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by tegirinenashi
Sun Nov 19, 2017 1:31 am
Forum: Kitesurfing
Topic: Channels on a surfboards
Replies: 9
Views: 470

Re: Channels on a surfboards

...Channels of various sorts are %100 proven to work in many different hydrodynamic aspects. Look at water skis, look at boats, look at finless park wakeboards, look at basically any performance watercraft and you'll see channels or chines of some sort... Citation needed. Look, if channels are in a...
by tegirinenashi
Sat Nov 18, 2017 9:16 pm
Forum: Kitesurfing
Topic: Channels on a surfboards
Replies: 9
Views: 470

Re: Channels on a surfboards

There are holes for 5 fins at the OP images. I bet nobody ever mounted all 5 fins at once, so in terms of performance I would have more worried about turbulence caused by those open fin holes than channels. And the fact that nobody cares about this turbulence implies that the effect is minuscule. To...
by tegirinenashi
Sat Nov 18, 2017 3:16 am
Forum: Hydrofoil
Topic: Chinese KB Hydrofoil : 300 USD + shipment
Replies: 285
Views: 34777

Re: Chinese KB Hydrofoil : 300 USD + shipment

... All they [chinese copies] do is to suck resources out of an already small industry. You have it backwards. The industry is small because you want to keep your profit margins ridiculously high. Every time a vendor decreases sale price the volume goes up. Abusing automotive analogy, one may think...
by tegirinenashi
Thu Nov 16, 2017 9:15 pm
Forum: Hydrofoil
Topic: Chinese KB Hydrofoil : 300 USD + shipment
Replies: 285
Views: 34777

Re: Chinese KB Hydrofoil : 300 USD + shipment

Preaching never works 100%, so the kite/hydrofoil industry better find some solution to the problem. Having said that, Real $599 is indeed very good deal. Let me enumerate what you would have get there (and won't with aliexpress): 1. Case 2. Wing covers 3. A mast that has 4 times better torsion resi...
by tegirinenashi
Tue Nov 14, 2017 4:23 pm
Forum: Hydrofoil Builders
Topic: Dihedral stabilizers
Replies: 10
Views: 600

Re: Dihedral stabilizers

Are we talking the same terms? https://en.wikipedia.org/wiki/Aircraft_principal_axes I never tried short fuselage (will try DYI extra long with JNJ wings next Spring), but would speculate that fuselage length is affecting pitch, not yaw stability. I'd further suggest that second generation LF improv...
by tegirinenashi
Tue Nov 14, 2017 4:25 am
Forum: Hydrofoil Builders
Topic: Dihedral stabilizers
Replies: 10
Views: 600

Re: Dihedral stabilizers

Stabilizer main function is pitch stability. For that matter, yaw stability is the duty of the mast, and roll stability is responsibility of the main wing. Dihedral (or anhedral) stabilizer makes no sense whatsoever.
by tegirinenashi
Mon Nov 13, 2017 6:14 pm
Forum: Hydrofoil Builders
Topic: New North Foil's 'PA Carbon Mix 50'
Replies: 25
Views: 2438

Re: New North Foil's 'PA Carbon Mix 50'

Also the mounting screws could have been designed to be further apart: it looks like the distance between the first and the third hole is less than half of the wing chord length:
https://youtu.be/3xE-XqAeHVE?t=63
by tegirinenashi
Fri Nov 10, 2017 10:18 pm
Forum: Hydrofoil Builders
Topic: Board Blank density
Replies: 8
Views: 477

Re: Board Blank density

If you are putting three layers, then one sheet of 45kg/m3 in between the two 60kg/m3 would provide the best strength/weight.
by tegirinenashi
Fri Nov 10, 2017 5:21 pm
Forum: Hydrofoil
Topic: DYI bar?
Replies: 2
Views: 448

Re: DYI bar?

Mind you posting in HF section, bar as fuselage or kite control bar?
by tegirinenashi
Thu Nov 09, 2017 10:55 pm
Forum: Kitesurfing
Topic: Are Switch kites getting any better?
Replies: 228
Views: 24643

Re: Are Switch kites getting any better?

...Clearly you must have noticed a difference between kites now and in 2006??? Depends on the brand. For example, Switch Nitros were so bad in their versions 1 and 2 that everything after that was an improvement. However, Cabrinha Switchblade is the same old proven shape which they got right 9 gene...

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