KrisFlyZ

Edge 305. Mount it on the helmet pointing at the sky when you fly with your head tucked. If you move your head too much or the pitch angle the altitude readings will be crap but it will force you to keep the head still and maintain a steady pitch . Two pretty important things if you want to fly at your best glide. Do not mount it on your hand. Kris.

Thank you. Kris.

That is awesome. Congrats

This is a picture one frame before his exit. Not an error that happened while wearing the suit...it could happen to any of us...the bootie coming off. It did have something to do with the way he exits, IMO. Kris.

This one . Kris.

These seem to be out of order... If you tried to open high enough(15-20 sec delay in a big wingsuit at that object is plenty) in the first place the location of the PC would not have been that important. The key thing about BASE is even when we intend to pull high, sometimes we get sucked low. I can go into a detailed explanation of how I got sucked low on a jump from Smell but it won't make sense to anyone else. The key bit is don't pull low. Learning to identify the ways in which we bullshit ourselves into doing things that we are not ready for is a survival skill. Kris.

I am half way thru registration...If I show up(I hardly do any flocking jumps so not sure if it will be worthwhile to go) or if you are stopping in the U.K...let me know. Would like to do some jumps with you.

What is an A? Kris.

Why do you say this? Here is why I believe that it works...as always, I maybe wrong. Because Patrick(RIP) who did quite a bit of wingsuit testing in the wind tunnel had concluded that the deflector would reduce turbulence behind his rig and give him something like 10-15% more forward speed. Because Robi put one on his high performance suits. I believe that Robi would not put anything(other than a logo or two ) on his suits that has no functional value. VKB have also said something about how the design of the Butt deflector is wrong...the design of the rig that they flew with the G3 suit was designed to address this issue... maybe? So we arrive at the question. If the air does not even stay attached for the first 10 inches of the arm wing....why do we have a huge butt deflector which takes a lot of sewing work from a manufacturing perspective. Kris.

Just a question? If the airflow is turbulent after 30% of the arm wing what good is a butt deflector? Yet we know it works...so what am I missing? Kris.

Thanks Robi. I got what you are saying. Will change to thin wool(wool might be easier to get Scott) over the next week. I just realized that my rig will be out of date for the planned trip to Belgium next weekend so I will have to pack my reserve tomorrow(under supervision)....so will only be able to do one jump tomorrow. I will stick the wool with duck tape to the sleeve as well. Kris.

So I tied threads and nylon strands to the rib sewing on my wingsuit and guess what? The first 30% of the wing of the phantom is the sleeve. except very close to the body but even there its just an inch short. Should still be interesting video if I can get the camera mounting sorted. Kris.

See Jarno...if we had yuri_base along this trip would be complete. . Will try Yuri. But you convince Costyn to stick streamers all over his new suit . I don't mind sticking them on my current Phantom. I need to buy another phantom(my choice of medium sized suit) for my new skinny ass anyway. One of the other guys will have to do video. Kris.

I got 4 GPSes and an exacti camera. This trip will be fun!!! . Kris.

Yeah...it was the one thing that the video does not show...the AoA on the performance flying segment. Wool is a great idea(until you(andi) posted it..I was only thing about how to solve the problem of videoing air flow over the wing)...I am going to put some streamers behind 30% of the phantom wings and fly at low AoAs and get video. Exciting! Kris.

Robi has stated in his second article on aerodynamics and wingsuit design why his wingsuit designs have swept back wings. It is not to mimic supersonic aircraft. It is because of strength issues. However, when flying the V suits for performance the shoulders are rolled and the wings(elbows) pulled up to almost horizontal to the shoulders. Atleast that is what worked for me. Kris.

Thanks for posting the video. Very Interesting. Kris.

Brilliant!!

Dude spend the time and mount it on helmet or wingsuit....it will be worth the effort. Kris.

