Tech Stuff & Reviews

Review: KingKong 90GT Micro Racing Quad

Mike vom Mars Blog betaflight pids buzzer kingkong kingkong 90gt kingkong 90gt mods kingkong props led strip matek model finder micro fpv micro racer micro racing quad review test
 
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Multicopters are becoming smaller and smaller. Micros and Minis are now the trend: they offer a lot of advantages compared to big copters: they are cheaper to buy, spare parts are more effordable, crashes cause less damage, they are perfect to fly because of their low mass and due to their low weight, they do not fall under too restrictive laws. The KingKong 90GT is the insider tip among the micro racers.

KingKong 90GT Micro Racing Quad

KingKong 90GT Micro FPV Racer

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KingKong 90GT

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KingKong 90GT

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KingKong 90GT Box

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Racerstar Props

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Racerstar Props

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LED Strip

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Racerstar Props

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Matek Model Finder / Buzzer

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3D Printed Lipo Mount

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Highlights
1103 7800KV Brushless Motors
600 TVL 16 Channel 25mW FPV Camera
3A BLHELI_S ESCs (Multishot / Dshot300 / Dshot600)
Screwed 1935 48.26mm 3 Blade Propellers
With FrSky, DSM2 or FASST Receiver
2S Powered
Weight: ~49g
Flight Time: 6-7 mins.
Micro F3 6DOF Flight Controller (32-Bit)
Comes with a nice transportation box
BetaFlight pre-flashed
Useful Links
KingKong 90GT at Banggood
KingKong 90GT Spare Props
Racerstar 1935 5-Blade Props
LED Strip
2S 850mAh Lipos at Hobbyking
Lipo Tray for Hobbyking 2S Lipos (Thingiverse)
1000TVL Micro FPV Camera

Even while holding the KingKong in your hand, you’ll notice the good and solid materials – a real contrast to the Eachine QX95, which feels more like a cardboard copter: the QX95 frame brakes too easily while the 90GT frame is rather solid. The propellers are screwed and not, as with most Minis, just stuck on the motor pins. So you don’t have to fear any disengaging props on full throttle.

Propellers

The attached 3-blade propellers are slightly translucent and look really stylish. There are 2 sets (eight pieces) included. The KingKong Props are available in many colors: purple, red, orange, white, blue, etc. They are screwed onto the motor with two screws each and are quite efficient, but they break easily because they are relatively rigid. A good alternative are the 1935 Racerstar 5-blade propellers.

FPV Camera

The 600 TVL camera performs mediocre in sunlight and provides a very useful image. However, as with most cheap FPV cams, light / dark changes and cloudy skies are not handled very well. Actually, the mediocre cam it is the only real con with the KingKong we found so far. The space on the King Kong is quite limited by the propellers so it’s hard to find an alternative mini FPV Cam that fits there. However, a very good replacement for the KingKong Cam is the 1000TVL from Banggood, which performs great for only 10 EUR and is dimensioned only 8x8mm. So it should fit well on the Kong.

The FOV (field-of-view) of the KingKong Cam should be ~120 degrees, which is better than on many other racers.

As with most micro racers, the camera is installed straight forward. If you prefer to fly indoors, you can leave it that way. However, if you like to have fun with Acro mode or high-speed-flying, a steeper camera angle of 30-40 degrees or more is recommended. This can be done here quite easily and without extra camera mount (read more under “Modding”). With a camera angle of 30 degrees or more, the KingKong really starts up and offers a great speed!

The video transmitter offers 16 channels, four channels on each frequency band. Changing the transmitting video channel is quite easy: just press the small button on the video transmitter. A colored LED flashes in different colors, where each color code (f.e. green-blue) represents a certain frequency. There is a color code table included in the KingKong’s manual that refers to the color codes and video channel representations.

Receiver

We ordered the 90GT with DSM2 receiver. This could be bound within seconds and worked without any problems with my Devo 10, when set to Spectrum1024 in BetaFlight. The receiver has two antennas to improve the reception quality. The receiver offers seven channels when connected via DSM2. If you connect the receiver with DSMX (then Spektrum2048 should be used in BetaFlight) you have eight channels, but we had serious hickups and brown-outs during flights with DSMX, so you should prefer DSM2 protocol.

Flying Characteristics

The flying characteristics of the 90GT are excellent – even with the default standard PIDs. We only had to set the D-values ??a little higher, nothing else. The KingKong nearly flies like on rails, although it is very agile. Even in stabilized mode, he is still very fast and agile. Flips and Rolls can be flown perfectly. Thanks to the low weight, the KingKong has a brilliant hang time: if you take the throttle away at high altitude, it almost looks as if it were weightless in the air. Of course, the Kong’s power cannot be compared with the punch (traction) of big 4S racers. Therefore, you’ll have to push the throttle stick earlier in acrobatic maneuvers.

