XK K127 Eagle 4 Channel Stabilized RC Helicopter Flight Test Review
I a hitman p o w m. I a was first to say first in one of my recent videos and thus wins this shout out. So congratulations good morning, quadcopter 101, here with a review of another neat rc aircraft. This is the xk k127 helicopter. Four channel helicopter uh meant for beginner flyers, that’s what’s cool about it that’s. What i kind of like i like to see drones that are drones and rc products meant for beginners, keep in mind. The quadcopter 101 channel is dedicated to beginner flyers, bringing beginner flyers into the hobby of rce aircraft, so the xkk 127. What is it again? I mentioned it is a four channel beginner’s rc aircraft when i say four channel. That means it has control throttle for up and down movement. It has control of uh, rudder or yaw for right and left turning along with control of pitch and roll. Now the thing about this is, it weighs only 51 grams, which means this does not require registration in most countries, there’s no camera attached to it and it’s less than 250 grams, so most countries will not require you to register this particular aircraft, which is another good Thing about it now it has fly bar stability. What fly bar less stability? What does that mean folks, uh on older helicopters? They had a device that used centripetal force or centripetal acceleration to automatically maintain stabilization. That was the old way of doing it. The new way of doing it folks, these days this has built in gyros and built in accelerometers, very micro, micro, gyros and micro accelerometers that measure any deviation of pitch roll, also any accelerations from say gusts of wind and will automatically maintain stability aircraft via electronics.
Instead of a mechanical means such as a fly bar uh helicopter that’s becoming more or less standard i’m seeing more on helicopters these days, but that’s makes it also very easy to fly by beginner pilots in that this particular aircraft is stabilized from if it tries to Roll over or flip over, it will automatically compensate the level itself, especially if it gets hit by gusts of wind. It will also do the same trying to maintain a stable hover, although it cannot automatically hover in place horizontally. You’Re going to have to manually fly that, but it will try to maintain a horizontal position automatically. If you let go of the sticks on the controller and how is it done, how it does does it do these controls uh? Well, it has a swatch plate. Folks, that’s this gadget right here that automatically changes the pitch of the blades as they’re, spinning through the through their 360 degree rotation and say if it wants to pitch to the left. This blade will win or if you want the helicopter to roll to the right. In this case, um, the blade is squashed or switch moves by the left side will increase pitch, while the blade on the right side will will decrease pitch, increasing, lift on that side of the helicopter, decreasing on that side of the helicopter, so that’s how a swashplate Works, however, this does not have swashplate control of cyclic or, like i’m sorry, it has cyclic control for those pitch and roll controls, but doesn’t have collective control.
Collective means it would change the pitch of the blades, both on throughout the 360 degrees and that’s used for increasing the lift to raise or lower the helicopter. But that does not have this helicopter doesn’t have that capability. Instead, elevation of the helicopter is controlled by increasing the speed of the motor and decreasing the speed of the motor that’s, a little trade off there to keep the the drone simple and reduce the cost of the helicopter. I’M. Sorry i said drone didn’t, i okay one other thing: this has: it has altitude hold control and what that means is you don’t have to mess around with the throttle to maintain an altitude once you’re in the air? If you let go of the throttle, stick, it will automatically maintain that altitude for you, so you don’t have to mess around because uh other uh helicopters doesn’t have don’t. Have a health altitude hold control? You got to do a lot of uh adjustments of the throttle to try to maintain that altitude. This one will automatically do it by itself. It has a built in barometer pressure sensor, which air pressure sensor, which uses that information from that sensor to automatically maintain the altitude of the drum it does have one key takeoff and landing capability. Which means you press this button here and will automatically take off and maintain a hover of about one meter in height and if you want it to automatically land, you just press that button again and the drone or the helicopter will automatically descend and land itself um.
