I've only managed one session on the 83 Pyro so far, but I'll add my first impressions.
The brief version is that it seems to do exactly what the Severne site says it will do - and I'm already very pleased with it.
But it's winter here in the UK and we fight the cold every time we go afloat. I had to go to Worthing to find wind on Tuesday but the reward for my patience was 4.8m weather and then 4.4m winds.
The waves were a bit rubbish but there were little four foot faces to ride once the tide pushed in.
The Pyro is an amazing little board and, launching into a lot of white water, my first reaction was that the 83 seemed small compared to my Dyno 85 - possibly because I've put on weight in lockdown and today I was wearing full winter wetsuit gear which weighs down any board.
But the 83 litres still floats me and this board responds well to a bit of driver input.
Any reservations soon disappeared because the board quickly leapt onto the plane..
The Pyro is very early planing and goes very fast, even in a quad fin set up. it's also very loose and lively on the wave face and holds it's speed well. The board felt totally right with the 4.8 and 4.4 rigs and there's no doubt it'll work with a 4m too.
At the bigger end, I suspect my 83 litre version will take a 5.0m sail happily but at my weight (78 kilos?) I'd maybe prefer a bigger board for 5.3m weather. Water conditions where I live usually require extra float for marginal wind.
The only thing you have to watch out for is that the smaller versions of the Pyro are quite short, even though this board doesn't get the stubby tag. This means it's loose but also requires quick/reactive driving skills, especially in the smaller sizes which are less than 220cms long.
I set the straps in the central options - at the back and for the front pair - and that gives plenty of leg stride for a wide stance - especially for my short legs. Those with longer legs can get the same stance by going to the back pair of holes for the back strap and using the front pair of straps in the very front setting.
The mast track is very short and, so far, I just stuck my deck plate in the middle. All that worked well for me and I soon got to feel where the centre of buoyancy was/is. The Pyro doesn't have quite as much buoyancy under the straps as the Dyno or Nano, with the Pyro being slightly narrower at the tail - but only a bit.
I'm guessing that the Severne Nano will do better hook turns on the wave face - due to the Nano tail kick - but the Pyro will keep speed on the wave better and it's maybe less of a backfoot board.
I can't wait to get the Pyro in some better waves but it's already very plug and play .