Gumotex Rush (D-SF)
Gumotex are moving on up with hybrid drop-stitch technology, originally showcased in 2019’s Thaya which is basically an old Solar 3 with a D-S floor to make it more stiff. The new-for-2020 Rush 1 and 2 (left) is the ‘Swing Evo’ mentioned in that Thaya article.
The new Rush models came out in April 2020, just as the pandemic hit and lockdowns/shutdowns spread across the world. It’s also said there was some kind of quality control calamity at the Gumotex factory which led to many completed boats getting shredded. As a result, stock of Gumotex IKs dried up over the summer at the same tim as post-lockdown IK demand went ballistic RTW.
Other IKs came back online but the Rush was put right to the back of the queue and is due back in stock from February 2021 by which time all Gumotex boats got a price hike. The R2 will now be €1500.
‘Hybrid’ is a cool word for a kayak which isn’t a Full D-S like a Sea Eagle Razorlite and many others. They’re assembled from three flat drop-stitch panels making boxy hulls (right) which, according to the graphics on this page, may be sub-optimal in choppy waters. Me, I think a full-width flat floor is as much to blame, but the Rushs get round this with raised side tubes.
Derived from iSuP boards, D-S has become a blessing to IK floor design which hitherto had to use I-beams of parallel tubes (left) which complicates assembly and is prone to ruinous rupture if over-pressured, unless fitted with a PRV or the IK is exceptionally well made.
A Gumotex hybrid IK (below) retains the regular round side tubes of a classic IK for better secondary stability (afaiu) but features a D-S floor for much-needed rigidity. However, unique to Gumo, D-S end-panels are also used on the bow as well as shorter and less obvious panels at the stern.
A word about this fabric paraphrased from here:
“Nitrilon-Dropstich is composed of a core of 1100 dtx polyester fabric made up of two sheets joined by a mass of threads exactly 10 cm long. Unlike regular PVC-based iSuPs and D-S kayaks, the durable elastomer plastic coating is not glued to the fabric, but ‘pressure-impregnated’ which eliminates delamination risks more common with bonded PVC coatings. An additional layer of polyester-reinforced Nitrilon is vulcanised to the floor bottoms making them double thickness.”
The Rushs differ from the Thaya (1st gen Gumo D-S) with the panels forming a more ‘hydroformed’ bow, another weak point with regular blunt-nosed tubed IKs. The Rush’s bow makes a water-slicing wedge sharp enough to cut ripe avocados.
The semi D-S side tubes are more complex than a D-S floor attached to two round side tubes (like the Thaya and some AquaGlide IKs, for example) and explains the high price.
The vital stats on the tandem Rush 2 are said to be 4.2m long x 82cm wide. Compare that to my Seawave at 4.5 x 78; the Seawave has an 11% better length/width factor (LWF) of 5.77 vs 5.12 over the Rush 2, but those are my Seawave measurements. The side tubes are said to be 19/20cm on the Rush compared to 22 on my Seawave. This and the length may contribute to the load rating dropping to 195kg vs 250 on the longer Seawave. That’s still plenty, unless you’re hauling a moose carcass out of the Yukon.
The official weight varies between 15.5 and 17kg, depending on where you look online. The higher figure is the same as my modified Seawave with packraft seat mod.
Pressures are another obvious difference with the Seawave. The 6cm D-S floor runs at 0.5bar (7.2psi), actually a modest level for D-S, but an IK doesn’t need to be as stiff as a iSuP board.
The slimmer side tubes now 0.25 bar or 3.75psi (same as the Seawave). Well, that’s according to the table from the online manual shown below. Many outlets still list 0.2 sides and so did the Gumotex website until mentioned it to them.
0.25 is a bit higher than normal IK pressure but not quite as high as 0.3 in a Grabner, a Zelgear Spark or the 0.33 bar on my modified Seawave. When you combine that with the stiff D-S floor, the 0.25 sides must make the Rush IKs Gumo’s stiffest IKs by far. The difference is, I added PRVs to my Seawave sides before running them at 50% higher pressure to automatically protect them. The Rushs don’t have any PRVs which explains the warning in the manual, above right. It’s odd but worth remembering that my super-stiff Grabner Amigo didn’t feature any PRVs either, not even in the floor. Quality of construction (gluing assembly) must have a lot to do with it.
When you add any colour you want as long as it’s black, you do wonder if no PRVs is a good idea, because in the sun black things get hotter, faster. Black may be great for Cockleshell saboteurs, not so good for visibility at sea and it kills photos stone dead.
