EXPLODING FUEL BAGS?! The ultimate test

EXPLODING FUEL BAGS?! The ultimate test

Beschreibung zum Video:
***NOTICE***. Clarification at 08:15 regarding how to connect the bag. It is most recommended to use the “breather” valve for fuelling as it can be used to easily insert fuel and also extract air from the top of the bag.
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Fuel bags are all the rage lately, especially in jets where they seem to be replacing traditional plastic / composite fuel tanks.

But how do these flimsy little bags replace our tried and tested systems that we have all been using for years? Are they really safe? How do they work? How do you fill them? And more importantly, how easily do they break? Are they scratch resistant? Can you burst them through over-filling?
Let’s find out together!

-Fuel Bags, CMJets:
-Fuel Station, EL:

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fuel bags seem to be all the rage lately especially in Jets where they seem to be taking over from our traditional plastic and Kevlar fuel tanks but how are these bags replacing our tried and tested fuel systems that we all know they work and why well I genuinely knew nothing about these bags when we started filming and that’s why this is about the fifth attempt to film this video so we’re going to join all those little Clips together and together we’re going to figure out how they work are they reliable how do you even fill them are they puncture proof are they rure proof we’re going to test them beyond their limits and hopefully with that we can gain the confidence to put them in one of our own models let’s start with why they exist though as it’s about the only point I think I know the answer to and that’s weight and with it some reliability let’s look at a traditional tank it’s a mostly rigid container which doesn’t change shape we have a feed line and a breather the less fuel it contains the more empty space or air it has inside this leads us to needing a secondary tank the uat or header tank whose sole purpose is to prevent any air bubbles reaching our engine even though there are all kinds of uats most of them rely on the same principle of sucking fuel from a fixed Central Point which as bubbles always rise to the top no matter what position our model and uat are in the bubble will always be fixed towards the outside and as such the center where we’re suing fuel from will always be bubble free up until the uat fills with more than 50% air in which case everything stops working and we have a serious problem but looking at the traditional tank setup as a whole from experience we know that tank plus uat works it’s nice and safe but it’s quite heavy too we’re looking at a chunk of weight for the tank a chunk of weight for the uat and the weight of the extra fuel inside the uat it’s reliable but it’s not the lightest option and with the current 3D jet style of dying and often a 25 kilo takeoff weight limit before needing extra paperwork keeping weight down can be a priority so let’s compare that to the bag setup with its floppy construction and just one feed line it works on the principle that it gets smaller as fuel is depleted much like a balloon so as long as there was no air in there in the first place you’ll always have a perfect bubble-free flow of fuel that renders the uat unnecessary and that just saved us a massive chunk of weight as well as the bag itself being lighter than our traditional fuel tank with the tanks from this example we’ve just saved about a half a kilo in our model while still maintaining or even improving the guarantee of no pesky air bubbles in our fuel line all that weight saving is well and good but bags are bags and the idea of fuel bags doesn’t sound as strong as a fuel tank we need to push some of these to their limits and find out how strong they really are first we just need to figure out how to fill them so for this video we’re going to be looking at the new El fuel station V2 that’s just been released and which conveniently comes with a few different filling modes first impression is that it’s a serious piece of Kit containing within this handheld device is a pump already connected to the inlet Outlet festo quick releases on the bottom just behind them we have the xt60 battery connector for a 2s or 3s lipo a rear hook to hang on our fuel can and of course the big 3-in screen and input buttons so let’s just get everything hooked up and we can get to blowing stuff uh testing we can get to testing using the El fuel station V2 is quite simple straight out of the the Box we can connect a lipo press the button to start and again to stop regulating the speed with the knob and we can reverse or empty by holding the button down this is a smart station though and you can navigate the menus using the knob breaking it down you basically have 10 model memories just click once to access the menu navigate with the dial and select our model probably the first time you’ve seen a fuel station with a menu though right but why as we’ve said this is a Smart Station it can do much more than just start and stop a fuel pump within any of the 10 model memories if we click once and then press and