Days Won

    1

Gavin Watson last won the day on September 2 2019

Gavin Watson had the most liked content!

Reputation

1 Neutral

1 Follower

About Gavin Watson

Personal Information

  • First Name
    Gavin
  • Last Name
    Watson

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. Michael, there is only one school of thought for a PG mast and that is a single hole in the front. The hole in the front still offers the same support athwartships as a hole in the each side however it does limit excessive fore and aft bend. The other thing to bear in mind that the weakest link in any alloy tube or cause of failure down the line will be due to holes in the mast tube and corrosion. The long and short being the less holes you drill in the tube the less likely there will be a failure. A single hole for the shrouds is the current status quo for the majority of the IOM class, BG's mast layout is the adopted norm now for most top skippers. http://www.bgsailsanddesign.com/toptips.html
  2. SoftSail It is normally quite easy to establish if a sail is soft without having to fold it and risk "damaging the ply". However, in cases of doubt, if it is claimed that the sail is soft, a measurer should fold the ply, usually in an area of secondary reinforcement. If the measurer is unable to flatten the ply when applying pressure between forefinger and thumb or the sail suffers damage more than a crease line, then the sail is not soft.
  3. As many of you will know, i'm not an active owner of either of the classes that this discussion could possibly affect. However, with over 24 years sailmaking experience and with a decent understanding of ERS from full size classes perhaps my thoughts might give an unbiased view from someone that does not have a commercial or financial interest in any outcome. 1 Do nothing, the good news here being that whilst some might think there is a loophole, no commercial supplier has tried to exploit this loophole. This either means that Commercial suppliers have not given any such loophole thought, have thought about it but decided that it is not in the spirit and intent of the rules or have tried it and been unconvinced by any benefit, all good stuff however once the seed has been planted with a loophole as in this case you can bet your bottom dollar that suppliers will try their upmost to gain an advantage, nothing new there, therefore moving forwards doing nothing is probably not an option. 2 Change The Class Rules to preserve the intent and spirit of the current class rules, This is exactly what should be happening, measuring thickness is commonplace in many full sized one design classes, is it difficult? No, bearing in mind measurer's for full size classes will be measuring ply thickness from light weight nylons, woven polyester & paneled laminates, i'd suggest measuring ply thickness for RC classes is going to be easier than full size classes, this would need to be worked in conjunction with Primary and secondary reinforcement size, with thought and discussion with commercial suppliers to find common ground as to current materials in use and a workable rule moving forwards. From my understanding after discussion with five RM measurers you require a PHD to navigate the RM measurement spreadsheets so measuring ply thickness should be a walk in the park. 3 Do what you (that is Robert Grubisa/IRSA TC) propose, If you follow Formula 1 i'd use this scenario as like using a new version of car, everybody hopes it has a beneficial affect, evens the playing field, makes measurement easier, better following, for fans etc.... The reality has always proven to be the polar opposite, one constructor gets it spot on whilst the rest of the field plays catch up! Graham mentions lifting restrictions would bring the RM in line with the 10r, funnily enough the use of full length battens in a 10r mainsail was not used as an example however seems commonplace on smaller rigs with a pocket luff, those full length battens are obviously there for a reason! Therefore it would be naive to suggest loosening the rules would have little affect on performance. In fact, if you were to use full length battens i'd suggest the sail body can be of lighter material(s) leading to obvious gains. Summary The loosening of class rules to allow full length battens or more battens will lead to development, unfortunately development will cost class skippers money, an arms race where there has been continuity. That would seem a complete nonsense to me where class rules can be changed to preserve the current intent.
  4. Michael, lets start with your prebend question. Could you get away with no prebend? possibly in a Zephyr, anything above that would simply not work. There would be insufficient tension on both the forestay and jib boom topping lift allowing the jib boom to rise uncontrollably, causing excessive weather helm, that won't be quick! I notice you are not a million miles from Catsails so i'd suggest that possibly the best course of action might be to contact Nigel and ask nicely if he could add prebend to a tube, when Covid restrictions allow. With regards Richards post, if you are using a genuine french PG mast and it is prebent correctly the prebend will not flatten off over time. Prebend will flatten out on the sails etc and similar tubes which are softer however they are easier to bend in the first instance! As mentioned it is tricky to add pre bend to PG tubes, they are not soft, therefore don't flatten out with age. If you venture to the top of a IOM fleet anywhere in the world, PG masts are used for a reason, if bent and built correctly they last a long time, they recover quickly from any side bend offering good gust response. With regards to Carbon spars, you can buy cheap carbon tubes however we all know that if the class were to move to Carbon we'd all end up using expensive high modulus sections. Many would argue that IOM's are expensive enough without adding high modulus carbon tubes to the list. Secondly, it wouldn't end at Carbon masts, all experienced IOM designers will design a boat around a set of parameters, mast stiffness will reflect hull design, foil design and placement and rig placement, IMHO to change to Carbon would completely open the floodgates to a generation of completely different hull designs, more cost. Finally, sails have to compliment the mast, a carbon mast will have very different bend characteristics, therefore the distribution of both luff curve and camber for the mainsail would change, the cut of the jib would also change as rig tension would be different. Unfortunately its never as easy as changing the material of the spars! There are some great tips and webinar videos updated most days at present on the BG sails and design website that i'm sure would be very useful for anyone looking to update rigs or update an older design. http://www.bgsailsanddesign.com/toptips.html
