I am making a rotorcraft that has two petrol engine powered rotors. Obviously to prevent torque induced spinning I need the two rotors to spin in opposite directions. Can I simply start one engine in the opposite direction without any problems? From what I have gathered this is possible with two-stroke engines but not four-stroke. Plan B is to duct them and use control vanes.
>>940067 >This because you can't reverse even a two stroke engine. I think you can with total-loss 2 strokes, if you can change the ignition timing. With small engines it's just a dynamo. There may be ventilation issues but that's minor.
The reason you can't do it with 4-strokes is because the valve order is basically fixed by the camshaft. Simple 2-strokes got no cams, just reed valves
"Modern" 2-strokes are closed-crankcase, and have... Comment too long. Click here to view the full text.
I recently got four of these crappy 13w LED lamps for free. I want to power them but I don't have any inverters. They say 85-277V AC so couldn't I just plug them in to some GX24 bases and wire them up to a wall socket adapter? House voltage in the USA is 120V correct, so it should be just fine...I'm checking here first because I don't want to start a fire/electrocute myself etc.
Anyone keen on helping make me this space more hospitable? I bought this place 3 years ago and have the kitchen/dining, living, and bath rooms un-bachelorish. But,honestly, I am just stumped in the bedroom. I just got the bed off of the floor last month (and I have a skirt for it somewhere). When I scoped the place out, they had some sort of fabric lined board against the wall (as a sort of head-board) that had lights (sconce) attached to it. I'm guessing that they were plugged into a socket behind the board thing (not hard wired). I thought that was a good look. Anyways, I want to get rid of the baby TV, put one at the foot-board wall of the bed, and... that's where I'm stuck. There is a 3/4 bath to the left of that mirror that needs to be put back up on the bedroom door, and a sliding two-door closet running next to it on the same wall. I'd prefer not having night stands (not a lot of room for them), but I'd like some light besides the overhead (dimmable). I can't hardwire stuff without massive amounts of cursing, fixall, and tears. I have a drill. And a ladder. I know enough about DIY and home improvement to know that I shouldn't go it alone. I can show more pics, but it's pretty much this square.
>>939525 Your text is hard to read if you are not trolling, so basically you want us to decorate your room, you need to show us more pictures and tell us the size of the room and the windows and the door and how many people sleep in it, etc
Well here goes. I'm looking for a tool / drill attachment that I could use for routing a hole 1" deep by 2" across. Any idea what I might need to ask for? Don't want to make a fool of myself when I go shopping later.
What do you know about loupes ? My eye are getting weaker. would like to work on things at arms length and have a close up look. Been looking at dental loupes but they super expensive. Regular jewelers loupes work fine but you have to hold the work right up to your face. What I need is a close focusing binocular you can wear . What's out there?
>>938459 >Regular jewelers loupes work fine but you have to hold the work right up to your face. That is because they are far easier to use that way.
The practical problem with using devices such as loupes is that- 1) for a given objective lens size, 2) as the magnification of the lens assembly increases, 3) the depth of field decreases. As it must. There is no way around that.
The reason that a typical 30x loupe requires you to hold stuff 10mm in front of it is because... Comment too long. Click here to view the full text.
Hey /guys/ I got some basic experience in building stuff and handling tools and electronics etc. Now i wanna make my own VR Headsedt. It shouldnt be cheap like pic related, but include headphones, a small mic and yeah, a screen (or however you want to call it). The screen will be divided in 2 parts by some software and i'll buidl a seperation between those two that i can see the 2 parts seperately. Now my problem is: I need a ca. 4.5-6.5 inch screen (i guess, havent figured that out yet) that is quite affordable. It should have HDMI/VGA/DVI compability, if you got... Comment too long. Click here to view the full text.
>>939767 I set one up to work as a radio in my room. There's nice aesthetics on some of those, especially when you prefer analog radios to digital ones for that comfy feel. Mine in particular is a Sherwood CRD-90; I can't even find a picture of that online. It makes it feel really personal.
I am looking to do some mold-making at home using silicone for molds and resin for the casting material. I design figures/vinyl toys/custom console shells as a hobby and want to get more serious about it. I have done so successfully with some kits from Hobby Lobby (Gotta love those coupons) but long term it is not a viable option.
I am looking for websites that sell from the US for casting resins. The one that seems the most useful is the EasyFlow 60 casting resin. My only issue is that molding and casting shells for handheld game systems means the plastic has to not... Comment too long. Click here to view the full text.
Sup /diy/. I stole a stolen shopping cart out of the ditch the other day and i want to motorize itwith an old pushmower engine but because the pto is vertical and the wheels (which will be replaced) are horizontal plus on top of that i need a way to engage the wheels and give it variable power.
>power to the ground You'll need to either add wheels or replace the rear ones with some kind of axle setup. At the simplest you could have a gear mounted on the axle with a matching worm coming from the engine.
>variable power to the ground A gearbox of some sort is really your only option without modifying the engine to have some kind of throttle control. A small used tranny could be picked up for relatively cheap at a local junkyard, or a throttle body even cheaper.
>>937149 Not a problem. Before you go out and drop $100 on a tranny though, make sure you can fabricate some kind of coupler to connect the two. It should also go without saying that you'll need a manual one unless you're a master at electromechanical wizardry.
>>939882 You cant tighten them as in you can't force them into the material any more than you have, or that they just pull out immediately? If A: Try harder or go buy a drill or impact driver or something and force that bitch in. If B: Take the bolt out, goto the hardware store, and get one slightly larger.
can someone please explain to me how these things actually work? all the instructions i've found online so far have just left me with more questions than answers
the arduino libraries allow you to daisy-chain them together and address each one individually. how is that possible? from what i understand so far, the only control signal they accept is a 24-bit RGB value. there's no back and forth communication with the microcontroller. each one has only one input and output, so how can they be individually controlled if all they do is accept a value and then hand... Comment too long. Click here to view the full text.
>>939613 If you check the datasheet for the ws2811 ic that is used you see that you send three bytes and that sets the first pixel. The next three bytes the first pixel is already set so it sends them to the next in line. A reset resets everything.
At first I thought it was just a shift register type deal but the datasheet is such shit engrish its one way or the other.
So not exactly addressable, you have to throw everything out and reprogram all of them to change one led
Simple. You send a string of 24 bit values to te first LED input. Each 24 bit 'word' is 8 bits each of RGB values. The first LED picks the first 24 bits off the string and sends the rest to the daisychained LEDs. Each one picks 24 bits off and sents the rest on.
So you can set each LED to a unique RGB value. You cannot send a single RGB value down the string addrressed to one LED in the middle. You have to pack the string with at least... Comment too long. Click here to view the full text.
>>939625 >>939627 thanks for the responses, it makes a lot more sense to me now.
so if i'm interpreting this correctly, each LED has a 24 bit input buffer that retains its contents temporarily so long as it's receiving a data/clock signal. once the buffer is full, the overflow gets passed to the output until the signal stops, then the buffer automatically clears after a specified period
for example if you had three leds you wanted to first make red, green,... Comment too long. Click here to view the full text.
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