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Overview
The SK-720 is one of the most advanced and full-featured flybarless controllers available today. It’s a professional grade flight controller, ready for beginners and professionals alike.
But more than just a flybarless system, the SK-720 is a complete 6-degree of freedom inertial flight control system. So what does that mean for you?
Fast Performance
For 3D pilots, the SK-720 integrates the yaw and cyclic gyros, giving rock-solid piro maneuvers and tail control that benefit from knowing what the collective stick is doing. Flybarless flight gives you more power with less bogging, and a locked-in control feel that is far superior to traditional flybar flight.
Improved Stability
For beginners or those learning 3D, the SK-720’s built-in 3-axis accelerometer means you can set it to self-level, like a coaxial heli. This feature can be turned on full time, dialed down as your skills improve, or set to bail you out at the flick of a switch. Plus, a flybarless heli has greater stability than a heli with a flybar, and with fewer parts, is easier to repair. Small 450 size helis become as stable as 90-size helis. The SK-720 will allow every new pilot’s first R/C helicopter to be flybarless.
Flight Logging
For all pilots, the SK720’s built-in flight logging and data-plotting tools let you record and play back your flights in a simulator-like display on your PC (like a black-box recorder). Both the heli’s motion and the stick positions are displayed, letting you learn exactly where you can improve your skills – or why you crashed. The playback software can also be used as a diagnostic tool, warning you of voltage dropouts and high vibration, while marking where in the flight they occurred. The data plotting software’s free version lets you analyze your heli’s vibration spectrum to find the source of mechanical issues, and with a low-cost upgrade, you can also plot and print reports for all the critical health log data for your heli and its radio system.
Helis Big & Small
For pilots flying micro-helis, the SK-720 will greatly simplify and lighten your machine. It also has a special small-heli tail gyro mode to give good holding power even on 250-size helis.
If you fly larger helis, the SK-720 can be used with an optional heavy-duty external power bus that’s good for 25 continuous amps, and helps to isolate vibration from the gyro itself. The bus allows for high voltage servos, low voltage servos, or a combination of both, and includes 16 gauge cabling to connect directly to a 2-cell lipo battery.
Easy Setup
The PC setup software has wizards to guide you through setting up your heli in just minutes – making it easier to set up an SK-720 machine than a heli with a traditional flybar!
The setup software or optional SK-LCD terminal lets more advanced users fully tune their heli for max performance. And it’s easy to upgrade the firmware at home so you’ll benefit from any future product improvements with just a click of your mouse.
Future upgrades will include a GPS accessory for more precise xyz positions in the flight logs, as well as abilities entirely new to the hobby.
Features
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Pinpoint gyro sensors
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Anodized CNC case
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Upgraded accelerometers
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All high-speed capable servo bus outputs
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Native SBus in and out on the servo bus
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I2C serial capable for multicopter control
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More capable SD card bus
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Easy set up for first-time users
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Supports many input options: Spektrum/JR remote (satellite) receivers (DSM2 and DSMX), Futaba S-Bus, JR DMSS, Futaba PPM, Jeti PPM, Graupner JR, and traditional receivers.
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Supports use as a 9-channel receiver core when used with Spektrum remote (satellite), Futaba S-Bus, JR DMSS or PPM receivers
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Compatible with the SK-GPS module, adding position and alititude hold, a multi-mode rescue system and return to home functionality.
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Free vibration-analysis software lets you find mechanical problems with your heli.
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Low-cost Data Plotter software upgrade lets you plot and print reports for all the critical health log data for your heli and its radio system.
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Works with Digital or Analog swash servos
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Suitable for 120, 135/140, and 90 degree eCCPM, as well as mCCPM swashplates
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Works with 2,3,4, or 5 blades, with phase trim adjustable to +-90°
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Swash Ring anti-binding algorithm
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Internal swash mixing, for accurate control
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38 x 30 x 14 mm, 24 grams
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8.5 volt capable
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3-axis accelerometer + 3 gyros, allowing self-leveling
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High-power 32 bit processor (for future upgradeability)
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Up to 10 servos (one tail servo, 4 digital swash servos, Throttle, and 4 Aux channels)
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Port for a remote indicator LED , which you can mount outside of the canopy
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Data logging of vibration level, RPM, servo bus voltage, control positions, and error states
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Built in micro-SD card (2 GB flight-data logging)
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Built in USB mass storage device – Connect the unit to your computer without having to install drivers
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Flight data logs can be played back on your PC with analysis of tuning and heli health (software compatible with Windows 2000 and newer)
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Compatible with the Skookum SK-LCD terminal
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Existing Skookum Robotics flybarless system setup files can be easily up-converted for the new unit
SK-GPS
NOTE: the features listed on this page reflect those that will be available with the release-date firmware. Additional features will be added in the future along with software and interface upgrades.
The SK-GPS’ user manual is available for download here.
In a single unit (58mm x 32mm x 13mm), the SK-GPS combines altitude and position hold, and a “flight floor and ceiling” that works in both single rotor and multirotor helis, and even inverted! Just like the SK-720 it’s paired to, the SK-GPS is ideal for any and all RC helicopter pilots, from absolute beginners to hardcore 3D pilots to commercial aerial photographers and videographers.
The SK-GPS sets itself apart from its competition through its versatility. It can be flown slow and smoothly, or at full smack 3D, even holding altitude and position inverted when you need it to. It can be flown on essentially any-sized collective pitch heli or quadcopter. All of this can be flown using the SK-720 and the single module, with no costly upgrades or excessive wiring with multiple modules. What’s more, the SK-GPS adds another level to the Sk-720′s flight logging capabilities – pilots can now plot recorded flights to Google Earth!
The bailout function features two modes – pilots can set the SK-GPS to bail their heli out when it reaches a set altitude, or to bail out before the set altitude. The SK-GPS also bails the heli out with the tail pointed towards the pilot to help with orientation after recovery.
The SK-GPS will also “return to home” when needed, while adding an extra level of safefy by hovering 10 metres (33 feet) above the set point, allowing the pilot to safely land the heli without risk to bystanders.
Using the SK-GPS is easy, and uses only one channel from your receiver – all you need is a transmitter with a 2 or 3 position switch and a free channel. Each position you can have manual flight, altitude hold only, and full position hold.
The SK-GPS connects directly to any existing SK-720 via the included single 4-pin cable. The SK-GPS also features a second 4-pin port for additional accessories, such as the upcoming CVT module and other future Skookum accessory modules.
Skookum SK-LCD Field Terminal
The SK-LCD Field Terminal allows you to set up your SK-720 or SK-360 Flybarless System at the field, without a laptop computer. It will give you access to all the functions of the PC-based GUI, except upgrading the Flybarless System's firmware.
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