Hi all, I took delivery of a new fin range from K4 , the Incinerator. I have photographed them along with the scorchers. Both are 16cm and both sides are 8cm. On comparison the Incinerator has a lot less area, the tail is shorter and they are a lot stiffer. It'll be interesting to see if the smaller area provides enough lift or would I need 17cm Incinerator's to equal the early planing of the 16 Scorchers. I have been extremely pleased with the Scorchers on the water, however they were originally designed for a tri-fin setup whereby the Incinerator are purely for Quad boards. Time will tell how good they are. I'll keep you posted when I've had a chance to shred a few waves .
Cheers Rob

I was curious to see that they don't offer the fronts with any toe, that's one of the reasons I like K4s.

Where did you buy?

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JakeNN said..
Where did you buy?

4Boards on the south coast England, they accept Moona payment method, so if you sign up for a free 1 month trial it allow 5 pound discount on all purchases, if you order all separate , ie 1 centre plus 1 centre plus the sides it makes 75 pounds for full set delivered in the Uk. Not sure it there's a charge for postage for international shipping. Great value considering the performance offered.

Those fins are incredible. Unlimited hold in heavy sections but plenty loose when you want them. Not sure what makes them so good but I love them in all my boards

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RuaraidhK257 said..
Those fins are incredible. Unlimited hold in heavy sections but plenty loose when you want them. Not sure what makes them so good but I love them in all my boards

Are you talking about K4 in general or the Incinerator specifically?

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RuaraidhK257 said..
Those fins are incredible. Unlimited hold in heavy sections but plenty loose when you want them. Not sure what makes them so good but I love them in all my boards

I've been giving the design a bit of thought to the Incinerator design since I first compared them to the scorchers. The shorter tail coupled with the smaller area should make them nice on the turns , add in the extra stiffness which should help with early planing and speed. I discussed the Incinerator with Bob at 4Boards at length prior to purchasing. Apparently Adam Lewis had a lot of input with the design. I liked the fact that they have been developed specifically for Quad boards, not simply a traditional wave fin made smaller for the 4 fin setup. It stands to reason that if Quad boards need a different style of shape compared to tri or single fin hulls, then the fins need a re-design to get the best performance. Hopefully get some conditions soon to try them out.

I decided to give it a go with K4 fins for my goya customquads 2020 14 scorchers, 8 shark II. Coming from G10 (classic) and MFC RTM(stock fins),I was curious. The fins are awesome. The scorchers are 20-30g lighter each, and the shark II 10-15g which makes almost 100g lighter for the whole quad set, which is significant imho. In terms of stiffness, of course plastic cannot be as stiff as epoxy carbon but surprisingly this cannot be felt in the water. Grip, speed, planning, upwind,no deficiency whatsoever. Turning is boosted. There was wobbling in one of my rears which somehow disappeared. It would be nice if the heads of the fins are made a bit bulkier(to be sanded off if needed). Not the other way around.

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sprayblaze said..
I decided to give it a go with K4 fins for my goya customquads 2020 14 scorchers, 8 shark II. Coming from G10 (classic) and MFC RTM(stock fins),I was curious. The fins are awesome. The scorchers are 20-30g lighter each, and the shark II 10-15g which makes almost 100g lighter for the whole quad set, which is significant imho. In terms of stiffness, of course plastic cannot be as stiff as epoxy carbon but surprisingly this cannot be felt in the water. Grip, speed, planning, upwind,no deficiency whatsoever. Turning is boosted. There was wobbling in one of my rears which somehow disappeared. It would be nice if the heads of the fins are made a bit bulkier(to be sanded off if needed). Not the other way around.

H Sprayblaze, (great alias for a wave head)
I guess I've been lucky, all the K4's I've bought have either needed a bit of sanding or fitted perfectly . Plus I like the nuts on supplied with the US box fins, the safety feature allows the brass section to pull out if you should hit the fin. Good to hear that you like the scorchers, if the Incinerator's are better then they will be truly awesome

Goya boxes are on the loose side, I've had to sand all my K4s to fit others.

I tried the Scorcher on my Quatro and found it was a little too swept to work well on that board with it's super short US boxes. Put in a set of Leons and it was magic.

Currently playing with Stubby/Ezzy combo and really liking it.

