My favorites:
https://www.youtube.com/watch?v=5aMzOPtNjKo
https://www.youtube.com/watch?v=ouAXAD5GxCs
(very) Similar thing:
https://www.youtube.com/watch?v=Okw4i5etjEs
(I haven't watched it, because I don't like relays...)
This is meh another relay thing... In fact I wouldn't even vote for myself :)
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https://www.flashinglightprize.com/
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https://www.youtube.com/watch?v=vCd8ORq_maU
I was cleaning up acetone I use for cleaning and drying glassware, and suddenly some waves appeared in condenser. It was quite overloaded.
Title is rhetoric question. You are not obliged to answer :P
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https://www.youtube.com/watch?v=F4yMCOqlHBE
Following writeup from http://www.sciencemadness.org/talk/viewthread.php?tid=10256
Impressive how this ~8h process can be fit into such short video...
Ideally I would try to "postprocess" crude benzaldehyde with hexamine here, but I didn't have any handy. also I will probably do a bunch of experimentation here, to try to optimize overall procedure and there is only so much time I can fit in 1 week.
In any case good enough for a vid I would say, so it's out.
Short version notes:
214ml of the benzyl/benzal chloride/trichloride was placed in the 1L 3-neck flask above, 405 ml 32% HCl was added, followed by 135ml of distilled H2O, which leads to about a x10 excess of H2O in 25% HCl. The contents were refluxed with the reflux temperature at 106C - this is the same temperature mentioned in the patent, but what is important is that it self adjusts- there is no need for a fixed bath. The reflux took 6hrs at which stage HCl evolution ceased, as evidenced by cooling of the absorber bottle and no more NaCl crystals forming on the surface.
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https://www.youtube.com/watch?v=gCqxxGu-yAc
Overwiev of few generators and kinda simplified explanation how those work.
I was thinking about making some ozonolysis video, because I can not find some "quickstart" on that subject. That may be because it is not as simple as it looks like...
Few resources:
Corona discharge - https://en.wikipedia.org/wiki/Corona_discharge
Dielectric barrier discharge - https://en.wikipedia.org/wiki/Dielectric_barrier_discharge
Note that those generators will form NOx gases.
Sorry for crappy naration - I realy have to train this a lot. The last few minutes of my speech was simply unusable so Daisy completed this vid for me.
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https://www.youtube.com/watch?v=orycFbuxWNs
I have seen a lot of crappy linear guides. This is another one, I have not seen anywhere on internet.
I am expecting this to have properties:
-very rigid for in-plane load and for load from top
-not so rigid for load from bottom
-inefficient sliding
-but I expect long life due to high contact area if protected from abrasion
-positioning precision should be better than 0.1mm per 10kg of load for one block
-easy to setup in pair config.
However none of these stats may be true - tests must be done
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https://www.youtube.com/watch?v=Pu9p0hniV5o
This is what I do every day before I go to work...
I lost Medivh this way few years ago, so I am more careful now.
Also my coolant level seems to be low
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https://www.youtube.com/watch?v=fHlrNtY6hmk
I want to share my experience of building airframes. I made a lot of these and still I think there are things optimize and improve. My point is, if you want to get into this sort of thing, let this be an inspiration of what is possible.
Also check out https://www.youtube.com/c/iforce2d - dude makes bit more involved build vids, they were very helpful.
Now you may say, that hardware stores don't usually stock carbor fiber composites... That's correct. I don't think I would be able to find any replacement for that, but for lighter planes you can use wooden reinforcement too, it's just no good for rough handling of course. Also that is not quite point of this video.
Technical stuff:
Using 2830 1100KV motor, 8x6 prop
Efficiency of this plane is 1.12W / kg*km*h^-1
With smaller wing, efficiency was 1.34W / kg*km*h^-1
Now I am thinking, that having canopy could push this under 1W per weird unit, that would be quite nice, but still it wouldn't be too amazing.
Perhaps 1300KV motor can improve this even bit more...
Consider, that with 76Wh battery and 0.8W / kg*km*h^-1 this plane would fly nearly 100km. That is actually quite impressive. Hmmmmm I am thinking about getting 4G controll link now :)
Bit of back story:
So I was like 15 walking on the hill and I wondered how much power do you need to fly? Can you human powered plane that would support your weight?
Tl;dr: it depends a lot (mainly on weight and speed) you need like 5-10kW at least with ultraultralight airframe assuming no other energy inputs like thermals and reasonable speeds of ~80km/h. So no, not really
Now I live in quite busy airspace, so one day I saw a plane flying near small airfield and I decided to learn more about plane design and make my own and learn basics of flying and stuff. So I read some stuff, watched some videos, and started experimenting.
Designing planes is easy: as long as center of gravity is correct, even brick can fly. Technically flying is easy too. My mistake was to make 3 channel plane with rudder as sole yaw/roll control. This is OK so far as you make plane that is good. When you are experimenting, there is great chance of getting into spirals which are sometimes impossible to recover from, because, this is what happens when you use too much rudder. It may seem obvious to you as now it is to me, but it is not obvious at all - I never heared anybody ever mention it. That could save me few months of "research"... Hell even now I would probably suck at proper coordinated flight.
The reason why I wanted to use rudder is that the construction is much easier that way. Making V tail with just 2 servos is really super quick, and I think it is even more durable. So it is really tempting to skip making ailerons alltoghether. You may think that you would be able to iterat
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https://www.youtube.com/watch?v=y_1LdM3l6-k
Electrical installation mostly done, at least enough for inspector to inspect... Question is will it pass? The answer may probably surprise you as much as it did me :D
I will be doing water analysis very soon and then I will do bunch of masonry, which will be boring af. But I will need to construct water and waste infrastructure inbetween so will try to document that.
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https://www.youtube.com/watch?v=u_E7PrV5AoE