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A valve spring inside a running engine does more than compress and release. The spring also rotates slowly along its axis with each cycle, and that rotation is intentional. The valve face strikes the same metal seat thousands of times a minute, and without rotation any single contact point... show more

Mechanical Knowledge

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38,421 просмотров • 1 месяц назад •via X (Twitter)

Наука и технологии Образование

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Hip rotation is one of the primary drivers of velocity during the throw. Both speed and timing of rotation matter. The goal is to have the hips rotate out in front of the torso. Ideally, you want rotation to begin quickly after the front foot strikes the ground. The speed of rotation is also critical. I strive for all QBs that I work with to be 800+ deg/sec with hip rotation speed. One key thing is to not mistake “sliding” for rotating. Many will push and slide their hips forward as opposed to rotating against a stable lead leg.

Hip rotation is one of the primary drivers of velocity during the throw. Both speed and timing of rotation matter. The goal is to have the hips rotate out in front of the torso. Ideally, you want rotation to begin quickly after the front foot strikes the ground. The speed of rotation is also critical. I strive for all QBs that I work with to be 800+ deg/sec with hip rotation speed. One key thing is to not mistake “sliding” for rotating. Many will push and slide their hips forward as opposed to rotating against a stable lead leg.

Joe Mohr

12,648 просмотров • 3 месяцев назад

It's always fascinating to watch the outflow valve (OFV) close during takeoff. This marks the beginning of the aircraft’s pre-pressurisation cycle. While it does provide a smoother transition to pressurised flight and improves passenger comfort, its main purpose goes beyond that. The primary reason for closing the outflow valve at takeoff is to prevent a slight pressure bump that occurs during aircraft rotation. At high angles of attack, an air cushion effect forms over the aft outflow valve, which can cause a momentary reverse airflow - potentially pushing air back into the cabin through the OFV. This pre-pressurization prevents FOD from being blown into the cabin, and this is also the reason the airplane lands with a slightly pressurized cabin. #FunFact

It's always fascinating to watch the outflow valve (OFV) close during takeoff. This marks the beginning of the aircraft’s pre-pressurisation cycle. While it does provide a smoother transition to pressurised flight and improves passenger comfort, its main purpose goes beyond that. The primary reason for closing the outflow valve at takeoff is to prevent a slight pressure bump that occurs during aircraft rotation. At high angles of attack, an air cushion effect forms over the aft outflow valve, which can cause a momentary reverse airflow - potentially pushing air back into the cabin through the OFV. This pre-pressurization prevents FOD from being blown into the cabin, and this is also the reason the airplane lands with a slightly pressurized cabin. #FunFact

Arjun Singh

23,830 просмотров • 5 месяцев назад

Did you know that in Blender you can easily make the rotation of one object drive the rotation of another? ✨ 1. Select your object 2. Hover over one of its rotation fields and press CTRL+D 3. In the popup select the rotation of another object 4. You can write "smoothstep(0, tau, var) * 2" to both limit the rotation and make it non-linear. Tau is 180 degrees, and it's the end angle for the wheel, and 2 is the end angle for the gate leaf in radians (3 is approx. 180, so 2 is approx 2/3 of that!) 5. To copy the animation to the second leaf, select both, press CTRL+L, and choose 'Link Animation Data'. To invert the angle, add a minus sign, and you're done! 👌 #b3d

Did you know that in Blender you can easily make the rotation of one object drive the rotation of another? ✨ 1. Select your object 2. Hover over one of its rotation fields and press CTRL+D 3. In the popup select the rotation of another object 4. You can write "smoothstep(0, tau, var) * 2" to both limit the rotation and make it non-linear. Tau is 180 degrees, and it's the end angle for the wheel, and 2 is the end angle for the gate leaf in radians (3 is approx. 180, so 2 is approx 2/3 of that!) 5. To copy the animation to the second leaf, select both, press CTRL+L, and choose 'Link Animation Data'. To invert the angle, add a minus sign, and you're done! 👌 #b3d

