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Whatcan I say? This is definitely not the ULTIMATE PVC QUADCOPTER!!You have so much wasted mass that is counterproductive in a machine that isto fly efficiently. Since the beginning of flight man has strived to keep themass to a minimum while developing flying machines.You have not followed that edict. I don’t want to declare all of yourmistakes. I would hope you and other commenters would take a very hard look atyour proclaimed ultimate design. First and foremost look at the stresses ineach and every component and any material that is experiencing zero stress mustbe removed. Yes, the tubing is a very weight to strength structure. Itmaximizes rigidity while minimizing weight. But you can still remove muchweight from these components.Another weight savings can be had by incorporating the structure that housesthe electronics in to the structure of the machine. If a stress analysis wasdone on all of these components you would find negligible stress. Granted, youwill say that they are possibly stressed in a crash situation. Yes they wouldbe. That is obvious. However in normal flight they had nothing to the strengthand rigidity of the machine.You will probably ask: How can one, one that has not the engineeringbackground, analyze stresses? Simply speaking stress is the result ofdeflecting a material.Bending your school ruler is a prime example. If you hold the ruler at eachend and apply torsion the ruler bends. Once the ruler starts bending thetorsion you applied can be replaced with just pushing force on each end of theruler. Now, study the various areas of the ruler. Where is it bending the most?Where is the curvature the greatest? In the middle, right? Where is bending theleast? At the ends, right.In the middle of the ruler bending is greatest. In the center the plastic,did I say this was a plastic ruler? In the center the plastic is beingstretched and compressed the most. Therefore, the plastic is being stressed themost in the center. We will not get into the compressive stresses at the ends.They are quite low.So since the bending stresses are highest in the center and approach zero atthe ends couldn’t material be removed at the ends? Yes, it could, in thisloading scenario. One caution we can remove material at the ends but we mustkeep in mind the compressive stress. We do not want that stress to get toohigh.That is what I mean by eliminating material that is experiencing negligible stress.This is how you can study your so-called Ultimate Quadcopter. Flex it, “load”it to see where the various components bend the least. That material could beremoved.Why go through this analysis, you ask. Why? To reduce weight. Why reduceweight. To reduce unnecessary power requirements. Why? To increase batterylife. Why. To increase flight time.Yes, Instructables is a great means of displaying ones creations. Many ofwhich are thought provoking. It should also be a platform for critiquing. Ameans for suggesting improvements on an invention. To broaden ones knowledge.I hope my comments have been and will be taken as constructive criticism. Iin no way want them to be taken as destructive.May your inventiveness continue.
Nice. Did that some 35 years ago. Used pine and finished it with Watco Medium Walnut and topped off with Watco natural and finally Watco wax. Wetsanded all coats using 400, except wax.
Now to find a dropper that produces 0.5 and 0.25 drops. They must be easy to locate.
Very very nice.I would rather use laminated wood beams for platform structure matching the wood pontoons. But to each his own.Still, your project is quite sanitary.
Steel alloys haven't changed much, so I think you meant O1 for oil quench. Then there is also A2 (air quench).Heat treatment is quite a process. Quite an art too!
I'd like to see a power ramp up routine for incandescent lights. The main failure for incandescent lights is the inrush of current at startup. This is more of a problem as the light ages. To reduce this current a ramp up of voltage over a one second interval needs to be implemented. To do this the the relay will need to be very rapidly turned on and off with increasing duty cycle over the one second. However, the mechanical relay will need to be replaced with a solid state relay. to handle the much faster cycling.jat
Why does everyone remove all of the copper not needed for the circuit?Isn't hat hard (wasteful) on the etching solution?
Improving an otherwise low precision woodworking drill jig
You make me sick!! lolThis is absolutely genus or you were wide awake in math when studying parabolas and hyperbolas. The oblique truncation of a cone creates these two curves and you realized one practical application in the resulting slice.My hat is off to you! Even though I do not where one.
Ifind this an interesting process, to say the least. I will need to do some research.I have always wondered about the manufacturing process carbon fiber and its tremendousstrength.In this process , eliminating oxygen, the “normal” oxidizer, is interesting.For example, in the stoichiometric combustion of a hydrocarbon only CO2and H2O are the products. All other products are the result ofincomplete combustion or impurities, nitrogen being one.In this process the result is quite different. CO2 and H2Odo not exist, save for oxygen existing in the bread making components.
wow, nice job! I love your thoughts in the design process.I only have a few thoughts.Why not make the gate frame another 1/4 inch smaller than the opening? The slats will cover the difference.I do not like the industries treatment process of 4x4 posts. I like what my father did to allow untreated posts. anchor 3x3x1/4 angle iron in the concrete and bolting the posts to them keeping them completely above ground. They have lasted many years. I am preparing to replace the fence and posts. A job which will be easier much with the angle iron in pace.
Nice idea! Great job.Your procedure for determining the interior angle of a polygon is interesting. There is a "cleaner" method: interior angle of polygon with "n" (number of sides is: 180*(n-2)/nHope that makes your life a little easier.Also, a lot of so called hard wood flooring is not solid but made up of veneers which are unsuited for this project.I have a nice procedure that will give a much stronger joint while resulting in less glue squeeze out.Step 1: Apply glue to both surfaces. Don't flood the surface as usual. Just apply a nice thin layer. Not too dry though.Step 2: Wait several minutes to give the let the glue time to be absorbed into the wood. Those areas where the glue is absorbed will be quite noticeable.Step 3: Apply a second film of glue to those areas where the glue was absorbed. You may want to apply a thin film of glue to the remaining surfaces to freshen up that glue.Step 4: Again wait several minutes. If no further glue has been absorbed the mating surfaces may be brought together.The results:You will find that the glue is quite tacky and less fluid. This characteristic will make it much easier it maintain align.Secondly, the joint will be much stronger in that the glue wood interface will be much greater.Thirdly, typical glue squeeze out will be reduced greatly having been absorbed into the wood resulting in the stronger joint mentioned earlier.Yes the type of glue and the porosity of the wood used in the joint plays a lot in this process. This, and the thoughtfullness of the woodworker will have a large impact weighing heavily in the result.One final comment. Taking this process to its limits I have created very strong butt joints (end grain to end grain).
Zeroing desired but not required
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