so, get a bigger canister and a larger needle head :D

@jessicamann684

17 күн бұрын

around 20g of the 45g of Co2 freeze durring the expansion of Liquid Co2 into a gas. The purpose of having a large cartrage (in addition to making a larger hole) is to have extra Co2 that can provide that can transfer energy extracted from the latent heat of fusion from the extra liquid CO2. Aronud 9000 J are required to expand around 29g of CO2 into a gas. And that same 9000J is taken from around 16g of CO2 to chill it to −78.5°C and then freeze it. These are just rough estimates, but it is a factor that must be consitered in sizing the cartrages for very rapid deployment.

There are several factors. IN addition to the size of the puncture and hole, you must also consiter the endothermic expansion of CO2. In the depresurization of 45g of Co2 in 100ms, about 20g solidify. On optomized solution may be to design a trigger that takes two inexpensive and common 25g cartrages and punctures them both. Having two canisters would double the hole area and possibly provide more surface area to transfer heat into the endothermic expansion of CO2.

@martinfoster5163

16 күн бұрын

Thanks Jessica. That’s really interesting. There are some companies that have multiple CO2 canisters in a tethered system. I’ve seen up to 4 small CO2 canisters. This is very smart to improve inflation times. The downside is weight and bulk it requires a new design of trigger mechanism. I was hoping that the Chinese manufacturer would just improve their penetrator design but they don’t seem interested.

I knew there had to be a catch with the low price on the amazon vests. I just bought a Helite the other day considering a $400 difference was worth it for my back and spine's sake. I'm also not convinced the Chinese vest would hold up well in a slide. Helite at least has an abrasion resistant shell. Thanks for the vid

@martinfoster5163

Жыл бұрын

Thanks for commenting. You're the first! The catch is the inflation time. The materials are just as good as Helite's because they are standard 600d polyester "canvas" and airflow mesh inside which are widely available and nothing special. These days 500m/s (half a second) is totally unacceptable. You want it to be as fast as possible. Typically under 100m/s. The faster the better. So Helite's technical superiority is only really in the trigger design. I don't know why the Chinese couldn't copy that because they copied the rest quite faithfully.

@RossGoneRogue

Жыл бұрын

@@martinfoster5163 That's interesting they've copied almost the entire thing except for the trigger. I'm assuming that the large price difference is Helite's QA being better and obviously someone has to pay for their R&D to make these vests. I still think when it comes to the health of your chest, spine and neck that the $400 is easily worth it the extra price. The 0.4 seconds could be the difference if a car pulls out in front of you or you hit a deer.

@martinfoster5163

Жыл бұрын

@@RossGoneRogue I agree. The Helite Turtle 1 that I bought is essentially the same as the Turtle 2. There were only minor changes that didn't affect safety. I think I paid about US$400. I got one for me and one for my wife. The R&D part is definitely what you're paying for. The parts and materials are very inexpensive but you've got to get the trigger design right or it's of very limited usefulness. It would only help if you flew over a car or did a high side where you're flying for quite a while until you land. Even then, the canister size supplied was insufficient. I replaced the canister with a bigger one. That part is easy but the trigger is still a poor design. That's why I tried an experiment with the Helite trigger on an XL Aliexpress airbag vest. It then performed as well as the XL Helite. At least for inflation time.

Great info, thanks!

@martinfoster5163

7 ай бұрын

Thanks for watching.

Great test! Did the Helite piston fit the huanqui chamber or did you have to replace the whole system for your test?

@martinfoster5163

7 ай бұрын

Thanks for watching and asking a very good question. I replaced the entire trigger system. The Huanqui and Helite pistons are the same diameter but it has a different shape near the pointy end that makes them incompatible unfortunately. There are a few issues with the Huanqui trigger that need to be improved. The blade needs a larger diameter and (maybe be solid). The top of the piston should be flat and the piston rings should be low-friction plastic. This would allow the piston to pierce the canister and then be pushed back into a retracted position faster and more effectively by the gas pressure. I bought quite a few of the Huanqui trigger systems for some research. It's possible that just changing the piston part would bring the performance up to parity with Helite. So I've considered machining a new part myself but I don't have the equipment. After my tests, the Chinese company I bought them from didn't seem interested in changing the piston design at all. I hope that answers your question.