passivestar

107,167 просмотров • 3 лет назад

𝐗𝐀𝐑𝐘𝐔 𝐆𝐈𝐕𝐄𝐒 𝐓𝐀𝐊𝐄 𝐎𝐍 𝐔𝐏𝐂𝐎𝐌𝐈𝐍𝐆 𝐑𝐎𝐓𝐀𝐓𝐈𝐎𝐍 𝐇𝐄𝐋𝐏𝐄𝐑 𝐈𝐍 𝐖𝐎𝐖 In an attempt to make the game more approachable for new players and less reliant on 3rd party add-ons, the World of Warcraft team has announced that a rotation helper will be added to retail WoW. The rotation helper will have an additional option for a 1 button rotation option which has obviously sparked a conversation within the community. WoW streamer, Josh Lujan, has given his take on the situation saying that the rotation helper feels like a violation to WoW gameplay.

𝐗𝐀𝐑𝐘𝐔 𝐆𝐈𝐕𝐄𝐒 𝐓𝐀𝐊𝐄 𝐎𝐍 𝐔𝐏𝐂𝐎𝐌𝐈𝐍𝐆 𝐑𝐎𝐓𝐀𝐓𝐈𝐎𝐍 𝐇𝐄𝐋𝐏𝐄𝐑 𝐈𝐍 𝐖𝐎𝐖 In an attempt to make the game more approachable for new players and less reliant on 3rd party add-ons, the World of Warcraft team has announced that a rotation helper will be added to retail WoW. The rotation helper will have an additional option for a 1 button rotation option which has obviously sparked a conversation within the community. WoW streamer, Josh Lujan, has given his take on the situation saying that the rotation helper feels like a violation to WoW gameplay.

N_Tys

280,940 просмотров • 1 год назад

The 3D learning experience is thinking an idea I came up with is cool and spent hours implementing it to find out that it only works for a very specific situation aka it’s useless. HAHA Basically I rigged the collar with their own bones so they don’t deform weirdly with the arm/shoulder movement then realise the sleeve clips into the collar on Z rotation. Decided to try applying the twist bone logic of bone constraints (copy rotation) and was like wow, it kinda works to move the collar away when the arm rotates to the front! But reality is that it just looks nice on T-pose and the “effect” is weird when the arms are posed downwards (which would be the default state of the model in its intended use)… And also the sleeve will still clip into the collar at a more extreme rotation anyway so I guess it was a fruitless effort in the end hahaha It did help me get more comfortable with the idea of applying bone constraints for other uses tho so that’s a plus! ദ്ദി(•⥿•)ว✨ In the end I’ll probably have colliders on the sleeve to prevent clipping with the collar as much as possible but I think a big degree of clipping is still inevitable considering the range of movement when the model is used for 3D vtubing 🤔

The 3D learning experience is thinking an idea I came up with is cool and spent hours implementing it to find out that it only works for a very specific situation aka it’s useless. HAHA Basically I rigged the collar with their own bones so they don’t deform weirdly with the arm/shoulder movement then realise the sleeve clips into the collar on Z rotation. Decided to try applying the twist bone logic of bone constraints (copy rotation) and was like wow, it kinda works to move the collar away when the arm rotates to the front! But reality is that it just looks nice on T-pose and the “effect” is weird when the arms are posed downwards (which would be the default state of the model in its intended use)… And also the sleeve will still clip into the collar at a more extreme rotation anyway so I guess it was a fruitless effort in the end hahaha It did help me get more comfortable with the idea of applying bone constraints for other uses tho so that’s a plus! ദ്ദി(•⥿•)ว✨ In the end I’ll probably have colliders on the sleeve to prevent clipping with the collar as much as possible but I think a big degree of clipping is still inevitable considering the range of movement when the model is used for 3D vtubing 🤔

𝗞𝗔𝗥𝗜𝗛𝗔 🌘🍀 3D Artist ☻

128,210 просмотров • 8 месяцев назад

Here's a 70 minute video of my thoughts on why this could be a set-up for a rotation to broaden the bull market to various sectors and markets rather than the beginning of an impending crash. Have a great weekend, everyone! 🐱 Timestamps below: 00:00 1) Large to small cap rotation. $QQQ $IWM 09:30 2) S&P500 to NASDAQ rotation. $SPY $QQQ 13:00 3) Tech sector rotation. $IGV $NVDA $MSFT $GOOGL $AMZN $TSLA 24:00 4) Rotation into dividend stocks to broaden rally: $SCHD 29:00 5) Rotation into other sectors to broaden rally: $XLI $XLU 31:30 6) Rotation and cool down of risk-on: $ARKK 37:00 7) Rotation from $Gold and $Silver? 43:50 8) China and Japan $HSI $NIKKEI 53:10 9) #Bitcoin bottoming out? 1:00:40 10) Rotation to #Ethereum and #Altcoins?

