Bootstrap Framework 3.3.6

4.2. CLASS F2B - AEROBATIC MODEL AIRCRAFT
4.2.1. Definition of an Aerobatic Model Aircraft
Powered control line aerobatic model aircraft as per Sporting Code Volume ABR, paragraph 1.3.2 ,
in which all aerodynamic surfaces remain fixed during flight (except for the propeller plus that/those
surface/s used to control the flight path).
4.2.2. Characteristics of an Aerobatic Model Aircraft
a) Maximum total flying weight (excluding fuel) ... 3.5 kg
b) Maximum wingspan (overall)........................... 2.0 m
c) Maximum length (overall) ................................ 2.0 m
d) Permitted power sources shall include any power except rocket motors. Piston engine/s shall be
subject to a total swept volume limitation of 15 cm3. Electric power shall be limited to a maximum
no-load voltage of 42 volts. Gas turbine engines shall be limited to 10 N static thrust.
i A suitable silencer must be used on all piston engines.
ii The noise limit set out at paragraph 4.2.6 c) shall apply to all power sources.
e) Wireless remote control (electrical, optical, or any other) of any control function of, and/or of any
system in the model aircraft shall not be permitted.
f) The following exceptions to rule 1.3.2 of Section 4C of Volume ABR are allowed.
i Other controls may include, but are not limited to: landing gear operation and built-in engine
starters. Such functions may be controlled by the pilot only via line/lines, or may function
completely automatically. The frequency of any electromagnetic pulses transmitted through
wires/cables to the model aircraft shall not exceed 30 kHz.
ii For piston engines (including "Wankel" rotary types), no outside control of the engine/s in-flight
power output shall be permitted whether or not such control is direct to the engine/s or via
propeller/s with variable pitch. For the purposes of this paragraph, the term "in-flight" shall
mean the time between the release of the model aircraft for the Take-off Manoeuvre and the
end of the Landing Manoeuvre. Active or dynamic automatic power output control based on
flight parameters such as, but not limited to, shall also not be permitted: model aircraft speed;
angular speed; centrifugal force; line pull; flying height; or any combination or derivation
thereof. However, if not used for the purpose of active power and/or throttle control, the
following shall be permitted:
a Passive or static devices controlling rate of fuel flow or fuel pressure (for example "uniflow"
fuel tanks).
b Passive or static exhaust systems (for example tuned-length exhaust pipes to control
engine rpm).
SC4_Vol_F2_ControlLine_08 Effective 1st January 2008 Page 12
c Provided they are used only to end a flight, the use of engine/s shut-off systems, either
operated by the pilot or functioning fully automatically, shall be permitted, subject to the
restriction at paragraph e) above.
g) For power sources other than piston engines, engine power controlling systems, whether pilotoperated
or automatic, shall be permitted.

1.3.2 Category F2 - Control Line Circular Flight
This is a flight during which the model aircraft is manoeuvred by control surfaces in attitude and altitude
by the pilot on the ground by means of one or more inextensible wires or cables directly connected to the
model aircraft. Devices in which the control wires or cables are held in the hand or connected to a central
pivot may be used. No other means of controlling the model or the engine may be employed during the
takeoff and flight except that exercised by the pilot through the line or lines.