Thanks for the info

@martinfoster5163

8 ай бұрын

Glad to help.

Thanks for the test and great information! I have the Chinese vest XXL with a 60 cc canister. Does that already improve the speed compared to the 45 cc in your video? Bought it to test the comfort, but I will probably upgrade to the Helite vest.

@martinfoster5163

4 ай бұрын

No, the speed of inflation won't be improved. However, the pressure in the vest will be higher. A larger vest has a larger bladder and it needs more gas but the gas flow isn't faster with a bigger canister. The only way to improve the inflation speed is to get a trigger system that punches a bigger and more perfectly circular hole. I'm working on trying to improve the penetration blade to get near to the Helite inflation times, which would be about 100m/s.

Very good test! Thank you very much for sharing it! Is there a better trigger system sold on Aliexpress or in some other store to replace the current one? Or maybe the parts to assemble the new trigger system? I would like to change it too, now I have a useless airbag that blows up very slowly :(

@martinfoster5163

5 ай бұрын

Thanks for the good question. I contacted the company who sold one of the vests. They sold me some improved trigger systems which I tested at about 250m/s inflation time. It was still unacceptable and doesn't meet CE requirements BUT it was 2x faster than the original. Maybe that's good enough for you. I think the trigger box was about $13. I sent them the specifications of the Helite trigger box (measurements etc) and they said they would try to improve it but that was 1 year ago and I haven't heard since. They probably think it's good enough but clearly it's not. My advice is to try to find a crashed Helite vest and salvage the trigger system. I was able to do this. Sometimes, in an accident, the paramedics cut off the vest which makes it useless but the trigger parts rarely get damaged. This is how I got the pieces from a crashed vest.

@icelandis7620

5 ай бұрын

@@martinfoster5163 Thank you very much for your reply, it was helpful! I have searched for crashed helite airbags but I have not found anything in my country. I think the only option I have left is to ask the seller about the "improved trigger system".Could you please give me the link to the company you asked about? I find many Fuanqui/Fuangiv/Fuanqiv sellers on Aliexpress (I don't even know what the correct name is haha) but not the official one. Oh, one last question before I forget, which CO2 canister do you use with the new system? Thanks in advance!

@martinfoster5163

5 ай бұрын

This is my email contact for airbags and supplies. They can sell you a trigger and CO2 canisters. You'd need 5/8-18 UNF 45g/60cc depending on the size of you airbag. Mine is XL and I used 45g. The original poor performing airbags used 1/2-20 UNF and those canisters are not compatible with the new trigger. Like I said, it should double the speed of the inflation. admin@xileusb.com (Alice) @@icelandis7620

@icelandis7620

5 ай бұрын

Thank you very much! I will contact them @@martinfoster5163

are there other better cheap ones

@martinfoster5163

12 күн бұрын

I haven’t found any yet. The best hope is for a big discount on reputable brands - usually European. I got Helite Turtle 1’s for a good discount because Turtle 2 had come out. There was no safety difference in the two versions. Motoairbag has some good tethered designs but I’m not sure about discounts.

@oldfashionedwrx3574

12 күн бұрын

@@martinfoster5163 how much worse is the chinese one? would it be better than nothing ?

@martinfoster5163

12 күн бұрын

@@oldfashionedwrx3574 about 1/2 second to full inflation versus 1/10 second for Helite etc. If you get the bigger CO2 canister it will protect you but not in time if you hit a car. Maybe after you fly over the car. Better than nothing though.

Very interesting video. How can we contact you?

@martinfoster5163

3 ай бұрын

Thank you. You can email me if you like: martingfoster@gmail.com

@martinfoster5163

16 күн бұрын

I’m still waiting for an email. Please feel free to email me.

Hi! Very interesting video. How can I contact you?

@martinfoster5163

16 күн бұрын

martingfoster@gmail.com Feel free to contact me.