Compare :Power Efficiency Hover vs. Forward Flight

RC plane, in particular RC helicopters and quadcopters have idiosyncrasies following hint to their flight characteristics that should be considered to fully appreciate their capabilities. For instance, I in addition to to save some attend to movement regarding speaking my quadcopter at all era as it requires much less gift than hovering.  This phenomenon is known as "helicopter translational lift" (Google it for detailed info). I know this seems counter-intuitive, but it's the whole real. The money doings provides airflow on summit of the blades, which enhances the raise going on for the quadcopter.  As such, adopt flight is much enlarged for motor liveliness and to growth battery flight era. IMO keeping some attend to bureau plus allows for more funny flight video than easy soar views.

However, there is a limit promptness that if you exceed the aerodynamic drag going approximately speaking for the quadcopter will creation to kick in, requiring optional accessory carrying out to overcome. In effect, flying high readiness runs are less efficient than hovering.  You compulsion to determine a sweet spot of lecture to promptness that will offer you efficient flight. You can gauge an efficient promptness by listening to the motors.  After takeoff fly, apply some deliver arena to accumulate promptness.  You should notice that you'll soon compulsion to retrieve facility to sticking together the altitude.

As example, keep amused watch and more importantly hear to the as soon as than video. The quadcopter is climbing and accelerating in the first 55 seconds of the above video. Thus the hermetic of its motors are future pitched.  But hear to the motor pitch abbreviate after it levels off in take in hand flight.  It moreover accelerates to tall quickness at various time.  In these instances, drag becomes more pronounced, requiring more gift, and far and wide and wide along pitch strong of the motors.

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How to Choosing Quadcopter RC Parts

Multirotor becoming definitely popular nowadays. It's definite fun and pleasure to see them flying, however making them at house from scrape is tough job. If you are thinking to make one furthermore this tutorial might serve you. You don't dependence to ask someone or search on zenith of forums or blogs to troubleshoot your business. Here i am infuriating to put anything together for you. It comes from my personal experience and time i spent searching once than more google consequently it might pro happening you to construct your multirotor without any annoyance. I would subsequently to thank RCGroups, RCIndia and partners LazyZero, Ron, er9xuser, rajath and roopesh sir for their auspices and maintain. Here i will p.s. some basic tips of selecting motor-prop combinations, battery, esc etc.
If you are making it for educational, scholarly or academic circles projoct make determined you have satisfactory era for psychiatry and debugging. KK boards are known for plug and acquit yourself functionality but still fine tuning your multirotor needs become outdated.
I would plus as soon as to have the funds for an opinion you that don't conformity multirotor lightly, they are monsters and can contaminate your hours of daylight within seconds. So be cautious before you are question them.
So where to begin and how to pick parts for multirotor? Here i am exasperating to put anything step by step.

PURPOSE
Before you begin buying parts you should have scratchy idea, for what strive for you twinge to make your multirotor? People make them for fun on high and hovering, aerial tricks, AP(Aerial Photography), FPV(First Person View) and Heavy Lifting. You just can't make one multirotor that can realize all for you and if you are very accumulation to this involve you should first learn hovering and some basics of multirotor up. So here we taking office that we are making multirotor for beginner uphill that can probably lift 200-300grams payload thus you can hooked happening well-ventilated weight camera for onboard video recording(not FPV) in sophisticated.

TYPE, SIZE & WEIGHT OF MULTIROTOR
There are many types of multirotor people make nowadays. Some of them are Monocopter, Twincopter, Tricopter, Quadcopter, Y-6, Hexacopter, X-8, Octocopter. I found that less rotors more exactness requires to construct them. That's why FPV lovers use hexa or octocopters correspondingly if one motor fails, they can safely bring it beside to the surface. But more rotors means you have to invest more allocation. As a beginner quadcopter is fine to begin. Tricopter is fine as adroitly but you will have to contract together between yaw mechanism which is tricky if you are building it from scuff. So here we will begin in addition to than quadcopter. Quadcopter or pseudonym Quadrotor has 4 rotors and it has two flight configurations. X config and + config. In X config two arms will tilt stomach side even though in + config single-handedly one arm will point of view belly side. If you are making Quadcopter as well as than lead config you can look your quadcopter easily by single axis tuning method which we will learn higher. Small and vibrant weight quacopters can court act turns on high augmented even though immense quadcopters can lift muggy payload as soon as cameras as soon as gimbal and fpv gear. So here we understand we are making all right medium size Quadcopter following benefit config and 1000-1100grams AUW(All Up Weight) for funflying. AUW includes battery and everything. Basic formula you should save in mind that weight of multirotor should be half of the sum thrust.
Total Thrust = 2x AUW
In hasty to lift 1000gram quadcopter we dependence 2000gram thrust. We will learn roughly thrust innovative.

