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RocHobby Critical Mass High Speed 1100mm (43") - PNP

Brand: RocHobby /
Regular price $ 199.99

RocHobby Critical Mass High Speed 4S - Receiver Ready - ROC012-1

We felt the Critical Mass was deserving of a high speed power plant to give it the performance many are looking for. The Critical Mass was already one of the favorite planes around Motion RC but now it is even better. We added a larger 3648-770Kv motor, 70A ESC, and 9g metal gear servos. In addition the plane now runs on a 4 cell LiPo. The Critical Mass can now reach speeds of 90Mph and has unlimited vertical. The critical Mass still retains the amazing flight characteristics it has become known for. Landings are still slow and very predictable. It is a true joy to fly. Don't forget about the great features that made this plane popular in the first place. It still has split flaps, servoless electric retracts, and fantastic good looks.

Unlike many stock planes, this one is not underpowered at all. In fact, this plane may be too fast for some. We will retain the normal speed Critical Mass as a product since not everyone needs extreme speeds. The high speed Critical Mass will absolutely leave leave lesser planes in the dust. The high speed version has the same strong EPO foam construction and retains the nylon hinges for the split flaps. The retracts have proven very durable on the original Critical Mass so the same retracts with metal trunnions have been used again. The same upgraded problem free paint has been used to match the later versions of the regular speed Critical Mass. We at Motion RC think this is one of the most durable, most fun, best built planes on the market. Like all RocHobby planes, this one is made by FMS.


  • Able to achieve speeds of 90mph
  • 3648-770Kv motor and 70A ESC
  • Now uses a 4S 2200 LiPo
  • 9g metal gear servos for ailerons, rudder, elevator
  • Split flaps with nylon hinges
  • Servoless electric retracts with metal trunnions
  • EPO foam construction
  • Brushless motor, ESC and servos installed


  • Minimum 6 Channel Radio - Click Here for recommendations
  • 6 Channel Receiver - Click Here for recommendations
  • 4 Cell 14.8V 2500 mAh Lipo Battery - EPR25004PRO
  • Lipo Battery Charger - Click Here for recommendations

Product Specifications:

AGE LEVEL : 14 and up
SKILL LEVEL : Advanced
BUILD TIME : 1+ Hours


1100mm / 43.3in


918mm / 36.1in

Flying Weight


Power System

3648-770Kv brushless

Speed Control

70A, Integrated 5A SBEC, T Connector

Propeller / EDF

4 blade prop


9g×4 metal gear, 9gx2 standard (flap)

Landing Gear

Servoless electric retracts, metal trunnions

Required Battery

14.8V 2200mAh 30C 4 cell LiPo

Required Radio

6 Channel




Yes - split flaps





Hinge Type



EPO Foam

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