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Thread: Voyages of Arawana

  1. #3606
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    Oar deployed vs oar raised.

    It's a work of art. It's a veritable Leonardo da Vinci original. I am seriously enamoured of this device.





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  2. #3607
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    Default Re: Voyages of Arawana

    Excellent. A Super Navik clone ( see page 131 of the Windpilot book ).
    You will be mesmerized by its efficiency . Some NACA OO magic on the oar might make it even better.
    Last edited by Neil C; 03-04-2018 at 02:52 PM.

  3. #3608
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    Quote Originally Posted by Neil C View Post
    Excellent. A Super Navik clone ( see page 131 of the Windpilot book ).
    You will be mesmerized by its efficiency . Some NACA OO magic on the oar might make it even better.
    Hi Neil. I was hoping you'd comment soon. As usual, good info, and very welcome. A mate over here saw the photos and said it is a Navik. It does look like a home built, but very well built.

    I got it from a Kiwi couple who own a Piver tri and a Contessa. The lovely lady complimented me on my new thongs (jandals) and assured me I need not have dressed up for the occasion. My kind of person. The bloke works shift work and I didn't meet him, more is the pity. A Maori man, and no doubt with stories I'd love to hear.

    I read in a Navik manual that their oars are profiled to NACA 0012. I don't suppose you know whether that's the profile that would best suit this???

    I have lots of other work this week but one way or another I'll get this out for a trial fitting on Arawana.

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  4. #3609
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    The wind vane as-is weighs 38.8 kg. With two additional struts, plus bolts and strings, it should come in around 45. If it proves to be too tall in the mast it may come down to around 35. Good job I have some adjustable ballast.

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  5. #3610
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    Default Re: Voyages of Arawana

    I don't see how it could be much good if it steered the Maoris from NZ to Iron Knob!

    Rick

  6. #3611
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    It's just a machine. The Maoris wanted to go to Iron Knob. I'm not really game to ask why they wanted to go there. All I know is that there are boats in yards, streets, vacant lots and verges there everywhere. There seems to be some kind of strange nautical magnetism in play...

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  7. #3612
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    A new 70w solar panel to go on Arawana's sliding hatch. It is also for Romana's foredeck. On Arawana it will be used in conjunction with a 50w fixed panel. The 50w panel will be permanently attached somewhere aft and the flexible panel will be brought on from Romana, for Arawana's voyages. Arawana's new panel and power controller should be here next week so more details to come.



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  8. #3613
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    Default Re: Voyages of Arawana

    An interesting angle on the nautical propensity of the folks at Iron Knob.

    The Bill Belcher DIY gear has a 125mm chord with an oar thickness tapering from 35mm at the top to 17.5mm at the lower end. I guess this means an average of about NACA0013. The main thing to ensure is that oar has about 22% balance , any more will make it unstable. The oar should be immersed 600mm. With the boat in trim make sure the gear is mounted so the oar is vertical or even angled a few degrees aft.
    The height of the vane above the stern rail shouldn't be a problem, clearer air higher up.

    A few cartons of Coopers under the front bunk should solve any trim issues.

  9. #3614
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    Default Re: Voyages of Arawana

    Not for long

  10. #3615
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    Quote Originally Posted by Phil Y View Post
    Not for long
    After the first six pack it's all seemingly uphill.

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  11. #3616
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    Default Re: Voyages of Arawana

    That's just because the bow is a little higher. Although for me it's the other way around. After a six pack of anything things go rapidly down hill.

  12. #3617
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    It's too big (as the actress...)

    The longitudinals are too long and will need to be shortened, placing the boom inside the pushpit rail.

    The oar shaft is too long and will need to be shortened by a good 200 mm.

    The vane paddle mast is about the right height above the aft deck.

    Alternatively, it's just too big for this boat.












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    Last edited by brucemoffatt; 03-06-2018 at 01:25 AM.
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  13. #3618
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    It may perhaps be possible to mount it on the small aft deck with the wheel overhanging the transom











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  14. #3619
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    Default Re: Voyages of Arawana

    Bruce, Mounting on the aft deck on some wooden packer blocks should work.
    With the mast on the forward side of the pushpit rail , reposition the 2 diagonal braces to the front or do away with them and clamp the mast to the pp rail. You need a loop of string from the base of the counter weight to the mast to restrict the vane movement to about 45 degrees each way . Most commercial gears have a stop to limit the vane swing.
    May have to spread the base of the pp legs apart a few mm to allow the frame through.
    Last edited by Neil C; 03-06-2018 at 02:28 AM.

