a better tiki 21

[Manfred.pech]

Slider would be a bit too small. Did you notice SLINGER ?? A 20 foot cruising catamaran - Page 2 http://forum.woodenboat.com/showthread.php?126136-A-20-foot-cruising-catamaran/page2

And a bigger version still foldable und trailable.

 

[redreuben]

The dashed line is a canvas canopy or so it says. ?

 

[Manfred.pech]

The dashed line is a canvas canopy or so it says. ?

Sorry, I do not know anything of a canopy on Slinger. Drawings of this design from Ray Aldridge are rare.

 

[redreuben]

Manfred.
Dashed line is for pirate and the Hawk plan

 

[guzzis3]

I'll have to see what cabin info is included with the Hawk plans (there is a dashed line included on a profile picture but who knows if they drew it up or are just implying you could do it if you want).

It would be easy enough to build the cabin but that boat is really a bit too small for a permanent cabin. Although it's 18' long there is a big overhang at the bow so it's probably really a 16' boat. Really nice though.

It is inevitable that boats get heavier by the square or cube root of the length because as they get longer they also get wider and higher. Gary Dierking's outriggers though only get longer, but they are not accommodation boats.

Knocking Hawke out to 21' would not require heavier ply, and simple scaling every length width and height by 20% should be straightforward. I'm actually tempted to write Selway Fisher and suggest a new design. The more I look at it the more impressed I am.

I would ditch the slatted bridgedeck though. Heavy and expensive. A tramp would be cheap light AND provide a comfy soft base for a tent pitched there. No camp mattress required.

I corresponded with Ray when he was developing slider, but have not heard from him in years. I may still have an email address somewhere.

See my previous comments regarding style. Personally I like them all but I get that some people are particularly attracted to the "piratical lines" of Wharramesque boats.

I really like Hawke, more than I want to.

 

[guzzis3]

Slider would be a bit too small. Did you notice SLINGER ??

And a bigger version still foldable und trailable.

Good work! I had not seen those! Gee people have been busy haven't they ?

These designs really address my origional question. There are boats out there I am not aware of and some of them are really interesting...

 

[Angélique]

— post #169 —
Manfred.
Dashed line is for pirate and the Hawk plan

I had to go back to the previous page to clear this up for myself, Pirate is [U]PirateDynamite[/U] and Hawk in post #163 and beyond is Selway Fisher's 18' Hawk, with a dashed line for a canvas canopy, so it's not about Ray Aldridge's Slinger...

— Selway Fisher 18' Hawk with dashed line for canvas canopy —

‘‘ . . . Built-in buoyancy, good storage and sit-in hulls which may, under a canvas canopy be used for sleeping as well as the bridge deck area making her an ideal coastal/beach camping boat. . . . ’’

— post #165 —
I'll have to see what cabin info is included with the Hawk plans (there is a dashed line included on a profile picture but who knows if they drew it up or are just implying you could do it if you want).

 

[redreuben]

Slinger; if memory serves Slinger never lived up to expectations, I believe Ray had a lot of trouble with rig/ helm balance and pretty much gave up on it ?
Happy to be wrong ?

 

[piratedynamite]

Personally I like them all but I get that some people are particularly attracted to the "piratical lines" of Wharramesque boats.

I really like Hawke, more than I want to.

I'm truthfully more attracted to the Gunboat look, but barring actual tyrannical piracy I'll have to settle for fiscal responsibility
The Hawk does look quite pretty to me as well. I don't know why but I'm partial to the planking used for the deck as opposed to the flat plywood sheets you see on a lot of the smaller Wharrams, and feel it may be better for me than a trampoline but only time will tell.

RedReuben, I could have sworn I saw him mention on some thread they he had to walk down one of the hulls and tore the 'stitch and glue' on one side. Maybe he decided a boat in the water is better than a project on land at that point and went sailing on Slider.

 

[guzzis3]

The 20' slinger looks to have the boards too far aft.

Slatted decks look good but I'm not sure they are very practical. Anyway easy enough to change, or not.

 

[Angélique]

The 20' slinger looks to have the boards too far aft.

Both Slinger drawings (19'8" and 23'4" × 12' in post #166) show a NACRA 5.2 rig, with an as per the original aft inclined mast, and the boards aft of the mast step.

— NACRA 5.2 —​

The outward angled boards drawn on both Slingers (19'8" and 23'4" × 12') give a down force on the leeward hull, so to do the opposite they look to me better placed on the outside hull sides.

 

[Angélique]

Does both rudders being drawn on the Slinger drawings (in post #166), but only one board is shown, mean they are meant to have only one board ?

 

[Manfred.pech]

Does both rudders being drawn on the Slinger drawings (in post #166), but only one board is shown, mean they are meant to have only one board ?

Ray Aldridge has the same arrangement on SLIDER: Only one board and a lot of rocker. In my opinion all these simple deep hulls would benefit from more beam at the bottom to develop more hydrodynamic lift in a squall. On the other side there is a gain in windward performance and one daggerboard might be enough.

 

[guzzis3]

This is obviously rough, scaling off the pictures above. The numbers below are the distance along the length of the hull of the mast then the board of the 2 sliders then the nacra.


0.5135135135 0.6486486486
0.5579710145 0.615942029
0.5 0.6111111111

So the masts are stepped approximately 51%, 56% and 50% from bow to stern. The center of the boards are about 65% 62% and 61% from the bow.

So the shorter slider has the mast at about the same proportion along the hull as the nacra but the board is about 5% further back.

could be wrong as I say it's a rough measurement.

 

[Angélique]

Guzzis, that's 2 × Slinger in post #166 (not Sliders), the nearly 16' Slider is in post #178, but I see what you mean...

— anyways, to avoid confusion, never give a bunch of designs nearly the same name ! —

After posting the NACRA 5.2 in post #176 I've looked back at the Sliders (edit: meant Slingers there) and indeed got the same impression for the small one.

But then I got hung up by both of them having only one outward angled board shown, which when on the lee side gives an undesirable downforce on the leeward hull, and when on the windward side gives an undesirable upward force on the windward hull, which also looks to be the case on the Slider.