Simple Sketch in .f3d, link to file on Google Drive.

https://drive.google.com/file/d/1XHI33SnpzdzgjLyLbXWCsXECCd0Ql1Nk/view?usp=sharing

Change the Parameters for inner and outer diameter(D1 &D2), and angle of attack(AoA) at the hub to find the desired angle at the tip.

https://preview.redd.it/jbp1g0c3xrb81.jpg?width=1863&format=pjpg&auto=webp&s=0af7c7463d8ef2592ce2b4359e5a52b6ec5e0a2f

Im working on this plane and, i want to use blade pitch to control the speed. Right now i use a throttle lever, but i want to be able to use the up/down keys too. So is there a simple way to combine the 2 signals?

So, we have a few bandsaws at work with varying blade sizes, such as 1.4/2 and 2/3. I get that the higher number the more teeth on the blade, but what does each side of the fraction actually equate to please?

Or is there a chart/graph online somewhere that someone can link for me please?

Thank you!

For those who are unaware, a retreating blade stall is a scenario where a helicopter's rotor loses lift at a certain speed (around 350 kph in the hind). It's caused by the blade being unable to generate lift in the area that it is traveling backwards relative to the aircraft, because the speed of the blade is too low compared to the relative air speed. This affects the lift on one side of the helicopter (in this case the right side), as the other side of the blade's motion travels forward. With this, you might assume that a retreating blade stall would cause the helicopter to roll, since one side is losing lift HOWEVER thats not the case, in theory at least.

There's another effect at play called gyroscopic precession. This principle states thatany force exerted on an object in circular motion will be applied 90 degrees in front of the object along its plane of motion, due to tangential angular momentum and a lot of other physics magic. In practice, this means that if you exert an upwards force on the left side of the helicopter blades, the force is applied 90 degrees ahead along the plane of motion, pitching the helicopter up, instead of rolling right like you might assume. This is why if you watch the rotors of a helicopter, you'll actually see the blades pitching perpendicular to your inputs.

Remember that a retreating blade stall is a loss of lift, AKA a decrease in the upwards force exerted on the blade or a negative force, and since any force applied to the blade is exerted 90 degrees forward, the loss of lift would be applied to the tail end of the blades plane of motion, causing the helicopter to pitch up, not roll. A retreating blade stall therefore acts as a physical limit to the aircraft's top speed since as you enter the stall you're forced upwards which causes a deceleration.

This is modeled in the other rotary aircraft in DCS to my knowledge, but not the hind, which still rolls right during a blade stall. Is this a mistake on the development side, or is there something special about the hind that causes this?

Hi, we think we made an educational entry to #veritasiumcontest about Why wind turbines pitch. Please, have a look: https://www.youtube.com/watch?v=kAyWnb15thk

(we are very close to making the cut for the next phase...)

I am trying to write total pitch of a blade such as

total pitch = collective pitch - r / R x twist + lateral cyclic x azimuth + longitudinal x azimuth

However, collective pitch in papers is given at 75% of blade span. They even talk about collective pitch at root. Isn't the collective pitch constant along span of a blade? If not, is it because the blade is flexible (not completely rigid)?

Maguire, Walker and DCL subbed on for Kane.

Fucking love it. Made in Sheffield ⚔🏴󠁧󠁢󠁥󠁮󠁧󠁿

See new listing: https://www.reddit.com/r/DigitalCodeSELL/comments/nbq6kw/selling_deadpool_2_4k_deadpool_home_alone_gone/

I had an idea where it basically stars Oscar Isaac as Detective Winston Eckhart, A New Blade Runner Before Officer K and after Deckard in 2036 who deals with the aftermath of the Nexus Dawn while having to cope with the loss of his daughter (in flashbacks played by Saoirse Ronan). Meanwhile, He is assigned, like Deckard, to kill replicants and save one girl named Elena (played by Katherine Langford) who is an innocent girl and has nothing to do with the actions of her colleagues. But after Eckhart saves her, they are both skeptical at first of being together as Eckhart reveals her to just be a replicant all along and never a human, (I'll admit this obviously came from the original scene, but stick with me here) ultimately making her think what was her point of being happy when she isn't.

But later on, they develop a father-daughter bond. But however once he confronts her colleagues, he eventually realizes that they were only building a great future for her and try to redeem themselves from what they did in the past and also get her away from the corrupt department that Eckhart works for before dying. After they're passing, Winston seeks to attack his own colleagues and right his wrongs as he realizes he has always been on the wrong side. As he basically kills almost everyone, one corrupt cop shoots Eckhart and basically kills him. After, He and Elena escape, as Eckhart knows that he's now dying, He plans to send Elena away and start a new life before dying in the way he wanted, peaceful wind and a sunrise around him.

Cast:

Oscar Isaac As Det. Winston Eckhart

Katherine Langford As Elena

Saoirse Ronan As Eckhart's Daughter

Tom Hardy As Elena's Replicant Guardian

If you thought this wasn't good enough write down an idea what is a better idea?

Check 4ksheet for the HD titles as I know some will redeem in 4K on iTunes.

