Questions tagged [propellers]

A mechanical device for propelling a drone or aircraft, consisting of a shaft with two or more angled blades attached to it.

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Can a push-prop model plane use control surfaces forward of the propeller, but which do not extend beyond the perimeter of the propeller's swept area?

While reading about various drone airframe configurations, in particular the trade-offs between various wing designs, I thought of a propulsion and control pairing which I have yet to find in the ...
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2 votes
1 answer
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Finding new props that will fit

I have an old wifi drone with 2-blade props that I would like to upgrade to 3-blade props, but I'm having a hard time finding any that will fit my drone and I'm not familiar with the different methods ...
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  • 123
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1 answer
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How to calculate lift for multiple rotors?

So I know that $L = \frac{1}{2}​ρv^2AC_L$, but if I want to find the lift for a three-blade helicopter, do I just multiply by 3 or what? Let's say I have a 700mm rotor at 61mm wide, would it be: $L = ...
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2 votes
1 answer
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Which propeller for these motors for rc airplane

I am new to this hobby and I am looking to make a rc airplane myself but I am confused to buy which propeller for this motor? Shall i buy CW or CCW propeller Thanks, Paarth
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4 votes
2 answers
44 views

DJI spreading wings 900 propeller size

I need to know the size (length and chord) of the UAV spreading wings s900 propeller. It should be 1552/1552R and the only info I was able to find was this size: 15×5.2inch (see here). I found that ...
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  • 143
5 votes
1 answer
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Contra-rotating coaxial shrouded fans: design guidelines

I want to design and make my own Dronut-like drone. The size will be limited by my LCD printer. My goals are: quiet. 2) safe. 3) duration. I'd like to use a pair of HBR turbofan style fans to ...
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  • 51
3 votes
1 answer
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How to couple panel method velocities with boundary layer equations to obtain viscous pressure and lift coefficient?

I have calculated CP(pressure coefficient) and CL(Lift coefficient) for a NACA2412 airfoil using the panel method but as it only allows us to calculate the same for inviscid flow, I could not get the ...
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-3 votes
1 answer
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what kind of propellers should I use for my rc b29?

I want to make a remote controlled b 29 super fortress out of balsa wood. The estimate weight of the aircraft is about 10 pounds. What are the best propellers to use since I would like to fly at at ...
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2 votes
1 answer
45 views

Do I need anything else for this drone build?

So far, I have these parts as all I need for a drone build. Is there anything else that I need or should have? Flight controller: DJI Naza-M Lite TX/RX: FS-i6 Drone body: F450 Motors: 2212 920kv ...
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  • 303
5 votes
1 answer
72 views

Influence of propeller blade shape and tip shape on its behaviour?

Newbie here, still learning how to fly and having to buy new propellers. Of the various properties to be chosen among, there are two that have me a bit baffled: symmetrical vs. undercambered and ...
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  • 153
3 votes
1 answer
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Will a heavier drone frame help in avoiding toppling. (Not using receiver yet)

I have these coreless motors and propellers. I created two kinds of home made drone frames. I am not currently using any receiver. I arranged the motors so that diagonally opposite ones turn in same ...
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  • 381
2 votes
1 answer
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Loose drone propeller mount, flying off at high throttle

I have seen this post here that asked the same question, however, the user forgot to use one component (collar). I have similar components and even when I mount everything correctly, the mount is ...
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5 votes
1 answer
48 views

Compact Gimbaling propeller

does anyone know how would you create a compact gimbaling propeller, like how a rocket engine gimbals. Similar to that! Thank you for the help!!!
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5 votes
2 answers
68 views

How can I increase the lifting power?

