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|Scorpion Power||Ron's RC Helicopters||Thunder Power RC|
IntroductionIíve always wondered how is like to fly ďbigĒ fixed pitch flybar helicopters. I have several V911 which are a breeze to fly. I progressed to a KDS 450QS and it was a whole new level in terms of control and speed. After mastering non-3D flight with my 450, I thought about this - what happens if a V911 is enlarged? Would it be more challenging and more fun to fly? Iíd like to find out if this helicopter is a worthy upgrade from a V911.The package is huge! It was as tall as my 1.5 year old son!Tmart did a nice job in protecting the package by providing additional bubble wrap at the vulnerable part of the box. Good job!The foam box was rather tightly secured to the cardbard box, but the effort in pulling out the foam box was worthwhile.V912 vs the RestThe bird is huge, when it is compared against V911 or V922.
Smaller brother V922 and bigger brother V912.But when I took out my 450, we know who is the boss!Donít you just love BIG helicopters?
|01-10-2013 Over year old.|
Up Close with the V912The bird is heavy. For a start, you can find mostly metal pieces on its body. It also has a huge 2S battery and a monstrous main motor.
The two servos and swashplate did not come perfectly level. It is a must to level the swashplate. Do not depend on the electronic trims (on the TX) because you need them for quick trimming when youíre in the field. If you used up all your electronic, youíre out of luck!If youíre not used to reparing helicopters, it could be quite painful to sort out the servos. Like my 450 heli, I wanted to level the servos. I examined the bird in detail to find the best way to extract the servos out of the body. In the end, I took the shortcut - I left the servos in the body while I removed the servo arms. Itís hard to do that, especially when you have fat fingers.I set all trims to neutral and powered up the bird. After it initialized I took out the servo arm and tried to put it back at a horizontally level position. To my disappointment, there is no way to do that. Itís either too high or too low. And there is no subtrim to fix this. I picked the lower position for both servos. Bad idea.After putting everything back, I realized to level the swash, I had to lengthen the linkage rods. And I needed to lengthen quite a bit which made the linkage rods on the verge of separating! I was lazy and left it that way.In the end, I got a horizontally leveled swash.Saying the tail blade is big is an understatement. I have no worries of its heading hold ability just by looking at the size of the tail blade.The receiver board mounted horizontally above the huge battery. There is a spare connector for additional LED light.The battery could be removed for charging. This may be required if you intend to charge it with your computerized charger and you find that the JST and balance lead are too short. But if intend to charge with the stock charger, it should not be a problem.The head light is very bright. It blinded me when I tried flying it towards me at night.
|01-10-2013 Over year old.|
TransmitterLike the V922, this transmitter is a big leap from the previous E728. It looks and feels like a hobby grade transmitter.
6-Channel Transmitter for V922 vs 4-Channel Transmitter for V912It supports Modes 1 to 4 - throttle and/or rudder can be on the left or right stick. To switch between modes 2 and 4, while it is powered off, hold on to the ďLeftĒ button at the right of the LCD display, then power it on.Iím pretty disappointed with the transmitter. I was hoping that it could support configurable rates. To toggle between the predefined low and high rates, press the top-left corner button.Low rates are only suitable for indoor flight where there is no wind. But you really wouldnít want to fly such a big heli indoors. At high rates, the helicopter flies fine outdoors.
Strangely, the lights button doesnít on or off the lights despite showing the status change on the LCD display.It has the same annoying start up beep like the rest of WLtoys 4-channel transmitters. It was able to bind with my V939 but I didnít have the time to fly my quads with this transmitter.Flight ExperienceAvoid applying throttle too quickly when spooling up. Give the tail some time to kick in. But take note that the helicopter lifts off at 45% to 50% throttle.Like the V911, it drifts left as it lifts off the ground. However, the left drift is much more pronounced in this bigger bird. Just make it a habit to apply right aileron as it lifts off.While it is hovering in the air, it needs around 40% throttle. Iím not exactly used to flying helicopters at low throttle. What this also means is that the bird has plenty of power. I gave it a 80% throttle boost and it rocketed up into the air. I donít remember my V911 to be able to do that.At the ground effect zone, the bird is not as stable as a 450 CP helicopter, but is easier to handle than the V911. But avoid lingering at low altitude as you really need to be very familiar with the required throttle inputs in to prevent hitting the ground.Piros are surprisingly fast. You can see this in my video. The bird does not have the same overly sensitive rudder as the V911. You do not need to concentrate on applying small amounts of rudder during banked turns.Just like the V911, right banked turns are very easy to pull off but left banked turns are tricky. Itís gonna take me a while to get that right.Cyclic stick movements are like the V911 - not too sensitive - and the bird is easy to move about with the elevator and aileron controls.Forward flight feels a little harder than the V911, perhaps because the tail is heavier than the nose. As the helicopter stops, it seesaws slightly, again may be due to the heavier tail. I checked the center of gravity and found the tail to be very slightly heavier than the nose.