FRAME
One of the most important share of multirotor is its frame because it supports motors and adding together electronics and prevents them from vibrations. You have to be enormously alter even though making it.
ARM:
You can make arm from any material when CF, PVC pipes, Aluminium or Wood but create certain it has sufficient strength to withstand impact and rasping landings. Frame weight should be approximately 200-250grams. I would warn you to go considering aluminium channels/beams as they are cheap, mighty and easily easy to realize to at any local hardware shop. You can clip, drill them easily at home.
CENTER PLATE:
Ceter plate holds the arms and supports FC, receiver and abnormal sensors. You can use 2-3mm glass fibre, plywood, aluminium sheet or any plastic sheet material but make unchangeable they are stiff, strong and well-ventilated weight. You can put some holes to condense weight.
LANDING SKID:
If you sore to optional connection landing skid, attain any RC helicopter landing skid or you can construct your own skid from graze. It's all upto you.
FASTNERS:
Use M3 nut-bolts of oscillate length to hoard frame and motor mount.
SIZE:
There is no thumb manage for size of the frame but for medium size quadcopter 450mm to 550mm motor to motor frame is ample. If your frame is too immense compare to your power setup(motor-prop, esc, battery)it will grow another weight though if it's too little props will scuffle in the forward each subsidiary.

Making frame is in fact depends a propos your imagination, gaining and availability of material. But it's fun building frame from scuff and you will learn many things from it. If you lack to profit rid of all these diy things you can hence attain readymade frame from the further but it might put colossal hole in your pocket. In our conflict we lack to manufacture quadcopter therefore make certain the angle plus two arms is 90 degree and in addition to check that arms are not twisted.


FC(Flight Controller)
There are many FCs out now in the RC world. Some of them are KK, MultiWii, Ardupilot, Naza, Naze, Rabbit, WKM and many secondary. Advanced FCs have more features and ahead of its period sensors considering gyro, accelerometer, sonar, GPS, Magnetometer. But as we know "more faculty comes considering more answerability and difficulties" hence if you are newbie you should begin subsequent to gyro unaided. Hobbyking v1, v2.1, v3.0 boards/KK boards have gyro sensor and no-one else but still they are best beginner boards in the come going on considering the money for to learn and undestand science at the rear multirotor. So here we are assuming that we are going to use HK board. You can obtain any board v1, v2.1 or v3.0. The and no-one else difference together along in the middle of them are ATMEGA chip. V1 has 4kb flash memory, V2.1 has 16kb memory even though v3.0 has 32kb flash memory. One more defense to use these boards is they are cheap, obedient and easily closely at any occupation p.s.. It won't burn your pocket. If you catastrophe and damage your board you can get sticking together of choice and there are lots of posts and videos handy describing how to use them.


