Wharram Tangaroa Design Improvement Package

[Mynamessandy]

I have a Tangaroa MK1. I am going to be updating the beams to the tiki style beams. I have the design improvement package from Wharram. Does anyone have experience with making these beams? I have some questions about their construction.

Are the beams each 20ft long? Or each beam is different lengths?
I believe I am missing "panel dimensions sheet 2"

On the second page of the design improvement package do I follow these dimensions for the beam web parts? (I attached a photo for reference)

On the Tiki 38 sheet 4 plans there are drawings for crossbeams 1, 2, and 3, but not crossbeam 4. Is crossbeam 4 constructed the same as one of the other beams?

I hope my questions are understandable. Thank you for any advice!!

[boatman61]

I believe beam 4 on the Tiki 38 is an alloy tube the same dimension as the main mast.
Keeps the weight down..

[Mynamessandy]

From the plans I have it shows 4 beams and then the alloy tube.

[andres]

The Tiki 38 has only three beams and a "half beam" supporting the aft mast.

[contrail]

Maybe the best answer would come from Wharram? Or whoever distributes the plans and left the drawing out?

[Mementomori]

James Wharram unfortunately died a few months ago.

[Mementomori]

Also, you might have better luck answering your detail oriented questions on the Wharram Builders forum, I've looked at it and it seems somewhat active. If the question isn't being answered immediately, maybe getting in contact with someone who has done a build wouldn't be a terrible idea. There's probably a dozen people who could talk your ear off who solved your current problem, future problems etc. That seems like one of the biggest perks about wharram builds is the community.

[boatman61]

Hanneke Boon his designer is however still alive and kicking and the design team is still going strong.

[Manateeman]

Our first question is Why are you doing this “ improvement” ?
Try Boatdesign.net.
We remember an I beam but our recommendations seem too Industrial.
What are you trying to accomplish. It’s a rather old design and has been overtaken by technology. This was not a computer designed vessel.
Photos please or at least an more detailed explanation as to your aims...certainty it’s not to build exactly as some drawings indicates.
Several pertinent questions already asked. Please respond so we can assist.
Happy trails to you.
The manatee crew ( limited catamaran building experience)...but old and with some memory of these South Pacific DIY boats.

[Chotu]

Originally Posted by Manateeman

We remember an I beam but our recommendations seem too Industrial..

My ears are burning. Ha ha ha ha.

I have to say, these more simple catamarans seem very refreshing from a builder’s point of view.

I’ve always admired the Waharrams.

Are the plans in the picture blurry to everyone? Or just me?

[boatman61]

I've made the beams for a Tiki 21 however those dimensions are obviously going to be different.
Picture of one below.

[tevake118]

Yes, I agree: why are you making these "improvements"? I built a tangaroa mk 1 and sailed it across the North Sea, Atlantic, and Caribbean, lived on board for over 2 yrs with my wife. A great boat, tacked well, went to windward, and kept us safe.
. The Classic design is a very worthy vessel, using the 32 ( 4" angle iron/ threaded rod/ neoprene washers) flexible connections for the 4 laminated cross beams. Because the cross beams ride ON the deck, it is easy to keep rot under control, which isnt so with the Tiki lashings. I repaired a Tiki 26,so I know both designs. In my opinion, you would do better to keep the boat as is, and trade up to a Narai, with a longer waterline, and more room inside...Just saying...

[Redreuben]

The improvements packages are basically an upgrade for the classic designs to the more “modern” specs of the epoxy based Tiki designs.
Based around the Wingsail rig you can upgrade beams, lashings,deck pods, boarding ramps and outboard brackets.
These packages were demand driven from owners requests.
I looked at the 28’ Tanenui which is a classic design, the upgrade swaps out the cutter rig for the Wingsail sloop off the Tiki 30’ and the Tiki beams give you another 3’ of beam.
They are definite improvements.