Welcome to the new episode of Gerrit’s Diary. Again, we will talk about the long-running issue “Vesuvius. We have come a long way with this. We went through all kinds of trials and tribulations. I hope that our Vesuvius evidence room won’t grow ever larger over time. First, I will show you our experiments in the past weeks. …three weeks ago… Last time the kinetic sand didn’t want to slide into the worm conveyor by itself. The worm always dug a tunnel, because the sand is packed so solid that it didn’t fall into it by itself. Stefan came up with an idea last time: To construct a system which pushes it inside. I’ll show you: The sand falls into this chute, and gets pressed into the worm. Now it’s gone and new sand slides in. It works! We’re unsure about two things: First, we have to muster up high pressure, which puts a lot of strain onto the worm. So we have to run endurance tests. Second: The sand slides down, and looks okay so far, considering that it’s a quick test, and it arrives below here. How will it slide in here reliably? You wanted to build a stainless steel chute, like a slide on playgrounds. Right. Actually, two things: A slide which can pivot, so the sands rides down evenly, and sort of a paddle. I’m considering this here. I’ll build it in at the front, and this will portion the sand and prevent it from jamming in too much. When I turn it, it will push the sand forward little by little. And a lid right here? So it will rather move backwards? Right! That will be the next step. … one week later, better ideas: Last state of affairs was to build in a worm conveyor in order to transport the lava uphill, because, we want the lava to gush out instead of being spilled from a belt conveyor and then sliding down. This is still our big aim. But the sand is so firm that it slides very sluggish. This property is actually an advantage, because, it moves so slowly. But, we cannot press it through a tube. It compresses and the tube would explode at some point. The worm is the solution, but, it rather digs a tunnel, and the sand won’t shift in, because it’s so compact. So, the idea was to take a turning drum. It will let the sand shift in continuously from above. We don’t have any footage of how we started to build it, because, all too soon we faced a problem: Now the sand is loose, but when it gets shifted back and forth inside the drum, it will get packed into a ball. So we had balls which bounced inside the drum instead of shifting into the tube. Our new idea, which runs since yesterday: I did not see this part, yet. Did you still test it? Yes, I already tested it and found the first weak spots, but this is only make-shift, with plastic, an old water line, and some wood. We have to reinforce it if we want to run it continuously. Respectively, we have to build it from metal. But, it works. The sand shifts into the worm, it gets transported upwards, it slides down since I built in a shaker, but, the circuit works as it should. How many bags so far? I counted eight, but I already noticed that one or the other handful vanished already. For playing around at home, huh? If this will work, we will offer “lava-to-go” in our shop, portioned into little bags. Very popular, this stuff! Super relaxant! Put a heap onto the desk and see how it crumbles. Takes about 5 minutes, and then you’re all relaxed! I can also adjust the speed of the shaker. Now I have the frequency at which it slides down smoothly. It’s only one volt difference! Find the perfect vibration, and it works! It runs nicely all the way down! Incredible! How do we want to control it in the end? Is the frequency always the same? Or does it depend on the volume and the situation? It depends on the volume. Of course, I can make a range of frequencies starting slower and then speeding up to get all the range. Look how nicely it flows back. The back-haul is ensured. But, take a look at the top! That must not happen! Therefore, instead of using my hand, we build in a barrier… …or you stop the shaker! If you look closely you can see the sand vibrating. Can you also see it in this area? Because here, it will disappear from sight. Yes, I also saw it at the top. All of this is shaking. Well, earthquakes are part of the game. I’m a bit anxious about the control for the shaker. How to start it? How to detect flaws? A camera-analysis is possible, but, it’d be a giant project! Most important is an endurance test. Thanks a lot for all your comments on YouTube, Facebook, and the e-mails you wrote me. You often ask me why we are using the worm, and many say that it won’t function, or wear off quickly, and blow up into our faces. We have the same concerns. This is why we do it: It was our very first idea, and so far it proves to be the best solution to produce the lava above. Also, the manufacturer claims that the worm won’t wear off. That’s what all the testing is about. The endurance test has been prepared. Now we have sturdy motors attached, the complicated control with frequency transformer is ready. Nothing stands in the way of the endurance test. On purpose we built in some flaws. This must not stand on a table later on, but on the floor. There probably won’t be this horizontal chute later on, but then again, there may be. We want to check all options which might arise in the next weeks, so we might have to bridge a horizontal stretch, respectively, one that is not so steep. Therefore, the shaker which I’m worried about. I would like to do without at the end, because, depending on the chosen frequency, the lava slides, or it doesn’t. Sometimes, the frequency is high, but, the lava doesn’t slide. If you turn it down, the sand starts moving again. I don’t believe that we manage to control it. But then, we are always seeking the challenge. Now we begin the endurance test for the shaft. At the same time we want to optimize the chute, and see how nicely we can stage the lava with colors. But, personally, I’m excited about a new airplane. Sassha has it ready at any moment. Let’s go there! I’m really happy: A new airplane – always a highlight! It is actually a A 320, of which we already have 4 or 5, you might think. It will have the number 45. But, what Arne, Sascha, and Hendrik built here is something special for us and the world as such. It is the first A 320 NEO with winglets. There’s no model for it, means, you had to build the winglets? The winglets, and we had to build the jet engines. It has new jet engines for real, which are more economical. Large, more economical, and less noisy. I live close to the airport. So far I haven’t seen one flying. I’ll take it away from you now. On the way I’ll stop at Alex’s office. He just informed me that something else is ready: The escape ladder. He tinkered at it for two years now. These are our new work stations. We’ve moved and expanded a bit, because, we’ve got more manpower with Ole now. Did I introduce him yet? There’s Felix and there’s Alex. And over there’s my office. When we moved we’ve planned to build in shutters in case I need some peace and quiet. I don’t recall using it once so far, have I? Not so far, no. They play cool music, so I leave it open. We will put this airplane into operation and test it in a minute, but, more important, emotionally speaking: The new fire trucks. Four years ago, at the inauguration of the airport, I told you that we will build the escape ladders. Turned out to be the greatest challenge of all as far as model making and the car system. We never had much time for it. The repairs of 285 vehicles consumed too much time. But now you’ve made it! Yes! I’m happy about it as well. It was a long way to go, but, not only the escape ladder got finished: Knuffingen will get some support by the volunteer fire department. Felix built it, and Ole built two new rescue vehicles for Scandinavia. Take a look: The old one started to look somewhat shabby. The new ones look definitely better. The old one gets set into the display, the new ones go into operation. And we have a complete and entirely new fire brigade for the professional fire department in Knuffingen. It has four vehicles, and, for the very first time, a Unimog. We want to show them to you. To conclude this episode we’ll show you many, many vehicles. Thank you for watching, as always, and I’m looking forward to the next time. If everything works out well, we will talk about the light control next time. Bye-bye.