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by tegirinenashi
Sat Dec 16, 2017 3:32 am
Forum: Hydrofoil Builders
Topic: Mast/Strut Fiber Angles
Replies: 30
Views: 1000

Re: Mast/Strut Fiber Angles

I interpret your message, that as mechanical engineer, you have pretty good idea what stress tensors are for flex and torsion tests. This is not a homework: I'm not mechanical engineer, but would like to get a feeling how tension forces are distributed (with some approximation to their relative magn...
by tegirinenashi
Fri Dec 15, 2017 6:28 pm
Forum: Kitesurfing
Topic: Kiteboards: Flat Vs Rocker
Replies: 4
Views: 509

Re: Kiteboards: Flat Vs Rocker

Can anybody please name one kiteboarding company which publishes the rocker value? The issue is even more urgent for foilboards, where the nose rocker indicates how prone to nosediving the board is, and the only way to robustly tell one product from the other is knowing the elevation of the nose rel...
by tegirinenashi
Tue Dec 12, 2017 10:55 pm
Forum: Hydrofoil Builders
Topic: Mast/Strut Fiber Angles
Replies: 30
Views: 1000

Re: Mast/Strut Fiber Angles

Does it has to be 2 layers? If more than two, then evenly splitting the angle seems to be the most natural choice, say 0, 30, and 60 degrees.
by tegirinenashi
Tue Dec 12, 2017 7:37 pm
Forum: Kitesurfing
Topic: How to ruin your vacation with Core
Replies: 44
Views: 3241

Re: How to ruin your vacation with Core

...To all you blaming the rider: no way should any kite split on impact with water. Kites are super strong and generally can be tomahawked onto the beach without problems... How do you know that this kite has been impacted by the water? It might have been in the tree, hit exposed coral reef, or Dmi...
by tegirinenashi
Thu Dec 07, 2017 10:53 pm
Forum: Hydrofoil
Topic: The New 2018 Airush Core Foil Series Out Now
Replies: 18
Views: 1624

Re: The New 2018 Airush Core Foil Series Out Now

What are those numbers: 0.5, 1.0, and 1.2? Speaking of screw strength, the 2-screw solution allows thicker ones. The profile image above featuring 2 screw LF design is M8, while Airush looks like M6. This difference squared implies 77% more strength for M8, cubed is whopping 137%! Or yeah, don't for...
by tegirinenashi
Thu Dec 07, 2017 10:34 pm
Forum: Hydrofoil
Topic: Importance of foil weight/float
Replies: 16
Views: 744

Re: Importance of foil weight/float

I would suggest that the problem is not alum mast itself, but more of sloppy fuselage design. For example, LF alum fuselage weights 1200 grams. When located 1 meter away from the board, its angular momentum is the most contributing factor to the speed with which the foil sinks. It has really dull sh...
by tegirinenashi
Thu Dec 07, 2017 10:10 pm
Forum: Hydrofoil
Topic: The New 2018 Airush Core Foil Series Out Now
Replies: 18
Views: 1624

Re: The New 2018 Airush Core Foil Series Out Now

Let's remove possible confusion and clarify that we are talking about the same couple of spars: profile3.png What I'm saying is that these two spars are so close to the leading and trailing edge that their effect is dubious. If you are not convinced, imagine moving those spars even closer to the edg...
by tegirinenashi
Thu Dec 07, 2017 7:55 pm
Forum: Hydrofoil
Topic: The New 2018 Airush Core Foil Series Out Now
Replies: 18
Views: 1624

Re: The New 2018 Airush Core Foil Series Out Now

Your idea that three bolts makes the connection less rigid doesn't make sense to me. Are you talking about torsion? How can moving the bolts further out from the center decrease torsional rigidity? Because it is not the connection point that flexes the most? I assume that if the mast plate has a co...
by tegirinenashi
Thu Dec 07, 2017 5:11 pm
Forum: Hydrofoil
Topic: Importance of foil weight/float
Replies: 16
Views: 744

Re: Importance of foil weight/float

Never tried floating foil, but can imagine one disadvantage -- board staying on its side without a rider and floating across the wind. Somebody on this forum reported a weird behavior of his rig going upwind by itself. Is it indeed a problem, or board with floaty foil still follows you obediently li...

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