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SK 720 Flybarless System

SK-720 Flybarless System

$399.95 USD (Does not include the Power Bus or Dataviewer Pro)

(now in stock at HeliDirect, A Main Hobbies and Grand RC)

SK-720 Digital Flybar

The SK-720 replaces the tail gyro, mechanical flybar, and receiver on your R/C Helicopter. Other features include flight logging with playback, optional-self leveling, and more to come!

This unit is ideal for pilots from beginner to 3D expert. Go flybarless!

Now with Software Rev 3.0, the SK720 has a governor and vibration analyzer!!

Overview

The SK-720 can greatly simplify your heli’s setup, by eliminating the flybar mechanics, tail gyro, and with the use of satellite receivers (not included), the receiver core and associated wiring as well.

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?

Power Bus

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 includes a 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 first flybarless 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

  • Easy set up for first-time users
  • Flybarless stabilization with piro-compensation
  • Built-in tail gyro, supporting most all tail servos by name in the setup software
  • Supports many input options: Spektrum/JR Satellites (DSM2 and DSMx), Futaba S-Bus, Futaba PPM, Jeti PPM, Graupner JR, and your old traditional receiver.
  • Supports use as a 9-channel receiver core when used with Spektrum Satellites, Futaba S-Bus, or PPM receivers
  • Free vibration-analysis software lets you find mechanical problems with your heli.
  • 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.
  • Works with Digital or Analog swash servos
  • Suitable for 120, 135/140, and 90 degree eCCPM, as well as mCCPM swashplates
  • Works with 2,3,4, or 5 blades, with phase trim adjustable to +-90°
  • Swash Ring anti-binding algorithm
  • Internal swash mixing, for accurate control
  • Supports spektrum radios with either 1024 or 2048 servo steps, and 22ms or 11ms frame rates, DSM2 or DSMX
  • Expansion port for future accessories such as GPS
  • 38 x 30 x 14 mm, 17 grams
  • 8.5 volt capable
  • Optional 20 amp external power bus (included) for larger than 50-size and nitro helis (15 grams). Make brownouts a thing of the past!
  • 3-axis accelerometer + 3 gyros, allowing self-leveling
  • High-power 32 bit processor (for future upgradeability)
  • Expansion port for GPS or a third sat-receiver
  • Up to 10 servos (one tail servo, 4 digital swash servos, Throttle, and 4 Aux channels)
  • Port for a remote indicator LED , which you can mount outside of the canopy
  • Data logging of vibration level, RPM, servo bus voltage, control positions, and error states
  • Built in micro-SD card (2 GB flight-data logging)
  • Built in USB mass storage device – Connect the unit to your computer without having to install drivers
  • Flight data logs can be played back on your PC with analysis of tuning and heli health (software compatible with Windows 2000 and newer)
  • Compatible with the Skookum SK-LCD terminal
  • Existing SK360 setup files can be easily up-converted for the new unit

Warning: The SK 720 should not be used in twin-spool turbine powered helis, as the very high frequency noise unique to these turbines can cause sensor errors.  This problem is common to most flybarless systems currently on the market.

SK-720 GUI
SK-720 Playback
SK-720 Data Viewer

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