Proposal would remove Vintage Diesel Combat engine restrictions

Discussion period open; voting to follow

Ken Burdick has proposed a change to the Northwest's Vintage Diesel Combat rules that would allow more engines to be used in the event. The proposal removes restrictions on the engines except for the requirement that it be a diesel of .15 cubic inch displacement, but retains the 64 mph speed limit.

Summary of proposal

Current language:
1.1. Engine: Any production .15 c.i.d. maximum diesel having a single or dual ballrace or plain bearing, non-Schneurle, iron piston/steel cylinder.

Proposed language:
1.1. Engine: Any production .15 c.i.d. maximum diesel.

Rationale, as explained by Ken Burdick:

By allowing ABC and Schneurle porting, but maintaining the same speed limit, allows new engines that can reach the max speed without the issues many engines have. 

Discussion period

A thread for discussion of this topic is active on the Northwest CL Forum. See what others have been saying and post your comments about the proposal there.

After a month of discussion, voting will be opened under the usual rules procedure described in the Northwest Rules section.

Effective date

Approved changes, if any, will take effect after the conclusion of voting and the announcement of results.

Proposal details

A copy of the proposed new rules and a copy of the current rules are below.


Proposed rule

RULES FOR VINTAGE DIESEL COMBAT

Proposed new language in red, deleted language in strikethrough.

1.1. Engine: Any production .15 c.i.d. maximum diesel having a single or dual ballrace or plain bearing, non-Schneurle, iron piston/steel cylinder.
1.2 Only suction fuel systems are permitted.
1.3 Any propeller may be used which meets AMA safety specifications.

2.1 Aircraft: A nostalgia combat model must be a design which was in common use or kitted prior to December 31, 1970. It must have been designed for a .15 cu in engine.
2.2 Models must be an accurate plan view of the original. The following alterations are permitted:

  • Addition to or omission of sheeted areas. Omission of vertical fins.
  • Changes to airfoil or internal structure. Additional booms or substitution of wire for wood, or vice-versa.
  • Recessing engine into leading edge.
  • An upright engine mount may be changed to side mount.
  • A balanced elevator may be changed to a conventional, and vice-versa. The elevator must retain the original outline.

All the major parts of the airplane must be built primarily of wood but may be reinforced, with fiberglass, carbon fiber, boron or Kevlar to increase durability. Major parts may include the leading edge, trailing edge, ribs, wingtips, spars, elevator and motor mounts.

2.3 The following alterations are not permitted:

  • Foam construction may not be used. Exterior controls may not be used.
  • Any changes to the original plan view except those outlined in 2.2 are not permitted.

The CD may decide to not accept a model which has been altered from the original design outline.

3.1 Pull test: 25 lb.

4.1 Lines shall be a minimum .015" diameter, stranded type, with a length of 52'-3" measured from the handle grip to the fuselage, plus or minus 3 inches.

5.1 Speed limit: 64 mph = 7.0 seconds/2 laps towing a streamer.

6.1 Number of models. One model per match. 3 models maximum per contest.

7.1 Pit crew. Two pit crew are allowed per contestant. A contestant may start his own engine.

8.1 Officials: A contest shall be run by a circle marshal who shall be the overall timekeeper, plus one scorer per contestant.

9.1 The match: One minute for engine starting and launching. The 5-minute match clock is started as the second plane launches or at the end of the one minute, whichever comes first. The match lasts 5 minutes.

Engines must be started by hand.

9.2 Scoring: One point is deducted for each second a contestant's plane is on the ground during the 5 minute match. 50 points are awarded for each cut of their opponent's streamer or string with knot. There are no kills.
The match shall continue after a mid-air collision or line break. Lines may not be changed during a match.

10.1 Contest Procedure: Each contestant shall compete in 5 rounds. 2 points for a win, 1 point for a tie, 0 for a loss. The top 4 flyers will than compete in 2 semifinals and a final to determine the winner.

10.2 Combat Site: A 3-foot radius pilots' circle and a concentric 65 foot radius safety circle.

ml/jt/FLballot#199//revise/dm/ballot/1-1-09//revise/gh/ballot/1-1-10//revise/kb/bw/ballot/4-17-10//proposal/kb/3-21


Existing rules

RULES FOR VINTAGE DIESEL COMBAT

1.1. Engine: Any production .15 c.i.d. maximum diesel having a single or dual ballrace or plain bearing, non-Schneurle, iron piston/steel cylinder.
1.2 Only suction fuel systems are permitted.
1.3 Any propeller may be used which meets AMA safety specifications.

2.1 Aircraft: A nostalgia combat model must be a design which was in common use or kitted prior to December 31, 1970. It must have been designed for a .15 cu in engine.
2.2 Models must be an accurate plan view of the original. The following alterations are permitted:

  • Addition to or omission of sheeted areas. Omission of vertical fins.
  • Changes to airfoil or internal structure. Additional booms or substitution of wire for wood, or vice-versa.
  • Recessing engine into leading edge.
  • An upright engine mount may be changed to side mount.
  • A balanced elevator may be changed to a conventional, and vice-versa. The elevator must retain the original outline.

All the major parts of the airplane must be built primarily of wood but may be reinforced, with fiberglass, carbon fiber, boron or Kevlar to increase durability. Major parts may include the leading edge, trailing edge, ribs, wingtips, spars, elevator and motor mounts.

2.3 The following alterations are not permitted:

  • Foam construction may not be used. Exterior controls may not be used.
  • Any changes to the original plan view except those outlined in 2.2 are not permitted.

The CD may decide to not accept a model which has been altered from the original design outline.

3.1 Pull test: 25 lb.

4.1 Lines shall be a minimum .015" diameter, stranded type, with a length of 52'-3" measured from the handle grip to the fuselage, plus or minus 3 inches.

5.1 Speed limit: 64 mph = 7.0 seconds/2 laps towing a streamer.

6.1 Number of models. One model per match. 3 models maximum per contest.

7.1 Pit crew. Two pit crew are allowed per contestant. A contestant may start his own engine.

8.1 Officials: A contest shall be run by a circle marshal who shall be the overall timekeeper, plus one scorer per contestant.

9.1 The match: One minute for engine starting and launching. The 5-minute match clock is started as the second plane launches or at the end of the one minute, whichever comes first. The match lasts 5 minutes.

Engines must be started by hand.

9.2 Scoring: One point is deducted for each second a contestant's plane is on the ground during the 5 minute match. 50 points are awarded for each cut of their opponent's streamer or string with knot. There are no kills.
The match shall continue after a mid-air collision or line break. Lines may not be changed during a match.

10.1 Contest Procedure: Each contestant shall compete in 5 rounds. 2 points for a win, 1 point for a tie, 0 for a loss. The top 4 flyers will than compete in 2 semifinals and a final to determine the winner.

10.2 Combat Site: A 3-foot radius pilots' circle and a concentric 65 foot radius safety circle.

ml/jt/FLballot#199//revise/dm/ballot/1-1-09//revise/gh/ballot/1-1-10//revise/kb/bw/ballot/4-17-10

mp/jmt/p/10-18-10/r1-16-11/r1-31-11/rballot1-6-12


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This page was upated March 24, 2021