Evolution Omega Racing Kayak

Evolution Omega Racing Kayak

Imagine a (same speed) Coast to Coast paddle-time – with lower fuel-burn. Imagine that saved fuel being used-up during an amazing final cycle ride.

How does a Bulbous / Bifurcated / Bifid kayak bow function? Firstly consider that kayak paddlers have less finite power available than ships. As explained below.

  • Aerobic paddling can be sustained for as long as sufficient food is consumed. The hull drag at this paddling intensity is 100% related to the ‘wetted-area-drag’ of the hull. Aerobic paddling – up the anaerobic threshold – will be faster – if a bulbous / bifurcated /bifid bow is fitted. Providing greater ‘distance-made-good’ whilst the paddler can ‘back-off’ to conserve energy reserves. Due to the on-set of wave-making drag being delayed.
  • Anaerobic paddling can only be maintained for short periods of ‘sprint’ activity. The ultimate drag experienced is ‘wave-making drag’. There is NO claim that a bulbous / bifurcated / bifid bow can improve kayak sprint speed. The Inuit devised a clever stern design for that function. Forget it. The Inuit stern is NOT a valid design to use in wild rivers. And ICF Rules preclude that stern from all Sprint competition.

There are many theories. I believe Graham Eggar’s theory. The reduced ‘wash’ in ice flow ‘leads’ allowed for greater hunting stealth. The stern device facilitated an incredible sprint to the kill.

The Evolution Omega – Maybe the first production racing kayak with a bifid bow.

Over the last quarter century many other manufacturers have tried to make a better Coast to Coast race-winner kayak – than the Evolution / Classic / Edge / Extreme. Those who seem to have come closest seem to have ‘borrowed’ some of the Evolution Edge hull design.

Evolution Omega production run complete with unpaid Inuit ‘Royalties’ – for stealing their bifurcated bow invention

Some manufacturers talk about their boats being “freekin”fast. In actual fact, a Coast to Coast winner will NOT be paddling at the same heart-rate as he / she would wish. They NEVER push into the wave-making‘ drag-zone. They paddle firmly within the ‘wetted-area’ drag-zone. Over the years several heart rate studies have been independently conducted on Longest Day Coast to Coast competitors. Declining heart rate over the duration of the paddle – is normal.

We did some amazing tests in the Rangitata Diversion Race – using Luke Vaughan as a constant 160 hbpm (almost wave-making drag) or 130 hbpm (wetted-area drag) ‘motor’.

What is really required is a kayak that provides the greatest distance-made-good – for the lowest fuel burn. The very zone that bifid (bifurcated) bows enhance. Maybe in another 10 years ‘The Market’ will learn this fact.

Show me a modern ship without this feature. Show me a production kayak with this feature. Kayakers already know that ‘Wash-Hanging’ works. With a bulbous bow you hang-your-own-wash. Simple as that,

Ships achieve this by using technology first developed hundreds of years ago by the Inuit. I refer to ship bulbous bows. I refer to Inuit bifurcated (Bifid) kayak bows.

Sadly there are few photos – because the boats degraded before the research started

Like a ship – the Evolution kayak models are displacement vessels – when paddled at four-hour race intensity – aerobically.

This is Luke in the Evolution Edge – paddling the Rangitata Diversion Race – just 50 metres (over the fence) from the Sisson Kayaks factory.

Note the rolling stern waves following the Evolution Edge.
Note the pronounced bow wave.

The rolling Evolution Edge wake hitting the right hand shore

Evolution Edge wake up close

Change #1 was to adopt the Bifurcated (Bifid) Bow – a very clever invention of the ancient Inuit from the Bering Strait and East Greenland. Their craft (and amazing speed) was documented by Capt Waxell and Joseph Banks in the 1700’s.

Image from the Russians first meeting with ‘The Americans’

My initial Bifurcated Bow experiments were fitted to a Woodstock Express early prototype using Ian Ferguson as the ‘motor’ – on Nelson Harbour – paddling between the ships with their bulbous bows! Do you get the picture? The kayak and photos were lost in the 1996 factory fire.

Evolution Omega Bifurcated (Bifid) Bow

Change #2 was to lengthen an Edge hull 200mm BEHIND the cockpit – making it  very ‘bow-down’ on the water. The original testing prototype was created and tested  in 1995 – then destroyed in the factory fire in 1996. Testing conclusion – even better ‘run’ and more stable than the Edge.

