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    [–] In case you ever wondered how large an eagle claw is. newtoon 20 points ago * (lasted edited 15 days ago) in Damnthatsinteresting

    You wouldn't believe me if I seriously say that THIS IS A DINOSAUR (as any bird)

    (but it's in Wikipedia, folks : "Based on fossil and biological evidence, most scientists accept that birds are a specialised subgroup of theropod dinosaurs,[" )

    [–] A brief history of physics newtoon -7 points ago * (lasted edited 15 days ago) in funny

    In the appropriate limit, we are a just meat.

    Just having fun here, but no, Newton was really wrong because Einstein's theory is a complete change of adressing the problem. Another vision (specialists say "paradigm" but I won't). It's not an "add-on" in any way.

    [–] A brief history of physics newtoon 60 points ago * (lasted edited 15 days ago) in funny

    If it's true that majority of Mechanical Engineering is based on Newtonian physics, it's just because we are lazy and don't want to mess with his equations for "mundane things" and for the sake of unwanted precision.

    BUT Einstein did prove Newton was WRONG.

    Einstein's concept is not a "added detail". It's a complete revamp of how the world works. Hence his Name stayed in History. If it was only for "details" (like GPS or Mercury orbit), his name would be of minor importance...

    Note : Now, Einstein was well aware that even his theory would eventually be shown to be wrong too. We already know it because we still cannot apply his findings to tiny things, where quantum theory applies.

    [–] I'm designing a micro hex frame. What do you guys think? newtoon 1 points ago * (lasted edited 17 days ago) in Multicopter

    Ah ! Ok ! Thanks for the details. Did not know that you would 2D cut and that's only a prototype. It's just that I have seen so many quad 3D printed models with flat arms... I don't understand this way of designing. Good luck !

    PS : what are the components list btw please ?

    [–] I'm designing a micro hex frame. What do you guys think? newtoon 1 points ago in Multicopter

    Especially when it is a shame that one designs for 3D printing like it would be cut in 2D. You can have round arms. Why making them flat ! ?
    Regarding the upper part, there should be grooves and holes to shave at least 10 gr.

    [–] Need advice when the drone is too far and I lost orientation LOS newtoon 1 points ago in Multicopter

    Better you learn LOS with very cheap very light toy grade. Your brain will find tricks by himself. Anyway, with heavy quads, comes high voltage, so a 7.4V or 12V LED in front can be seen from far away. You just have to implement that ASAP.

    [–] What have you made with arduino that's actually useful and that you use a lot? newtoon 1 points ago in arduino

    I have a Music big vertical Vu meter (with microphone). I often plug it on when playing "loud" music in our apartment so as to "vizualize" music. I like my 3dprinted design and "special effects" it makes.

    [–] Kids in the future probably won’t make engine noises when they play with toy cars, cuz all the cars will be electric. newtoon 1 points ago in Showerthoughts

    Anyway, I can tell you my opinion. As a pedestrian, I was sometimes very surprised (small panic) with slow moving hybrid cars. You don't hear them at all when they start (acceleration). You don't have this issue with gasoline cars ; you hear the motor.

    Regarding tire noise, it's mostly after 20 miles an hour that you hear them above the engine noise (depends if it had rained or not).

    [–] 2.5" 1S LOS quad newtoon 3 points ago * (lasted edited a month ago) in Multicopter

    Hi bexamous !

    Have been on the same path (but with FPV : 55gr AUW, 1S) : I built a 120mm Tweaky like you one year ago.

    Old picture before FPV :

    For everyone, this is a lot of fun and even my favorite quad since I can play everywhere (completely silent).

    Used 1104 8000kV with 3 inch triblades props. Could fly very fast on beaches with 30km/h wind and nobody even noticed it flying above their heads !

    Uses a Happymodel Trainer90 board. Changed recently to a 120 degres FOV camera. I dislike large FOV in flying : the "world" seems too distorted and "things jump to your face" at that 40 km/h speed ! May post a video very soon.

    [–] I'm having an argument with a guy on another sub about how quiet a quadcopter can get. I said not very quiet. He seems to think that they can get fairly quiet. newtoon 1 points ago in Multicopter

    It has been several years that I build quiet quads. Because I don't like the noise of performant quads (personal taste). So, you have to :

    1/ lower the weight as much as you can, 2/ don't block airflow (arms profile for instance) 3/ lower the kv of the motors 4/ Use 3 / 4 or even 6 blades props (a bit extreme) + High pitch

    The best I did was with a 1S 3 inch quad (1104 / 8000 kV). You can barely hear it, and performance is incredible. But my 5 inch / 1900 kV 4 blades props is very quiet for its size (cruiser, not racer).

    [–] The entirety of Carl Sagan's Cosmos: A Personal Voyage (1980), in a convenient playlist on YouTube! All 13 episodes. newtoon 1 points ago in Documentaries

    That's true but there is another and more important myth : Galileo was not persecuted because he was saying that Earth was not the center of the universe. It was more because the man was very stubborn and did not follow any advice of his friend, the Pope himself, when facing the members of the Church and their theories. He tricked people and mocked them and did not even have serious scientific proof on certain ideas he had (like how the tides work). The pope was bitter that his friend had such a behaviour and had to abandon him to his fate (on politics ground) .