Armstrong HS1250

Not quiet ready to chop my 1250 yet , been playing with fuse lengths/ shims/ mast position and now mast wedge on my board which has tail rocker. I have been able to rail to rail turn almost as good as the 1050 on the 1250 with 50 fuse as long as I dive lower on mast into the turn then really lay it over hard then no sign of breach and it switches back to the other rail no problem as long as you commit to it. I have only experienced it being sensative to breaching in flat turns which will cause any wing to come down.The mast wedge has improved lift and pump at the expense of late/ steep takeoff ability. If chopping takes away the flat turn breaching sensitivity that would be great , don't feel it needs to be any looser than it is with the 50/+1 but like Hilly said I would hate to lose that power and drive out of a hard rail turn, might wait a little longer as have had some awesome sessions on it and once it's chopped that's it.

Sorry can't work out how to rotate top photo, but the wedge is 10mm to 3mm so a lift of 7 mm at the rear.Ideally you want the mast plate level with the deck of your board, and on my fanatic 4'8 it took 7mm wedge at the back to get that see in the top photo.
Need longer screws to mount with wedge 40mm and 33mm screws which for t30 m6 316 ss you can get from Bunnings for a pack of 8@45mm for $6.60 and just cut them down.

Most boards are flat throughout the tail and don't need wedge but fanatics, JS are not and if you look at Sunova SUP boards the tail has rocker but the boxes have been mounted level and sit higher at the back for this reason.

Advantages to tail rocker = steeper larger waves are easier to take off on without getting launched. The board releases from the water easier. It allows you to point the board and foil down to gain speed and reduce lift on bigger waves.

Disadvantages of tail rocker = board can be harder to paddle as foil is pointing down.It makes gliding efficiently more difficult on small waves. And it makes pumping harder as the board is not as lifty and at the optimal angle for pumping efficiency.

Hmm , interesting he uses a wedge the other way round, once up and riding on a wave you don't really notice the tail rocker, but it does effect things even though in theory it shouldn't. Did you use a 16mm wedge on your board or do you have 16mm of rocker ?

For winging yes, proning a little more..

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hilly said..
KDMaui tail is a winner. I got the 15 which has less lift than the stock 232 but is super smooth, faster and carved really well. still undecided about chopping the 1250 might try a chopped one again.

Cool wondering if the new thinner A+232 chopped to 212 would be as good as the KD maui ?Yeh I wouldn't rush into the 1250 chop , especially if you have the KD tail to experiment with first, as tails can make a lots of difference, does the KD improve the breach characteristics? .
I wish I had a chopped 1250 to try first, least you have the opportunity to compare.

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eppo said..

hilly said..
KDMaui tail is a winner. I got the 15 which has less lift than the stock 232 but is super smooth, faster and carved really well. still undecided about chopping the 1250 might try a chopped one again.

Ah good to know. Not sure I want less lift but the other advantages probably out weigh this. Then again with a minus 2 shim that less lift might not even be an issue.

Just chopped 1250 for the turning. Turns better you just must hook it harder to get the kick I like out of it. Fun times

18mm

??looks good , I know I'll end up doing it too the curiosity will get me in the end

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Piros said..used a grinder it gives a much better finish .

That's debatable

I was going to use a cutting disc but it seemed easier with a hack saw. Then sand paper or a file. Power tools can be so quick its easy to go too fast and take too much off. I was surprised how easy it was to shape with sand paper.

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kobo said..
Not quiet ready to chop my 1250 yet , been playing with fuse lengths/ shims/ mast position and now mast wedge on my board which has tail rocker. I have been able to rail to rail turn almost as good as the 1050 on the 1250 with 50 fuse as long as I dive lower on mast into the turn then really lay it over hard then no sign of breach and it switches back to the other rail no problem as long as you commit to it. I have only experienced it being sensative to breaching in flat turns which will cause any wing to come down.The mast wedge has improved lift and pump at the expense of late/ steep takeoff ability. If chopping takes away the flat turn breaching sensitivity that would be great , don't feel it needs to be any looser than it is with the 50/+1 but like Hilly said I would hate to lose that power and drive out of a hard rail turn, might wait a little longer as have had some awesome sessions on it and once it's chopped that's it.

Thanks for the explaining the base plate mast shim advantages and disadvantages. Been experimenting with different base plate mast shims with different foil set ups. Amazing how much fine tuning you can do with foil set ups.

Rode a friends chopped 1250 today with Kane 13 inch tail wing and 60 fuse.
Amazing how well it turned was sensitive to side to side movements and still pumped well.
Not as much glide as before but still was pretty good.
Did not get enought time on it but seemed to not ventilate anymore on wing breaching on turns.

Sold my 1250 because I could not stand the instant drop ventilation when a wing tip breached on hard turns. My opinion is you had to work to hard to think about being as low as possible on the mast when turning with stock non chopped 1250 regardless of tail.
Think the chopping of 1250 makes it a much much better wing than before for high performance turning.

Could fine tune tail wings and fuse for pump/ turn/ glide preference but worth it to chop the 1250.
Just do not know how much to chop/ shape/ ect. Sure all of it matters but not a foil designer but seems worth it to guesstamate and chop.
Those stock turned down turn tips definetly ventilate when turning and you want to get rid of that...

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kobo said..there goes $900 odd bucks.

Yep, I thought long and hard and tried it a few times before devaluing mine
Worth it though. I have not noticed less glide. Rode some tiny waves yesterday sup foil and it felt great.
Only downside is a bit of noise and rarely on some hard backhand bottom turns it got locked into a track, but that is a flat foil characteristic that it had before. Might round the ends a bit like Piros has done.

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foilgold said..Wondering if it is better to have tips shaped like a signature / takuma with sharp back edge vs lift with a more rounded back leading edge.

That would be personal taste I think, what feel you like the foil to have as it turns and pumps. Takuma sharp edges would freak me out.

15mm chop

Turn easier = yes
Turn better = depends ....turns softer with less bite.
Ventilate less = yes
Stop ventilation = no
Pump better = no (same as before, but stalls a tad earlier)
Glide better = no (same as before)Pump, glide and speed feel similar to before.Overall worthwhile = Depends on your priorities ,but definitely less ventilation with more warning and a softer breach.
Not as much bite and track in the turns and stalls a little earlier on the pump.
Only my impressions after back to back 3 hrs sessions in similar conditions.

Been riding my chopped 1250 for apx 3 hours as well. My results compared to Kobo
Turn easier = yes Agree
Turn better = depends ....turns softer with less bite. Agree , got mine to slide
Ventilate less = yes Definitely mine ventilates heaps less
Stop ventilation = no Agree but very little
Pump better = no (same as before, but stalls a tad earlier) Disagree I'm pumping way better and much longer with way better flow , huge difference. (Could be my weight or just my pump style )

Overall I found the wing just easier to use with more flow to the pump and wave connect. Definitely better on the +1 rather than the zero.