Hellis

It's a secret

Has this thread got back on topic again? I was going to ask a question a few pages ago, and now that this thread is soon back on topic... If it is to much information to teach students how to use the knife and when, why do you get them into the plane only a few minutes later? I'm not saying your teaching is incorrect nor that it does not work, I just want to understand the reason. Many here has indicated that the students can only absorb "this much" and that adding the knife will overwelm the studens. My thought is that the knife can be a life saving tool. And if the students are so tired and can not focus anymore, is it really a good idea to toss them out of a plane at that point?

Well that is how they work most of the times. This has happened once in 600 jumps (+-). And if I had done the correct thing when I noticed it it would not have been an issue. Just shut it off and jump without. Instead I figured it would not bee to hard to keep track of 300 ft. But every time I looked at the altimeter I had to think if it was plus 300 ft or minus 300 ft. And every time I came up with a new number that should be correct I second guessed it and looked down to see if it could be correct and then I looked at the altimeter again and the cycle is complete. Jumping without a altimeter would probably have been easier for me.

Don't know about their balloons, but the ones I've been in for jumping climb just about as fast as a twin otter. Ever been in an aircraft that had to stop climbing and just hold altitude for a few or more minutes? Did your altimeter cope with that just fine? Thought so. Yes I have. No it didn't work fine with my altimeter. It zeroed at about 1000 ft. The plane leveld for about one minute and that was enough I guess. But I have never had any problems in ballons

There is still a major way that a line or bridle could wrap around that camera. And since it is on top of the head, it would be near impossible for the jumper to figure out how to get it un-done. I think the trapezoid mount is upside down. Flip it over so that the sides are smooth and tapering coming from the helmet to the camera. This is why rig container closing flaps are tapered, because it's a shape that allows things to slide off when they wrap around it. This is what I tried to explain earlier. OP: what is your goal? Is it to massproduce for everyone or make mounts for your friends or just yourself? If it's the first, I say don't. The other two: why not make it good? If it means you need to measure the curve of a helmet and print it with that perfect fit, so what? It will make your coustomers happy. And once you have done a few designs you might have got so good at redesigning the curve that it's easy to do? Or there is not that many helmet types and some even have the same shape(?).

Yup. And that is why there is few universal mounts that are perfect fit and anti snag. I like Square1's mount with 3M duallock to attach it to the helmet. If there is any gap the 3M duallock will "fix" it.

What I meant about wider at the bottom than top is that you want the line to pass above the camera. You do this by helping the line with a smooth surface. You can help the line even more by setting the mount at an angle. If you look at the camera as if it was filming you, you want the line to go up and over the camera and you (generally) do this my having a wider base then top oof the mount so that the line slides up and over the camera. Your however has the angle the other way and could force the line down towards the narrow base of the mount and in under the gap. What I meant about the gap beeing larger on the helmet than on a flat surface is: If you have a ball and place a piece of wood on it the wood/ball contact is only going to be a smal area, right? What your mount does is the same but on a smaler scale. The mount (your part) has a flat surface (the left and right "leg" are horisontally aligned) and when you place that on a rounded surface the left and right "leg" will be further from the helmet which has a rounded surface than the table you took the photos at. I can't explain it better than this without drawing a picture but I'm at work typing from my phone.

Keep in mind, the gap is "that" large on a flat surface. On a helmet with a rounded shape I bet that gap is a bit larger. Something seems odd with the 'mount'. You have the narrow part at the bottom and the wide at the top. Would not a wide bottom and narrow top be better to clear a line/webbing

And even then I'd try to compensate for it, unless it's fucking hopeless, thén I'd try to find the right line to cut... The only real scenario that makes me carry hook knives is a premature reserve deployment in the door Identify if it's the reserve, if it is, I'm cutting the risers. I wouldn't. It may behave stable when you are calm and in control. Closer to the ground you may do something stupid without knowing it that causes it to not be stable. I know of one incident involving a friend when everything seemed to be OK but the last 30 feet went pearshaped. Weelchair and a year and a half of recovery.

..until it's a problem. I find it amazing how close minded people can be in this sport. So many people just reflexively oppose any training method that they do not use or have used themselves. Probably for another thread though. I've considered many discussions where experienced jumpers are humble enough to admit that mid air rigging might cause more problems than it solves including a few who mention trying and failing to cut the right line during a line over even after several attempts. The one exception being Tom Aiello's epic BASE line over video where he didn't have a plan B. I'd be rather closed minded to reject that evidence. My remark in response to "it's not a problem" was to highlight that you cannot possibly have the data to draw this conclusion without a body of students trying to use a hook knife to clear some kind of mal. There's nothing closed minded about accepting what limited data there is to reject a bad and potentially deadly idea when wishful thinking is offered instead of data or clear reasoning. The claim made was farcical as is your attack on me. Sometimes foolish and deadly ideas are rejected because the risk that they might get an overloaded new jumper killed exceeds the benefit based on limited available evidence. That might change if training consisted of more than a one day FJC to include better simulation. So why is your 'data' that it can be a problem higher valued than our data of true grounds? As I understand some/most people do not have a knife, and therefor you do not know what it would mean having one? Will it really be a problem as you seem to believe or maybe it works just as good as it does here? We do have this rule. All skydivers have knifes. And during the past 8 years I have not heard of any incidents where someone cut the wrong line or it beeing any issue at all with having knifes while jumping. And I have never heard of any 'old stories' of it either. In what way did Tom not have a plan B? Do you mean he didn't have a reserve? Well... the knife is supposed to only be used on the reserve so how does that make it different? I do agree that mid air rigging is not a good thing if you have an option. But what if you don't have that option? Would you rather spiral to the ground under your reserve that cuting a line on the reserve? Good for you, have fun!

