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Design & Illustration

Panthera.2

Images | Particulars

Panther-2

Plans, Panthera.2 - 135 EUR Purchase

Panthera.2

Panthera.2 is a new double surfski-sea kayak hybrid – simply put a surfski with a kayak deck. But that would be an over-simplification. There is a small portion of sea kayak added to the mix, giving Panthera.2 slightly calmer movements in waves than an all-out competitive surfski. I expect the performance to be a tad less extreme than that of a thoroughbred surfski, but yet manageable should the paddler develop an acute desire to surf diagonally in high speed on large waves. I also expect a pair of competent paddlers to be able to keep Panthera.2 at speeds above hull speed á la surfskis off following seas.

Basically, Panthera.2 is so close to a genuine surfski that a rudder is needed to meet the potential (more about the difference here). An under-the-hull rudder with a surfski type of pedals is, of course, the best, but for fast touring, a rudder on the stern will do fine – preferably with one of the larger blades. With a full touring load, the kayak settles down to more directional stability for relaxed long-distance paddling.

The plans show the original Panthera.2 at 680 cm LOA, but two shorter options are indicated on the lines drawing; 646 cm and 629 cm.

No photos yet of a finished Panthera.2, but Luca Seganti in Italy is on his way:

Images

Panthera.2 – Luca Seganti

Particulars

Length¹ 680/672 cm (overall/WL)
Beam 59/55 cm (overall/WL)
Draft 12 cm
Cockpit¹ 80x40 cm
Height¹ 29.5/21 cm (in front of/behind the cockpit)
Weight² 20-25 kg
Displacement/volume⁶ 255 kg/600 litre
Speed³ 9.1/13.1 km/h
Prismatic coefficient 0.57
Wetted surface 3.1 m²
Drag⁴ 1.91/3.18 kp
Stability⁵ 3/4 (initial/secondary stability)
Intended use Fast touring, surfing, sea kayak racing

* These dimensions can be adapted to suit personal needs or wishes.
** Depending on type of wood, equipment, care with epoxy usage, sanding etc. etc.
*** The speed numbers are based on mathematical standard formulas (175 lb paddler + 30 lb carco weight) and corrected from the kayaks actual performance om trials, on tours and in races.
⁴ Calculated resistance in 4 and 5 knots (at nominal load capacity).
⁵ Initial stability and secondary stability on a subjective scale, where 1 is very tippy and 5 is very stable.
⁶ Displacement is kayak + paddler + load. Count off the kayak weight to get the load capacity.

Plans

The plan sheets contain the information needed to build the kayak/canoe. Station molds, stems and construction details are full scale. Recommended cockpit size is shown full size. The plans show 680 cm LOA, but two shorter options (646 and 629 cm) are indicated. Lines and construction drawings are in metric scale 1:10. Building manual available on the website.

The illustrated step-by-step building manual is in Swedish only, but it is available online in English: it covers all steps in detail and will guide first-time builders through the project.

Plans, Panthera.2 - 135 EUR Purchase

Comments

Have a nice day, I have to commend your work on the web and, obviously, on the designs of your vessels. Very interesant and inspiring. I built Auk 14 from Guilemont kayaks and this year two Chessapeek 17. Until a month ago I discovered your kayak designs. I want to build a Phanter 2 double-oak. In your speed table, you have a low travel and max speed compared to kayaks like Thule 2, Nomad 2, Alert 2. I think Panther 2 should be faster.Sorry, my English, but translated by Google.

You are quite right. The figures given are not Panthera's. They ended up there by mistake. I have corrected them now, from the latest hydrodynamical set of data: speed 9,9/14,9.

Then, of course, these kayaks are different and they perform better or worse in different conditions. Panthera.2 has an edge at surfing big waves and would leave a Nomad/2 far behind. But on more calm conditions the difference is small since Pantera.2 has more load capacity than Nomad/2 and thus increased drag.

This data is an indication of the potential, but can never be taken to exactly express the true performance of a kayak.

Hi Bjorn, where there is a Panthera 2 that I could paddle for a try ?

Hi François. Panthera.2 is a new addition to my catalog, and just a handful is yet ordered. I do not know if there is a finished Panthera.2 yet, but two of the builders accept contact with other builders: one in Sachsen, Germany, the other in Kiev, Ukraine.

Thanks for this informations. Can you message me the email for the builder in Germany. I plan to go in Sachsen some day as my son is living in Dresden, it 'd be nice if I can see a Panthera 2 there.

Send an email to me. I'll reply with the contact info.

The plans were purchased just three weeks ago, so I doubt you can see more than an initiated project.

Hi Bjorn,

I am getting my wife's Frej close to completion and planning my next project. We still paddle our Nomad/2 weekly but have need for a surfski double. I think a devolution of the Panthera/2 back to a surfski would be just the ticket. Specifically making a double surfski "cockpit" with the rudder being controlled by the larger paddler in the bow position.

I would like your thoughts and any help in placement and design of the paddlers seats, bow 6 ft and 220 lbs, stern 5' 4'' and 140 lbs.