hold we can access the menu for that particular model memory here we can set the tank size the fueling mode be it manual fuel switch or Auto the pump speed to avoid over pressuring our tank and our chosen model name subscribe there we go if we select model memory number 11 and access its menu we can change the parameters of the fuel station itself most importantly the language and the size of our fuel can as the display is going to show us not only the information for which model we’ve selected the fuel in or out pump speed battery voltage and fuel tank fill status it’s even going to show us the remaining fuel inside our fuel can which can be reset by clicking once with the rotary dial then once with the onoff button then confirming once again with the same onoff button going back to those fueling modes though we can have a different mode on each model memory but what do they all mean one option is manual mode which runs like a basic pump press once to turn on and if you wish you can change the pre-programmed speed with the knob it will only stop when you press again to stop or once it’s pumped in the programmed quantity of fuel whichever of those two happens first this is basically what we’re all used to as it will need us to keep a close eye on our overflow as unless the tank was empty we’ll need to manually stop the pump once it’s full then there’s fuel switch mode this mode uses an optional fuel switch sensor which can be installed in the model connected to the Tank’s overflow or breather line when filling we’ll temporarily connect the sensor to the side of our fuel station using the provided connector it now basically works the same as manual mode however rather than us having to closely watch the Overflow to manually stop filling the fuel station it will now stop automatically as soon as the sensor detects fuel going through the Breather and finally we have automatic mode which doesn’t require any additional accessories and actually starts by fully draining our fuel tank before fueling it up again to precisely the quantity that we’ve pre-programmed into it thus providing an exactly full tank every time for our fuel bags this last mode sounds ideal fully draining the bag before precisely refilling it again to its maximum capacity so let’s give it a try and then start pushing the pressure to see if we can get our first explosive test and this is what our setup would look like we have our fuel can going into our fuel station which is pumping fuel into our bag how do we Plum our bag though this part took me a while to get my head around and it’s part of the reason why I filmed this part of the video about five times let’s look at the bag first though basically we have one fuel line which is connected to our clunk which goes to our turbine and let’s call it a breather valve which is stuck normally at the top now unlike in conventional tanks the Breather valve must be closed for flying think of the bag as a balloon we put fuel into the balloon and the balloon gets bigger there’s no air inside it and as we use fuel the balloon is simply collapsing in on itself but there’s still no air inside if we let left the Breather valve open then air could get in and it would be not particularly good so how can we make the connections there are basically two ways it also kind of depends on how you want to be filling your bag whether with a standard forwards backwards pump or inserting an exact precise amount of fuel into it so in one situation where we’re using a normal pump basically we would connect it to the Breather valve that way when you’re putting fuel in it doesn’t matter which one you use any air will rise to the top and then with that standard pump going backwards sucking back out again it would in Theory suck out all of that air from the top and once you see clean fuel coming back to your pump you know that you’ve sucked out all of that pesky air the alternative that we’re using is we’re going to drain the bag and then fill it up with a precise amount of fuel now in this case it’s important that the bag is empty before we start and the best way to empty the bag is basically using the system which is designed to do exactly that the clunk so in this case rather than connecting to our breather we’re going to be connecting to our main fuel line which we need to use a t piece so so it can go both to our engine and to our pump in this case we’ll normally keep our valve closed for the Breather and we’ll simply sock out the fuel then put it back in again if there was any air stuck in there that’s why we have this little valve here which allows us just to allow that little top bit of air to spurt out so let’s test it out first of all let’s set up this model memory for this particular bag so first of all the capacity even though it says that it’s one liter having tested it is actually 1.6 L so let’s just increase that to 1.6 have to have a word with Carlos about his measuring methods and uh fueling mode we’re going to change it from manual as we said we’re going to go to automatic so that it will fully drain and then insert those 1.6 L there we go setup done everything’s connected breather valves closed and start so first of all