Line size change approved for 80mph Combat
Northwest Combat fliers have approved a revision of the control line specifications for 80mph Combat in a vote that was counted on Feb. 20, 2019, and takes effect for the 2019 season.
The proposal offered by Gene Pape aligns the Northwest 80mph Combat event with the newly revised rules for AMA Slow Combat, which requires .018" wires for all airplanes.
Rules for Northwest 80mph Combat are based on the AMA (fast) Combat rule, which allows .015" wires for engines up to .15 size and .018" wires for larger engines. The change approved for 2019 removes option of using .015 wires.
Voting in favor of the .018 line size requirement for all airplanes was unanimous. There were no "no" votes cast.
Here are the specifics of the change:
Adds rule No. 4 by adding line specifications, and renumbers succeeding sections.
Approved 2019 80mph Combat rules
New language in red; deleted language in
RULES FOR NORTHWEST 80MPH COMBAT
1. PURPOSE: It is the intent that this event will provide a form
of combat that is slower, more relaxed, and less destructive to equipment
than all-out AMA combat events.
2. All rules for AMA (fast) combat shall apply except as follows:
3. ENGINES: Any engine up to .40 displacement is permitted.
4. LINES shall be of a minimum .018-inch diameter, and lines shall be of the stranded type, with a length of 60 feet measured from the handle grip to the fuselage, plus or minus 6 inches. Spectra (or equivalent) lines will be allowed and must pass pull-test requirements.
5. SPEED LIMIT: The airspeed limit for all contestants shall be
80 mph, which is defined at 6.43 seconds for a two-lap period at 20-foot
height. No devices capable of varying the speed of the airplane in flight,
such as throttles or carburetors adjusted by elevator trim, are allowed.
6. MATCH PROCEDURE: Flying of matches shall be exactly the same
as in AMA combat except as follows:
The first airplane to launch will be timed for two laps after the first
full lap, at a height of approximately 20 feet (brief deviations in height
for safety reasons are permitted). If the time for those two laps is greater
than 6.43 seconds, the airplane will be judged eligible to compete. Pilots
must keep the plane near the 20-foot height; failure to do so will delay
If the second airplane launched appears to the circle marshal to be slower
than the first plane, after the first plane has been declared eligible,
the circle marshal may waive the timing of the second plane and signal the
start of combat. If the second plane appears equal to or faster than the
first plane, the circle marshal may time the second plane as well before
In the case of a simultaneous launch, the faster airplane will be timed.
Airplanes will not be timed on successive launches in the same match, unless
the circle marshal has reason to believe that a plane has passed the 80mph
speed limit. The circle marshal retains the right to stop combat at any
point and re-time any airplane that appears to have passed the 80mph speed
Exceeding the speed limit:
If, on the initial launch, a plane is judged to be flying in excess
of the 80mph speed limit, that plane's airtime watch will be cleared, and
airtime will not be counted until the plane is judged to be consistently
flying below the airspeed limit; combat will not be started until both airplanes
are within the speed limit. If a plane is judged to exceed the limit at
sometime during the match - after the initial timing - the airtime watch
will be stopped and not restarted until the plane is judged to be consistently
flying below the speed limit; combat will be stopped until both planes are
below the speed limit.
7. SCORING: Per AMA Combat.
For a complete copy of the Northwest 80mph Combat rules (without the annotations above), and for an explanation of how the Northwest control-line rules process works, see the Northwest Rules section.
This page was upated Feb. 24, 2019