The it is powered by an 8520 motor at this point, let’s take off the hood here to show the insides here, the underside inside of the helicopter, but it has a 8520 motor it’s, a plug in motor, so that you should be able to easily replace this Motor if it burns out similarly, this tail boom, somehow tailbone motor is a 6520. I believe no 615 motor, but this supposedly comes out too for easy replacement, although i haven’t tried it yet and i’m not going to until i fly this particular to see how that replacement is done, um, it is powered by a 3.7 volt 400 milliamp per hour Battery as you see here, and that should provide it up to 16 minutes of flight time now, most of you have seen me review the uh eachine e129, and that is a very similar helicopter to this particular helicopter. However, there are some differences and i’m going to try to show them to you here, pulling off the top first off. We have a different flight control board on both of these. Here. This one seems to have something set up for wi fi. I believe they were planning to put wi fi fpv on it, which they never did, but it has a wi fi port right. There um for this particular helicopter um. Additionally there’s some there’s a lot of a lot of minor differences. It looks very similar, but there are minor differences in parts throughout the helicopter, such as this tail motor.
You know it’s a different design than what’s on this particular one uh. How the uh rotor head is attached to the mast here is different and we got screws on this one and this one we don’t seem to have screws and what i’m trying to say is folks there’s. You know, although it looks very similar, i don’t think these parts are interchangeable between the two um, even the main gear, on the uh on the uh off the main rotor blade here is a slightly larger in diameter than what is on the eachine version of this. So you know you can’t, even change that either so again, very small design differences between the two such that that you really can’t interchange the parts between two. I wouldn’t recommend doing that. This includes the battery too. By the way, the batteries are very similar, both similar in shape, but the eachine one is slightly smaller in dimensions, although it has, i believe, it’s the same. No, i think this battery is bigger in this yeah it’s a bigger battery in here. I can see it so, but both of these are um charged via this micro usb port. Here, if you can see it there, but uh again, the difference is between the two there’s, these little uh bumps on the top here that prevents you from sliding it any further. It actually holds into place here. So again these cannot be interchanged. The batteries cannot be interchanged between the two and also, i think the polarity is different too.
I tried using the charges from the this one here. The k127 with e129 battery and didn’t want to charge this particular battery. So that tells me polarity is probably different too. So i would not recommend trying to plug this into that. You know the uh eachine battery into the wl toys helicopter, because you, you probably have problems here x, cape helicopter, i’m, sorry so um. What else did i want to mention here? Okay, i mentioned the battery let’s mention this truck let’s talk about this charger. It comes with a charger of course, but do not try to charge, even though this has a micro usb port on the battery. Do not try to charge this with a regular micro. Usb cable instead use this charger and the reason being this charger has a built in detector. Here that detects when this battery is fully charged, and you know, will cut off the charge going to the battery. If you try to use a regular micro, usb cable with this battery, you will likely over charge it and damage the battery. So i don’t recommend you doing, in other words, use the battery charger that’s, provided with the helicopter to charge the battery. So let’s go over. What you get in the box, you get the instruction manual it’s in chinese and english it’s very basic, but uh. If you watch my video, you should be able to see how to get this into the air. You get the helicopter, you get one two or three batteries, depending on which package you order.
If you want spare batteries, i recommend ordering them at the time of purchase because it’ll be difficult to have these ships separately without the drone. Because of lifting or shipping restrictions. You get the battery charger, you get a pack full of spare parts, including another main gear, and a spare set of blades, along with tools to change uh parts on the drone, and you get the controller now. The controller also is different than the controller that comes with the issuing version of this helicopter. In fact, it is powered by six batteries. Six double a batteries instead of four uh that’s the thing that wltoys seems to always provide too much power for their transmitters, but this should give it plenty of range. However, keep in mind, i would not. This thing will get very hard to see as you get out to about 70 80 meters, so i wouldn’t try to see how far this will fly, because you will lose sight of it easily and this does not have a gps to bring it back automatically. So keep this drone within sight at all times, folks or this helicopter was in sight at all times, but let’s go over the buttons on the controller. This button here is for rates. If you want to fly faster or slower, you press this button here and let me mention real quickly comparison and flight performance between this and the eachine version is very similar, except in high rate, when you go to high rate um.