Offer:

• Sony Buff Pass (4K)* (Selections at bottom of post)
• Universal Rewards** (Selections at bottom of post)
• 2001: A Space Odyssey - (4K) MA
• Bladerunner 2049 (4K) - MA
• Bladerunner Final Cut (4K) - MA
• Daddy’s Home 2 (4K) - iTunes
• Dunkirk (4K) - MA
• Evil Dead (4K) - 1981 - Vudu/FandangoNow
• Goodfellas (4K) - MA**
• Hell or High Water (4K) - iTunes/Vudu/FandangoNow
• Hidden Figures (4K) - iTunes
• Inception (4K) - MA
• The Girl on the Train (4K) - iTunes
• The Great Gatsby (4K) - MA
• The Matrix (4K) - MA
• The Matrix Reloaded (4K) - MA
• The Matrix Revolutions (4K) - MA
• The Mule (4K) - MA
• The Shining (4K) - MA
• The Wizard of Oz (4K) - MA
• Bring It On Worldwide Cheersmack (HD) - MA
• Mechanic Resurrection (HD) - Vudu (it4k)
• Onward (HD) - MA
• Oz The Great & Powerful (HD) - Vudu
• Rocketman (HD) - Vudu (it4k)
• Star Wars: Force Awakens (HD) - https://redeemdigitalmovie.com/
• Suicide Squad Theatrical & Extended Dual Pack (HD) - MA
• Yesterday (HD) - MA
• Beauty and The Beast Live (SD) - GP
• Cabin in the Woods (SD) - Vudu
• Safe (SD) - iTunes
• The Hunger Games (SD) - https://movieredeem.com/ iTunes/GP/Vudu/FandangoNow
• The Jungle Book 2016 (SD) - GP
• Think Like a Man Too (SD) - MA

Collection:

• Friday the 13th 8 Film Collection (HD) - Vudu

Requests:

• Words on Bathroom Walls
• Lighthouse
• Alien Anthology
• Chronicles of Riddick
• Pitch Black
• Belly
• Your lists

* Sony Buff Pass (MA redeem)- Choose one of Alpha 4K, Angry Birds 4K, The Dark Tower 4K, Holmes & Watson 4K, The Night Before 4K, The Possession of Hannah Grace 4K, The Star 4K, Zombieland 4K, The 6th Day, Anger Management, Don't Breathe, Grown Ups, Searching, Stuart Little, Surf's Up

**Universal Rewards Selections - Choose one of Larry Crowne, Closed Circuit, The Adjustment Bureau, Battleship, or American Reunion. All options are HD.

Hello everyone. I do not know a ton about aerodynamics, but I am having a small-go at designing a new Fan Blade for a Youtube Competition hosted by "Major Hardware". He's a mechanical engineer and does small PC mods using 3D printing in his free time.

Right now, I have this little 7 bladed fan design that begins from the hub with an 70 deg pitch and ends at the wing with a 20 degree pitch. The fan motor will be running at 2000 RPM. The length from the outside of the motor's hub to the outside fan enclosure is approximately 34mm, and the blades are limited to 15mm in height.

I know that propellers and fan blades generally have an optimum pitch range that are proportional to the speed of the motor, and that these ranges will change based on different factors, such as incoming wind, thrust, altitude, etc. However, in my context, this propeller/fan design is static and in a very controlled environment (typically indoors mounted on electrical hardware), so these factors are negligible to the pitch calculations.

I was trying to find how to calculate the optimized pitch angles for my blades based on the height and length, but I could find nothing. How would you do this?

Side question: Does more density in a propeller blade give better performance? I can adjust the infill density when 3D printing if it does.

Thanks!

Also, how often do you clean them?

(Before I begin, I would like to remind everyone that these are designed the topic look as bad as possible. My real thoughts are at the bottom.)

Producer: So I hear you have a new novel for me?

Writer: That's right and it is called "Blades of Light and Shadow. It's a fantasy story, but like an RPG where you can collect weapons and gain experience.

Producer: I'm not sure about that. That sounds like a lot of effort.

Writer: Don't worry, it's not that hard. And I have a great idea! There are three main species: Humans orcs and elves.

Producer: No dwarves?

Writer: Well, they exist, but we're not focusing on them at the moment.

Producer: Fair enough. So I suppose that orcs are strong, elves are fast and humans are versatile?

Writer: Actually humans have the superior speed, but elves have the superior senses.

Producer: Really? That honestly seems to be kind of random to be honest. In fact it should be reversed if anything.

Writer: I don't think so. Humans are often considered to be more agile than elves. It's a basic law of fantasy.

Producer: My mistake. Can you tell me about the species?

Writer: Of course. I'll start with my favorite, the elves. I pretty much made playing as an elf the best thing you can do. It's the optimal choice.

Producer: What if I want to play orcs or humans?

Writer: Eww. Why would you want to play an orc? They're ugly. And humans are so boring. We don't even have pointed ears!

Producer: We're not that bad.

Writer: Yes we are! That's why I will reward you for being an elf! You will be more central to the plot and have more special actions you can take! Besides, I bet the players all want to be elves anyway.

Producer: Well, if they all want to be them...can you tell me about them?

Writer: Of course. These elves have an affinity for magic, used to rule a vast empire, but several evil elves had to be banished to another world, starting their downfall and allowing humans to rule.

Producer: So like Dragon Age?

Writer: What?

Producer: Yeah...I mean that sounds pretty similar to Dragon Age.

Writer: Err...Oh, the orcs are all big and strong...and everyone hates them!

Producer: I see, so everyone is wrong for judging the orcs without getting to know them?

Writer: Of course they are! It's not fair to judge orcs just because they come from a nations of pirates.

Producer: Nation of pirates? Um, that sounds bad.

Writer: Well, not every orc is a pirate. But they all support a nation of people who plund