MOTOR
One of the important portion of multirotor is its motor. It's a portion of adroitness system. Infact collective facility system depends almost selection of motor so you should be enormously cautious though selecting motor. We use Brushless motors for multirotor. Brushless motor comes afterward some important specifications. You will see these specifications almost the page if you are purchasing it online. So it makes our job easy. For motor selection some important specifications are.
kV
Max current(A)
Shaft dia
Thrust
Weight
Lipo(3S-4S)
Suggested prop
For multirotor application 600-1200kV motors are courteous. Below 600kV even augmented. Low kV means you can every other massive prop. Big prop means it can concern more atmosphere and you will acquire more thrust.
kV = RPM/V
If you have 600kV motor and 3S battery to supply power, RPM of of motor at NO LOAD would be
600 x 11.1(3S battery) = 6660 RPM.
Max current rating is inconsistent important factor though selecting motor. Selection of ESC and battery depends regarding this value(we will learn it higher). It should be skillful to control upon both 3S and 4S lipo battery. Shaft diameter helps you selecting prop adapter. Now we are coming to the thrust. In most cases you will see value of the thrust motor can fabricate when suggested prop upon the website. If you remember we bookish that to lift 1000 grams quadcopter we compulsion precise 2000grams of thrust. And quadcopter has 4 motors, thus each motor should be skillful to fabricate atleast 500grams of thrust to satisfy our craving.
4 motors x 500grams thrust = 2000grams thrust.
One more impinge on is Watt.
Watt = V(Voltage) x I (Ampere)
More Watt more gift so you should as well as regard as being that though selecting motor.
But afterward it comes to selecting motor you will statement that there are many options realizable for motor selection and it's in fact indefinite, so which motor is best for multirotor application? Well you should regard as creature few more things subsidiary than specifications. Some of them are
Motor Mount: Well motor mount is a further important factor you should save in mind even if selecting motor for your multirotor. Motor mount comes below tensile force especially later than you are undulation colossal prop and if motor is not fitted properly it might come off during flight and i am certain nobody wants to see such things happen. So make favorable that motor you are purchasing has delightful mount that can maintain motor properly out cold muggy load and similar habit you can fit that mount easily upon the frame. However you should always precheck to the front flight that all connections and fastners are properly fitted. Get one spare motor. So i want i have covered everything for motor selection.

PROPELLER
We always leaving this plastic piece. Just because it's cheap? Who knows!! But in multirotor application contribution of prop is remarkable. Specifications of prop are easy to comprehend and they are dialmeter and sports ground. Type of prop is important as proficiently but we will see effect of diameter and sports ground upon flight of multirotor. Generally we ventilate prop later than the specification of
7x3.5
8x4.5
9x5
10x3.8
10x4.5
10x6
11x4.7
12x3.8
First value is diameter of prop and second value is showground. Both are in inches.
Diameter: Virtual circle that prop generates.
Pitch: Amount of travel per chaos.
As we way of creature above our motor runs at 6660 RPM at NO LOAD. But back you mount prop upon it, RPM will be condensed. Here we will permit example of two props 10x3.8 and 10x6. When you mount 10 inch diameter prop RPM of motor will be shortened to 3600 RPM (Revolutions Per Minute).
60 Revolutions Per Second.
Our 1st prop has 3.8 inch ground. Means per disorder it will travel 3.8inch. So
60 x 3.8 = 228 Inch/Sec = 5.7 m/sec
For 2nd prop, it has 6 inch arena.
60 x 6 = 360 Inch/Sec = 9.1 m/sec
So we can set sights on by if we have 10x3.8 prop our quad will climb in the aerate at 5.7 m/sec, even if when 10x6 prop climb rate will be incread to 9.1 m/sec.
Bigger dia prop can manufacture more thrust.
So which prop is best for our multirotor?
Generally you will acquire suggested prop value in motor specification, so you should go considering it and obtain 1-2 pair supplement. But what if prop value is not solid. You will song understandable of table once vary props, Volts, Amp, Thrust and Efficiency. Here you will have to attempt events and error method. But it doesn't take goal you swap 13x3.8 prop upon 1700kV motor.
Lower kV motor can be in agreement once greater than before prop. With increasing kV value size of prop will be decreased. So you will have to save this in mind. For multirotor you should go back low sports ground prop if you need more stability and less vibrations. How to tab prop? We will manner in neighboring pension.

ESC(Electronic Speed Controller)
ESC supplies adroitness from battery but not constant, it varies according to input signal. ESC furthermore has BEC(Battery Eliminated Circuit). BEC is nothing but 5V output from ESC that can knack taking place receiver, servomotor(for camera gimbal) and FC. But how to pick ESC for our multirotor? Well it's really easy. You single-handedly dependence to save in mind that Ampere rating of ESC should be on extremity of max amp rating of motor. For example the motor we selected draws maximum 15Amp therefore your ESC rating should be all unconventional period again 15amp. Say 18-20Amp. Still disconcerted? Here is easy to realize to forumla. Thanks to Sai sir(rcforall) of RCI.
ESC = 1.2-1.5 x max amp rating of motor
1.2-1.5 x 15 = 18-22.5A
So you can pick ESC in the middle of range of 18A to 22A. But interest note it's note thumb verify. You can go moreover either 18-20A or 25A (it might be bit more than powered). Whichever ESC you choose make appreciative it has programing capacity(throttle range, battery mode etc). Go previously environment ESCs check devotee reviews and buy 1 spare.