The yaw on this is a quite a bit slower than what you get with the yaw on the eachine version. The eachine version is actually kind of an insane yaw it’s too fast, even for advanced pilots. I think uh. This is more sensible. We are rate in high, so um that’s, the one difference that i saw between the flight performance of the two additional things. The button on the right here is for automatic takeoff and landing. There are also two other buttons here that do nothing just let you know and um the buttons on the controller itself. This is uh. Actually, i believe it is throttle throttle trim along with yatrim pitch trim and roll trim, along with controls for throttle up and down, throttle, left or right, yaw or rotate, and forward back pitch and left and right roll, so that’s the transmitter. So that is the w or actually xk, k127 and actually wl toys does own xk. So when i say wl toys, that’s, there’s reason but uh let’s take this helicopter out into the field and see how it flies. Actually. I’M gon na probably start downstairs in my basement and then we’ll, take it out in the field and see how it flies so hope you enjoy these flights. Okay. The first thing we need to do is start up this helicopter and again we’re going to trim this up indoors, uh it’s important to trim this indoors uh for your first flight.
In that, if you go outdoors, the wind is going to affect that trim. Okay, you want to have a windless day to or without any wind to trim this up actually push that battery in too far we’re not ready to fire this up yet, but again, uh trim the helicopter uh indoors without any wind that’s and then take it outdoors For your fly, so to start this up, we need to turn on the helicopter by pressing the battery in until it connects and it’s connected now and then put the helicopter on a flat level. Surface then turn on the transmitter and connect the transmitter notice that uh helicopters lights blinking rapidly, and so is the transmitter light blinking rapidly, but to connect the transmitter to the drone or the helicopter move the throttle stick up and then down and now we have a Solid light on the controller and a solid light on the helicopter telling us that the helicopter is connected to the transmitter now to take off. All we got to do is press this button here, one time and it takes off and we notice we have some forward drift. Let’S go up a bit higher. We have some forward drift quite a bit forward drift and some uh left drift. Okay to counter the forward drift, we need to trim it and the way we’re going to do that is the this trim button here, we’re going to pull back repeatedly until that forward, drifting stops and it’s drifting to the left too folks got to counter that by.
Let me take it up a little bit higher by pushing this button here to the right. Okay, let’s bring it back, so you can see it see if that drifting is stopped. No, it is not so back back back. Okay, i think i got it now back back and right and we’re pretty much trimmed up. Okay, so let’s flatter on indoors here relatively easy to fly, but i recommend taking this one outdoors. It does have the ability to fly outdoors very well. Okay, it has good yaw rate and good pitch rate, especially in high when you set at the high rate notice. My tomatoes they’re still indoors here, i’m setting i’m getting ready to transplant them outdoors here folks shortly, but um let’s see what the rate is on this. Okay, this is a low yard rate. Let’S go to high and that’s high ur rate again on the um eachine version, this spins real very rapidly, but this is a more controllable yaw rate, especially in high rate, but since we’re indoors, i’m going back to low and right now, oh come on let’s! Think about barometer controlled helicopters and drones, especially when you’re flying them indoors. They like to get sucked up in the ceiling. I don’t know what that is about the barometer. You go outdoors it’s, not a problem, but something about pressure changes as you get close closer to the ceiling with these, so okay, so it’s flying nicely let’s see if we take it around the pole here around the indoor flight test facility here, quadcopter 101.
Okay, trying to lift right forward back everything’s working on this, so we should now be able to take this outdoors folks so get ready. Let me we’ll do an automatic landing of this by pressing the landing button here, try to get it on the pad and there you go that’s the automatic landing so that’s the indoor flight now let’s, take it outdoors and see what it really can do. Folks, i’m, going to recharge that battery get a full battery, so we can also test what the flight time of this uh helicopter is so hold on. Folks, while we do that good morning, quadcopter 101 here and welcome to the flight test of the outdoor flight test, the xkk127 okay to fire, this up – all we need to do is push in the battery, and then we notice the light flashing on the or the Helicopter keeps saying drone it’s a helicopter, and we turn on the transmitter lights flashing here and we bind it by going up and down on the throttle. Now this is connected to the helicopter. Now we need to do is take off is press. This take off button and flat. Now we do have a little bit of a breeze here today, not too much but let’s. Take it up a bit higher, showing up close okay. Now this is low rate, even with a little breeze here, it’s flying well now one thing about this helicopter folks um the throttle – it is a beginners and this throttle is very uh, nerfed, okay watch.
