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by tegirinenashi
Wed Oct 02, 2019 11:22 pm
Forum: Snow / Land
Topic: climate change / unpredictable weather/wind
Replies: 1030
Views: 22701

Re: climate change /unpredictable weather/wind

My question is: What would it take to convince you that climate change is happening, and is caused in the majority by humans and it's impacts will be significant? What evidence would you be looking for? Would it be science based evidence? Would it be evidence from different types of people? Or woul...
by tegirinenashi
Tue Oct 01, 2019 1:31 am
Forum: Kitesurfing
Topic: Ocean Rodeo bar QR looks identical to Liquid force ?
Replies: 11
Views: 1190

Re: Ocean Rodeo bar QR looks identical to Liquid force ?

Does shift bar have soft ends?
by tegirinenashi
Sat Sep 28, 2019 10:55 pm
Forum: Snow / Land
Topic: climate change / unpredictable weather/wind
Replies: 1030
Views: 22701

Re: climate change /unpredictable weather/wind

The issue with topics like this are the trolls. You seem to be a reasonable dude, but did you look to the issue yourself? (As opposed to delegate your trust to some propaganda web sites allegedly representing some faceless "science majority"). You have mentioned how pollution is bad, but isn't it e...
by tegirinenashi
Sat Sep 21, 2019 2:02 am
Forum: Hydrofoil
Topic: Fastest Foil Combo (To beat AC 75)
Replies: 22
Views: 1413

Re: Fastest Foil Combo (To beat AC 75)

On some further reflection I'm puzzled by the choice of CF as preferred material. Certainly, CF is superior when we are concerned with strength per weight. For HF, however the strength per volume is the correct design criteria, and steel is stronger than CF by how much, factor of 3? With so much str...
by tegirinenashi
Sat Sep 21, 2019 12:29 am
Forum: Hydrofoil
Topic: Fastest Foil Combo (To beat AC 75)
Replies: 22
Views: 1413

Re: Fastest Foil Combo (To beat AC 75)

Certainly, the total drag is the sum of 3 factors: kite, sailor, and hydrofoil. Any idea what are they in proportion to each other? For hydrofoil component, how is the drag split between the front wing and the mast? (I assume fuselage and stab impact is negligible). If the mast drag is significant, ...
by tegirinenashi
Fri Sep 20, 2019 4:43 pm
Forum: Hydrofoil
Topic: Fastest Foil Combo (To beat AC 75)
Replies: 22
Views: 1413

Re: Fastest Foil Combo (To beat AC 75)

There is one more factor: boat vs. kite sailor aerodynamic efficiency. Witnessing human body hovering above the kiteboard in somewhat awkward "poop" position, it occurred to me that among the other things they try to minimize the drag. Indeed, when riding at 40 knots the drag due to apparent wind ex...
by tegirinenashi
Thu Sep 05, 2019 4:12 am
Forum: Kitesurfing
Topic: Cabrinha Switchblade: distance between valves
Replies: 1
Views: 294

Cabrinha Switchblade: distance between valves

If you happen to own 7 or 8 m Cab Switchblade, what is the distance between the inflation valve and center strut hose offshoot? (I'm considering Cab SB leading edge bladder as replacement for another brand and this distance is critical for compatibility).
by tegirinenashi
Sat Aug 31, 2019 3:05 am
Forum: Hydrofoil
Topic: Sealing alu strut - still a no-no?
Replies: 24
Views: 5110

Re: Sealing alu strut - still a no-no?

Use thin jewelry screwdriver or knife with sharp tip to take the plugs out. Be careful: if you don't catch the plug with the tip of the knife, it will drown down inside the mast under the pressure when you push it. Instead, poke the plug at 45 degree angle to depth of couple mm and pull it. Cover th...
by tegirinenashi
Mon Jun 17, 2019 10:12 pm
Forum: Kitesurfing
Topic: Inflatable race kites
Replies: 17
Views: 1154

Re: Inflatable race kites

On some more reflection, just thinning leading edge would allow increasing the pressure. Say, the LE is reduced to half diameter, would it allow 2x pressure increase? Experimenting along these lines is relatively cheap, because one can use existing materials (TPU bladders + dacron). Certainly, front...
by tegirinenashi
Mon Jun 17, 2019 2:07 am
Forum: Kitesurfing
Topic: Inflatable race kites
Replies: 17
Views: 1154

Inflatable race kites

Is anything happening in this area or LEI manufacturers completely gave up on this idea? Cabrinha Apollo was a half-hearted attempt to make LEIs relevant at the racing scene, but it didn't go far for several reasons: 1. The kite is C shaped, with significant m^2 loss in projected area. 2. The AR is ...

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