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Hi, thanks for your comment. I agree, as far as I know there is no standardization. Therefore, I recommend to always refer to the overview shown at 07:26 and check what effect you want to achieve and how your setup looks like.

Hello @pkundrat, great that you like the analysis and your comment. May I could have highlighted that more. Will consider that for new videos. I mentioned that indirectly in sectio n "04:16 Is a long or short mast more difficult for pumpfoiling" A longer mast is more agile and perceived as less stable. I think a mast around +/- 75cm is ideal for beginners. That is also the mast length I use most in my training courses.

Hi, happy to hear that you like the video! Well, really good question. I would say it does not matter too much as the tilt angle changes during the pumping cicle from + over 0 to - position, so lesst impact due to that comparable to other factors that influence for how long you can pump (rhythm, position on the board respectively position of the body and how you transfer the mass energy of the body onto the board, ...). However, what you will have with a longer mast is a longer glide phase - while going from the highest to the lowest position - which you can then use for relaxation...

You unmasked me😉 The times of physics lectures at ETHZ Hönggerberg… luckily, studying mechanical engineering, I only had one physics exam needed for my diploma😅

Danke!

Happy to hear you like it!

Thanks for your comment and happy that you like the video. You can find the ‘overview’ you mention also on my website: pumpfoilers.ch/en/what-is-shimming-and-how-does-it-work/

Hi, agree the sharp edges of the foils "are not nice when you meet them too close". Hope your buddy and friend is fine again! Fully agree, a helmet is the minimum, at least in the beginning!

Hi, here it comes: czcams.com/video/Togn7b6X3zI/video.html - hope it helps!

Hi Andres, already looks good. What I would try to pump more with the ‘full body’ and do it with more power. In quite some of your runs, the hips stay at the same height. What I want to say that you only pump with the legs. So try to give a strong push in the downwards movement. When you go up, stretch the body more through and relieve to pressure on the board. You need that phase to give the board time to get up and gain height. ‘Try to jump upwards in a 45 degree angle to the front’. That is also the reason why you very often see the backfoot of pumpfoilers lifting up in the beginning. -> instagram.com/reel/ChaaVullz9W/?igshid=ODhhZWM5NmIwOQ== I am sure you will manage! Please also feel free to subscribe to my channel, may I once have to do a movie about that: czcams.com/channels/sNgFH9DNNeP4nmNocjyYAQ.html

Hi @Irwe905 thanks for your comment. I agree that it is very important to make people aware how to fall and what not to do. When I give training courses, I also make them aware and so far, I luckily never had an accident in a training course.

You should try it out - it's fun!

@@philipp4u2_thefoiler99 Yes I am! But it's kinda hard.I can only pump for like 30s max. I hope that I can make it 60s soon!

What kind of foil do you use?

@@philipp4u2_thefoiler99 Axis HPS1050, my weight is 77kg

Thanks for your comment and great that you like the video! Well thanks to the longer lever you may can get a little bit more quick-energy into the system. The increase in the speed / accelleration is for a great amount coming from the energy you 'inject' into the system, means the moment when you push the board with the backfoot from the downwards to the upwards movement. However, I think that the longer lever is very small compared to what impacts the power you inject in the system. But may some others here have some experience? May I have to try it myself and do some calculations around that...

@@philipp4u2_thefoiler99 Thanks for the video Philipp. I agree, the energy that goes into the downward speed because of a longer mast has to go into the energy to rise again to the top level that it originally came from. (First law of thermodynamics.) so the only energy difference in reality is that you have a longer glide time and can relax But then you need to get back to the top which needs the energy again. Its all very theoretical, but extremely interesting. I have a 75 cm Indiana Mast but am changing to a 85cm Carbon Indiana and a 1200 har. Only because I can get a 85 cm for a very good price …Unfortunately too many variable there to compare directly. But I will keep watching your channel. Maybe see you in Zürich some day. Greetings from Bremen in Germany.

Thank you. I was also thinking about doing a video about shims. But hadn't had time so far, but have it on my list! Thanks for the input!

​@@philipp4u2_thefoiler99after a lot of testing, i now use a 2 degree positive mast shim for increased angle of attack and no rear wing shim, i plan to test a negative mast shim next. Love your mathematical approach to pump foiling!

Danke, freut mi wenns hilft! Vill Spass bim Pumpe!

Bitte gern gscheh!

You are welcome! Happy to hear that you like it!

Hi, happy to hear that you like my video. Interesting topic and I already tried to find some physical explanation for that because I experience the same. I guess the main reason is that when you have "more of the mast" in the water, you will also have more drag from the mast which I guess we perceive that it is less efficient. May there are also some effects that the density of the water is increasing with more depths, but I doubt if we can really feel that due to these few centimeters. But will try to dig deeper into that 🙂

@@philipp4u2_thefoiler99 I think this has something to do with the amount of water above the foil. The deeper it is, the more water and therefore weight there is above the foil when you try to have it go up.

