How Do I Calculate the Thrust Produced by a Propeller and Motor Combination in a Quadcopter?

I've been using this tool extensively and its very accurate; the most reliable RC Calculator on the Web

1. What material helicopter propeller made of?

well they have been made of wood. Mostly today though they use a main spar of steel or titanium, overlaid with a composite such as Kevlar to give it the proper shape. Some have gone to Fully Composite but these are relatively new.

2. How to design the blade twist angle in propeller design?

I do not think performance will change, wether you use trailing edge or leading edge or somewhere in between reference for twisting. What matters is radial airfoil morphing along radius and common sense mass distribution around centripetal constraints. following those you wont come up with a straight twisting reference line. Have a look at APC model propellers site, it may help

3. Would running the air thrusted by a propeller through a cone that gets smaller at the end have any effect on the thrust generated by this system for the aircraft it is attached to?

Yes. See Ducted fan - Wikipedia

4. If you were to build a 4 engine (propeller), 6 pass., exp. aircraft, what engines would you use? Why?

can not answer that until we know the airplane's mission -- what problem are you trying to solve that will need that much lift with so few seats?

5. Which single engine propeller plane has the most passenger seats?

I say caravan too. Although the de Havilland Canada DHC-3 Otter can also carry 14 pax

6. Is Parallax Propeller a good product? [closed]

Another multicore option is XMOS - 1600 MIPS from four cores, with eight 100/50 MIPS hardware threads per core. They start at $7.50 for a single-core 400 MIPS QFP device. The (excellent) development tools are free.Leon

7. How many tendencies are affected by Gyroscopic precession for single propeller airplane?

Both are wrong. (Or rather, both are partly right, which makes them fundamentally wrong).Precession happens when there is an 'input' rotation (moment) and not by itself. When you balance the airplane to fly straight and level, there is no gyroscopic moment. The gyroscopic moment is perpendicular to the external rotation, so it can be directed anywhere across the spin axis.On a typical airplane with the CCW prop (or turbine for that matter), if you yaw (or turn) LEFT, the airplane will want to pitch UP. (See the diagram on your picture). If you pitch UP, the airplane wants to turn RIGHT. If you pitch DOWN, the airplane wants to turn LEFT.1 And so on. The quicker you maneuver, the stronger the effect is. (And of course, the quicker and heavier the prop is, the stronger the moment, so it's most noticeable at full power). In normal flying with GA airplanes, the gyroscopic moments are rather minor. The typical 'left turning tendency' is caused by aerodynamics. Gyroscopic moments manifest themselves when rotation is relatively fast, e. g. in aerobatics or spin. But they can be observed with quick impulse inputs on the pedals or yoke, if carefully executed.1This latter is particularly noticeable on taildraggers during takeoff when the tail is lifted too quickly: the aerodynamic forces are still weak, and the power is full

8. What is the difference between a normal airplane propeller and a turbine engine?

I think your asking why all planes do not use props?? Big planes rely on huge gas turbine engines to rotate a huge fan that in turn provides the thrust. These engines are called Turbo-fan engines (Gas turbine rotating a fan 737, 747 etc) Propellers use either gas turbine engines (Turbo-shaft or Turbo-prop) or reciprocating engines to turn the propeller. However you can not achieve the same thrust from a propeller engine due to RPM limits of a propeller and length it would need to be would be impractical and create more drag and require more power to turn etc etc. Obviously this is a basic run down, there are more factors when manufacturers consider what propulsion they will use

9. When you see a large boat moving and dolphins or whales swimming underneath, how do the sea creatures know to avoid the propeller?

They probably have common sense not to swim into a part of the boat that is creating turbulence in the water. Whales and especially dolphins are extremely intelligent beings. but they can and do get hit by propellers and it's usually when a boat hits them. Unfortunately the only whales and dolphins people see these days are in virtual reality head sets. Makes the extinction of our oceans a non issue for them

