Tag Archives: packraft knee braces

Sigma TXL: seat and sailing sorted (videos)

Sigma TXL Index Page

The winds here have been belting out at up to 40mph for days, but I grabbed a quickie during a lull the other afternoon to try out some final mods.

Foam backrest: much better

My centrally seated TXL is like a small TPU kayak – the missing link, some say – so it needs a backrest that works. I was never won-over by the Anfibio inflatable backrest on the Revo or my boat; it manages to be both mushy and wobbly.
But once on the water it was soon clear that, combined with my Lomo holdall wrapped into a footrest bundle (below left), the foam SoT backrest felt much better. The broader, firm pad spreads across the back supportively and is held up with straps, not thin elastic. Plus being able to press feet side-by-side against a flat, firmish surface, not jam feet into the bow, is also much more comfortable. It felt just like my old Seawave!

I was giving the Multimat air floor one more try. It must do some good and I admit it may have helped replicate the IK feel. And unlike initial impressions, the half-inflated seat base is actually pretty stable sat on the stiff floor, not wobbly as I originally thought. Plus the pad protects the floor from impacts below, and heel scuffing inside.

I did feel again that the TXL skates across the water a little, bobbing on the stiff air floor. This flat-floor effect makes sense on a shortish 3:1 ratio boat and was one reason I thought a front skeg might be helpful (it wasn’t with the stock rear skeg). The air floor lifts the boat a bit higher in the water and the sliding left to right is more from wind and waves than in reaction to paddling strokes (like normal packraft bow yawing). But until conditions get too rough I don’t think it really hampers paddling progress that much. It’s a packraft after all, not a jet ski!

While I had the floor in, I tried the 15-cm thick seatbase fully inflated and sure enough, like Anfibio say, it’s too high and may get unstable on anything other than flatwater, even with my repositioned knee straps for added support (left). That’s why they offer the 5cm foam block (it’s on ebay, fyi). A thinner inflatable seatbase would be less agonising but it seems, like on an IK, the half-inflated stock seatbase actually works fine.

Only one skeg needed

The other test was a skeg repositioned on the floor for full submergence – this is only needed for sailing; the TXL tracks well enough with the semi-submerged stock skeg position and goes OK without one. Had I not seen the selfies (left) and not tried sailing, I’d probably not have noticed.

The afternoon’s glassy calm had turned already. I pushed into the breeze out towards a low-tide skerry just off Tanera Mor, then heeled round for the mile back to Badentarbet beach and flipped out the WindPaddle. I left the stock skeg in place which was cheating a bit, but I’m pleased to say my earlier problems with weathecocking (stern blowing round, side to the wind) have been solved. No surprise a fully submerged skeg makes the TXL sail as well as my Rebel 2K and MRS Nomad.
This was an important thing to pin down as I want to be sure my bloaty, IK-replacing Sigma TXL has something up its sleeve when the wind allows because, like any inflatable, in the other direction it will struggle as headwinds reach 15-20mph. Sailing still needs constant micro-adjustment, but it’s great to feel a gust tugging at the handlines as the Sigma ploughs a trough through the surf like a water buffalo wading across a mudhole. The boat was definitely hitting 7kph or more at times.

I was also trying an idea I didn’t get round to testing on my narrower-bowed Seawave before I sold it: a WindPaddle transverse bowsprit™. Those cunning Chinese will be copying it on ebay any day now.

TXL vs MRS Nomad spacing

A WindPaddle disc sail starts bobbing madly left to right when winds get much over 10-15mph – it can’t unload the air fast enough. This is a side effect of mast-less downwind sails, but I figured if the bow sail attachments were further apart and more taught, the bobbing might be constrained. You want a downwind sail at the very front of a short boat, but on the TXL thr frontmost mounts are quite close together (compare to a Nomad, above left).
My ‘transverse bowsprit‘ is a stick which extends the sail mounts out to the sides, like ship rigging. I used a foot-long bamboo stick with some Rovaflex loops on the ends and for the weight and minimal faff, I like to think it worked. A bit longer would be better; I have a 50cm rod lined up for next time.
A few days after posting my sailing vid, YouTube thoughtfully directed me to a ten-year old video where a bloke with a hip-wide surf ski had the same idea (above right). Only he managed to zip along at a breathtaking 15kph in a 40kph breeze!

Heading towards shore, again, I aired-down the Multimat but again, can’t say performance deteriorated noticeably. After all, the MRS Nomad manages fine. The stiffening breeze rushed me towards the rarely exposed sands of Badentarbet beach and a short walk home.

So. Good to know the TXL is now largely sorted. Weather-wise, it’s been a wash-out in the far northwest this year, but there’s still enough summer left in the heatstruck south to do some trips.