Propeller Definition and 139 Threads

i will make an report about the propeller efficiency can anyone help me and tell me the things i need to put in this report and the references i can use

Now i am doing study on vessels propeller efficiency which i can determine the best time to do propeller polishing.Do anyone have any idea on how do i calculate this propeller efficiency

could anyone help me in that please? i want to to detmine the effect of the propeller slipstream on the horizontal tail the aircraft is pusher and the propeller in front of the horizontal tail the distance is 15cm and the propeller diamter is 40cm or anyone help me with references

why propeller airplanes have superior take-off performance than jet airplanes?

Hi Everyone, There is something I am having trouble I am understanding. Why does a spinning propeller cause a plan to yaw while it is taxiing? Also, how does the flow behind a propeller effect the performance of the control surfaces on the tail? Does it have any effect? Because the flow...

I need to study about the variable pitch propeller and its mechanism of adjusting the angel of the blades. And also about the materials used to make propellers and their benefits.. can someone please help me to find sources such as images/videos about the variable pitch propeller? or...

How calculate propeller efficiency if I know propeller trust ant motor power and motor efficienty?

Is there some equation i can use in order to approx. find the trust created by a prop at a known RPM?? -Tom

Is there a noticable diffence in torque required to spin a marine propeller at a constant rpm (say 2000rpm) when under a different water column? (5m vs 35m)

Is it possible or will it be possible to keep some magnetic liquids in some desired geometry and use as a traditional screw propeller ? Is it patented or visioned before ? Best regards , Mustafa Umut Sarac Istanbul

Homework Statement An airplane propeller is 2.02 m in length (from tip to tip) with mass 127 kg and is rotating at 2300 rpm about an axis through its center. You can model the propeller as a slender rod. a)What is its rotational kinetic energy? b)Suppose that, due to weight constraints, you had...

Thanks in advance - it went smoothly so I'm hoping I'm right but... usually that's when I've made a big mistake. Homework Statement An airplane propeller is 2.08 m (tip to tip) and has a mass of 117 kg. When the engine is first started it applies a constant torque of 1950 N m to the...

Hi, I need to make a propeller using either soda bottle plastic or cardstock. I think I can come up with a mechanism to spin it with a rubber band, but, I need an efficient propeller that creates enough power to move the car I am building. Any ideas/possible designs?

I was thinking about the difference between the appearance of a propeller on a plane and a rotor on a helicopter. What is the consensus?

[SOLVED] Airplane propeller and plane's velocity relative to the ground. Homework Statement An airplane propeller rotates at 2200 rev/min while the airplane flies at a speed of 550 km/h relative to the ground. The plane's velocity is parallel to the propeller's axis of rotation. Part a)...

Good day I hope someone can help. I am looking for marine propeller theory. Things like how do the diameter of a prop determine the speed of a vessel ? What effect does the blade angle or shape for that matter have on the functionality of the prop. If someone can help with the theory behind...

[SOLVED] angular acceleration of a Propeller Homework Statement An airplane propeller is rotating at 2000rev/min . \omega[SIZE="1"]z = 209rad/s How long in seconds does it take for the propeller to turn through 40degrees? Homework Equations \theta = 1/2\omegat \omegaz =...

Homework Statement A stroboscope is a light that flashes on and off at a constant rate. It can be used to illuminate a rotating object, and if the flashing rate is adjusted properly, the object can be made to appear stationary. (a) What is the shortest time between flashes of light that...

Homework Statement An airplane propeller is 1.85 m in length (from tip to tip) with mass 97.0 kg and is rotating at 2300 rpm (rev/min) about an axis through its center. YOu can model the propeller as a slender rod. What is its rotational kinetic energy? Suppose that due to weight...

for my design project, i have to consider a feasible prop systm for a single engine propellr driven aircraft and I am thinking about diesel engines. they seem very efficient and cheap for aircraft propulsion. ill have a small number for power/ weight ratio but it will be cheaper and it wll use...

hey guys, urgently need your help, I am an industrial design student and at present we have a project that involves designing and constructing a peddel powered water craft. there will be a race upon completion of the craft therefore it needs to be reasonably fast. If you have any...