I give it a full throttle and it goes up slowly and inversely. When i reduce the throttle, it comes down slowly, okay, now. What does that mean? That means for you, beginner flyers, do not send this up high. Okay, you will lose your orientation on that. Then you’re going to try to bring it back down to the earth and uh it’ll take forever to get back down. If you send it up real high, so i recommend keeping it below house level, especially if you’re flying in your yard, uh don’t go above the house. Now the wind is picking up a bit. I am going to increase the rate by pressing this button here here. Two beeps now this is going to fly a lot faster folks and turn a lot faster, as you see there so now. This is for intermediate flyers when you go to higher rate, and it works well in the wind when you’re flying in the wind let’s go around new york or they, the cul de sac, here coming back coming back, see how it stops on a dime with that Higher rate now again the um, what was the other eachine version of this, and this high rate when you try to fly the yar rate was just way too much and most people, just wasn’t able wouldn’t be able to control it with a high yar rate. But this yar rate is just perfect: okay for um the high rate, especially for windy days.
So you can it’s more controllable. Let’S go around the cul de sac again coming around coming around going around the neighborhood and coming back full speed and into the house bounced off the house there. So oh wow, you know i’m, not as good a helicopter pilot as a drone pilot. Actually, a lot of people that fly helicopters are laughing at me right now, because they’re saying that’s, not a helicopter, you know it. Doesn’T have collective control and you’re, not flying 3d and yeah. I can’t fly 3d folks it’s and you can’t fly 3d by the way with this particular helicopter, because it doesn’t have that true, collective control, where you can go inverse pitch on the blades. This one doesn’t have that capability it’s, just up and down only so let’s bring it in close again let’s check, okay, that trim still working out relatively well from what i did yesterday flying indoors. So, okay let’s try some tricks here with this, namely i already did a trick here. I kept it in the air after hitting the house, but let’s fly around the house once or my front porch going up a bit higher and just slalom along the porch and the bird poop on my porch. I just noticed i got to clean that up. Coming back down going around going there and going hot bun okay for the remainder of the flight, i am just going to sit right here. No, no! I won’t let’s go out in the grass.
I was going to sit there on the porch, but now we want to get up close to this thing while flying but doing nice now again for you beginners, you are going to need to learn, stick control, so this is back forward right, slip left slip and Again on the left, stick is yaw or rotation and throttle up and down. So you know as a beginner it’s easiest. If you keep the back end of the helicopter, pointed toward you like this and then you can. You know your right. Stick left, stick back and forward is proportional or or directly related to the way your orientation on the helicopter um. It gets difficult if you’re putting nose in like this, because people say the controls reverse and they do. But the way i envision it is. I imagine myself being in the helicopter and that way i can. I keep orientation on which way to turn. You know just got to use a little bit of imagination. Another trick is, if you’re far far enough away that you can’t determine which way the helicopter or drone is pointed just push forward, and if it’s moving left turn left until the movement stops and it’ll come back to you. Similarly, if it’s, if you push forward and notice moving right, just turn right and it’ll come back toward you until the movement stops, you turn right just a quick way to maintain orientation on a helicopter. This is actually flying nicely.
Folks, let’s do some funnels with it and again. This supposedly has a 16 minute flight time on the eachine version. You see one had a 15 minute flight time so similar flight times, although this has a bigger battery, so i wouldn’t expect it or it seems to be bigger. I can’t remember what the milliamp per hour was on the uh. Eachine i’d have to look it up. It’S, climbing climbing hit some wind there and now notice i’m, getting a full down, throttle it’s, taking forever to get back down so again be careful folks, especially beginners. If you set it up high, you might have a hard time coming back down again. So in that case, if you get hit with a gust of wind, while you’re way up high there, you might lose this helicopter so keep it down below level of the houses. So if it does go wacky on you or if you lose control on it, you won’t lose it unless it ends up on your neighbor’s roof, and that happens too by the way it’s happened to me several times, especially back in california, so yeah you folks out There tell me your stories of your drones, ending up on neighbor’s roofs or in your yards coming back coming back coming back, zoom yeah it’s a this is actually a nifty little drone. This xk version x again, especially like the high rate on this as compared to the eachine eachine, is uncontrollable, in my opinion, almost uncontrollable in high rate, but this one, this one’s nice sporty and controllable, not insane yaw and it’s long flyer now um again.
