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by Regis-de-giens
Sat Dec 09, 2017 7:19 am
Forum: Kitesurfing
Topic: splicing advice
Replies: 6
Views: 458

Re: splicing advice

A long bury (wih or without Brumel), if well done can hold up to 90 % of the line rating. A brumel will hold quite the same when new but loose rating with time and cycles, degradation speed depending on burry length. It can loose more than half of the rating in the end, say 30-50 % with say 4 cm blu...
by Regis-de-giens
Fri Dec 08, 2017 4:50 pm
Forum: Hydrofoil
Topic: Kite loop to waterstart
Replies: 16
Views: 1035

Re: Kite loop to waterstart

Thanks ; just need to pull very hard on one line some beginners are afraid to maintain the tension all along the loop when it starts pulling hard; as a tip, if you loop toward the right , you can hold the bar by the right extremity onl ( so up to be parallel to the center power line and open the lef...
by Regis-de-giens
Fri Dec 08, 2017 3:05 pm
Forum: Hydrofoil
Topic: hydrofoil at max speed limit
Replies: 63
Views: 3052

Re: hydrofoil at max speed limit

The lift also goes square with the speed, so L/D should not vary too much if you stay in the same type of fluid flow. But indeed as I tried to say with the 500 kg effort in the legs example, actual reasonnable speed will be far below.
by Regis-de-giens
Fri Dec 08, 2017 9:30 am
Forum: Hydrofoil
Topic: Kite loop to waterstart
Replies: 16
Views: 1035

Re: Kite loop to waterstart

About loop direction backward (pull on rear hand, I call it downloop , DL) vs frontward (pull on front hand, I call it Uploop ,UL) ; I speak mainly for foilkites but I sometimes do the same with LEI if the wind dropped down surprisingly . So DL is a must, and the easiest way (because requires less w...
by Regis-de-giens
Thu Dec 07, 2017 5:12 pm
Forum: Hydrofoil
Topic: hydrofoil at max speed limit
Replies: 63
Views: 3052

Re: hydrofoil at max speed limit

Maybe, how you wrote it is very open to misinterpretation and basing a theory on something that’s open to misinterpretation is not ideal. Time to spend less time behind the keyboard theorising and more time speed sailing then😉 Unless I have the immediate opportunity to ride, I am ready to spend tim...
by Regis-de-giens
Thu Dec 07, 2017 10:38 am
Forum: Hydrofoil
Topic: hydrofoil at max speed limit
Replies: 63
Views: 3052

Re: hydrofoil at max speed limit

James, I am not wrong, you just didn't catch my purpose : of course 90 degree is not possible during a permanent ride , as it will generate no effective forward pull, hence no speed ; It is a case that will never happen in real life; it is a theoretical physical limit (assymptote) that proves that y...
by Regis-de-giens
Thu Dec 07, 2017 9:58 am
Forum: Foil Kites
Topic: Concept'air 12m Pulsion kite
Replies: 257
Views: 25120

Re: Concept'air 12m Pulsion kite

Meteo , You have well summarized the situation ; very hard to put figures on these extreme low ends and indeed people could be disappointed that they cannot ride in similar wind measured on their spot ; I now have a lot of light wind experience with the Pulsion or others, and have personally no fun ...
by Regis-de-giens
Thu Dec 07, 2017 9:56 am
Forum: Foil Kites
Topic: Concept'air 12m Pulsion kite
Replies: 257
Views: 25120

Re: Concept'air 12m Pulsion kite

Meteo , You have well summarized the situation ; very hard to put figures on these extreme low ends and indeed people could be disappointed that they cannot ride in similar wind as reported on their spot; I now have a lot of light wind experience with the Pulsion or others, and having personally no ...
by Regis-de-giens
Wed Dec 06, 2017 10:23 am
Forum: Hydrofoil
Topic: hydrofoil at max speed limit
Replies: 63
Views: 3052

Re: hydrofoil at max speed limit

What limits speed? Drag. Sources of drag: 1. Foil (hydro drag) 2. Rider+board (aero drag) 3. Lines (aero drag) 4. Kite (aero drag) If liter on ice skates can go 130kph (70knts) and liter on hydrofoil can only go about 40 knots, then the difference can be attributed to the hydro drag of the foil, co...
by Regis-de-giens
Tue Dec 05, 2017 12:47 pm
Forum: Hydrofoil
Topic: hydrofoil at max speed limit
Replies: 63
Views: 3052

Re: hydrofoil at max speed limit

I have a remark regarding the pure theoretical approach, without considering the efficiency of the foil, the vibrations, ect ... Peter is right in a sense that the hydrofoil principle has no limited speed in itself ; so we could believe that by infinitelly reducing the thrust, your leg power and the...

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