Compass Chronos 700 Airframe only CHR-B-700
The Chronos is a helicopter in the 700 size. It is the evolution of 7HV Ultimate and also has some features that are very unique.
The CRS* rotor head is a completely new design. The hardness of the head damping is infinitely adjustable. This allows the Chronos to get optimized to all the different flybarless system and on each flying style. In addition to the hardness adjustment, the new CRS rotor head eliminates a big part of angular errors with a new geometry. Tracking errors at high cyclic deflections are reduced and the helicopter gains precision. Exactly parallel linkages between the swash plate and blade holder and angled linkages between the servos and the swash plate are responsible for this.
The Chronos is using the same in flight indestructible maingear made from DELRIN. With 127 teeth, it is executed in module 1 and cnc-milled. It ensures a quiet running and an effective load transfer.
The frame is easy to maintain, has bushings and mounting points for the cable and is designed in two parts. This makes it very cost effective for a possible crash and easy to fix.
The automatic belt tensioner, and the perfect working tail rotor of the 7HV Ultimate is used in the Chronos as well.
A hollow-drilled 14mm main rotor shaft and a 10mm spindle make the Chronos incredibly stiff and again giving a noticeable gain in precision.
The CF landing gear saves weight and offers a geat optics. Of course, the plastic struts can still be used.
The Chronos is perfectly adapted for all circumstances. Whether hardcore 3D or soft low head speed cruising.
*CRS (Compass-Rotorhead-System) High precision rotor head geometry
Height: 410 mm
Width: 213 mm (170 mm)
Lenght: 1334 mm
Gear Ratio (13T): 9.77 : 1 : 4.8
Take Off Weight with Battery: 4800 - 5800 g
Motor specs: brusless outrunner - shaft lenght 34mm (33 is possible too) and 400 to 600KV
Rotor Blades: 685 - 710 mm
Rotor Diameter: 1570 mm (with 700 mm rotor blades)
Battery Capacity (12S): 4500 - 6000 mAh *
Battery Capacity (14S: 4000 - 5000 mAh *
C-Rate: 25 - 60C
Maximum Headspeed: 2200 RPM **
Maximum Collectiv Pitch: +/- 13° ***
Electronic Speed Controller: min. 120A HV ****
Teeths (Maingear): 127
Drill Size Motor Pinion: 6 mm
* = The weight of the battery should be about 1350 - 2000g!
**** = Minimum continous current is 120A. We recommend to use a 120-200A ESC!
To ground the helicopter, you can use a piece of fine sandpaper to remove a little bit of the black anodizing between the two tail boom clamps in the frame with care. Do not modify the tailboom at the rear tail boom clamp or even behind that! Use a piece of silicon wire with a diameter of at least 1mm˛ and skin one end. Attach the open end to the tail boom with one or two zip ties. Lay the wire to the motor mount, skin the other end and attach the wire to one bolt of the motor mount by jamming the open end under the bolt.