Robi, It is 6:36-6:38 in the video. Andi, I found this article a few weeks ago and posted a thread. Looks like it must be included in this discussion. http://www.aerodyn.org/Wings/larw.html I heard from someone that you were jumping with little video cameras attached to the wing. Was it 2005? Were the wool threads dancing against the direction of airflow even near the leading edge? Attached pic is from this article on the wikipedia. http://en.wikipedia.org/wiki/Stall_%28flight%29 If the wool thread was in the portion of the wing past the point where the airflow had seperated, we cannot predict how it would behave. Also when we are gliding at less than 2.5 and not maintaining a steep pitch...the angle of attack is above 15 degrees. If super smooth airplane wings cannot bent the air around at that angle...is there much flow over any significant amount of the top surface of the WS wing ? I guess I want to associate the few secs of flight on one BASE jump with enough attached airflow to cause the sensation and it did. 90% of the lift coming from vortices seems a bit much to me. There is a lot of surface area increase because of wearing a wingsuit and lots of air deflection from the bottom surface. The article on aerodynamics of low aspect ratio wings says that Clmax occurs at high AoA...as high as 30. But we know for a fact(from the field... by experimentation) that at 30 degree AoA our flights suck. The article does not say how the drag coefficient varies with AoA so... Kris.

Thanks for the post Robi. Based on some of the reading I have been doing... http://www.desktopaero.com/appliedaero/fundamentals/reno.html At the reynolds numbers that we can put wingsuits in, flow is mostly turbulent and cannot be called laminar. Airflow most likely seperates from the wing before it reaches the trailing edge. My guess is that the word laminar is used by people to mean mostly attached airflow. You know that sometimes when flying a wingsuit it feels like something external is pulling us up and forward(only happened to me once). I associated that with lift being created by airflow being attached until the point that it made the contribution from the upper surface count. There is a very short clip in the Year of the Robibird video that shows this...atleast I interpreted it that way. While playing with spoons under a tap, I found that the flat less curved spoons(spoon a) created more force than the spoons with a lot of curvature(spoon b). The flow was staying attached for the whole way(like in my avatar pic ) with spoon a and seperating much sooner for spoon b. Do you think that lesser curvature of the upper surface means a better chance of the airflow seperating further down the chord of the wing? Kris.

Sorry for the thread hijack Costyn . Thanks for that Robi. I was wondering(not because of laminar airfoils ) if the stiffer material on the V2 causes a noticably better performance boost than the ZP on Phantom. What were the reasons for choosing that over readily available ZP? I am not questioning your design, just curious. We notice things and questions pop up in our minds... One of my guess was that the new material is more durable than dacron. Kris.

Dude...I am saying that the PC with a hackey that hangs loose at the apex is a properly functioning system(not in the same way as the examples you have given) and probably the most used skydiving PC system. When the PC is new the hackey handle is quite snug on the apex of the PC. But with 50 or so jumps it starts to hang loose. My point is that it is not avoidable....and if everyone started replacing/maintaining hackey handle PCs at 50 jumps... I'd give up my job and start making/maintaining PCs with hackey handles. Kris.

How do you form your leading edge when you fly your V2/Phantom? Do you bend at the elbow to let the wing take a natural shape or do you keep the arm straight? I ask this because any bending will introduce wrinkles in the leading edge. There is no way of getting around it without tailoring the arm wings for the bent position. I fly mostly with straight arms but am experimenting with bending slightly at the elbow to let the wing form its shape better. Does anyone know what arm position the Blade was designed to be flown with? It would be nice to have a wing top surface with no stitching...just smooth material probably glued on to the top of a traditionally stitched wing. As far as Phantom vs V2 leading edge, I am not sure what the reasons are for choosing a stiffer but also rougher material over regular ZP for the V2. Kris.

sure... and kill-lines can shrink, closing loops stretch, etc. All part of gear maintenance. No it has got nothing to do with maintenance...the space increases and the hacky is still a functioning system for several hundred jumps after that. This is inherent to way hackey handles are implemented. Kris.