- OBJECTIVE:
To provide a racing event that may easily be flown "three up" and which
employs relatively inexpensive and easily constructed control line
racing models. To encourage and promote the success" of the "average"
control line flyer in control line racing competition.
- GENERAL:
- Applicability: All rules from the Unified Control Line Racing Rules
apply to this event except as modified, appended or specified here.
- Maintenance: It is imperative that the performance level of this
event be maintained such that it is always possible to safely race "three
up" on stranded lines. If at any time it is felt that the event must
be changed from the three up format for safety concerns or that solid
lines are required, then the event rules should be immediately modified
so as to reduce the aircraft performance level. It is recommended that
this event be reviewed by the National Control Line Racing Association
on a yearly basis. As a guideline, if nominal speeds surpass 105 MPH
(17.14sec/7 laps), then the allowable venturi (part 4.7.1) should be
reduced by 0.010". The sport of three up control line racing should
be preserved at all costs even if individual equipment is temporarily
obsolete.
- MODEL SPECIFICATIONS:
- Models will be of profile construction only. Refer to profile
definition in Control Line General section. The use of cast pan or metal
engine crutch is not allowed. A mounting plate of metal or other material
of no more than 1/8" thickness may be used between the lugs of the engine
and the motor mounts.
- The control system, consisting of leadouts, bellcrank, pushrod and
control horn will be totally exposed and external to normal airplane
contours. The leadout wires will not be recessed into the wing, the
pushrod will not be mounted inside the fuselage, nor will the bellcrank
be allowed to be mounted inside the fuselage. The leadout tip guides
may be inset into the wing but should not be more than 1/2 inch in length.
- The line connections to the model will be external to the aircraft
wing tip.
- The fuel tank must be outboard of the face of the motor mounts where
the engine is bolted, excluding any mounting plate as described in 3(a).
- Pressure fuel systems are not allowed, with the exception that the
fuel tank vent tubes may be directed into the airstream.
- ENGINE SPECIFICATIONS:
- Maximum total displacement shall be 0.4028 cubic inches
(6.6cc). Engines must be production units assembled from factory
available production parts. Engines and parts must have been produced
in quantities greater than 500 and all must be or have been available
through normal retail outlets in the USA. Parts substitution shall be
limited to catalog listed parts produced in quantities greater that 500
units for the engine being altered and available commercially to anyone
from the manufacturer of the engine. Engines may only be modified by
removing parts or material from parts except as noted in the following
paragraphs. No material or part may be added except as noted in the
following paragraphs under this section.
- The "engine" is defined as the complete unit, ready to run, needing
only prop, fuel and starting voltage except that the glow plug, venturi
and/or restrictor, spraybar and needle valve, gaskets, bolts, drive
washer, front washer, prop nut, shims, piston ring(s)(if used) and
ball bearings (if used) need not be considered part of the production
unit. These parts are not subject to the rules regarding quantity or
source. In addition, chrome plating of a production cylinder is allowed.
- The glow plug must have a thread dimension of 1/4-32.
- The engine must be of the front intake configuration. All air
for the combustion process must come through the crankshaft. Altering
nominal sub-port induction, timed holes in the case and sleeve or other
techniques to circumvent the requirement that all air come through the
specified venturi opening are not allowed.
- Only single by-pass port engines are allowed The engine as purchased
and as used shall be of the single by-pass configuration. No schneurle
or PDP porting is allowed.
- No ABC or AAC piston/sleeve configurations are allowed.
- No variable area carburetors shall be allowed. Each engine shall be
equipped with a venturi and spraybar meeting the following restrictions:
- The venturi shall have an inside circular bore of not more than
.292". The venturi will maintain this diameter for at least 0.155"
at the throat of the venturi where the spraybar will be located at the
midpoint of the area.
- The spraybar assembly will be located precisely through the
centerline of the venturi bore and shall have a constant circular cross
section of diameter not less than 0.153" for the portion in the throat
of the venturi.
- No tuned pipes, mufflers or exhaust extensions are allowed.
- The complete engine/venturi/spraybar system shall weigh less than
10.5 ounces.
- FUEL SPECIFICATION:
- The fuel for this event shall be supplied by the contest organizers
and shall contain not more than 10% Nitromethane not less than 20%
lubricant and the rest shall be methanol.
- RACES:
- Each contestant shall be allowed at least two qualifying heat races.
- Qualifying heat races shall be 70 lap races with one required pit
stop. It is suggested that only the best time of the two qualifying
attempts be used as the basis for advancement to the finals.
- Finals race shall be 140 lap races with three mandatory pit refueling
stops.
- All races shall be run with no less two or more than three flyers,
races should be flown three up.
- LINES:
- Shall be minimum of two .018 diameter multi-strand only, and length
shall be 60 feet plus or minus 6" as measured from center line of handle
to center line of fuselage.
- Pull test 35 Lbs.
- FLYING REGULATIONS:
- All flying shall be done between 6 and 20 feet altitude.
- SPECIALTY ITEMS:
- Shutoffs: allowed; fuel shutoffs are recommended for safety.
- Hot gloves: allowed
- Prop: open
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