  15. #3620
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    Default Re: Voyages of Arawana

    That's going to need a lot of beer up front.

  16. #3621
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    Default Re: Voyages of Arawana

    She's a big 'un alright!

    Rick

  17. #3622
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    Default Re: Voyages of Arawana

    Quote Originally Posted by Neil C View Post
    Excellent. A Super Navik clone ( see page 131 of the Windpilot book ).
    You will be mesmerized by its efficiency . Some NACA OO magic on the oar might make it even better.
    The Navik derived much of its power from having a trim tab attached to its relatively small rudder, the pendulum rudder and turret look like modified Navik parts. One of the main selling points with the Navik was its low price and light weight which made it suitable for smaller vessels.
    I have been actively looking out for another one for WB.

  18. #3623
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    Default Re: Voyages of Arawana

    Quote Originally Posted by RFNK View Post
    She's a big 'un alright!

    Rick
    It most certainly is.
    The definition of stupid has got to be the belief that more guns will negate the bloodshed done with guns.

  19. #3624
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    Default Re: Voyages of Arawana

    We got the boat cover back on today. I'm trialing 15mm uPvc water pipe spreaders. We've started planning the electrical overhaul as the next major system upgrade, with continuing to refurb things like the bilge pumps, some mast lighting, VHF base station. I've also decided I'm not going to make a stack pack after all, but will install lazyjacks.
    When I first joined WBF they made me write a book to prove I was a real yachty. I was so gullible.
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  20. #3625
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    Default Re: Voyages of Arawana

    Lazy jacks are good, and a stack pack may well be overkill. More useful on a big thing like mine where just getting the sail cover on and off can be a bit of a bugger in itself.

  21. #3626
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    That’s what I’m thinking.


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  22. #3627
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    Guess who has an iPhone now it’s me


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  23. #3628
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    Default Re: Voyages of Arawana

    Now you will have to try to remember to write everything thing out in full and to speak of things like the dinghy of Arawana, rather than Arawana's dinghy.

  24. #3629
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    Default Voyages of Arawana

    It's ok. It works now.


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    Last edited by brucemoffatt; 03-16-2018 at 06:24 AM.
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  25. #3630
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    This is driving me crazy. It's very odd.


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  26. #3631
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    Default Voyages of Arawana

    Quote Originally Posted by Phil Y View Post
    Now you will have to try to remember to write everything thing out in full and to speak of things like the dinghy of Arawana, rather than Arawana's dinghy.


    The dinghy of Arawana is Arawana's dinghy.


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    Last edited by brucemoffatt; 03-16-2018 at 06:30 AM.
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  27. #3632
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    Default Re: Voyages of Arawana

    How did you so that?

  28. #3633
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    Quote Originally Posted by Phil Y View Post
    How did you so that?


    Go to Settings- General- Keyboard and deselect Smart Punctuation

    You're welcome


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  29. #3634
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    Default Re: Voyages of Arawana

    Just so it.

    Rick

  30. #3635
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    It's dine. Thamks. I also turbef ogg autocorredt.


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  31. #3636
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    Oh gob, turd it bag ob


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  32. #3637
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    Default Re: Voyages of Arawana

    Almost lost a mouthful of coffee. I crack myself up enough, and your response pretty much did me in.

  33. #3638
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    Default Re: Voyages of Arawana

    I'm putting it down to election excitement.

    Rick

  34. #3639
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    Tool jumble sale at our booth. That was exciting. $25 already with metal cutting blade. Roofing iron arrives Tuesday.



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  35. #3640
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    Reading, reading and re-reading Belcher on self-steering. I'm not going to make a decision yet, but it looks possible that the way forward will include trying to refine sheet to tiller and rubber band lashed tiller techniques, then building a simple wooden wind vane along the lines of Belcher's OGT - vane direct to tiller - to supplement lashed tiller, and possibly using the OGT vane with a pendulum oar if none of the earlier steps prove to be acceptable. Bite size chunks with no dead ends, apart from selling the Super Navik clone system that is too big for the boat.


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