After an update to BetaFlight 3.1.6, we set the KingKong to DShot150 and use the following PIDs – this way it flies absolutely brilliant and can be controlled very fast and accurately:

PIDRC RateSuper RateRC Expo
Roll6040351.200.750.10
Pitch7050351.200.750.10
Yaw70451.200.700.00

Before the first flight

All in all, the 90GT is immediately ready for use after binding. However, you should take the time and adjust some settings in BetaFlight. Here, as always, you should pay attention that the stick end points of the control channels are nicely tared (minimum at 1000, middle at 1500, maximum at 2000). A guide is available here.

There is no low voltage alarm or buzzer pre-installed, so you should not fly too far and keep track of your flight times. Use the timer on your TX to be alerted.

As with many FPV quads, it may happen that the camera is not focussed correctly. To correct that, gently turn the lense until it breaks free from the little glue that is used to hold it. Then turn it clockwise or counter-clockwise until you receive the sharpest picture in your video goggles. Use a drop of power glue then to fasten it again.

If you unscrew the propeller protection (screwed to the bottom of the engines), use only two screws (instead of four) per engine and use the long screws (included). Then use the washers (also included) to avoid damage to the motors. If the prop guards are not used, the short screws must be screwed into the motors. Without Prop Guard, do not use the long ones! This would damage the motors!

Conclusion

Goal! After some disappointments with Eachine and others, we finally found a full-fledged, mini racer who does not feel like a cardboard toy. The KingKong 90GT makes a very valuable impression, is fast and brings plenty of fun! The original Props are very fragile, so you should go for the Racerstar Props. The stylish transportation box of the KingKong is a highlight and the included 9-pin connector, which allows the connection of a LED bar comes very handy.

Unfortunately there is no buzzer pre-installed, so one of the first things to do is to install a custom buzzer (model finder), otherwise you’ll lose the Kong on the first day. Installation of a LED strip is also useful to find the quad in higher grass and increase it’s mid-air visibility. The Eachine QX95 LED strip fits perfectly here.

Next page: Pimp my Kong – Better props and how to install an LED strip on the KingKong 90GT!

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Editor rating: 4.5 / 5




Recent Comments

  1. Very good writeup on the 90gt. Any more tips.on tuning will be appreciated.

  2. This is great, very nice writeup – don't suppose you've added OSD to your 90GT? I'd love to see a similar writeup for that with wiring diagrams etc.

  3. Mike-vom-Mars

    I did not add an OSD yet since I don't see any reason to do so. The only useful information would be the battery voltage, but I set up a timer on my TX that alerts me in time. If there are other advantages of adding an OSD, let me know and I'll probably give it a try :-)

  4. Hi Mike, how did you *hide* the dsm receiver in this KingKong without using your designed lipo tray?

  5. Mike-vom-Mars

    Bob, I added three more pictures to the slide show above that show how I added the receiver. See the last three images. Watch the green / yellow / black cable, they go to the receiver. I placed it on top using some hot glue. You have to tilt the receiver 90 degrees the side and place it between the buzzer and the video transmitter.

  6. Is there a way to adjust the low voltage cutoff my drone drops out when I give full throttle at around 3 half min than it'll fly unless I punch it. 450mah 50c

  7. Mike-vom-Mars

    If the quad powers off or reboots, it may be caused either by a weak (old) Lipo or a weak LDO. The LDO is the part on the flight controller board that supplies constant 5V power. If the LDO can't deliver enough regulated 5V power for the receiver, cam, VTX etc., the board will shut down or reboot. The lag of power supply could be solved by adding a 5V BEC (like this one: http://bit.ly/2Dh7I1Z). Its power output is much more stable than the built in power converter (also provides more ampere). The BEC's input is connected directly to the Lipo pads, the output can be used to feed receiver, LEDs, cam, VTX etc.

  8. Please help, I follow your the buzzer instruction that is good but when Arming and flying the buzzer work during flying and stop when disarming.

  9. Mike-vom-Mars

    @Nguyen: probably a too sensitive low voltage setting in Betaflight? Also install the latest Betaflight GUI, it has a section to configure the buzzer in detail (beep conditions). Also check your RC channels in Betaflight to ensure that the arm switch does not activate the buzzer.

  10. should I connect to +b or -b ?

    one set of instructions showed -b, but you seem to show +b

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