Thanks for all your designs and support,

Kent

Hi Kent,

Your idea is quite right. Panthera.2 is, in essence, a stretched Spindrift, with two differences:

1. it is wider than Spindrift to provide a little more initial stability, which is often, but not always, needed (it is easier to handle low stability on your own than when exposed to another paddlers movements to stay upright), and

2. the deck is higher, very little in front of the cockpit, but approx 4 cm in the aft part (to provide more room for the touring duffel).

So, a surfski version of Panthera.2 would make a fine touring surfski double, but perhaps unnecessary wide for competitive use (fx 2 cm wider than an Epic V8 double and 10 cm wider than the V10 double).

I'll be happy to calculate the cockpit position for your given weights, Just give me your intended LOA (three options on the plans).

Hi Bjorn,

You have deduced our plans exactly. We will be competing in the Recreational Tandem Class (K2Rec) which is >22.1 inch and unlimited length. The Epic V8 Double 22.4in x 22ft is our closest competition. It is often found to be the best compromise between stablity and speed. A Race class double causing wasted energy staying upright which interferes with concentration on all power going to the stroke. This is especially true for rough conditions. Our Nomad/2 has been a wonderful boat at 750cm and 59.7cm as built. Our only stability issue is when having following seas which plant the bow and lift the stern rudder. Just the conditions for which the surfski was designed.

We will be building the 680 length boat with 220# paddler in the bow and 140 # stoker at the stern. This allows me to draft in competition without "looking through" the bow paddler or having to estimate the closing distance from 5 meters astern. Please let me know if this arrangement would be problematic.

Plans are purchased and no hurry.

Thanks

Kent

hi Björn, can the construction plans be sent by email in pdf or dwg format?

Yes

Hello Bjorn, I hope that all is well. I am getting a good start on my kayak decked Spindrift so it is time to start planning the next project. We currently have a wonderful touring double (Shearwater Double, 564cm x 63 cm) but are looking for something lighter/faster for day touring and recreational racing. The Panthera.2 looks like a good candidate, but I was wondering what the cockpit spacing is for the 646 cm boat? (Can't build the full length version because it will not fit in my garage.) I ask because one of the things that we love about the Shearwater is that the cockpits are spaced almost 200 cm apart allowing the two of us to paddle at our own cadence without fear of hitting paddles. Thanks

Hello Mark, The cockpits on the 646 cm version are 147 cm C/C apart, which I chose as a reasonable compromise between keeping weight as far as possible from the ends (sea-worthiness) and far enough apart to minimize paddle clashes.

But it is easy to adjust the distance as needed – symmetrically if you keep the cockpits positioned for approx the same weight in both, or asymmetrically if you balance that hull for different weights (in which case I'll be happy to assist with the calculations if needed).

I once built a too long boat in my short garage by nailing plywood on top of the opened doors and covering the extension with a tarp ;-)

Excellent, thanks Bjorn. I'll be ordering the plans in a couple of months. I'll touch base then for help with the cockpit placement.

Hello Bjorn. I have a Panthera on loan from John Abercrombie as I try it out. Fascinating. It is so different from the boats of my friends and kayaking mentors... they insisted that I put the rudder up when surfing and outlined scenarios (e.g. a following wave pushing the rudder to one side, making boat control impossible) that they felt would be problematic with the rudder down. I didn't know how to counter their arguments but missed the rudder when trying to make fast 180 degree turns between waves for example or making progress across the waves. I am too inexperienced with surfing to miss the rudder on waves. John was very clear that the rudder should stay down. Does the paddler keep their feet on the pedals and hold the rudder in place the whole time to prevent the above scenario? Are there resources, on line or books, that will help me learn how to paddle this very special boat? Are there other experienced individuals on Vancouver Island with this type of craft that I might take surfing lessons from? Thanks in advance...

Hello BJ, Panthera is special in that it in essence is a surfski with deck, and as such it balanced somewhat differently than ordinary sea kayaks.

The main difference is that a sea kayak hull tracks more or less efficiently – more of it is intended for rudder, that overcomes the tracking for turning, and if less, there is an adjustable skeg to improve the tracking when needed. In a reasonably maneuverable sea kayak, I also prefer to lift the rudder or pull up the skeg to have full control over that boat in big surf – hard work to steer during surfing but enough control to avoid a perhaps dangerous broaching.

A surfski on the other hand is balanced to have minimal tracking, and an efficient rudder system to control both the course and turning. This gives it maneuverability on wavefronts that a sea kayak can never match – and of course, it surfs with the rudder down at all times (compare with fighter planes of gen 5, that lacks stability I free flight and must be controlled by fly-by-wire and a computer – giving them unparalleled maneuverability).

But to be really efficient in big surf you should have an under-the-hull surfski rudder some two feet from the stern. Most Pantheras has been built with aft-hung rudders, which is fine for touring and in shallow waters, but such a rudder risk hanging above the water when surfing steep waves and thus occasionally of no use – but on the flip side, no particular risk either).

Talk to surfski paddlers for tips. I don't know much about the surfski circus on your side of the Atlantic, but the best youtube video I have seen is Oscar Chalupsky's (google "Oscar Chalupsky surfski clinic"). But apart from being more rudder-dependant than most sea kayaks, you paddle the Panthera just like any other kayak. It has though a potential that most sea kayak lacks and to take advantage of those, you need to practice surfing skills and competitive paddling techniques. But that is optional ;-)

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