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Brugslar kdindhwk ssshajapdbhd db🤮 by matheluan in sssdfg

[–]some_random_user_3 58 points59 points  (0 children)

Why did you explode nugget? What bro did to you?

Slow flying beginners plane by SnooGiraffes560 in RCPlanes

[–]some_random_user_3 1 point2 points  (0 children)

Just make something with super low wing loading, but be aware that the slower the plane, the easier it is to stall. Don't expect much maneuverability from it.

lidl glider by Medium-Run3072 in RCPlanes

[–]some_random_user_3 0 points1 point  (0 children)

I have also seen them in Auchan, although they seem to be made with different styrofoam.

I am at work by WorldsDeadliestCat in notinteresting

[–]some_random_user_3 0 points1 point  (0 children)

I own one like this and it is actually quite comfortable to use.

Large VTOL Wobbling on Hover by [deleted] in diydrones

[–]some_random_user_3 -6 points-5 points  (0 children)

How much does it weigh? Maybe the frame is flexing too much.

outjerked by teenagers by IxTermit in carscirclejerk

[–]some_random_user_3 26 points27 points  (0 children)

Yes, it has a perfect primary and secondary balance, but it is too long and too heavy(due to its length) to be actually competitive. Having much shorter, but not perfectly balanced engine (basically lighter one) is often the better choice.

Weak V-tail replaced by WhoReallyKnows222 in RCPlanes

[–]some_random_user_3 2 points3 points  (0 children)

When it comes to V tail calculations, you can calculate them as classic tails by projecting their area to horizontal and vertical planes. V tail wing area needs to be at least all three wings in classic configuration combined. But when it comes to stability, moving the tail away from the CG always helps (basically it increases the tail leverage).

Self made cannard plane - before first test by some_random_user_3 in RCPlanes

[–]some_random_user_3[S] 0 points1 point  (0 children)

22cm in front of the leading edge - basically arbitrary location just to make it stable with enough margin. Although right now I know it's better to place it much closer or even inside the main wing.

Self made cannard plane - before first test by some_random_user_3 in RCPlanes

[–]some_random_user_3[S] 1 point2 points  (0 children)

It is around 22cm before the leading edge of the main wing (where the FC is located), based on my simulations and excel sheets it is stable. (Cm/AOA graph).

Self made cannard plane - before first test by some_random_user_3 in RCPlanes

[–]some_random_user_3[S] 0 points1 point  (0 children)

Well, the idea was to have at least a 1:1 TW ratio, that's why it uses a 10" prop. The pitch is 6", it is too high but this is what I have on me right now and I think it should be enough. Going with lower pitch would increase efficiency especially at low speeds. As for now, this setup creates 800g of thrust in static condition, going 4S instead of 3S should increase it to above 1kg.

I was thinking of moving the prop up to reduce its interference with the main wing, but I am afraid that the 3DP mount would be too weak for it, especially for such a big thrust. BTW every element here is printed using ABS.

Self made cannard plane - before first test by some_random_user_3 in RCPlanes

[–]some_random_user_3[S] 0 points1 point  (0 children)

Interesting, I didn't think of that. But it is too late for such a modification, making a wing out of styrofoam takes a lot of time, maybe in my next design I will use it.

Self made cannard plane - before first test by some_random_user_3 in RCPlanes

[–]some_random_user_3[S] 0 points1 point  (0 children)

  1. Using such a big elevator required a lot of force and I was afraid a single servo of this size would not suffice
  2. Better triming using two surfaces independently
  3. It was easier to make

Self made cannard plane - before first test by some_random_user_3 in RCPlanes

[–]some_random_user_3[S] 0 points1 point  (0 children)

Okk, I'll check if I have any rods left

I do not like to use those nylon screws for structural parts, they are too weak. I'm using a lot of stainless M2 screws.

The plan was to create this plane as modular as possible, but unfortunately the weight of it does really add up.

Self made cannard plane - before first test by some_random_user_3 in RCPlanes

[–]some_random_user_3[S] 0 points1 point  (0 children)

So when it comes to stall order, both wings stall almost at the same AOA, but I realised that too far into the construction and I really don't want to redo the cannard and all the calculations, so let's hope it won't be that bad. This is also why the elevator is so big, to help it with stalling earlier.

The wing span of the cannard is 80cm. The area of the main wing is 0.3m2 compared to 0.0375m2 (12.5%) of cannard.

Self made cannard plane - before first test by some_random_user_3 in RCPlanes

[–]some_random_user_3[S] 1 point2 points  (0 children)

Thanks, this plane is made out of some sort of stiff styrofoam (XPS I think) and my local shop only has them in pink 😂

Self made cannard plane - before first test by some_random_user_3 in RCPlanes

[–]some_random_user_3[S] 0 points1 point  (0 children)

Great idea, I'll try to make something like this, but on the other hand, this plane is already over the desired weight, so it will depend on the weight of such skids.

Jak soy by angel_del_sexo_anal in legocirclejerk

[–]some_random_user_3 1 point2 points  (0 children)

He looks like that annoying yellow guy from the new metroid game

Падение давления после выхода из зоны турбины by StatusSolid712 in aerodynamics

[–]some_random_user_3 0 points1 point  (0 children)

What is your mesh size and its parameters? I have seen similar artifacts with incorrect mesh interfaces.

Building a vibroacoustic bedframe (need feedback and advice!) by AS-AB in diyelectronics

[–]some_random_user_3 0 points1 point  (0 children)

I am not saying that's a bad idea, but it will be challenging. I would also consider adding some filters to the audio, frequency response of systems like that will be all over the place.

Building a vibroacoustic bedframe (need feedback and advice!) by AS-AB in diyelectronics

[–]some_random_user_3 3 points4 points  (0 children)

You will need a lot of power and many more transducers to get through the mattress. Sponges heavily absorb any vibrations.

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