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How Long Will a AA Battery Last When Powering a 1.5v Motor with a Propeller?
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How Long Will a AA Battery Last When Powering a 1.5v Motor with a Propeller?
You need to know how much current is drawn by the motor and the amp-hour (Ah) or milliamp-hour (mAh) rating of the battery. For example, a typical alkaline AA battery has a rating of 2700 mAh, so a motor drawing 1 amp should run for roughly 2.7 hours1. What are some drawbacks to having a wingtip propeller on an aircraft?Another non-flying attribute that having a wingtip-mounted propeller can drive is landing gear length. Since there are minimum clearance distances for propeller tip to ground during taxiing, and the wings may sag or dip during a turn while taxiing, you may end up having to change your gear length (which can cause other issues in turn)2. Is liquid hydrogen rocket propeller pollution free?Hydrogen is not quite pollution-free when it burns in air; some of the nitrogen will form NOx in the high-temperature environment. In a rocket with hydrogen and purified oxygen we get pure water in the combustion reaction but the hot exhaust can still form some NOx in air. Still, this is a lot less polluting (and more efficient for the rocket) than carbon-bearing fuels.3. Why 6 propeller and 4 jet engines on one plane?They are only designed to go forward. I know, sounds weird, but the wings on an airplane are really only made to provide lift so the thing can fly, in one direction. They can only go forward, or some version of it. Helicopters, on the other hand, have their "wings" or rotors, going around in circles overhead, all the time. They do not get to fly as fast, going forward, but they can hover and go in any direction where airplanes can not . Yeah, that includes backwards, helicopters can go backwards too. If you want bird versions of this, an albatross would be a good example of an airplane, great at going forward, but awkward to a non-flier in other directions (unless we are talking wide, gradual turns). A hummingbird would be more like a helicopter. ^__^ Hope this helps. Thanks for your time. Edit: My apologies for only thinking of going backwards in mid-air4. Which rc boat propeller is more effective for my purpose?i could look at cannibalising a fan form propeller from one in all those underwater pumps which you place into landscaping ponds and koi ponds. you know, those that pump the water up and out to make a waterfall action. i've got observed the little props in them and that they are approximately 2 a million/2 inches extensive with a pair of million/8 inch inner shaft with 4 or 5 blades. and the earnings of those props is they are designed to run approximately 5000 rpm at max performance, almost appropriate for a weedeater motor5. When can I find a propeller?Not in the AIRCRAFT forum. Try again6. What would be the most sad thing to see get chopped up by a boat propeller- a mermaid, a dolphin or a whale?i go for the mermaid they usually going around flashing their boobs...blah!7. How does a small propeller makes a big speed boat go?or ya could sink it and collect insurance money8. If you were to build a 4 engine (propeller), 6 pass., exp. aircraft, what engines would you use? Why?You could use pretty small engines for that, I've flown a six passenger aircraft with 300hp, single engine, or 400hp in a twin, so if you used something around 100hp each you should have more than enough power. It would be pretty silly however, when you can get a single-engine or twin that will really do the job you are asking.9. What's more reliable a jet or propeller engine?Oars !10. How does an airship propeller work?The propeller is spun by a motor or an engine, just like the propeller of an airplane. it acts like a wing does (in fact is is shaped similarly to a wing in cross section) Aircraft propellers work on the same principle as the aerodynamic lift created by air passing over a wing. The cross section of a wing will show that the upper surface creates a drop in air pressure allowing air to pass quicker on the upper side as compared to the lower side. Thus causing lift to occur.
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Is Time Travel Possible? Can We Travel Back in Time?
There is no actual "correct." Einstein made a "theory," not a fact. If Einstein's theory is correct, we could theoretically travel back in time but the problem is, we would not be able to go into the future1. What's the similarities between time travel and space travel?The faster your motion through space relative to a stationary reference frame, the more your motion is diverted from your motion through time. In other words, in a very specific sense, we move through time at lightspeed. The faster you move through space, the more your movement through time is diverted by your movement through space. At lightspeed, all your motion through time is diverted by your motion through space. A photon does not experience time. All of its motion through time is diverted by its motion through space. According to relativity theory anyway2. How to travel with cats?Some cats do fine being loose in the car. Try taking them for a little ride (5-10 minutes) and see how they react. I had one cat, a wonderful loving tabby, that I took for a car ride. I was not driving, so she crawled into my lap, squalled, and peed all over my lap! Some years later I had 3 Siamese, and drove from Wisconsin to Montana with them loose in the car, without a bit of a problem. I think its great that you are taking your cats along with you!!!3. Is it Cheap to Travel to Trinidad?It all depends on where you are flying from. If you are in the US it might be better for you to go to Miami. For me in the Caribbean, I would definitely go to Trinidad because the fair is cheaper, the prices are not that bad, I know my way around and I would feel safe. I can just go down town and buy a few doubles and just watch the people go buy sitting on the side of the road. You might not want to do that. I might even buy some shark and bake. Generally, I go to Chaguanas and shop but I might just stay in POS. From the time I take to spend that extra money to go to Miami I could stop right here in Trinidad. I have been there many times and I have not have a problem. It is up to you though because my experiences might be different to yours. All you have to do is to stay where there is lots of people and the same precautions you would take in your country take there. Do not walk around with your purse expose because that would be asking for trouble.4. Is it safe to travel to Israel?Of course it's