Here's a 70 minute video of my thoughts on why this could be a set-up for a rotation to broaden the bull market to various sectors and markets rather than the beginning of an impending crash. Have a great weekend, everyone! 🐱 Timestamps below: 00:00 1) Large to small cap rotation. $QQQ $IWM 09:30 2) S&P500 to NASDAQ rotation. $SPY $QQQ 13:00 3) Tech sector rotation. $IGV $NVDA $MSFT $GOOGL $AMZN $TSLA 24:00 4) Rotation into dividend stocks to broaden rally: $SCHD 29:00 5) Rotation into other sectors to broaden rally: $XLI $XLU 31:30 6) Rotation and cool down of risk-on: $ARKK 37:00 7) Rotation from $Gold and $Silver? 43:50 8) China and Japan $HSI $NIKKEI 53:10 9) #Bitcoin bottoming out? 1:00:40 10) Rotation to #Ethereum and #Altcoins?

Cantonese Cat 🐱🐈

62,621 просмотров • 6 месяцев назад

Stop instantly rotating back. I see so many players panic and rush back to defense, only to take the worst possible rotation path. While rotations and recovery are important in solo queue, you should always take the correct rotation path before committing to it. A simple guideline is to avoid rotating to the same side your teammate’s nose is pointing. This will give you better field coverage and naturally put you into the correct rotation. Here is a player who repeatedly rotates to the same side as his teammate and gets scored on because of it.

Stop instantly rotating back. I see so many players panic and rush back to defense, only to take the worst possible rotation path. While rotations and recovery are important in solo queue, you should always take the correct rotation path before committing to it. A simple guideline is to avoid rotating to the same side your teammate’s nose is pointing. This will give you better field coverage and naturally put you into the correct rotation. Here is a player who repeatedly rotates to the same side as his teammate and gets scored on because of it.

KINSEH

29,567 просмотров • 8 месяцев назад

The North Star (Polaris) is always at the top of the Earth's axis of rotation, but that doesn't mean it's always been above the Arctic. When the Earth's geomagnetic field weakens, that indicates that the axis of rotation will flip so that Polaris switches from over the Arctic to over the Rift Valley in Africa. The consequences for human habitat are catastrophic, because the change in axis of rotation happens so fast (days) that the Earth's crust moves out from under the Earth's oceans. Low lying areas can become inundated with water for centuries, as the oceans adjust to the new rotation. This switch happens every 6400-6500 years (or so). How do we know? The great monuments of mankind that date to a period more than 6400 years ago are all aligned to a Polaris above the Rift Valley. They point to the North Star as their builders observed it during their lifetimes -- over Africa, not the Arctic. The next axis flip will be presaged by a rapid movement and weakening of the Earth's geomagnetic field, which is exactly what is observed right now. Now you're probably saying "That's some tin foil hat BS that Seager probably picked up from the Danny Jones Podcast podcast!" But you didn't spend all day with Ethical Skeptic ☀ quizzing him on his data, did you?

The North Star (Polaris) is always at the top of the Earth's axis of rotation, but that doesn't mean it's always been above the Arctic. When the Earth's geomagnetic field weakens, that indicates that the axis of rotation will flip so that Polaris switches from over the Arctic to over the Rift Valley in Africa. The consequences for human habitat are catastrophic, because the change in axis of rotation happens so fast (days) that the Earth's crust moves out from under the Earth's oceans. Low lying areas can become inundated with water for centuries, as the oceans adjust to the new rotation. This switch happens every 6400-6500 years (or so). How do we know? The great monuments of mankind that date to a period more than 6400 years ago are all aligned to a Polaris above the Rift Valley. They point to the North Star as their builders observed it during their lifetimes -- over Africa, not the Arctic. The next axis flip will be presaged by a rapid movement and weakening of the Earth's geomagnetic field, which is exactly what is observed right now. Now you're probably saying "That's some tin foil hat BS that Seager probably picked up from the Danny Jones Podcast podcast!" But you didn't spend all day with Ethical Skeptic ☀ quizzing him on his data, did you?