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Rob0104 said..

sprayblaze said..
I decided to give it a go with K4 fins for my goya customquads 2020 14 scorchers, 8 shark II. Coming from G10 (classic) and MFC RTM(stock fins),I was curious. The fins are awesome. The scorchers are 20-30g lighter each, and the shark II 10-15g which makes almost 100g lighter for the whole quad set, which is significant imho. In terms of stiffness, of course plastic cannot be as stiff as epoxy carbon but surprisingly this cannot be felt in the water. Grip, speed, planning, upwind,no deficiency whatsoever. Turning is boosted. There was wobbling in one of my rears which somehow disappeared. It would be nice if the heads of the fins are made a bit bulkier(to be sanded off if needed). Not the other way around.

H Sprayblaze, (great alias for a wave head)
I guess I've been lucky, all the K4's I've bought have either needed a bit of sanding or fitted perfectly . Plus I like the nuts on supplied with the US box fins, the safety feature allows the brass section to pull out if you should hit the fin. Good to hear that you like the scorchers, if the Incinerator's are better then they will be truly awesome

Until the brass section looses grip on the plastic section and you can't get the screw to loosen with the fin in the board cos it is spinning inside the plastic section! Nice in theory only!

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sprocket said..

Rob0104 said..

sprayblaze said..
I decided to give it a go with K4 fins for my goya customquads 2020 14 scorchers, 8 shark II. Coming from G10 (classic) and MFC RTM(stock fins),I was curious. The fins are awesome. The scorchers are 20-30g lighter each, and the shark II 10-15g which makes almost 100g lighter for the whole quad set, which is significant imho. In terms of stiffness, of course plastic cannot be as stiff as epoxy carbon but surprisingly this cannot be felt in the water. Grip, speed, planning, upwind,no deficiency whatsoever. Turning is boosted. There was wobbling in one of my rears which somehow disappeared. It would be nice if the heads of the fins are made a bit bulkier(to be sanded off if needed). Not the other way around.

H Sprayblaze, (great alias for a wave head)
I guess I've been lucky, all the K4's I've bought have either needed a bit of sanding or fitted perfectly . Plus I like the nuts on supplied with the US box fins, the safety feature allows the brass section to pull out if you should hit the fin. Good to hear that you like the scorchers, if the Incinerator's are better then they will be truly awesome

Until the brass section looses grip on the plastic section and you can't get the screw to loosen with the fin in the board cos it is spinning inside the plastic section! Nice in theory only!

Haven't had that problem, although if the fin is tight in the board, sanding the head instead of over tightening the screw to try and force the fin in would cause such a problem. To date I've only seen this feature working once, needless to say the guy was delighted that it worked. Replacing the nut was a lot easier than potentially damaging the fin box and a broken fin head.

I've had a chance to try the incinerators in a variety of conditions. Initially I put 16cm centres with 8cm sides on my 106 Cube, they worked well however, due to the much smaller area of the centre fins I felt that a bit more was needed. I've settled on 17cm centres with 8cm sides on my 106, if I'm using a 5.7m sail I change to 9cm sides. On the 87L Cube, the 16cm centres with 8cm sides seem to cover the 3.7-5.0 well. Performance wise I am really pleased. Early planing, fast , grip on the bottom turn and really tight turn off the lip. Acceleration is fantastic. Overall K4 have come up with a really good Quad fin setup which is worth considering by anyone with a modern Quad wave board.

I recently got hold of a Lorch 103 Quad but the fins are tiny. It comes with 11cm outers and 16cm Rears but they are very thin on the base.

I have ordered some Leons in 18cm for light wind days.

Might use with smaller 9cm outers. I didn't realise that they went up to 18cm as the K4 site only says 16cm on their spec page or that they can be used as a quad but its what they have recommended so I'll go with their advice.

I am 90kg and sail in a place with strong side shore rips with a 5.7m sail and usually prefer slightly bigger fins.
I have used the board in powered up 5.6m conditions and still managed to spin out heaps so hopefully these will help.

Incinerators now available with toe and asymmetry.

Scored a mast high day at Magheroraty last week, was using my 106 Cube , 5.7 Banzai with 17 centres and 9cm sides, all K4 incinerators . The waves pictured had almost no wind on the wave face, but thankfully the setup preformed great.

K4 didn't recommend the incinerator for heavy guys but at 100kg they work awesome in my 99 cortex in good wind. K4s have changed all my boards for the best.

Hi all, the autumnal winds have finally kicked in here in Ireland after some 3 months of virtual doldrums. I've finally had a chance to try the one degree toe in thruster fins on both boards, the main difference is it's easier to get vertical going from the bottom turn into the lip, also a more surfy feel and easier aerial off the lip. For float and ride days I think bigger thrusters could be an option , possibly the 11 cm incinerators coupled with the 17 centres for a 105L or bigger board. Just for a bit faster release on the wave face. Cheers Rob