Mike Hazel's proposal to change the pull test, line diameter and line length for the Northwest Sport Jet Speed event has passed in voting by Northwest control-line fliers concluded April 15, 2007. The new rules take effect immediately.
The proposal specifies new pull test, line diameter and line length.
The proposal was formally introduced earlier this year. There was a month for comment, a period for voting, and now the rules take effect as approved. These rules will be in force for Northwest contests unless otherwise noted by the contest organizers.
In the new rules immediately below, bold-face italics indicate the changes. The old rules are at the bottom, for your reference.
Note that the new rules void existing records in the category. The record of 150.69 mph, held by Dick Salter, is retired and the record is now vacant. Dick's record was set in Salem, Ore., on Aug. 28, 2005.
For more information on how the Northwest rules process works, see the Northwest Rules page.
(Revisions are in bold italics)
All A.M.A. rules from the control line general and control line speed sections shall be applicable, except as follows:
1) AIRFRAME:
1.1 Any design configuration and construction method is permissible so long
as the contest management considers the model to be safe and sound.
1.2 The engine and engine mounts shall receive a 40 pound
pull test.
1.3 The control system must be mounted external to the normal aircraft contours.
This includes the bellcrank, leadouts or control lines, pushrod, and elevator
horn. No more than one inch of the leadouts or control lines can be enclosed
by the leadout guides.
1.4 The maximum weight of the aircraft in ready-to-fly condition, including
fuel shall be 45 ounces.
2) LINES & PULL TEST:
2.1 The model must be flown on two single strand steel control lines of
.020 minimum diameter. The distance between the centerline
of the fuselage and the center of the control handle grip shall be a minimum
of 65 feet.
2.2 The model and entire control system, lines and handle shall receive
a 40 G pull test.
3) ENGINE:
3.1 The allowed jet engines are the Dyna-Jet, Bailey Sport Jet, and the
O.S. II.
3.2 It is required that the engine shall be in stock condition internally.
No material may be removed or added to the engine, except as follows:
a. Engine head: Part or all of the head fins may be removed. Holes may be
drilled into the head for purposes of engine mounting. Valve face may be
lapped as needed for routine maintenance. Engine cowling is permitted, but
the front of the cowl must be behind the intake throat.
b. Flowjector: Fuel feed holes may be drilled out to larger size, or filled
and redrilled. (holes allowed in original location only). A short piece
of metal tubing may be installed into the tire pump connection to facilitate
quick removal of the air supply hose. Alternatively, the threads on the
tire pump connection may be filed off, or filled in so as to make a smooth
surface to facilitate quick removal of the air supply hose.
c. Metering jet: Any metering jet may be used, and may be located anywhere
between the tank and the flowjector.
d. Tailpipe: A stock tailpipe with ignition plug in place must be used.
(starting ignition may be by means of a starting probe). Repaired tailpipes
are permissible, provided stock dimensions have been faithfully adhered
to. The front surface of the tailpipe (combustion chamber screw ring) and
the lock ring may be lapped.
e. Reed valve: Any commercially available valve may be used.
3.3 Interchanging of parts between the above listed engines is permissible.
3.4 Fuel delivery to the engine shall be by suction, no pressure feed is
allowed.
4) FUEL:
4.1 Fuel used shall be the A.M.A. formula: 80% methanol & 20% propylene
oxide.
5) OTHER:
5.1 Timing will be for 6 laps. Speed calculation is: V = 1670.76 divided
by seconds.
5.2 All other general rules for control line speed flying (attempts, number
of models, competition flying from pylon, timing of flights, etc.) shall
be applicable.
5.3 Builder of the model rule is not applicable to this event.
5.4 Entrant of the model shall either be the pilot, or shall start the engine.
mwh/2007/FL2.07proposal
OLD
NORTHWEST SPORT JET SPEED
EXISTING RULES
All A.M.A. rules from the control line general and control line speed
sections shall be applicable, except as follows:
1) AIRFRAME:
1.1 Any design configuration and construction method is permissible so long
as the contest management considers the model to be safe and sound.
1.2 The engine and engine mounts shall receive a 35 pound
pull test.
1.3 The control system must be mounted external to the normal aircraft contours.
This includes the bellcrank, leadouts or control lines, pushrod, and elevator
horn. No more than one inch of the leadouts or control lines can be enclosed
by the leadout guides.
1.4 The maximum weight of the aircraft in ready-to-fly condition, including
fuel shall be 40 ounces.
2) LINES & PULL TEST:
2.1 The model must be flown on two single strand steel control lines of
.018 minimum diameter. The distance between the centerline of the fuselage
and the center of the control handle grip shall be a minimum of 70
feet.
2.2 The model and entire control system, lines and handle shall receive
a 75 pound pull test.
3) ENGINE:
3.1 The allowed jet engines are the Dyna-Jet, Bailey Sport Jet, and the
O.S. II.
3.2 It is required that the engine shall be in stock condition internally.
No material may be removed or added to the engine, except as follows:
a. Engine head: Part or all of the head fins may be removed. Holes may be
drilled into the head for purposes of engine mounting. Valve face may be
lapped as needed for routine maintenance. Engine cowling is permitted, but
the front of the cowl must be behind the intake throat.
b. Flowjector: Fuel feed holes may be drilled out to larger size, or filled
and redrilled. (holes allowed in original location only). A short piece
of metal tubing may be installed into the tire pump connection to facilitate
quick removal of the air supply hose. Alternatively, the threads on the
tire pump connection may be filed off, or filled in so as to make a smooth
surface to facilitate quick removal of the air supply hose.
c. Metering jet: Any metering jet may be used, and may be located anywhere
between the tank and the flowjector.
d. Tailpipe: A stock tailpipe with ignition plug in place must be used.
(starting ignition may be by means of a starting probe). Repaired tailpipes
are permissible, provided stock dimensions have been faithfully adhered
to. The front surface of the tailpipe (combustion chamber screw ring) and
the lock ring may be lapped.
e. Reed valve: Any commercially available valve may be used.
3.3 Interchanging of parts between the above listed engines is permissible.
3.4 Fuel delivery to the engine shall be by suction, no pressure feed is allowed.
4) FUEL:
4.1 Fuel used shall be the A.M.A. formula: 80% methanol & 20% propylene
oxide.
5) OTHER:
5.1 Timing will be for 1/2 mile ( 6 laps ).
5.2 All other general rules for control line speed flying (attempts, number
of models, competition flying from pylon, timing of flights, etc.) shall
be applicable.
5.3 Builder of the model rule is not applicable to this event.
5.4 Entrant of the model shall either be the pilot, or shall start the engine.
mwh/2003/FLballot196
This page was upated April 16, 2007