  5. Hi Ian, with regards to the Bantock method that will work with Sailsetc tubes which are softer than the French PG tubes. French tubes are best bent with a mast bending tool. Sailsetc now produce a full and short kit https://www.sailsetc2.com/index.php/products-a-spotlight/mast-bending-tool.html For those that have bent masts over the years they will know it's not as straight forward as it looks. Each tube will bend slightly differently this will very much depend on whether it was extruded at the beginning, middle or the end of the extrusion cycle. Therefore you would normally weigh the tube prior to bending to ascertain the amount of alloy content, a heavier tube would require slightly less bend to achieve the same results. The Long and short of this being that there is plenty to learn before you'll work out what works for you. If you are only bending a couple of rigs to replace masts i'd suggest you are best speaking with David Potter, or in the case of the Britpop, Robot Yachts or BG, it will save you money in the long term. If however you fancy learning a new art probably best to source plenty of PG tubes and start the learning experience. Please see image of my bending tool which is a modified Sails etc kit and works well.
  6. Bearing in mind the very close result at the IOMICA AGM of hull materials specifically around 3D printing Graham Elliott has started a thread on the IOMICA forum which can be found here: http://www.iomclass.org/phpBB3/viewtopic.php?f=4&t=1923 There is no doubt a willingness to embrace the latest technology, and the thread has been set up to look at the materials and the wording of the rules moving forwards with a rule change. If you have 3D printed a boat, have specific technical knowledge or just have an interest in the future of the IOM class, it's time to share your opinion.
  7. Full Statement from IOMICA VC Events Rob Walsh can be found, https://www.iomclass.org/blog/2020/04/29/2020-iom-european-championship-postponement/
  8. Change of ownership is undertaken by the class registrar. All registrar details can be found in the 2020 MYA yearbook pages 48-49 and in the MYA members area under officer contacts. I'm not sure about other classes but the IOM class registrar details are not listed on the GBR IOM website due to data protection of our registrar.
  9. Entry for our first ranking event of 2020 held over the 4th – 5th of April @ Datchet Water is now open. For those wishing to compete at the 2020 IOM European Championships in Italy later in the year, Datchet will be the final counting event to accrue enough ranking points to qualify. The latest ranking list can be found here All entry info including Notice of Race, online entry & up to date entry list can be found here As nearby accommodation can be costly due to the proximity to Heathrow airport it is advised to book early. Currently rates at the nearby Premier Inn here & Travelodge here are reasonable.
  10. Voting on the IOMICA AGM motions is now open. The agenda can be found here Guidance notes on the motions written by Graham Bantock can be found here The online voting form can be found here Voting will close Midnight 31/10/19. My thanks to Graham Bantock for compiling the guidance notes, Peter Stollery for additional guidance on item 7 (change to CCR’s) and the MYA DCO Austin Guerrier for creating and uploading the voting form.
  11. Entry for our final ranking events of 2019 are now open. Manor Park are pulling out all of the stops to provide a fantastic event with new ramp facilities, on site camping (on a first come first served basis see NOR) & Saturday evening class social. All details including online entry & Notice of race can be found here For those interested in competing at a European Championships in 2020 its possible that ranking 5&6 will be the last opportunity to accumulate ranking points. Please enter early to help the host club, we are expecting a large turnout so entering early might enable you to sail with your preferred number Please pay particular attention to personal buoyancy as prescribed in the NOR.
  12. Please note entry officially closes for the IOM Nationals on July 26th. After discussion with the club, entries will be taken after this date but a late entry fee applied, taking entry cost to £60. To all that are planning to join us, please ensure that you get an entry in ASAP, not only does it help Eastbourne prepare to give us the best time at the venue, but you will also save yourself a few hard earnt pounds!!
  13. If any GBR Skippers have interest in attending the 2019 IOM Worlds please make contact with MYA international Officer Phil Holliday via the MYA Contact form here Whilst the top twenty skippers have been contacted the likelihood being places being available. Further info can be found on the event website here
  14. Entry is now open for our first two Ranking events of 2019 @ Castle Semple hosted by Levenhall Radio Yacht Club. As always expect a friendly Scottish welcome and some great racing at the Castle Semple, Lochwinnoch venue. For anyone interested in attending the 2019 IOM World Championship @ Porto Alegre, Brazil, ranking 1&2 will be the final ranking events for qualification, so still time to improve on that ranking position and make the cut. Entry has been opened a little earlier for the reason that the Bowfield Hotel is fully booked so skippers are having to find alternative accommodation. There are a few options in the NOR and also plenty of accommodation can be found in nearby Paisley. The Notice of Race, Online Entry form and Entry list can be found https://gbriom.com/rankingraces/castlesemple/
×
×
  • Create New...