it’s going to suck out all the fuel back into our Jerry can it also tells us how much fuel has been taken out so we know if we were right on the limit of running out of fuel on that last flight or if we can increase our timer because we had loads left over so it should suck this pretty much completely dry which In fairness is doing a heck of a good job it’s going to start sucking yeah struggling now it’s going to stop any second I’ll tell you what that is empty so that’s a really good sign and now in theory the easy part it should now put in exactly 1.6 L of fuel 160 170 190 to about 10% we can see it filling up we can see there are a couple of small air bubbles in there which we’ll try and get out later through the Breather valve we got half liter we can actually increase the speed as well even though it’s set in the program if for any reason you want it to go quicker or slower 950 970 1 lit so that’s in theory the designated capacity but you can see that’s still very soft a lot more capacity available starting to fill up nicely 1,400 the pump slows down when it’s reaching the end and there we are at 1,600 realistically we could probably still increase at little bit more if we wanted to but we don’t need it to be completely Tau what have we got we got two or three small little bubbles in there which if we were to open this they should should fly out basically as you can see like that and that gives us one completely full bag of fuel without any air in it good to go the fact that the pump and the bag worked wasn’t really a surprise it was expected however what happens if you try and put too much fuel in what kind of tolerances or limits are there for a given bag does it explode does it expand is it when you go over a little or is it when you go over a lot we need to know this so it may not be scientific but let’s find out what it takes or if we even can blow up a bag so first of all let’s increase the capacity of this particular bag we know it’s roughly 1,600 let’s go absolutely Overkill and say okay sure it’s 3 l so there’s no chance in theory that that you can get 3 l into a 1.6 L bag surely so that’s done and as I don’t particularly want to be picking up kerosene for the next month from everywhere in my workshop let’s just put that in here where hopefully any ruptures don’t get us all covered in kerosene and go so same as before it’s going to empty out the bag so it’s completely empty and then it’s going to try and insert those 3 lers of kerosene into this particular bag there we go so it’s empty now the fun really begins how much fuel is going to fit in the bag is it going to hold is it going to burst or when is it going to burst quick let me know in the comments below we’ll see if you get it right my guess I’m probably going to say it’s going to be okay for another 300 Millies so if we call it I’m saying it’s going to explode at about 2 L and no when it gets closer to 2 liters I’m not going to be leaning over it okay so we’re at 625 we’re a liter short of its official capacity well it’s official capacity according to Carlos is 1 lit but that’s about half full so the 1.6 L that do fit in it normally we are at 1 lit now bag’s still quite soft obviously it’s not even full yet 1.2 you can tell that as we got all the air out on the last attempt the bag is pretty much already Air free so it seems that it shouldn’t be an issue every single flight or fuel bag to make sure that all the air is out it actually stays airfree okay 1.6 L so the bag’s now at what I’ve considered it to be capacity 1.7 it’s starting to get rather tight now this is probably well I’m going to start pulling fully faces okay that’s one point okay so that’s two L 2 lers and that’s really oh dear that’s really really tight oh I don’t like this [Applause] bit don’t want to get me watch wet 2.3 I’m going to get wet I don’t want to get wet 2.4 2.5 that’s a liter [Applause] over and we’re done 2.6 lers and it’s gone absolutely everywhere great hope you enjoyed that cuz I’ve got a load of cleaning up now and we’re done 2.6 L to the next test this time we’re going to try and test how puncture prooof or resistant a bag is when it’s full of kerosene so first of all we need to fill it up we’ve put it back into automatic mode so it’s going to try and suck out any fuel if there was any this one’s a Brand New Bag and it’s now going to fill it up once again with that exact 1 and 1/2 L the same capacity as the bag itself so we’re not going to over pressurize this one this one’s more of a simulation of day-to-day flying with a little bit of rubbing maybe on a former maybe on a landing gear maybe on some other component surrounding the fuel tank or fuel bag itself so we’ve got our bag full of kerosene let’s just ignore the air for now it’s a different kind of test we want to test just how resistant the bag is so test number one just a standard former so got a piece of wood with some Jagged edges on it Okay so we’ve not punctured it although we have marked the top layer now the bag is made out of uh it’s two layers this this particular one so even if we have cut through the top layer there the second layer should in theory keep it steady we can see that it’s still