It’s true the Innova-branded Swings in North America have long had black hulls and no one complained. But they run 0.2 bar so need help in stiffening up in the hot sun. They also have fixed decks in red. Many Grabner IKs are now made with black exteriors too (right).
One assumes the Rush’s grey, lowish-psi D-S floor can handle increased pressures from passive solar heating, especially as it’s in the water most of the time. But the black side tubes will get taught which becomes a nuisance to manage (or worry about), even if tubes/cylinders handle high pressures better than flat slabs.
In fact, as you’ll see from the comments below and elsewhere, Gumotex have found black is not notably worse than red or green in absorbing solar heating and dangerously over-pressurising. And if you’re that worried it would be just as easy to install PRVs in the Rush side tubes, as it was on my Seawave.
Because a D-S floor is flat, one imagines it will hinder effective tracking, despite having a skeg at the back. The flat hull will plane over the water and wander off to the sides like a packraft – the so-called ‘[windscreen] wiper-effect’.
So, similar to Sea Eagle‘s patented NeedleKnife Keel™ (right), Gumo added a more discrete ‘keel hump‘ under the bow (left) to compensate for the lack of old-style parallel I-beam floor tubes which added a directional element. You can see from the overhead image above that this keel hump is mirrored on the floor inside the boat, either by design or need. This protuberance makes a high-wear point on the IK in the shallows so it’s just as well the floor is double thickness Nitrilon, as mentioned above. It’s the same on any boat. On my Seawave I pre-emptively added a protective strake – a strip of hypalon – to the central tubed rib, though to be honest it never got much wear as i try and be careful. Mine was hardly worn in five years of mostly sea paddling.
Rushs can be fitted with optional decks (green on the R1, above, red on the R2, below), using the same velcro system as the Seawave, with those horribly bulky alloy spars (right) supporting the decking (surely a flexible rod like tentpole material wouldn’t be hard to make). I read on other reviews that they’ve greatly improved the coaming (hatch rim) so that spray skirts attach more securely.
The footrest appears to be the usual rubbish cushion adjusted by strap and seats can be moved to a variety of positions, too.
Seats are now solid foam, but the base looks too thin and low to me. A stiff foam backrest (with side bracing straps) is good, but an inflatable seat base is much more comfortable to sit on because you can vary the pressure and so the height. Unlike anything inflatable, foam eventually loses its cushioning. But an inflatable seat just doesn’t need to be made of hefty hull-grade hypalon, as on other Gumo IKs (more in the vid below). But anyway, a seat is easily changed to suit your prefs. More on IK seats here.
Below, a review of a Rush by Austrian Steve. Can’t understand a word but some observations: I like his convertible Eckla Rolly trolley/cart/camp chair; also love the lovely long canoe chute at 20:40. Have to say though, I winced a bit at some boat dragging here and there. Do the right thing, Steve; it only weighs 12kg! Note also this shortish boat seemed to track pretty well without a skeg – the frontal keel-hump may be effective in leading it by the nose, after all. But in the comments Steve admits the stiff, flat floor slaps down hard on wave trains coming out of rapids and I suppose would be the same at sea. It’s a drawback of flat, raft-like D-S floors.
See this for an easily translatable written review also in German.
The price of an R1/R2 has already jumped
from a hefty £900/£1200 to €1150/1500, plus decks going from £200/310/370 (tandem). There’s also a rudder kit (price unknown) which will be similar to the Seawave unit. IMO it’s not so useful, even on the longer R2. But like decks, some may like the option.
As you can tell, I was comparing the Rush 2 with my 5-year-old Seawave and wondered if it might be time (or an excuse) to change. An unprecedented five years of ownership proves there’s nothing wrong with my Seawave [I sold my Seawave in May then bought another in October].
What are the benefits of a Rush 2? Black is not such an attractive or useful colour for a boat, and neither is losing a foot in length or 50kg in payload over the Seawave – at least at sea. On a river the greater nippiness from less length will have benefits, but for that I have a packraft. As for greater rigidity, it looks pretty good in this clip but my adapted HP Seawave was very good compared to the lower-pressure Gumboats, and it seems the speed (see below) is no greater. Being a bit shorter, I wouldn’t expect it to be.
The word is a Seawave with a D-S floor will be out at the end of 2021 but that will begin to approach Grabner prices. Gumotex had a bad summer in 2020; either due to lockdown shutdowns followed by very high demands for IKs, or as I read elsewhere, a failure in the PES core during testing which saw them ditch hundreds of boats. Who knows, buy by the early autumn of 2020 supply was creeping back, except for the exotic new Rushs.
Good owner’s review (in French)