I understand the concept of lower KV bigger prop to increase the lifting capacity. But sometime that is not possible if your drone frame is just so big. For example I have a S550 I like to increase ...
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6 votes
1 answer
75 views

Help with finding a motor to rotate the plane of a propeller

I don't really know if this is related to this community but it's for a drone so it's worth a shot. I'm looking for some sort of motorized hinge or a motor that can move a propeller on the Y-Axis, a ...
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2 votes
1 answer
98 views

recommendations for a DIY/dev platform lifter drone

I was mainly wondering if there was something in the drones world, similar to what the ender3 is to the 3d printing community -- that is, a cheap kit massively owned by makers and open source ...
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4 votes
1 answer
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How do I attach a propeller to this motor?

As many of you already know, I am getting into RC planes. I went to my hobby shop today and bought a motor and some props, but I can't figure out how to attach a propeller to the motor. Unlike what I'...
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8 votes
2 answers
116 views

How to keep my prop from flying off my motor?

After finally getting every piece on my plane to work, another piece decided to be a problem. Great. My problem is pretty much already summed up in the title, my prop keeps flying off my motor, and I ...
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5 votes
1 answer
267 views

Eliminate effect of Vibrations on IMU

I am testing pitch orientation correction of Quadcopter and ended up in a issue. I have a test setup with one degree of freedom to test orientation correction. I have fixed the drone to the setup and ...
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1 answer
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Which battery do I need for my drone?

I am totally new to the drone space and I recently acquired a hand-me-down drone without a battery. It has a XT60 male connector type with 4 motors (DL2205 KV=2300).
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  • 21
6 votes
2 answers
3k views

Do I need CW or CCW props for my plane?

So I'm making an airplane with a motor at the front, do I use CW or CCW props? Pretty sure this is what counts as a puller plane (is that the right term?).
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5 votes
1 answer
60 views

Picking the right prop pitch for my plane

Sorry for all the questions, but I'm trying to figure out what I need before ordering a hundred dollars worth of stuff and then find out I got the wrong stuff. So from what I understand of this site, ...
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3 votes
3 answers
1k views

Why are micro pusher-prop quadcopters becoming more popular?

Recently, I've seen a rise in popularity of small drones using pusher props. Some of these include the FullSpeed TinyPusher, BetaFPV Beta95X/Beta85X V2, Diatone Taycan and Tinawhoop, and originally ...
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  • 5,510
4 votes
1 answer
86 views

How to decide drone motors?

I'm planning to design a quadcopter with a payload capacity of 5 kg. I would need the thrust power from the motors to cater for at-least 7 kg with extra part weights. I would like to know, How do I ...
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5 votes
1 answer
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What factors affect the noise level of propellers?

I've noticed that the noise level of different quadcopters can vary quite a bit, especially in the sub 3" range. For example, some of the Tinyhawk models are extremely quiet, while other similarly ...
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3 votes
1 answer
63 views

27+ inch racing propeller suggestions?

I'm looking for some propellers that can handle high rpm (7000-9000) and are large in size. (27+inches length) (pitch: 15+) Any suggestions?
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2 votes
1 answer
58 views

Recommendations for a BLDC motor and battery for a 28x20 propeller?

I'm looking for a motor and battery set up that can last for over an hour and spin the propeller at 6000+ rpm. The propeller is a 28x20 single blade being connected to a second blade for a total of 56 ...
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3 votes
2 answers
37 views

Do propellers at different angles work the same? And do intersecting flows of air work the same?

Say a propeller pushing thrust downwards generates 70 lbs of force. If you tilted the angle of the system to 45 degrees would it generate the same thrust? If you had each rotor angled inwards of a ...
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3 votes
2 answers
212 views

Do flexible propellers affect multirotor efficiency?

There are a wide variety of materials and methods for making the propellers used on drones. This leads to certain propellers having different characteristics than others. Some propellers are more ...
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  • 5,510
10 votes
2 answers
3k views

Do propellers layered on top of each other have twice the thrust of one propeller?

If you had two of the same propellers layered on top of each other going at the same RPM, with some space in between, would the thrust be double the amount of a single propeller at the same RPM? If ...
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3 votes
2 answers
260 views

How to reduce propeller tip losses?

