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  1. #226
    Join Date
    Oct 2014
    Location
    Cape Town
    Posts
    9

    Default In Perspective Bllackburn challenge

    The Balckburn challenge is 20 mile and the 13 . 1st band 2nd were guide boats in hour 4, 44, and 4 hour , then came Annapolis wherry in 4.13 . I think the numbers are about right.
    so the Annapolis wherry averaged 4- mph

    So ll this elderly unft enthusiastic dude has do , is get a bit fittend he will not disgrace himself.

    Boats looking good and seems to b delivering what you want
    Well done

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  3. #227
    Join Date
    Sep 2012
    Location
    NSW, Australia
    Posts
    474

    Default

    No, the latest Blackburn times are a lot faster than that. Close to 3 hours, from memory. Average speed around 5.5 knots. I know this because Clint and I and several others were discussing that race in some detail over at boatdesign.

    And I'm not elderly yet (but I'm working on it).

    Anyway today's time was an even 20 minutes, or 1 m 45 s slower than the other day. This was because of a headwind most of the way, averaging Force 2-3 but gusting 4-5 at times. When I rounded a point and got hit by the stronger gusts I had to stop rowing for a moment, grab my hat, and stuff it under my knees before it flew off down the dam. I figure, under the circumstances, today's slower time is ok.
    You know you're making progress when there's sawdust in your coffee.

  4. #228
    Join Date
    Sep 2012
    Location
    NSW, Australia
    Posts
    474

    Default

    Here you go: 3 hours 12 minutes. Exactly 17 nautical miles for the Blackburn, so average speed was 5.3 knots.
    You know you're making progress when there's sawdust in your coffee.

  5. #229
    Join Date
    Sep 2012
    Location
    NSW, Australia
    Posts
    474

    Default

    Ok, so perfect conditions today. No breeze to speak of, and my hat was quite happy staying on top of my head. Time was down to 17m 40s, and average speed up to 4.9 knots (5.6 mph). I'm happy about that.

    Current goal is to be into the 16's by New Year (or early in the new year, if conditions for the rest of this year turn out to be such that hat will be trying to abscond).
    You know you're making progress when there's sawdust in your coffee.

  6. #230
    Join Date
    Oct 2014
    Location
    Cape Town
    Posts
    9

    Default Not too shabby

    Not so shabby, and if you get down to the 16's in the new year, and work on developing a bit of stamina,
    we expect gr8 things .
    Have a wonderful chrismas and new year if we don't hear from you.
    Mike

  7. #231
    Join Date
    May 2011
    Location
    Kempsey NSW
    Posts
    24

    Default

    Quote Originally Posted by Sumbloak View Post
    Turns out that in a tube that small, the surface tension against the walls is such that the level is inaccurate. I thought it'd be big enough, but it aint. It can easily be out by over a millimetre either way. That's too much for my liking. So, off to buy some bigger tubing. Meh.

    I'll make the next one oversized.

    ETA: Got 12mm ID tube. That works. Wouldn't go smaller than that in future.
    Yeah, this is true. We old chippies used to use 3/4" garden hose [cheaper!!] for longer runs, like levelling houses etc, and then just a foot or so of clear plastic washing machine drain hose (or whatever) at the ends where you need to see the water level.

    Cuppla carved wooden plugs for the ends and Robert's your mother's brother....

  8. #232
    Join Date
    Sep 2012
    Location
    NSW, Australia
    Posts
    474

    Default

    I should have thought of that. I already had a perfectly good garden hose. Thanks for the tip.

    And for Mike1: I still haven't done any racing as such. Yes, I know. Slack.
    You know you're making progress when there's sawdust in your coffee.

  9. #233
    Join Date
    Sep 2012
    Location
    NSW, Australia
    Posts
    474

    Default

    By the way, I have had a chance to row the boat a fair bit under a range of conditions. The general behaviour is pretty good, but not quite as good as I would like. I'm already considering possibilities for the next boat. Not that I'll be building another one soon as I have too many other things to do, but a new build may be on the cards in another year or so.

    Stability isn't a problem as it has heaps of that and could easily afford to lose some. The main problem for general use is lack of lateral resistance. This is not a problem in calm conditions or in a light breeze, but can be a real nuisance when the wind gets up a bit. It's down to this being a lightweight boat with a long waterline, combined with a midship section designed for a fair degree of stability. The result is not much draft at all, and a shallow and rounded immersed midship section. This aint good for grip on the water. For a boat to be used under pretty much any conditions whenever I feel like a row, I'd definitely prefer substantially more lateral resistance and directional stability.

    What I've been considering is reducing the beam at the waterline to allow more draft without increased wetted surface. This is pretty much the only way to get the desired result. At the moment I'm not sure if I'd go for a very narrow flat bottom (a la guideboat) or for deadrise all the way through. In terms of resistance it doesn't matter much. In terms of practicality for beaching the narrow flat bottom would be better, but deadrise all the way through would probably provide better grip. OTOH, if the narrow flat bottom can be made to provide enough grip I'd probably go with that.
    You know you're making progress when there's sawdust in your coffee.

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