@@foilenvie Thanks, interesting thought. Have not considered that before as the flow around the foil is generating the lift, however have to look into that - thanks!

Thanks for the interesting explanation, very useful! I think that the increase in water density at depth is negligible due to the (nearly) incompressible nature of a fluid. What we experience is the added pressure due to the weight of the surrounding water, which increases linearly to the increase in depth. As a consequence, we will not increase lift by having the foil deep in the water, only more drag on the mast and possibly some effect by the increased pressure on the pumping cycle (not sure about this last part). And to add, in salt water, the density is higher so we experience more lift at the same depth as compared to fresh water... @@philipp4u2_thefoiler99

And of course, you have the different mechanical properties of masts of different length (torsional and lateral stiffness). All things being equal, shorter masts will be stiffer in both aspects, thus increasing control over the system (a very light-footed analysis, I know). This also plays a huge part in controlling the system. But I guess that is a topic for another video:)

Thanks for your comment and happy to hear, that you like it. Indeed, it takes a lot of time to create such a video for the community - therefore even more happy to hear that it helps!

Happy to hear that you liked the explanation. I will also try to do some more videos. Please feel free to subscribe so you get notified about new videos and explanations: czcams.com/channels/sNgFH9DNNeP4nmNocjyYAQ.html

Thanks a lot, great to hear that you like it

Hi Martin, when I first saw someone pumpfoiling, I thought: That mus be super easy, just land and move up and down... but reality told me a different story. Talking to all my friends, it took most of them between 300 and 450 attempts to be do a solid pumping-round ... so do not give up, we all swallowed a lot of water. What equipment do you use? Have you checked my other video about the body position? If you like, drop me a message on insta: philipp4u2

Happy to hear that it helps. In case you like the video, please subscribe to my channel. I will also create some more content with the goal to support the community.

Great that you like the video! Well, most riders will have to invest some starts... we made once a survey and asked the community how many starts it takes them --> pumpfoilers.ch/en/insights-into-the-pumpfoiling-community/ Once you are more experienced and you have a good spot, you should be able to achieve a success rate of 90% plus 🙂

Hi, the exact position depends on the setup you use. Whenever I use a new setup, I first check where the Frontwing is. For the first ‚jump‘ I then try to keep the center of my body right above the wing. However, other reasons that the board dives directly into the water mybe not enough initial push (not enough speed) of the board or also the alignment of the board.

Thank you!

I would assume that you understand with "efficient pumpfoing" that you want to do loger runs and for that minimiziing the energy consumption, right? Well, I would need to do some more research and testing to provide an answers with „a solid foundation“. May others have already a precise answer to this? I would say that we basically have to keep the drag low. As the drag is not linear in comparison to the angle of attack (definition angle of attack: pumpfoilers.ch/en/physics-of-a-hydrofoil/ ) , we have to make sure that the angle of attack is never too big during the pumpoing circle. Reason for that is, that with a higher angle of attack the drag increases. In addition to that, I would recommend to do „more flat pumps“ and not "too steep" ones. In addition to that, I also recommend to use the full body to induce the required push instead only pumping with the legs.

Thank you, you’re welcome!

Hello Maik, sorry for having overlooked your comment. Well, my success rate is close to 100%, but I am also pumping a lot. There are a lot of people recommending taking two or threecsteps and jumping then on board. Their argument is having with that more speed. My opinion- but also open for others - is that that way of starting requires more coordination. I also do not believe 100% in the argument, that you can reach with that higher speeds to take off. Also with jumping out of the stand (how I do it) you can give a lot of speed with the “pushing hand”.

​@@philipp4u2_thefoiler99 Hey no problem Phillip. Lots of practice since I posted question. I'm in a cold climate so docks are all gone for the season. Had to switch to a ladder set up so now I can only jump and not run. Like you said though the jump I think had made me more consistent. Less room for error. Looking forward to warm weather again so I can start using calm, flat water. Most of the spots i'm using now have current so its trickier. Thanks for you reply, Cheers, Mike.

@@mikeb4414 Happy to hear that you could make some progress! Yes, I know the problem with the spots. Most of uf are challenged with that. We startet a website to collect good spots: foilersworld.com/locations/ Would be great if you would also share the docks you using this form: foilersworld.com/request-adding-a-spot-2/ In case it is too complicated to set it up there, you can also dm me the spots in a mail. Thanks a lot!

@@philipp4u2_thefoiler99 Great idea. I'll see if I can figure it out. I'm in Canada, does that matter?

@@mikeb4414 no, would be great! Always happy to know good spots and for sure the community will be happy as well!

Here I am using the INDIANA 1100P Frontwing👍🏻

Yes, it is a 90 cm pumpfoil/kiteboard from INDIANA. Really like the handy format and pumping behavior. Do you also do pumpfoiling?

You are welcome! Happy to hear that it seems to help!

Definitiv! Eines der besten Docks, die ich kenne! Meld Dich mal, wenn in der Gegend bist!

Badi Tiefenbrunnen - foilersworld.com/spots/switzerland/seebad-tiefenbrunnen/