Attached is a picture of the stiffest design I printed. It's hard to see that the walls widens above the holes. Based on how the printer works, it would have been even better to use half circle arcs with the (curved side up) for the holes rather than full circle. But I didn't have time to test...
I got it! Fairly stiff and clocked in on 63,83g. The solution I came up with is creating Y-shaped walls on top of the flat bottom face. The vertical part of the Y is 3mm high, the V-part is 0.9mm high and there is a 30 degree angle in the V-split. (15 degree off vertical to each side). The...
Thinking of how to make holders for the drinking straws... Does the drinking straws need to be held so that it cannot rotate in the holders? For the one type of straws I tested, superglue just pealed off when dried.
The hole project, including other parts and 4 pieces of this part, is limited to 64g. I'm currently at 63g (including the diagonals not shown in the picture) after stripping all parts as much as I can. I hope to be able to find a couple of grams more somewhere that can be removed. So if the...
Attached is picture of the board without the diagonals. (I don't consider the X in the middle as structural.) The function of this part is to hold on to the top of some cylinders (that fits into the holes) to keep them in position. The diagonals I used for testing went through the holes, which...
I'm 3d-printing a part that is 110mm x 40mm (XY-plane). I have to keep it light weight, so I made it thin - 0.6mm (Z direction) and filled the surface with holes to remove as much weight as possible. Then I added a grid of 2,5 mm high "walls" in the XY directions to make it stiffer and a couple...
That was a nice and simple calculator! Only thing is that it shows output total for the day, not peak when the sun is shining perpendicular on the panel. So it's including the factor for sunhours in the result.
If tilt angle is changed from 80 to 40 while looking at day 355 it's basically no...
So you're saying that with panels having an efficiency of 17% they have a theoretical max output of 400w/m2 * 0.17 = 68w/m2 ? I thought the basis for this calculation was 1000w/m2. It doesn't really matter for the question of this thread though.
I'll try to rephrase my main question again: What...
In my case 2-axis movable panels has to have a lot less area than a fixed angle panel in order for the panels not to throw shade on the panel next to it. (The array has to be divided into several smaller arrays in order to have room to turn without hitting anything.)
I have not seen any...
I live at 60 degrees north. On december 22nd the sun is only 8 degrees above the horizon at noon. Here lots of people say they would go off grid if they just could have a reliable electricity production during the winter.
All the sellers of solar cells talks about maximizing the cells production...
Thanks for all the answers. I feel like I've learned more than I was asking.
This also made me wonder on more thing:
Assumed a symetric vertical foil moving horizontally with 0 angle of attack. Will it create more drag if it is half submerged than if it is fully submerged?
How will a plot of...
I can't explain why airfoils are round. It's written that the round shape makes the fluid follow the foils surface better than with a sharp front, but I don't understand why it is like that in applications where you want the flow on both sides of the foil to be equal (lift = 0). Maybe the pointy...
@A.T. : I think you're the first to compare a supersonic fighterjet with a supertanker! I'm talking about symmetrical air foils. There's not many of such in applications where lift is wanted. Symmetrical air foils are mostly used to cover objects that are pushed through a fluid (including air)...
A (displacement) boat hull has a design goal of making as little water resistance as possible with the required volume for load carrying capability. To achieve this the hull is given the shape similar to a vertical symetrical airfoil. But as the leading edge of a boat (it's bow) seems to be made...