Comments by "OpenGL4ever" (@OpenGL4ever) on "Real Engineering" channel.

@snowsnow4231 T-90 is only for small people. That limits the space you have to put armor around and this is the main reason why they weight less. The other reason is, that they use an autoloader, which also reduces the amount of space, you have to put armor around. You can't put a man with a height of 1,85 in a soviet tank. But you can but such a tall man in an M1A2 Abrams and a Leopard 2.
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Batteries are not effective as seasonal storage because they are too expensive in relation to their storage capacity. Power2Gas is much better in that case, because its investment costs are much cheaper. But it does have a huge disadvantage. You need about 4 kWh energy to make 1 kWh of storage power. If you have to buy these 4 kWh of energy your stored 1 kWh will cost 4 times the price of 1 kWh. Then you have to pay the loans, the facitilty, tax etc. this will add to that costs making this 1 kWh of stored energy very expensive.
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@Terribly_Grimm The Leopard 2 has a longer and thus more powerful gun. This makes the M1A2 Abrams the second best tank in the western military, while the Leopard 2 is number 1 until the KF51 Panther gets into service some day.
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@Terribly_Grimm I never claimed that.
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This is a very great video. 👍 Many videos about tanks are only shallow, but this one goes into the technical details and is therefore very good.
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@ImBigFloppa M829 is radioactive.
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@mabl4746 Because the people in certain areas are taller and thus you don't have a choice.
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Well, in the past your father was correct. The solar panels were made of very thick silicon wavers in the past compared to today and this adds to energy costs. Today they are very thin, which means you need much less silicon and this saves a lot of energy. Because creating these silicon wavers is a very energy consuming process.
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@voin5371 Sabots are only used in smooth bore guns. The sabot makes the acceleration possible while the much thinner projectile can have fins that give the stability. The advantage is higher kinetic energy and thus more penetration power. In a rifled gun, the projectile is forced into spinning, thus it can't use and doesn't need fins. But to make the projectile spin, you have to push through the rifled gun and by doing so, you also loos energy. That's why the kinetic energy is lower. And this is also the reason, why the Brits are changing the gun in their Challenger tank from rifled to smooth bore in the Challenger 3. An advantage of a rifled gun is higher accuracy at long range, but this doesn't help much, if you can't penetrate an enemy tank at long range.
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@nemisous83 A sabot is a cage around the projectile that accelerates the projectile and the projectile does have fins. If you spin a sabot, that projectile with fins in the inside will start to spin too as soon as the sabot are dropped after leaving the barrel and this doesn't work, because spinning fins is a no go. Thus if you really want to use a thinner projectile with a sabot and make the sabot spinning, than you mustn't use fins at the projectile.
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@nemisous83 The propellant accelerates the sabot. The sabot clogs the barrel so gases cannot escape and pushes the projectile with it. The reason sabots and thin projectiles are used is because the thin projectiles don't fall as steeply with distance as projectiles that are the same diameter as the cannon. Wrong, the driving bands are there to protect the cannon from abrasion. Spinning the projectiles is desirable because it increases stability in flight. In that case you can't attach fins to the projectile and have to omit the fins. The fins are only found on smooth bore gun shells because there is nothing there to spin the shell and stabilize the trajectory. That's why the fins are needed there.
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@nemisous83 According to the Wikipedia article, the driving bands have the following functions: 1. Center the rear end of the projectile in the gun barrel. 2. Seal the bore to prevent burning powder gas from moving through the rifling grooves past the projectile. 3. Engage with the rifling of the barrel to spin the projectile and stabilize its flight. And it is made of soft metal to protect the gun barrel. Point 3 shows clearly, that it is there to make the projectile spin. It is not there to prevent the projectile from spinning. If you want archive that you would use ball-bearings between the driving bands and the projectile.
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@nemisous83 Yes, they have fins. That's why you won't want to make them spin. That's exactly what i said before.
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@threestrikesmarxman9095 I think they will use what is available in NATO territory. It might be different for foreign missions outside of NATO territory. But for the none nuclear US carriers they use definitely jet fuel for the carrier's engines. That way they only have to have one fuel storage for the carrier and the aircrafts.
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You US Americans will be assimiliated by the metric system. Resistance is futile!
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@andyfreeze4072 Please do the maths. You need a price drop to a price below around 5 dollars per kWh capacity to make them affordable for the energy requirements of a saisonal energy storage system. We are a long way from that today. The raw materials for a 1 KWh battery alone cost many times as much.
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