This supposedly has a range out to about 150 200 meters. You’Re not going to be able to see this farther than 60 70 meters smoke, so that’s that’s way overkill not needed. In other words, so they could have probably gotten away with reducing some of those batteries. In here six batteries, but then again the charge on those batteries should last a long time there. Since you’ve got six of them in there providing power there we go up again. I gave it too much throttle and takes forever to come back down again nice little helicopter by the way the wind stopped there’s, where that trim indoors comes into play. Trimming us up indoors without wind, because here let’s bring it back toward me, tilting it back, but it’s holding this position up there nicely let’s even get a thumbnail up in the sky: okay, okay, the sun’s starting to peek out from behind the clouds. Finally, we had a lot of rain up here in here for the past a few days, it’s been cold too, but that rain has stopped wind stopped. It was real windy too. So am i flying my helicopter in my front yard? Why not nice? For those of you wondering where i’ve been for the past month, i had a family emergency crop up that i had to take care of. Unfortunately, a family member passed away and uh that’s, where i’ve been but i’m back now: okay, we’re, not in the street.
Now, coming in coming in, actually, i kind of like this one: this is a fun little helicopter. I don’t think i’m going to get rid of this one. This is fun even though it’s got altitude hold quite maneuverable and fun to fly. Let me do some slaloms with this going through the trees winds hitting it wind’s hitting it winds, a lot of wind over there let’s stay in the front yard less wind over here. One two seven fun know the past couple years year, one two years here: these helicopters have gotten really good before they weren’t so hot or they were difficult to fly now, adding these fly barlest ones and they finally putting in stabilization systems, make it easy for beginners And enjoyable actually to fly. I used to have a lot of sport. Drones were fun to fly and they’ve got. Drones, have gotten boring these days, just too um too stable to fly. You want to have a little bit of nimbleness like this, so you can do some sport flying now. The next thing is, i need to put some type of flip control on this. I know they could do it with this. One add a flip feature with the one two, seven um, something where you put the in the cyclic, so that’ll put extreme cyclic, so it’ll roll or flip. You know extreme left, that’s, probably coming that’s, probably in the works. Folks, i can, i can see that just a flip feature – not inverted well – maybe maybe i’d invert it too, but 6g controlled inverted so that you beginners can do it.
So so the 127 not too bad somewhat fun. Just gon na hover it for a bit, bring it in closer, so you can see it left. Left roll left, roll left roll going up a bit higher, so fun little helicopter and a long flyer. I don’t know how long we’ve been flying but it’s getting up there. It was real windy this morning and then just stopped. So i said, i’m gon na come out here and fly cool here’s a fun one funnels going down the funnel going on the photo and up. How do you do funnels folks? Yeah go diagonally on the sticks. Both sticks like this that’s. How you do a funnel and then give it throttle, so it don’t crash okay. Now, when it’s doing those funnels, it might start to descend and when it does just stop the funnel and give it a little more throttle, it starts getting close to the ground that works the same for drones by the way you just go. Diagonally, like that, and you can do funnels, those are stabilized drones. I mean so let’s just fly around the yard, bring it back down too high too high too high fun thing: coming back down and zipping more funnels, coming back down, huh i’m breaking my rule. By going above house height, but here we come back down again try to keep it below the houses, the height of the houses, so you don’t lose it folks.
So let me go around my tree there coming back toward us and stop it there and yeah it’s been flying close to well there we go that’s it’s flight time. Finally, i was wondering when this thing was going to die so that’s the k127 from xk nice little helicopter hope you enjoyed this flight it’s quadcopter 101 signing out hi quadcopter 101, here again, hey! If you want to get your own shout out in one of my future, videos make sure you subscribe to my channel it’s real simple, just go to my channel page and click on that subscribe and also make sure to click that bell button right. Next to the subscribe button that way you get notified when i release a brand new video immediately and give you a chance to get that first, shout out so give it a try.