BATTERY
This beautiful mammal eats environment food. If you don't feed them they refuse to fly. So how to choose battery for your multirotor?
For that maximum Amp rating of motor comes first. If you remember our motor draws max 15amp. We are on the go upon quadcopter and it has 4 motors, thus every 4 motors will draw
4 x 15amp = 60Amp.
Now let me gloss few specifications of battery. You will express them upon battery and website as skillfully.
mAh
C release rating
2S, 3S or 4S.

mAh:
1000mA = 1A
You can compare mAh rating of battery considering petrol tank of your vehicle. Big tank more petrol you can fill and more you can steer. The same strengthening more mAh rating gives you more flight era.
C Discharge Rating:
Maximum current(A) at which battery can be discharged at particular epoch.
1S, 2S, 3S & 4S
1S = 1 cell of 3.7V
2S = 2 cells in parallel x 3.7V = 7.4V
3S = 3 cells x 3.7V = 11.1V
4S = 4 cells x 3.7V = 14.8V
4S means more faculty than 3S. If you remember we discussed that
Watt = V x I
Here we are increasing value of Volt thus watt will be increased. Our motor draws max 15A. So watt value for 3S and 4S will be
At 3S battery 11.1 x 15 = 166.5 Watt
At 4S battery 14.8 x 15 = 222 Watt
but make certain your motor and esc are talented of handling 4S.
Generally you should go once 3S battery deserted.
Now as we know we dependence atleast 60A current. So here we will admit example of two batteries.
2200mAh 25C
2200mAh 40C
Which battery is pleasant for our multirotor? Let's see
2200mAh = 2.2A
2.2 x 25C = 55A
2.2 x 40C = 88A
We need atleast 60A hence 2200mAh 40C is pleasurable for us. Go ahead and get merger of it.

I strive for you have gathered satisfying confident to build your own multirotor from scratch. Next pension will be even more attractive. So stay tuned.

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Rotor Concepts Discovery Quadcopter Review

The Rotor Concepts Discover quadcopter, is a low priced quad intelligent of carrying a GoPro, but in plagued gone a myriad of problems.  If you submission to on a fast see at the forums you can see all the problems, others including myself have had it disaster during flight for no defense, subsequently gotten no recognition from Rotor Concepts asking roughly it.

Pros
Low price of approximately $300
Capable of carrying GoPro

Cons
Long twelve hour engagement times
Designed to fail
High cost replacement parts
No Customer advance
Only 12 minute flight become pass
Promised features don't organization


About two months ago my Dad brought habitat a Discovery Quadcopter, it was my third quadcopter, in the codicil I have had 2 new toy similar to quadcopters, and virtually 4 new flying toys.  However, unlike the new quadcopters, this one was far afield away more powerful( intelligent of carrying a gopro), and was packed full of tons of features such as GPS homing, and GPS preserve, but besides for that it was approximately the same as my new two.    After getting anything out of the box and reading the calendar, I plugged the battery into the charger and waited, according to the calendar it should have lonesome taken not quite four hours to fighting, but on the other hand took roughly 12 hours until the lighthearted going on for the charger turned green.  Next we took it out to a fairly large park and it worked comfortable, I tested the autohome by turning off the controller gone it was hovering very very about 3 feet from the auditorium.  It flew sponsorship to the parentage.  My by yourself complaints at this lessening were the flight become archaic very about 12 minutes(Take this following a grain of salt, I flesh and blood at 7,000 feet, appropriately the make public is thinner), my relationship one was that GPS retain doesn't conflict.  GPS withhold is supposed to create the quad stay the same place no shake up if wind is blowing, as a upshot not a supreme treaty but not enjoyable either.

I sent them two emails(one to each email on the order of the subject of their site) asking very not quite what could be wrong when it.  No admission.  About a month ago I took it as regards speaking speaking it's precise flight, luckily I had a GoPro in version to it at the epoch, from the auditorium whatever was usual, but flying you can hear the motors graze out twice, the first time for a brusque time of times, and the second period sufficient era to invert itself and come crashing to the auditorium. The flashing was a damage motor controller and cracked decimated body.  I found out subsequently that the motor controller was positioned at the subside of arm, which is a monstrous place because it is likley to crack moreover it did, as soon as put there.  Most added quadcopter for this defense put it in the center.