Hey, I have this theory about static and dynamic pressure generated by a propeller, but I might be wrong, so I could use some comments on this. Its kinda long and whiney, but well.. here goes; Lets say I have a motor with propeller, spinning at a certain rpm. -In the first scenario, I put the...

Hey, Yet another propeller question on this board. I have done my research, both here & on google, but I cannot seem to find an answer. Lets say I have a motor on which I mount a propeller. This motor is static (not moving like on a flying airplane), so say its a small ventilator...

Air or Water: I'm looking for information on fan and propeller shapes (ducted and non-ducted) which might lead to more quiet if not more efficient shapes. Noise is lost energy just as heat is lost energy in a mechanical system, right? I have a thread which contains many bits of...

"Pitch is defined as the theoretical forward movement of a propeller during one revolution — assuming there is no "slippage" between the propeller blade and the water" i dont, kinda, really get this definition of the pitch. i searched it at so many sites. they all say the same thing, like pitch...

I need to contact who ever would be authority on propeller design and applications. In short, the Idea is to build a Aluminum prop, 1.2 meters diameter with weight of about 1000 grams. Targeted application would be primarily for powered para gliders. I need some arguments for and against...

Question: what is the range for propeller efficiency for plastic toy propellers?

I have a physics project where I am supposed to make a car from index cards, manilla folders, paper clips, drinking straws, glue, tape, rubber bands, etc. I am attaching a propeller to the back, but I need a decent design i can make by cutting and bending a manilla folder. It should not be more...

I have a physics project where I am supposed to make a car from index cards, manilla folders, paper clips, drinking straws, glue, tape, rubber bands, etc. I am attaching a propeller to the back, but I need a decent design i can make by cutting and bending a manilla folder. It should not be more...

I have a physics project where I am supposed to make a car from index cards, manilla folders, paper clips, drinking straws, glue, tape, rubber bands, etc. I am attaching a propeller to the back, but I need a decent design i can make by cutting and bending a manilla folder. It should not be...

:confused: I am working on a project where I need to understand flight physics. I am having some trouble getting the whole torque vs power vs thrust thang. I'm basing my project off a existing ultralight, the LightSport Ultra from Free Bird Innovations. Here are the specs: 530lbs...

can anyone show me how to solve this problem? a cart on wheels with a mass of 250 g has a motor driven propeller with a force P of .3 N, and it moved down an incline of 30 degrees with an acceleration of 3.5 m/s^2. What is the force of friction ? determine coefficent of friction

can anyone show me how to solve this problem? a cart on wheels with a mass of 250 g has a motor driven propeller with a force P of .3 N, and it moved down an incline of 30 degrees with an acceleration of 3.5 m/s^2. What is the force of friction ? determine coefficent of friction

An airplane propeller is 2.08 m in length (from tip to tip) and has a mass of 117 kg. When the airplane's engine is first started, it applies a constant torque of 1590Nm to the propeller, which starts from rest. Question I: What is the average power output of the engine during the first...

Is there any formula to find the lift genetated by a helicopter propeller?

If the propeller is placed in front of wings and since the job of the propeller is to accelerate the airflow, wouldn't it result in faster airflow around the wing resulting in increased lift?

First of all this is for marine duty. Iam using a Gear which supplies the shaft flange good for shafts up to 4" in diameter but iam restricted to use a 4.5" shaft. In this case i have to design the flange .. iam struck here could anyone of you please guide me .. how to find out the flange...

here is the problem: An airplane propeller is 2.08 m in length (from tip to tip) and has a mass of 117 kg. When the airplane's engine is first started, it applies a constant torque of 1950 N*m to the propeller, which starts from rest. -What is the angular acceleration of the propeller...

Water Propeller -- General physics questions Howdy, I have been following the boat bike concept for a few days and am interested in finding out more on how to get better water surface speed. The props on these bikes look small and the specs are touting no more than 10 km/h. Can anyone...