I have heard that tip losses in propellers can occur when a propeller is highly loaded (when there is a much higher pressure under the prop blade than above it). This can happen with drones that fly ...
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  • 5,510
4 votes
1 answer
193 views

Does the sharpness of a propeller blade affect efficiency?

Some of the propellers I have used on drones have sharp edges (sharp enough that they have cut me) and others have comparatively dull edges. Does the sharpness of the leading edge of a propeller ...
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  • 5,510
5 votes
2 answers
2k views

How to measure the pitch of a propeller?

I have some random drone propellers which I don't have any information on. I looking to find a way to measure the pitch of the propellers to figure out if they will be well suited to a 5-inch drone I ...
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  • 5,510
13 votes
5 answers
6k views

Why do most drones have upward facing motors?

Most freestyle quadcopters I have seen are specifically designed to fly with the motors facing upward and have the arms of the drone underneath the propellers like this: As you can see in the picture ...
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  • 5,510
2 votes
1 answer
95 views

Datasheets for lift of a 27x12x2 inch propeller?

I'm looking to find the amount of lift produced by a 27 inch diameter, 12 inch pitch, two-blade propeller spinning facing the ground. Are there any datasheets that show the amount of lift given at any ...
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13 votes
2 answers
1k views

How do laterally folding propellers affect multirotor flight?

There are a number of multirotors on the market which have propellers which fold at the hub, primarily to make storage and transport easier. Centrifugal force keeps the blade extended when the motor ...
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  • 5,866
13 votes
2 answers
2k views

Why do drone propellers have blades with thin chords?

Almost all propellers used for drones have very thin chord length compared to the propellers used for things like table fans or boats which seem to have blades with much longer chord length. What is ...
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  • 5,510
14 votes
4 answers
5k views

Why are larger propellers generally more efficient than smaller ones?

In almost every case, long-range drones use larger propellers than other drones that don't need to travel very far or don't need to fly for very long. I have heard that a major reason for this is ...
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  • 5,510
5 votes
1 answer
100 views

Does active braking help protect propellers from damage?

As far as I know with active braking option enabled in BLHeli32 the speed controller will counteract the free spinning of the rotor according to throttle value hence making it slow down quicker when ...
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3 votes
1 answer
189 views

Differences between fiberglass-reinforced plastic and polycarbonate propeller materials?

What are the differences between drone props that are built from fiberglass-reinforced plastics and props made from polycarbonate?
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  • 5,510
3 votes
1 answer
169 views

How does a propeller with more blades create more "grip"

I have heard that the more blades a prop has, the more "grip" it has in the air at the expense of speed. How do more blades create more grip but lose top speed?
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  • 5,510
3 votes
1 answer
97 views

What propellers should I get for my drone?

How do I know what type of propellers to get for my drone and what do the specific numbers for each propeller mean?
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  • 5,510
8 votes
2 answers
87 views

How much air-intake space do I need in front of my DJI Spark's propellers?

I've got a DJI Spark that I sometimes use for close-proximity flying such as inspecting the roof of a house. The stock propeller guards protect against flying laterally into an obstacle, and the ...
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  • 676
2 votes
2 answers
443 views

What props for a 2207 2750KV motor?

I have a 4s Nazgul5 drone. It is a 5'' drone and uses 2207 2750kv brushless motors. What is the most aggressive prop I can use on the drone without causing it to overheat or cause the battery to sag?
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  • 5,510
15 votes
6 answers
408 views

How does one hold the motor bell still when tightening prop nuts?

Almost all of the brushless motors used in hobby-grade multirotors have a single threaded shaft and rely only on friction between the propeller and motor to keep the prop from slipping. This means ...
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  • 2,897
17 votes
4 answers
2k views

How does a quadcopter yaw?

I've always wondered how a quadcopter actually yaws, when all propellers are horizontal. I know that two of the motors spins faster, but I don't understand how that generates thrust in the horizontal ...
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