Thomas P Seager, PhD

147,119 просмотров • 1 месяц назад

Arteta on Martin Zubimendi’s lack of rotation: “Well, there's been more rotation than I think any other team. So in some areas there are less. I think that's the one particular one that you are mentioning, probably.” On Zubimendi struggling for form: “Well, because obviously when you play that many games, to maintain the excellent level is almost impossible. “I haven't seen a single player probably in the Premier League this season to be able to do that. So, again, it's part of that journey as a player and the shorter it is, the better.” Reporter: “Do you get the sense that he's got the kind of mentality required to get through this particular moment?” “Yeah, because he's been so consistent and so intelligent and because he demands himself more than anybody else probably.”

Arteta on Martin Zubimendi’s lack of rotation: “Well, there's been more rotation than I think any other team. So in some areas there are less. I think that's the one particular one that you are mentioning, probably.” On Zubimendi struggling for form: “Well, because obviously when you play that many games, to maintain the excellent level is almost impossible. “I haven't seen a single player probably in the Premier League this season to be able to do that. So, again, it's part of that journey as a player and the shorter it is, the better.” Reporter: “Do you get the sense that he's got the kind of mentality required to get through this particular moment?” “Yeah, because he's been so consistent and so intelligent and because he demands himself more than anybody else probably.”

Connor Humm

401,573 просмотров • 4 месяцев назад

I came, I saw, I KICKED IT'S ASS! Check out my new oam engine running in my updated Mega Man II port to the Super Nintendo! I've also included a 2nd video of the OG game in action. I'm using Metal Man's stage as a perfect example. I'm also showing the sprite viewer of Mesen, to show there is no OAM rotation every other frame, and I'm also showing my OAM buffer which is 200 bytes in size. I've removed the OAM rotation the game does, and prioritized the health/weapon bars to be drawn first. I am VERY proud of the changes i've made to the OAM engine. 🙂

I came, I saw, I KICKED IT'S ASS! Check out my new oam engine running in my updated Mega Man II port to the Super Nintendo! I've also included a 2nd video of the OG game in action. I'm using Metal Man's stage as a perfect example. I'm also showing the sprite viewer of Mesen, to show there is no OAM rotation every other frame, and I'm also showing my OAM buffer which is 200 bytes in size. I've removed the OAM rotation the game does, and prioritized the health/weapon bars to be drawn first. I am VERY proud of the changes i've made to the OAM engine. 🙂

infidelity

10,390 просмотров • 5 месяцев назад

In Figma motion, you can easily nest your animation in a frame, and use that parent frame as a camera with position, scale, and rotation. Also J and K will move the play head to the next and previous visible key frames. #figmatip Who wants a full tutorial on this concept?

In Figma motion, you can easily nest your animation in a frame, and use that parent frame as a camera with position, scale, and rotation. Also J and K will move the play head to the next and previous visible key frames. #figmatip Who wants a full tutorial on this concept?

miggi from figgi

32,420 просмотров • 1 месяц назад

🚨 JUST IN: Vice President JD Vance is stepping up at the White House today and filling in for Karoline Leavitt as press secretary at 11AM, and honestly this is the kind of rotation that makes politics fun again. JD absolutely crushed it last time because he does not walk into that room scared of the media, he walks in ready for the fight, ready with facts, ready with confidence, and ready to remind every reporter in that room that the Trump White House is not there to be bullied by the same press corps that spent years lying to Americans. Karoline has been a machine at the podium, but JD behind that microphone is a different kind of entertainment because he can take their fake outrage, flip it back on them, and make the entire room look ridiculous without even raising his voice. Now the only question is simple: Is Marco next in the rotation after JD? 🤣🇺🇸

