windmill- breanna gordon

Calculations
39.37x9.82x11.03=398.21/16.6 = 23.99

* energy+398.21 joules

*power=23.99 watts

1. Airplanes and windmills both use air pressure to fly, without the pressure they would not be able to fly at all. The pressure helps hold the airplanes be held up in the air and fly. The air pressure makes the turbine spin to make energy.

2. If you do not twist the rotor blades at an angle they will not spin as well as they could compared to if they were straight.

3. The rotors on a windmill are a lot like the sail on a sail boat because they both are used to catch wind.

4. One of our rotors did not work at all because it was not sturdy enough, our other rotor was more sturdy and it worked.

5. The windmill that had the most output used rulers and was more straight and sturdy than others.

6. There wasnt really to many limitations it depended on how creative you were and how hard you pushed yourself.

Wind Turbine--Shelby!

**WIND TURBINE BLOG!  Shelby!(:

How does an airplane and a wind turbine use air pressure to rotate? It's called the Bernoulli's Principle.This is when the increase in the speed of a fluid produces a decrease in pressure and a decrease in the speed produces an increase in pressure.

Why was it necessary to twist the rotor blade at an angle?

Because of the angle, it's easier to catch the wind and spin. If it was just a straight on, it would barely spin at all, and then we wouldn't create any energy!

Explain how rotors on a windmill and sails on a sailboat illustrate the same principle.
We basically made a model of a windmill with our pin wheels. The rotors on those are very similar, although its all about the structure. The better the structure, the more the rotors will spin and energy is going to be produced. This also applies to the airplanes and windmills.

Which rotor had the most power and why?
Kristin and Maddie's. Theirs was cleverly made. They went outside the box and built theirs out of plastic rulers welded together. Their blades were long and thin, yet still light in weight because it was made from plastic. Everybody else was pretty much sticking to the "pinwheel" design as well. Our planes were short and fat. Where as Kristin and Maddie made one that was similar to our modern day wind turbines. It was quite successful, and therefore, produced the most energy.  

What was different about the windmill w/ the maximum output?
(Stated above)

What are some of the limitations of the model?
There aren't very many not-so-good things about the model since it was cheap and still created a lot of power. I'd say the material couldn't withstand being an actual full-sized wind turbine (obviously) because it would crack and break off easily. But as a Science project, they get an A in my opinion! (: More people should have followed their 'long-and-skinny-slightly-tilted-not-a-pinwheel' design.

--SHELBY

windmill blog--Meg Trumper

our calculations:

energy=398.21 joules

power= 398.21/16.6 sec.

total power= 23.99 watts

39.37*9.82*11.03=398.21/16.6=23.99

How do airplane and windmills use air pressure to fly and rotate?

Well, air planes and windmills fly and rotate from the air pressure, by taking the wind (or air pressure) that is blowing onto it, or it is going through. The wind is like caught in the the curves of the rotors, or blades, making them move. I think it depends on how much air pressure their is, though!

Why was it necessary to twist your rotor blades at an angle?

It was necessary to twist the rotor blades, because it has to be there to basically catch the wind, and scoop it up, so they can move. With out any twisted-ness it cant spin, and it wont be moving!

Explain how rotors of a windmill, and a sail of a sailboat illustrate the same princible.

Well, the both make the things move! They both convert energy from one type to another.They both turn kinetic energy into electricity.

Which rotor had most power and why?

Kirsten's rotor did the best. Because, hers was long and thin, with a slight curve. It was almost perfectly set up! Actually, it was!

Who had the highest max. output ? why, what made it go, what was different about her design?

Kirstens...becuase as I said before, it was long, skinny, and slightly twisted. So, it was unlike everyone elses...because all of ours were all short and fat!

What are some limitations of the model?

The had to be slightly curved to grad the air pressure, and they had to be long, so they could turn more easily.

Madeline's Windturbine Blog

1. How do windmills and airplanes use air pressure to rotate and fly?

Windmills and airplanes use air pressure to rotate and fly by using what is called Bernoulli's principle. This is when the difference of air pressure forces lift on airplanes and the turbines to turn.