Perhaps I could improve forward flight by removing the tail boom support brace and the tail horizontal fin.Iím not sure if all fixed pitch flybarred helicopters canít handle winds well, but for my V911 and V912, they are quite affected by light gusts of winds. However, I do notice that the V912 performs better in windy conditions that V911. As a safety precaution, apply the wind-countering stick movements when the wind starts blowing. It takes time for the helicopter to react to it. If the wind is gentle and does not affect your flight, you may apply counter stick movement to correct the wind-countering stick movement. If you managed to counter the wind, good job. Else, the wind is too strong for your helicopter, land it. Your resistance is futile.Remember, this is not a V911. If you lose control, either the heli is gonna get hurt, or somebody, or something is gonna get hurt. Did you see how big the metallic flybar is? And letís not forget the metal landing skids.It was a unique experience flying a large FP FB helicopter. Itís definitely more challenging than a V911, because of the heavier weight and corresponding higher inertia. Anyone who is overly familiar with a V911 should start off this helicopter really slow. You donít want to discover itís ďdifferentĒ when the large, heavy bird is in a difficult to handle situation.Now that I shared my thoughts on the difference of flying the V912 vs V911, letís visit the next question - is it a worthy upgrade from a V911?Progressing from V911 to V912The short answer is - YES!If youíre looking for a more challenging FP FB helicopter, most likely youíd like a bigger one that handles wind (slightly) better, and demands more of your focus and attention. The consequence of crashing a V912 is far greater than a V911 so this adds on to the challenge of flying a V912.As this is a larger, heavier, more powerful bird, it can fly at a much faster pace. This can be really fun to you adrenaline junkies out there. I tried tight U-turns with this bird and I must say the feeling was great! The sound of the main rotor blades cutting the wind, and the tail blades working really hard, as the big V912 U-turned right in front of me, was extremely thrilling. I think it was captured in my video.Iíve flown collective pitch helicopters to know that it is (obviously) different from a FP FB helicopter. Iím also aware that there are folks out there who canít seem to pick up the skills to fly a CP heli. In this case, the V912 may be just right!As for using it to prepare for a 450 CP helicopter, well, I donít really that it would help. This is largely because the V912 is far too stable as compared to a CP helicopter.ConclusionWLtoys V912 is stable and fun to fly. Experienced V911 pilots looking for something that flies different or more of a challenge may find this a worthy upgrade. The main gripe I had with the V911 is the twitchy tail (I did not perform the resistor mod), and Iím glad the issue does not exist on V912. This makes banked turns really easy with the V912. If I had not fallen in love with CP helicopters, Iíd be flying my V912 regularly. Outdoor Flight Video:http://www.tmart.com/Wltoys-V912-4-...campaign=rcheli
|01-10-2013 Over year old.|
North Wales, U.K.
Nice write up of the V912 - Just got mine on Tuesday having bought it for a bit of fun.Took it out to the beach today flying over a grassed area, 7 mph wind blowing which was probably slightly too strong but it coped well once switched into "accelerated mode" Low mode did well at lower heights where there was a bit of shelter due to a low sea wall. Once I started going above 10 feet it was out of the sheltered effect of the wall. That is where accelerated mode worked best. I took it up to about 20 feet a couple of times, still hovered nicely but I didn't feel comfortable at that height with a machine of this size & given the wind that was blowing - maybe with calmer conditions and I would be fine with it.You are correct about the slight drift to the left on take off but as stated this is easy to counter with a bit of right stick. Once airbourne the Heli is rock stable and will hover nicely with no hands on the sticks.Quite impressed with this little bird, even had a few onlookers no doubt waiting for me to crash - sadly they were disappointed, I got mine home in one piece and she's now charged up and ready to go again.Might try the slightly larger capacity battery for a longer flight time (1200 mAH instead of the stock 850 mAH)Great little machine though.Mark
I'm only here coz I'm not all there !!
|04-26-2013 Over year old.|
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