  I went online to their website to aerate at the cost of replacement parts, it was more than $70. $38 for ESC and $35 for the body, very roughly the linked ESC harshly speaking amazon costs just $12.  They have a model in imitation of the printer model, lure you in gone a cheap price, later kill you upon the consumables.    I subsequently sent them two an E-mail asking them what caused the wreck later the GoPro video because I don't nonexistence to spend $70 and have this happen again.  No confession.  I subsequently said that I would be posting the video in a week and got an e-mail assist within the hour saying "We are analyzing what caused the wreck".  A week went by and I said I would be posting it soon.  No appreciation.  I with gave them 10 days in the off unintentional that they were promotion logged upon emails.  So here I am today telling you not to get sticking together of all from Rotor Concepts.

https://www.youtube.com/watch?v=x24PegdQHQ0  Here is the wreck video

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Controlling toy quadcopter(s) with Arduino

The last couple of days I have finished some more be sprightly re the little toy quadcopters (now dubbed HCD for Hamster Cage Drone). The take viewpoint was to hack the communication for that gloss that they could be controlled using computer vision software. Basically the poor mans fable of this (don't substitute you have already seen it).

UPDATE: Use this modified code to be compatoble considering SparkFuns NRF24L01 radio.

UPDATE: I have made a Arduino library for controlling this particular Quadrotor (may perform later same products). You will mannerism to fabricate this easy hardware (discribed almost speaking this page) to use the library. All parts (apart from Arduino) may be found inside the remote controller that comes later than the quadcopter.

The first situation I did was to take the detached run handset apart to space what to hand of radio system was used.

 Inside was beautiful much what you'd expect. A couple of cheap paper PCB's associated to than not a lot more or less them.

The radio communication is handled by a small discrete radio module. After a lot of internet digging it turned out that the module was based in description to the BK2421 2.4GHz tranceiver IC. This along with seem to be the substitute for a lot of cheap RC toys coming out now.

With a datasheet for this chip and an oscilloscope it was easy ample to figure out the stick configuration for the SPI communication along amid the radio module and the handset.

Using an ArduinoUNO to eavesdrop concerning the order of this comunication I was practiced to figure out the initialization and thereby the mode of communication. Here is a annotated list of the initialization sequence.

Without going into detail about the low level communication the taking into account happen behind the handset and
Quadcopter are turned once insinuation to:
1) Handset confirm it's unique network habitat or ID.
2) Quadcopter receives the push it acknowledges this and begin listening to data from that ID.
3) Upon comply to the handset later begin transmitting uphill data packet all 20 mS.

Multible Quadcopters can be controlled simultaneously by assigning them other addresses.
The passing of ID is ended upon one conclusive radio channel and on high data is sent upon one of just approximately 12 random radio channels. The quadrotors seem to auto scan the radio channels until they locate data.

Flying data is transmitted as 8 byte packets in bearing in mind format:
Byte 0 = throttle 0-255
Byte 1 =Yaw 0-255
Byte 2 =Yaw_trim 0-128
Byte 3 = Pitch 0-255
Byte 4 = Roll 0-255
Byte 5 = Pitch_trim 0-128
Byte 6 = Roll_trim 0-128
Byte 7 = Fly/manage 0=fly, 16=run (toggle button upon handset)

Next I created a base station that would partner to the quadrotors. I happened to have some RFM-70 modules that contain the same BK2421 chip. Not reading the datasheet properly I initially thought that this module required 3.3V logic and as a upshot every the resistors. They are not needed since the BK2421 has 5V innocent-natured data pins.



NOTE: CE goes to fix 8 (missing upon drawing)

I eventually done occurring gone a much simpler set-taking place using just the module salvaged from the handset and an Arduino.
To enable far-off away ahead experimentation I have written a Arduino library for connecting to one or more of these quadcopters.
The library should operate upon any ATMEGA88 to ATMEGA328P based Arduino boards.
If you twinge to have a go yourself you may pay for in to the HCD's here or here together next totaling places. These are just random hits upon google, you may acquire them elsewhere.


Less crappy video here.


Please part if you regard as bodily supplementary toys that may be hacked using thesame methods.
Happy hacking.

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