It's only a requirement once you pass your A license. Before this point students jump without. Crap. You're right. It's been too long since my training. Is it still included in the FJC? It was when I did mine. Well here it is a requirement. It's part of the basic rules, when you skydive you need to have a knife. And yes we do train students on when and why to use a knife and it's not a problem.

Schiphol airport, Amsterdam It looks like a Cypres may turn itself on and fire I was thinking more like this. https://youtu.be/vz_Sxh4526w And trust me, airlines do not want to pay for damages. I tried to get Air Berlin to pay for damages during about a year and they just never replied to emails, if I called them they sent me papers to fill out and then the papers "got lost", so back to square one.

Why as checked baggage? Never seen a grumpy baggage handler in action?

I'm aware of that, but the picture of the velcro is much longer than the normal square. I am trying to figure out why it looks to be about 2-3x longer than it needs to be to hold the bridle on the top flap. Uh you and me both. As soon as I saw it I was confused. Isn't a tiny pea sized piece all that's needed to to lightly hold it in place? Not a long strip.Thing is, you don't need any Velcro on your bridle anymore. UPT now recommends routing it from below and back down. This eliminates the potential for the pin to puncture the bridle and cause a PCT mal. Check out UPT's website. Even if you do route the bridle above the loop and down the velcro isn't needed. If you can add the extra slack without the velcro then the velcro serves no purpose. (And adding the slack means do not push down the bridle between the flaps)

Why? Are you affraid to overload your canopy? Have at least two in my opinion.

https://www.youtube.com/watch?v=gahWGOgX5to Wow, you're like a youtube-google-ninja. I kneel before you

"Fucking manija" is missing. It's not on youtube anymore but I know one member here has it. Probably me too, but on my laptop that isn't working.

"An AAD is a small, technically advanced device used to automatically open a skydiver’s reserve parachute." The AAD does not open the reserve, it may open the reserve container. There is no guarantee that it will open the container that's why I say "it may open".

Assuming the same flying style in both canopies, then that shouldn't matter should it? If the risers are the same with the guide rings in the same position, you need the same amount of line to reach the risers and pull them regardless of canopy size. The slack you need is the distance from guide ring to the lower position of the front riser when pulled. So if that distance is, lets say 12 inches, then you need 12 inches of slack regardless if you are flying a 120 or a 135. Distance from guide ring to front risers might be a little shorter in a smaller canopy due to less spread from the shorther chord, but that would probably be negligible. I think councilman24 means if you do not have the same flying style. The extra dots here and there is probably because he posted on a phone. So if you do use the fronts you need to lenghten them, and if you do not use the fronts you can have "french" lenghts on the brakelines.

Doesn't FAT32 have a 4GB single file limit? I have all my personal flash drives formatted NTFS to avoid this. Per TK's query, which format can be read by both PC & Mac? Yes. But is really 4 GB a limit if we are talking about tandemvideos? If you use FAT32 on your GoPro it will just split the files. The problem with NTFS is that DVDs, TVs, etc. sometimes can't read the memory.

Sure. I have tried three types of gps trackers and all three has failed because of the forces from the opening. One failed because the stitches ripped apart. One failed because the attachmentpoint gave up. And the third started opening itself because of the forces on the attachementpoint. I believe the second and third type could work, but because the forces are so strong I think it would just be a matter of time before something else broke. Even though the gpses are light (30-40 grams) I think they are still to heavy for the forces. I think what you should be looking at are the light bluetooth trackers with a CR battery. I have not found one I want to test yet because they at the moment have not enough range in my opinion. But we'll see what happens.

And too keep this posting. To make it even more clear: There is no point of opening the cheststrap unless you pull down the slider (except for comfort, but that is a personal preference). The cheststrap will not spread your risers more than your slider allow it, thus not help the issue this thread is about. If you look at a canoy from the front with the slider up you will see that the riser are straight. If you sit in a childs swing it is easy to create linetwist because the chains/lines are straight. With some angle on them it becomes much harder.

The canopy turns quicker than your body. You can do that on most canopies, I have managed to do it with a 230. One thing you can do to prevent it is to pull down the slider and open up your cheststrap. That makes your risers spread out from your shoulders instead of going straight up from your shoulders. When the risers are spread out it is much harder to get in to linetwists the way you did. Read up on what loosening the cheststrap and pulling down the slider does and how it effects you and your canopydrills when canopy is open. And what it does to your EP. Then talk to a instructor on your DZ.

I can tell you my experience about placing on the dbag. I have had 3 different types (a few off each type too) of GPSes there and they have all been destroyed by the forces. I have never thought the forces where that strong placing something on or hanging from the dbag. Yours might be better but I just wanted to warn you.

Thanks!