Some would expect this new longer Omega hull to be wetter for the paddler. WRONG. The Bifurcated Bow acts as a shock absorber. As the bow slams down onto the next ‘green-water’ wave, the Acetal plastic rod exhibits downwards drag. The Evolution Omega is in fact the driest Evolution model on big wavetrains. But hey – this advantage is also reported by bulbous bow ships crews.

Extreme wave-piercing

Read more (second item from the top) here http://www.sissonkayaks.co.nz/blog/advice/frequently-asked-questions/

So – you may ask – is this new Evolution Omega faster? Multisport kayak performance is as much about ‘greater-distance-made-good-for-lower-fuel-burn’ as it is about ‘speed’. But hey – this advantage is also reported by bulbous bow ships crews.

Evolution Omega testing has taken place on the  Rangitata Diversion Race (RDR), just over the fence from our Methven factory. Luke Vaughan has compared his Edge to his Omega over many 700 metre runs at 130 HBPM and 160HBPM

Evolution Omega with bifid (bifurcated) bow
Note reduced bow and stern wakes

Evolution Omega
Hardly a footprint – in fact the paddle dips are almost the greatest disturbance.

Evolution Omega close up

Strangely my biggest marketing nightmare has been one that I did not anticipate. How to convince my Evolution Classic and Edge customers that their beloved kayaks were partly obsolete? Slowly they came to believe my predictions. They ordered Omega kayaks.

All Omega customers have reported better than expected stability. Some, including Gordon Walker have been able to set their seats higher in order to achieve better paddling dynamics.

All Omega customers have reported better “run” between paddle strokes.

All Omega customers have reported drier paddling through big water.

All Omega customers have reported shorter paddle times on known courses (speed – how I think that word is miss-used when kayaking is just one multisport segment of a potential hit-the-wall race).

Sisson Kayaks has experimented with Bifurcated (Bifid) Bows for many years. On this Esprit the bow wave moved closer to the hull. The paddle ‘catch’ happened earlier – on top of the bow wave instead of ‘inside’ the bow wave. Double advantage.

The Evolution Omega – paddled by Gordon Walker when he won the 2010 Speights Coast to Coast race – and set the fastest 2010 Longest Day paddle time. The Evolution Omega – paddled by Dougal Allan when he came a close second to Gordon. Gordon is a man of few words. “Awesome” will suffice.

Basil Pettigrew (left) Omega and Luke (right) Edge – at 130 heart beats per minute

Same photo enlarged. Surely you can see the difference!

And now – the science – a simulation – thanks to the computer work of the French naval architect, Marc RONET http://marc.ronet.free.fr/index_eng.html

The science matches the actual. Study the photo above again – closely. In this simulation the Baidarka has the Bifurcated (Bifid) bow.

From the website of Marc Ronet. Link to this project is here

“Kayak”, “Kajak” or “Baidarda”? Click here for an explanation.

Wow! Marc Ronet’s wonderful baidarda kayak kajak Iqyax project.

2018 Bulbous (Bifid) Bow Update

The Polynesians used this technology too…..

At the time I decided to try bulbous (inuit bifurcated) bows on kayaks, the ship designers knew it worked – but the science had not been resolved. In 2017 the science seems to be more advanced – whilst stating bluntly it will never work on a small pleasure craft like this:-

 

Note the ‘Rugby-Ball’ design stolen from a recently launched aircraft carrier bow

Results – From not believing the ‘small-boat’ science

  • Maximum speed  of 13.1 kph unchanged
  • Throttle back to 1/3 power-setting – the cruise speed is still 11 kph.
  • 7.5 kph at engine idle. Terrifying overspeed approaching jetties and moorings.
  • Improved straight-ahead course setting – zero wandering in any conditions. Rudder drag reduced.
  • Less ‘pitch-and-pound’ driving into big waves. Wetted-area drag reduced
  • Bow less likely to ‘blow away’ approaching jetties.
  • Huge fuel savings at  11.5 kph  cruise speed.
  • It works!

In retirement – having constructed zero Evolution Omega kayaks for many years (retired) – I have this to say. One day the ‘Kayak-Industry’ will ‘wake-up’. Bifid (Bifurcated) bows will be everywhere. They will have done their ‘research’. By reading (and copying) all of the above. From the Sisson Kayaks website.

Sheep

Predictable – based on actual history.

Posted in: Multisport Racing Kayaks

 

Contact Grahame

For all enquiries and orders please contact me directly:

Phone: 027 2755 499

Email: grahame@sissonkayaks.co.nz

Phone: 027 2755 499Email: grahame@sissonkayaks.co.nz

© 2018 Sisson Kayaks.