2. Why was it nessecary to twist the rotor blades at an angle?

It was nessicary to twist the rotor blades at an angle so the blades could catch the wind and spin more easily, providing more energy.

3. Explain how the rotors of a windmill and the sail of a sail boat illustrate the same principle.

The rotors of a windmill and the sail of a sail boat both illustrate Bernoulli's Principle.They both illustrate this because the curve of the blade or sail increases the speed of the wind at the point of the curve. This causes the air pressure to change on one side. With different air pressures on each side of the blade or sail, they will move.

4. Which rotor had the most power? Why?

Kirsten and Madison's. Their windmill had the most power because thier blades were long and skinny-- the ideal design for windmills. Also, the blades were at an angle-- which helped catch the wind. Finally, their turbine was light enough to turn easily, not not so flimsy that it broke.

5. The maximum power in the classroom varied. What was different about the design that produced the most power?

Kirsten and Madison's design was different because as I just mentioned, their blades were long and skinny. Lots of other designs, including mine, were more short and thick. The blades were at an angle and the weight of the windmill was just right!

6. What are limitations of the models?

The limitations of my model were that it was rather flimsy. If the wind had gotten super powerful, there is a good chance that my model would break. Also, my models was very short and thick. If I were to do this again, I would build a windturbine more sturdy as well as longer and thicker.


Length of string:  85 cm
Total washers lifted: 7
Mass of washers: 50.02 g
Seconds needed to lift string: 41
Amount of energy produced: 12.4 W

Madison Koonce's windmill questions

1) It was necesary for the blade to be at an angle, because if they were straight on, the wind would just blow and the blades wouldn't catch the wind and use that energy to push the next blade around.
2)Roatrs on a windmill and the sail on a sailboat both work with the bernelli's principal. When you have air pushing towards your object from a farther distance you will have more energy to move the sailboat or the turbine.
3)Our ruler windmill had the most power.
4)Limitations on this model could have been that the rulers had holes in them, allowing the air to go past the blades. We later taped the holes so we could keep adding weights.
5)The difference between the maximum out put and others were that we didnt follow the pinwheel model, our blades were at an angle, and we took the bennelli principal into consideration when posistioning our fan.
6)Airplanes and windmills both use air pressure, when the wind (kinetic energy) turns the blades which turns into mechanical.

Number of Washers	Mass	Time in seconds	Height (meters)
17	122.26	15	.86
18	128.45	15	.86
19	155.66	21	.86
20	143.0	30	.86
21	150.4	18	.86
22	157.8	17	.86
10	69.07	29	.86
16	114.89	14	.86

Windmill blog: Tristin Snyder

1.The blades on an airplane take the air that is standing still and pushes it backwards. The wind pushes the rotors on the angled parts. It pushes one way making it go around.
2. If the blades weren't twisted the wind would just push on them and they wouldn't spin.
3. They both catch the air and use it to push them.
4.Madison and Kirsten's rotor
5. it was longer with skinnier blades. it had more of an angle than ours
6. Some limitations of our windmills are flimsy blades. They would start to bend if there was wind and it wasn't turning

Windturbine-Bergndi!:)

-How do an airplane or wind turbine use air pressure to rotate.
--The wings on an airplpane use air pressure to help the fly the plane, sort of like a bird uses its wings to fly! A wind turbine uses airpressure by the wind turning the blades on the turbine.

-Why was it necessary to twist the rotor blade at an angle.
--It was necessary because if the rotor blade was straight, the wind would hit it straight on. This would make it more difficult to turn the blades.

-Explain how the rotors on the wind turbine & the sail on the sailboats illustrate the same principal.
--On a sailboat, the wind hits the sail at an angle. This is why its possible for a sail to steer a boat. Turbines use this method too.

-Which rotor had the most power and why?
--Our first rotor (the big pink one) worked best. I think this is because the blades were longer, and a bit bigger than our other rotor.

-The maximum output of other wind turbines varied in our class. What was different about the turbine that had the maximum output?
--The difference between Maddy and Kirsten's wind turbine and ours was that there's was smaller, and thinner. Thats why it worked better i think. It was easier for the wind to spin the blades!