Ive just moved from the axis hps 1050 to the art v2 999 and first ride i found i need to get back a bit on the board to get on foil, then quickly move my weight forward. This action results in the board porpoising up and down often nose diving into the water. I did manage a few times to get it in control and level out.
I was on the ultra-short advanced plus and 425 progressive. Is this tail too big.?
I do have a 50 Skinny. Would this help with the porpoising. Any other tips to get the bucking beast under control.
Also found the v2 999 so much harder to pump up on foil.

Sounds like you just need to get used to a higher aspect foil. The 1050 will pop up quick, whereas the 999 needs a little more board speed, then bring it up slower. Try to launch prematurely and you'll it'll keep slapping back down. You'll love it once you're used to it. Look at the centre of effort of the 999 vs 1050 and move your mast so that the board lift is matched up. I have 50 and 55 skinny and +1 shim with v2939 and v2 1099

I have both the 999v2 and HPS 1050 the 1050 being a bigger foil is a very easy foil and it does everything. I run the 999v2 with a ultrashort and a skinny 55 and it goes great but is a bit tricky in marginal wind compared to the 1050
I don't get propoising but you do need to keep some speed or flow to keep it up and smooth. Compared to the 1050 which you can just about stand still and it won't drop off the foil.

I preferred my Art V2 939 with a half degree negative shim. I can imagine I'd want that even more on the 999. I would suggest trying that. Will reduce front foot pressure and that foil's urgency to go UP.

Verify the board is balanced perfectly hanging off the chord line of the front wing. Getting it perfect really does matter.

From my experience ( I have both), it sounds to me like you need a little more speed to get the 999 up, by moving your weight back you are changing the angle of attack, whilst this can get the foil lifting, it usually results in more drag leading to stalling. Just try to get the board moving faster forward on the surface or just above it, then as your speed increases slowly bring it up to the height you want. It won't take long to change your technique a little, narrower boards make this easier.

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dkeating said..
Ive just moved from the axis hps 1050 to the art v2 999 and first ride i found i need to get back a bit on the board to get on foil, then quickly move my weight forward. This action results in the board porpoising up and down often nose diving into the water. I did manage a few times to get it in control and level out.
I was on the ultra-short advanced plus and 425 progressive. Is this tail too big.?
I do have a 50 Skinny. Would this help with the porpoising. Any other tips to get the bucking beast under control.
Also found the v2 999 so much harder to pump up on foil.

I assume that you are wingfoling. I have had both those foils, currently have the V2 999 which is my fav foil.

I find that how you experience a foil is quite personal. It depends so much on technique, what feedback you like from your foil and local conditions. Some people like front foot pressure, other do not mind more back foot pressure. Personally, I do not like backfoot pressure when foiling at all. I want to feel and control my foil with my front foot, even if I of course pursue balance and control when up to speed. My response is based on flat water or a bit calmer open water with organised bumps.

I actually prefer my V2 999 with smaller tails. I have used it with Skinny 50, 45 and now the Surf Skinny 320/48. I never use the Skinny 50 anymore, since I think that it creates too much back foot pressure for my taste. I almost only use the V2 999 with my Adv Crazyshort (600 mm) fuse. I have not experienced any pitch (porpoising) issues with the V2 999. Based on this, I would say that yes, that Progressive 425 tail is too big. I sold my P 375 tail because I thought that was too big... Overall, I have actually gone toward smaller stabs on bigger foils and slightly bigger stabs on smaller. My take is that larger foils tend to be more stable anyway and does not need that much support from the stab to get going and fly well. Also, a smaller stab makes them more free and easier to turn. As you might understand, I like larger foils with small(ish) stabs.

The HPS 1050 is a _very_ forgiving foil and super easy to get going. You need to be a bit more active with the V2 999. However, once you adapt to a slightly more active pumping style, putting less pressure on the foil, it will reward you with much (much) better glide, better speed, overall capability and a wider range.

I am 81 kgs, use 65 and 60 litre midlengths, decent wing foiler (various gybes, tacks, getting into 360s and some jumping). With my 5.5 wing, I get going in 10 knots on flat water with the V2 999.