🚨 JUST IN: Vice President JD Vance is stepping up at the White House today and filling in for Karoline Leavitt as press secretary at 11AM, and honestly this is the kind of rotation that makes politics fun again. JD absolutely crushed it last time because he does not walk into that room scared of the media, he walks in ready for the fight, ready with facts, ready with confidence, and ready to remind every reporter in that room that the Trump White House is not there to be bullied by the same press corps that spent years lying to Americans. Karoline has been a machine at the podium, but JD behind that microphone is a different kind of entertainment because he can take their fake outrage, flip it back on them, and make the entire room look ridiculous without even raising his voice. Now the only question is simple: Is Marco next in the rotation after JD? 🤣🇺🇸

ⁿᵉʷˢ Barron Trump 🇺🇸

181,637 просмотров • 2 месяцев назад

Ok, this is crazy... The US Air Force found out in 1971 that the rotation of the Earth is driven by the Earth's magnetic field. They knew that it would eventually slow down with the magnetic decoupling and the shifting of the poles. Douglas Vogt tried to warn us in 2018, and of course, he was labeled as 'crazy'. But studies in 2023 and 2024 have started appearing about the Earth's core rotation slowing down almost to a full stop. Also, NASA recently admitted that the rotation of the Earth changes due to the melting of glaciers and human-driven climate change. Of course, this is because of the geomagnetic excursion. Make no mistake, they will play this game until the very end. They will give you 'alternative explanations' and blame you for the chaos that is coming. They will give you false hope while they prepare their doomsday bunkers. This happens every 12,000 years (with smaller events every 6000 years), and I will share more proof in the comments section. You will see that Elon Musk knows, Donald Trump is aware of these changes, and the plan of the 'elite' leaked in 2010. I will continue sharing more information about this cycle while they want you to stay ignorant of this reality.

Ok, this is crazy... The US Air Force found out in 1971 that the rotation of the Earth is driven by the Earth's magnetic field. They knew that it would eventually slow down with the magnetic decoupling and the shifting of the poles. Douglas Vogt tried to warn us in 2018, and of course, he was labeled as 'crazy'. But studies in 2023 and 2024 have started appearing about the Earth's core rotation slowing down almost to a full stop. Also, NASA recently admitted that the rotation of the Earth changes due to the melting of glaciers and human-driven climate change. Of course, this is because of the geomagnetic excursion. Make no mistake, they will play this game until the very end. They will give you 'alternative explanations' and blame you for the chaos that is coming. They will give you false hope while they prepare their doomsday bunkers. This happens every 12,000 years (with smaller events every 6000 years), and I will share more proof in the comments section. You will see that Elon Musk knows, Donald Trump is aware of these changes, and the plan of the 'elite' leaked in 2010. I will continue sharing more information about this cycle while they want you to stay ignorant of this reality.

Open Minded Approach

1,537,245 просмотров • 2 лет назад

Asked Chris Finch about the adjustment in Mike Conley's role this season and what that process has been like. In his answer he talked a bit about the rotation big picture "We're getting up to the point here where we might even shrink the rotation a little bit smaller, and then everybody (who plays) minutes will level out". For context, the Wolves have been playing a 10-man rotation for most of the season, but with the 9th and 10th guys often playing between 4 and 8 total minutes. So I read that as the leveling out coming in the form of removing one guy so everyone who plays is receiving 10+ minutes a night. These were the 10 players who played tonight while the Wolves were at full-strength Gobert Randle McDaniels (got hurt tonight) Edwards DiVincenzo Reid Conley Hyland Shannon Clark (Rob Dillingham has not been in the 10-man rotation of late when the Wolves are at full-strength.)

Asked Chris Finch about the adjustment in Mike Conley's role this season and what that process has been like. In his answer he talked a bit about the rotation big picture "We're getting up to the point here where we might even shrink the rotation a little bit smaller, and then everybody (who plays) minutes will level out". For context, the Wolves have been playing a 10-man rotation for most of the season, but with the 9th and 10th guys often playing between 4 and 8 total minutes. So I read that as the leveling out coming in the form of removing one guy so everyone who plays is receiving 10+ minutes a night. These were the 10 players who played tonight while the Wolves were at full-strength Gobert Randle McDaniels (got hurt tonight) Edwards DiVincenzo Reid Conley Hyland Shannon Clark (Rob Dillingham has not been in the 10-man rotation of late when the Wolves are at full-strength.)

