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Thread: Voyages of Arawana

  1. #3186
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    Default Re: Voyages of Arawana

    good-oh!

  2. #3187
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    I made a quick phone call to the sailmaker and got an estimate to put two reef points into the new mainsail. It's within my expectations and budget. I'll be dropping the sail in to his loft some time soonish.

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  3. #3188
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    Trucking has been booked for the boomshakalakalaka.

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  4. #3189
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    Default Re: Voyages of Arawana

    Bruce what was the name of your mate that converted the TS16 to junk rig? I've been contacted by a bloke on the Gold Coast converting a Hartley 21 who is after info.
    My take is that if you poke someone with a sharp stick they'll get annoyed, if you smile and shake their hand they will be your friends.

    John Welsford

  5. #3190
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    Default Re: Voyages of Arawana

    His WBF login is goanywhere. If you PM him he should get an email notification.
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  6. #3191
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    Default Re: Voyages of Arawana

    Thanks Bruce.
    My take is that if you poke someone with a sharp stick they'll get annoyed, if you smile and shake their hand they will be your friends.

    John Welsford

  7. #3192
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    I've just become aware that there isn't any real consensus about how to sleep in a forward vee berth - head to bow or feet to bow. Pretty much all NA drawings show pillows on the berths, feet to bow. However it seems that some vee berths have the bow end slightly higher, making it a pain to sleep feet to bow if you suffer from reflux. It's also much easier for older crew to get in and out head ti bow. Arawana seems like it has enough shoulder room to sleep head to bow, so I'm going to see if that way works for us.

    Note that I'm no suggesting this for underway sleeping.

    Thoughts?

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  8. #3193
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    Default Re: Voyages of Arawana

    The bow is noisy, even at anchor.

    Rick

  9. #3194
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    Default Re: Voyages of Arawana

    I think I slept head forward at Robe and found it most comfortable. When sleeping with a partner I think shoulder, arm and elbow room might indicate sleeping feet forward. Although I seem to remember at least one seafaring couple I know saying that they found leg room more important. I think it's one of those things one can experiment with.

    On Balias double, which is quite small at its wide aft and even smaller at its narrow forward end, and therefore comparable to a v berth, we have our heads aft, at the wide end. At risk of over sharing, we tend to retire to seperate berths after play time.

  10. #3195
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    Default Re: Voyages of Arawana

    Arawana's new boom, at least the aluminium extrusion part, is trucking its way to us thanks to Frank! who very kindly took it to the trucking company in Melbourne for me. I'm very grateful.
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  11. #3196
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    How do you calculate the difference in elastic properties between 9.5mm od x 4mm id vs 4.5mm od x 2mm id rubber band tubing?



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  12. #3197
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    Quote Originally Posted by brucemoffatt View Post
    How do you calculate the difference in elastic properties between 9.5mm od x 4mm id vs 4.5mm od x 2mm id rubber band tubing?



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    Measure 1 metre of elastic, clamp it to a door frame or such with the free end of the metre hanging down.
    Fix a kilogram of something to the free end - flour, whatever - measure how much elongation you get per kg metre.
    Repeat with other piece.
    Compare.


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  13. #3198
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    Default Re: Voyages of Arawana

    Brilliant. And here I was thinking it was going to be something to do with the square root of the modulus of elasticity multiplied by the radius minus cosine something or other plus 3.

  14. #3199
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    Default Re: Voyages of Arawana

    Quote Originally Posted by Phil Y View Post
    Brilliant. And here I was thinking it was going to be something to do with the square root of the modulus of elasticity multiplied by the radius minus cosine something or other plus 3.
    That's two of us. Unfortunately I was remiss in specifying my question. I only have the thinner tubing so I can't do a quick physical comparison without buying the thicker stuff. If I buy the thicker stuff I won't need to do the comparison. I'll just use the thicker stuff. What I'm going to do, if anyone is interested, is some live tests using one, two, three then four parallel pieces of the thinner stuff.

    By the way it's for self steering, sheet to tiller, reaching.
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  15. #3200
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    It's a simple measure but limited - the more the elastic is stretched the less it stretches. For Bruce's purpose it should be OK as hell only have short lengths.


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  16. #3201
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    Default Re: Voyages of Arawana

    You would think the strength, resistance, elasticity, whatever, would be a direct function of the cross sectional area of the actual rubber. Two tubes would be twice as strong as one tube. So a thick tube, having twice the rubber of a thinner tube, would have twice the strength. If it's a rubber tube, then you can take your baseline from the thin tube. Work out the inside and outside diameters. Thhen work out the area of each circle thus described. Subtract the area of the ID circle from the area of the OD circle, and you have the cross sectional area of the tube wall. Then work out how to calculate the tube wall area of the unbought thicker tube. You need the OD and the ID. And extrapolate your strength, resistance, elasticity of your thinner tube to calculate that of your thicker tube.

  17. #3202
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    Default Re: Voyages of Arawana

    Quote Originally Posted by Phil Y View Post
    Brilliant. And here I was thinking it was going to be something to do with the square root of the modulus of elasticity multiplied by the radius minus cosine something or other plus 3.
    That reminds me of this..............it's a bit long but interesting
    If war is the answer........... it must be a profoundly stupid question

  18. #3203
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    Default Re: Voyages of Arawana

    It's probably a bit more complicated than I suggested above. As Chris says, the more you stretch it, the harder it gets to stretch it more. So if 1 kg hanging from your thin tube pulls it down, say 20cm, 2 kg probably won't pull it down 40cm. And 1 kg hanging off two lengths, will probably pull it down by a bit more than 10cm.

  19. #3204
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    Well after watching the string program I can only say that I understand my daughter the physicist more and my string and rubber bands less.

