The Aire Cheetah seat (left) turned out to be no worse than the inflatable original, but was a bit lighter – even though it weighs just over 2kg. I’ve also set it up so I clip the seat to the boat’s seat mounts (which originally used a knotted bit of rope) so I can take it out at camps or to dry/clean the boat. Plus, along with the box for a footrest (below), it’s one less thing to pump up.
Firm backresting was a problem with the OE seat; or to be precise, fitting points to hold the back of the seat upright as you push back with your feet. Because the support strap is attached from the seat top to the front seat base, as you lean bank it just pivots rather than supports. The 410C is much better in this respect. To cut a long story short, I imitated them by gluing mounts to the hull’s side tubes to attach to the seat top. This way the pulling force is in a better line and the seat doesn’t pull down. Some say though that the old style seat have better back support than the plain Mk2/3 style Sunny seats.
Since fitting on the side tube mounts (the real answer to this problem) I don’t think about the seat now which must mean it works. The Aire seat is still a bit heavy though.
The OE inflatable footrest pillow was non-adjustable (on the 410C it is) and always too far away to be effective, even for me at 6′ 1″, so I replaced it with a 5010 Otter box (left), which of course has uses to store stuff on the water.
However I then noticed the strain of me pushing back off the box was tearing the lower seat mount tabs glued to the hull (where the rope used to be). The box is now attached directly to the seat with adjustable slings. This way I now push inside a ‘closed loop’ made up of the seat and box, so only straining the sling and clip joins which make up the loop – and not the boat mounts. Of course this does mean there’s some energy-absorbing slack between me and the boat, but it’s a gumboat not a K1 racer alas, so will have to do.
Although I find I’m happy to paddle with my legs lying flat, when you want to go for it a firm foot brace and a bent knee are much better, but require a fairly solid seat to push against. The long box-to-seat strap loop seems to work OK and I discovered a side benefit; the straps can be pulled over my knees to make thigh braces (right); another possibly handy feature when the going gets rough. It’s not like bracing directly off the hull or anywhere near as good as with a SinK’s ‘underdeck’; it’s more to achieve good paddle thrust using the core not the arms which they keep telling you to do. And anyway, even in the roughest rapids I’ve done, the Sunny feels stable enough without thigh braces and if anything I prefer having my legs free to stick out to steady myself (or fall out neatly). The Sunny usually swamps long before things get hairy enough to tip it over.
As mentioned above, sometimes I feel with the Cheetah seat that my butt ought to be a bit higher. It’s also pretty heavy at 2 kilos (4.5 lbs). Now I’ve inherited a spare new-style Alpacka packraft seat (left), I may try and adapt it to fit the Sunny. The Alpacka seat is not half as robust as the OE Gumo Nitrilon seat so it needs to be supported in a way that won’t wreck it. I haven’t worked out how to do that is yet; maybe a stick across the hull like a Grabner, but that requires gluing. This seat will be higher than the Aire which is an important feature with kayaks: butt higher than heels is much more sustainable, comfortable and efficient for paddling, so you want to set a seat as high as you feel safe, bearing in mind CoG and stability as discussed here.
The Alpacka seat also weighs just 220 grams (half a pound), saving nearly 1.5 kilos, or nearly 10% of a Sunny, and a bit of bulk… (but I got rid of the Sunny before I had a chance to work this one out).