holding its shape and pressure so that test obviously scientific probably not how about something equally not scientific screw driver it’s got a bit of a point on it I mean we’re not trying obviously if I were if I were to go straight like that we’ll go straight through but bearing in mind this is pressurized not bad for a plastic bag I guess how about another screwdriver this one’s a flathead but it’s a lot sharper go For Broke don’t hit yourself in the face one more okay so the bag itself seems quite puncture resistant and you would think as well that the more fuel you use in Flight the more resistant it’ll be at the moment it’s quite blown up which means there’s a lot of tension in there and it would be quite easy to cut it with say a knife or something like that but as far as semi sharp objects casually flying into it or a little bit of rubbing from a lump of wood it seems relatively resistant I mean obviously if it was rubbing on the same place flight after flight after flight I would imagine that it would eventually cut through But there again maintenance checking it up making sure especially after the first flight that there’s no damage I mean you can see I’m not sure if you can see on the video there but you can see quite obviously where it’s been scratched it’s got a kind of sandpaper look to it so if you were to do a first test flight pull the bag out you should be able to see I would think quite easily if it’s been rubbing anywhere and the final test purely for violence sake blade plastic bag is it going to hold up no it’s going to go straight through just like that surprisingly though because there are multiple layers in here that’s actually only punctured the outer layer on this particular bag it’s made out of two layers on either side so that wouldn’t have ruptured the bag interestingly that that is surprising so I still can’t reach the fuel or the clunk even though I can put my finger inside the bag obviously different surface tensions among the layers helps you there so yeah that that that has surprised me obviously if you try and go through harder you will go through more layers but I mean that’s sharp anyway time for some conclusions I think otherwise this is going to be a really long video first thing that we’ve learned is if you’re going to make anything explode with liquid put the lid on the cam it’s taking me a long time to tidy up here that was not good back to the tank though uh I would say that it’s super important to either have one of these or something similar the fuel station from smoke L really helped to get the fuel in and out properly let me clarify this the bags you can feel how full they are but depending on how you feel them you’re never going to know exactly how full they are that means as we saw in the video we put almost I think it was almost a liter over capacity and the bag was still okay before it ruptured that means you could easily put in a lot more fuel for any given flight or more dangerously a lot less fuel for any given flight now if if you’ve got a bit more fuel and the model’s a bit heavier well fine but if you think you’ve got a full tank of gas and for some reason that day when you felt it it wasn’t quite as full as usual but you thought it was you could all too easily run out of fuel so I would say 10 out of 10 there for this onto the bags themselves I’ll admit that I’m actually quite impressed yes they’re plastic bags but they’re a lot stronger than I thought they were going to be going into this the fact that it could inflate as it did with so much fuel inside and not explode for another liter I find impressive the fact that you can cut into it and you’re only cutting the top layer you’re not cutting into the center middle layer where the fuel is at least not immediately also feels impressive the whole idea of saving around half a kilo to 3/4 of a kilo depending on the size of model it’s going into for 3D Jets like this one that sounds super interesting so all in all I’m impressed with the bags at the moment the fc1 is being built it’s almost finished that video is going to be out really soon so make sure you’re subscribed for that one but at the moment that’s got the standard setup however once we get it flying most certainly we’ll be getting a bag in there and we’re putting it on weight reduction so we’ll likely be removing the brakes changing the wheels and doing all the stuff that I usually do to my 3D Jets to get them lighter so bags for the win who’d have thought it hope you learned something in this video I know it was a pain to film but I’m really pleased to have been able to have the time and the opportunity to do all these tests thank you as well to Carlos from CM jets for providing me with so many bags to basically destroy and figure out exactly how they work for myself and for all you guys out there so send him some love leave us a like subscribe if you aren’t already let me know in the comments below what you thought of this video and other videos that could be coming like it and and I’ll see you all in the next one by
Für den Inhalt des Videos ist der VideoCreator: Martin Pickering verantwortlich.
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