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  20. #3205
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    Default Re: Voyages of Arawana

    Quote Originally Posted by brucemoffatt View Post
    How do you calculate the difference in elastic properties between 9.5mm od x 4mm id vs 4.5mm od x 2mm id rubber band tubing?



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    I'd subtract the square of the inner diameter from the square of the outer diameter, for both pieces and compare the results.

    Edit, I see Phil suggested the same thing.

    I did the sums 9.5 squared -4 squared 74.25

    4.5 squared - 2 squared 16.25


    The thicker stuff is four and a half times stronger.
    Last edited by Hwyl; 10-17-2017 at 10:48 AM.

  21. #3206
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    Quote Originally Posted by Hwyl View Post
    I'd subtract the square of the inner diameter from the square of the outer diameter, for both pieces and compare the results.

    Edit, I see Phil suggested the same thing.

    I did the sums 9.5 squared -4 squared 74.25

    4.5 squared - 2 squared 16.25


    The thicker stuff is four and a half times stronger.
    Thanks. You have given me a starting point for my next self-steering trials. I've bought a few metres of the stuff pictured to make elastic bands from so I can add or remove bands in parallel, to finely adjust the strength of the line that counter balances 1. the natural weather helm (beating and shy reaching to beam reaching) and 2. the headsail sheet (broad reaching to running.)



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  22. #3207
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    Default Re: Voyages of Arawana

    Quote Originally Posted by Hallam View Post
    That reminds me of this..............it's a bit long but interesting
    It's also interesting that the video is simultaneously visible and invisible. I only noticed it while browsing the forum using Tapatalk on the phone. It's not visible via Firefox on Windows 10. Let's see if it appears in a quoted reply...

    ETA: Nope, not visible as part of quoted reply, but clearly there...
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  23. #3208
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    Default Re: Voyages of Arawana

    What video?

  24. #3209
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    Default Re: Voyages of Arawana

    Quote Originally Posted by Phil Y View Post
    What video?
    This was linked in #3205 but somehow not visible, except on my phone.

    https://vimeo.com/93401635
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  25. #3210
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    Default Re: Voyages of Arawana

    Quote Originally Posted by Hallam View Post
    That reminds me of this..............it's a bit long but interesting
    Oh, I thought he meant this thread!!

  26. #3211
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    Quote Originally Posted by Phil Y View Post
    Oh, I thought he meant this thread!!
    Certainly turned out longer than I'd thought it would be.

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  27. #3212
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    Default Re: Voyages of Arawana

    And certainly interesting.

  28. #3213
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    Default Re: Voyages of Arawana

    Quote Originally Posted by brucemoffatt View Post
    It's also interesting that the video is simultaneously visible and invisible. I only noticed it while browsing the forum using Tapatalk on the phone. It's not visible via Firefox on Windows 10. Let's see if it appears in a quoted reply...

    ETA: Nope, not visible as part of quoted reply, but clearly there...
    ........given the subject material it's probably on of those 11 dimension / parallel universe things.
    If war is the answer........... it must be a profoundly stupid question

  29. #3214
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    Default Re: Voyages of Arawana

    How long is a thread?

    Rick

  30. #3215
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    Default Re: Voyages of Arawana

    It has no length until you measure it - then it's infinitely long.

    A brief diversion. My mental condition is being treated with SSRI drugs. I recently changed from one type to another on the advice/recommendation of my treating doctor. One side effect seems to be the ability to focus the mind quite well, but for limited amounts of time. Last night for example I had a wave of insights about the nature of matter, energy and time, so I sent SMS messages to my daughter, who is a physicist. The more I focussed the clearer the nature of the universe became. Along the way I got a message back 'you have just transitioned from "old" quantum mechanics to "new" quantum mechnics.' The saddest thing this morning was finding the messages and not having a half a clue what they mean...
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  31. #3216
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    Default Re: Voyages of Arawana

    Ha Ha! Good one Rick!
    When I first noticed it not turn up on my iPhone I was going to post a link but didn't get a round to it.
    Then all this silliness started........
    If war is the answer........... it must be a profoundly stupid question

  32. #3217
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    Default Re: Voyages of Arawana

    Quote Originally Posted by brucemoffatt View Post
    It has no length until you measure it - then it's infinitely long.

    A brief diversion. My mental condition is being treated with SSRI drugs. I recently changed from one type to another on the advice/recommendation of my treating doctor. One side effect seems to be the ability to focus the mind quite well, but for limited amounts of time. Last night for example I had a wave of insights about the nature of matter, energy and time, so I sent SMS messages to my daughter, who is a physicist. The more I focussed the clearer the nature of the universe became. Along the way I got a message back 'you have just transitioned from "old" quantum mechanics to "new" quantum mechnics.' The saddest thing this morning was finding the messages and not having a half a clue what they mean...
    That must have been quite amazing, and in some respects even profound.
    If war is the answer........... it must be a profoundly stupid question

  33. #3218
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    Default Re: Voyages of Arawana

    Quote Originally Posted by Hallam View Post
    That must have been quite amazing, and in some respects even profound.
    I read somewhere that some medical scientists are suggesting that psilocybin might be useful as a treatment for depression, by effectively rebooting the brain. I was wondering last night whether perhaps some SSRI drugs might have side effects in common with psilocybin. Not that I'd personally know anything about such things as illicut psycho-active compounds, of course. My daughter says it has something to do with my uncut hair and the way the wind makes it stand on end. Apparently it's a physics thing.
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  34. #3219
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    Is time observable in discrete quanta? Is there an absolute unit of time?

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  35. #3220
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    Is time objective or subjective, and what does that mean in respect of the Uncertainty Principle? Can time be simultaneously objective and subjective?

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