safe. It's safer than the US. all that stuff you hear is media bullS5. Where to travel in Europe?You can visit Norway :)6. How do I learn about mountain bikes?Firstly, size. Also, go and have a look at a few of their bikes, there is an interesting rating system next to the bikes, indicating the type of riding that it is suitable for. Next, using 1 - 10 scale. But this is based upon components, layout and value for money. MBR is a good place to do some research. For general bike buying, it is advisable to stick to some of the bigger brands. Trek, Scott, Giant, Specialized. You might also consider some of the smaller manufacturers like Claude Butler or Dawes. For components use either SRAM or Shimano gears. Cranks, either Shimano or Truvative, although if you want to throw money at this you could easily look at 2 - 300 on Race Face or Hollowtec. However, many manufacturers use their own brand, eg. Bontager = Trek. However, if you stick with the brands listed above, they will use viable kit, it just depends how much money that you want to spend on your bike. Hard tail or full sus? Firstly, do not spend less than 700 on a full sus. Do not buy an all singing, all dancing 200 bike from Walmart, Tesco, Cycleking, etc. Hard tails tend to be lighter. Also, because you are not spending huge amounts on a rear shock, you get better quality components elsewhere. So, spending 700 on a hardtail will get you a nice race machine with good quality components and viable suspension. You will still get a nice full sus for this price, but the overall quality will not be as high. If you are just hitting well maintained gravel tracks and roads, you do not want your front fork to do too much, so 80mm travel is good. This is also good if you want to race, since you lose less forward power to bouncy forks. For general XC, about 100mm fork travel, although an adjustable fork between 80 and 130 mm is OK. Any fork that starts at 120mm travel will tend to fall into the all mountain category. These will have chunkyer tyres than XC and are better for bounlders and logs etc. Downhill will have a lot of travel up front, with a raked back design. Luck
Which Is a Better Design to Put on a Beer Pong Table?
Which Is a Better Design to Put on a Beer Pong Table?
Nah, Dude save yourself time and money. Just purchase some cheap spray paint. Paint DO NOT VOMIT HERE on your table and everywhere else you DO NOT want puke. Your good to go! Good Luck Beer Pong Guy!1. Help me with my BEER PONG TABLE :) 10 POINTS?beerpongtable.com2. What paint and coating do i use for a beer pong Table?Do what I do when I make/paint things, use trail & error. Try out your paints etc.on a waste piece of ply, much more fun to do it all yourself3. Where can i buy an inflatable beer pong table here in the philippines?Inflatable Beer Pong Table4. how do i make a beer pong table?Advice on building Beer Pong Tables Large areas of paint: The best way to do the larger parts of the design is just spray paint with masking tape pressed down to prevent bleeding. Sanding the table down on places where you expect paint edges to be present also cuts down on bleeding. Ours bled a little on most edges, but we just put down white electrical tape on the points where the paint met the wood and it looked fine. If you have the resources, buy/rent a professional-grade low pressure paint spray gun (check out Home Depot or other home improvement stores) and you should not have any bleeding. Lettering For the more intricate parts, we got some heavy, glossy paper meant for LaserJet printers, and cut them out by hand. It was a pain, but it was the best way to do it. You can probably get away with thinner paper. Basically, thinner paper is more likely to let the polyurethane soak through, but it's also less likely to stick out of the poly (you can run your finger over the letters in our first table and feel a tiny ridge). If I were you I would get heavy paper, and then just poly the hell out of it (5 coats, wait 24 hours between each coat). Oh, and get a clearcoat/polyurethane that goes on clear. The white parts on your table (if any) will get a brownish tint otherwise. Graphics For the graphics on our basketball court table (ACC text and the flag) we went to the actual court and just took some digital pictures. With a little help in Photoshop, we were then able to get the graphics the right size and shape (for example, taking a picture of the "ACC" meant that it was kind of like a trapezoid, with the top part of the text not as wide as the bottom, since I took a picture from an angle as opposed to a bird's eye view). Anywho, for those we just went to Kinko's and printed it out on their good computer and color printer. Then we glued it on and polyeurethaned over it. Keep in mind you can always look for graphics online and just print them out (Google has an Image search feature that works well). Sturdy construction We do not have any plans drawn out (well, not on my computer anyway), but it's pretty easy to make a sturdy table. If you've got over $150 allocated for this, do not spare any expense on quality. 3/4" pine plywood is the sturdiest non-expensive board you can get. It will come in an 8'x4' section, but feel free to cut it down (but 8x4 is a nice size). If you've got money to waste, you can even get 3/4" oak. It will look better and is sturdier. You are going to want to build a sturdy frame underneath the table. A complete border of 2x4s should lay underneath the plywood. This not only looks good, but provides most of the anti-warping support. You are also going to want to spend the extra couple of bucks for two more 8' lengths of 2x4s to lay lengthwise along the underneath of the table (so you will have something like four 8-foot 2x4s underneath the table lengthwise, and then two 4-foot lengths at the edge). Legs are pretty easy. We use 4x4's, which is sturdy as hell but does not look great. If you paint them, they might look fine. In any event, a 3/4" plywood with the said frame underneath will never warp, and can even handle a few drunk college boys standing on top of it (not that I would suggest that). Misc Also, get trim for the edge of the table. It's $1/ft. and well worth it. It makes the table look much better, and even stops the occasional ball from rolling off. And to make sure that the table can handle all the beer that will get spilled, use a ton of polyurethane/clearcoat. If you have the time, do over 5 coats (10 is probably the most you will need). Follow the directions on can, but you should most likely not do more than one coat a day (bubbles could form if it does not dry all the way).
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