Dane Moore

14,193 просмотров • 8 месяцев назад

It's easier to explain why the moon shouldn't exist than why it does. All theories of lunar origin don't make sense. The moon's mass and assumed density suggest it should have settled into spherical form... with a single center of mass. Free to rotate on any axis. But the moon's rotation is completely and precisely locked to its orbital period around Earth. This implies mass is not distributed radially symmetrical. A huge anomaly. Something within the lunar crust is extremely rigid.

It's easier to explain why the moon shouldn't exist than why it does. All theories of lunar origin don't make sense. The moon's mass and assumed density suggest it should have settled into spherical form... with a single center of mass. Free to rotate on any axis. But the moon's rotation is completely and precisely locked to its orbital period around Earth. This implies mass is not distributed radially symmetrical. A huge anomaly. Something within the lunar crust is extremely rigid.

Randall Carlson

29,758 просмотров • 8 месяцев назад

Tesla's "Egg of Columbus," demonstrated at the 1893 World's Columbian Exposition, illustrated a fundamental advance in the transmission and conversion of electrical energy. Tesla's polyphase system used multiple alternating currents, offset in phase from one another, to produce a continuously rotating magnetic field. Rather than requiring mechanical switching to create rotation, the changing electrical phases generated rotation within the field itself. The copper egg responded through electromagnetic induction, spinning and eventually rising onto its axis. This same principle became the foundation of the AC induction motor and helped establish polyphase alternating current as a practical system for generating, transmitting, and converting electrical power on a large scale.

Tesla's "Egg of Columbus," demonstrated at the 1893 World's Columbian Exposition, illustrated a fundamental advance in the transmission and conversion of electrical energy. Tesla's polyphase system used multiple alternating currents, offset in phase from one another, to produce a continuously rotating magnetic field. Rather than requiring mechanical switching to create rotation, the changing electrical phases generated rotation within the field itself. The copper egg responded through electromagnetic induction, spinning and eventually rising onto its axis. This same principle became the foundation of the AC induction motor and helped establish polyphase alternating current as a practical system for generating, transmitting, and converting electrical power on a large scale.

Mechanical Knowledge

81,759 просмотров • 10 дней назад

Love that sound. This is a V10 being put through it's paces. Classic Formula 1 V10 engines (used primarily between 1989 and 2005) rotated at blistering speeds of 18,000 to over 21,000 RPM. This translates to the crankshaft spinning 300 to 350 times every single second. To sustain these speeds without literally tearing themselves apart, engineers utilized pneumatic valve systems. Instead of traditional metal valve springs, these engines used pressurized air to open and close the valves, ensuring up to 300 rapid movements per second without valve "float" Around 2001, I was involved in a project with Sturman Industries, to try and develop a camless engine for the oil patch. I met Eddie Sturman, a crazy inventor who's brain never stopped thinking about ways to improve engines. We succeeded in making a cylinder head with digital valves that could be adjusted instantly to compensate for any fuel mixture. We had 12 cylinder engines running in 2 cycle, 4 cycle, and 6 cycle. Eddie's wife would come around, and gently pull him away from his work, so he could go take a nap and re-energize his brain.

Love that sound. This is a V10 being put through it's paces. Classic Formula 1 V10 engines (used primarily between 1989 and 2005) rotated at blistering speeds of 18,000 to over 21,000 RPM. This translates to the crankshaft spinning 300 to 350 times every single second. To sustain these speeds without literally tearing themselves apart, engineers utilized pneumatic valve systems. Instead of traditional metal valve springs, these engines used pressurized air to open and close the valves, ensuring up to 300 rapid movements per second without valve "float" Around 2001, I was involved in a project with Sturman Industries, to try and develop a camless engine for the oil patch. I met Eddie Sturman, a crazy inventor who's brain never stopped thinking about ways to improve engines. We succeeded in making a cylinder head with digital valves that could be adjusted instantly to compensate for any fuel mixture. We had 12 cylinder engines running in 2 cycle, 4 cycle, and 6 cycle. Eddie's wife would come around, and gently pull him away from his work, so he could go take a nap and re-energize his brain.

Martyupnorth®- Unacceptable Fact Checker

22,238 просмотров • 1 месяц назад