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Technical Committee Reports

DN Mast Interpretation Issued by the Technical Committee

Effective Date: 
February 15, 2013

C. Mast

02/15/2013
In specifications C.3.f. and C.3.g., the term "stays" includes all components and devices used to connect the cables to the mast hound at the height of the lower mast hound bolt, reference specification H.13., All components and devices used to connect the cables to the mast hound at the height of the lower mast hound bolt must be removed from the mast when determining the weight, C.3.f., and the balance point, C.3.g.

Link to the new Interpretation of Official Specifications of DN IceYacht

DN Runner Interpretation Issued by the Technical Committee

Effective Date: 
January 15, 2013

E. Runners

01/15/2013
In runner specifications and interpretations runner stiffening elements, i.e. "stiffeners", and runner reinforcement have differing allowed uses, allowed materials, and dimensions.

On plate style runners, stiffening elements are controlled by specifications E.1.; E.1.d., e.,f.; E.4; E.6. and interpretations E. Runners dated 11/14/89, 7/1/92; four interpretations dated 1/15/2010; and I. Fittings dated 1/15/2010

Stiffening elements and reinforcement of the body of wood body runners are controlled by specifications E.2.a., d., e.; E. 4.; E. 6. and interpretations E. Runners dated 10/17/83; 11/23/87; 7/1/92; 11/30/98; four interpretations dated 1/15/2010; 12/01/2012; and I. Fittings dated 1/15/2010

On wood body runners, allowed material added to the body which is outside the allowed maximum body thickness of 1 1/32 inch (26.1 mm) is considered a runner stiffener or stiffening element. Allowed material added to the outside of the wood body, or in the slot of insert style runners, that does not exceed the allowed maximum body thickness of1 1/32 inch (26.1 mm) is considered external reinforcement.

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Link to the new Interpretation of Official Specifications of DN IceYacht

DN Sail Measuring Procedure Issued by Technical Committee

Effective Date: 
December 01, 2012

G. Sail

12/01/2012
Procedure for measuring a DN Sail
  1. Preparing the sail for measuring:
    1. The sail shall be free of the mast and boom.
    2. Battens should be removed.
    3. Lay the sail on a hard surface (table, floor, or ice sailing surface).
    4. Measure each specified dimension one-at-a-time with tension applied only across the line of measurement as is sufficient to remove wrinkles, except as specified in G.17 and G.24.
    5. Use the following points of measurement when measuring location of battens and batten pockets and pocket angles.
      1. Locate the straight line leech by stretching a string or small diameter rope from the forward upper corner of the headboard to the clew, excluding the bolt rope. (ref. G.17 and interpretation G. Sail dated 11/20/2011)
      2. The top edge of a batten pocket is located along the top of the inside width of the pocket.
      3. The centerline of the batten pocket is located in the center of the inside width of the pocket.
    6. Use the location of the forward upper corner of the headboard (ref. interpretation dated 11/20/2011) as the location of the hole in the head of the sail when folding to measure the girth. (ref. G.18)
  2. To determine the location of the top batten pocket and spacing between battens, (ref G.7):
    1. In G.7 the measuring point on the top of the headboard is located at the forward upper corner of the headboard (ref. interpretation G. Sail 11/20/2011). All points along the top edge of the pocket must comply the 27" (686 mm) minimum dimension from the head. (ref. 5 b. above)
    2. The spacing between the battens is measured between the centerline of the batten pockets where the centerline intersects the straight line leech. (ref. 5.c. above)
  3. To determine the angle of the batten pockets. (ref. G.8)
    1. Measure the angle between the straight line leech (ref. 5.a. above) and the top edge of the batten pocket.(ref. 5.b. above)
    2. Measure one-pocket-at-a-time.
    3. Place the base of a protractor along the straight line leech, centered at the top edge of the batten pocket (ref. 5.b. above) , and facing the luff.
    4. Read the angle at the top edge of the pocket. (ref. 5.b. above)

Link to the new Interpretation of Official Specifications of DN IceYacht

DN Runner Interpretations Issued by the Technical Committee

Effective Date: 
December 01, 2012

E. Runners

12/01/2012
The interpretation dated 11/14/89 is amended to read as follows: Wood, metal, or carbon stiffeners may be added to wood body runners (as in E.1.e. for plate runners) as long as the minimum wood body meets the imensions in E.2.a. and the stiffener is outside the wood body. No wood, metal or carbon stiffener may come between the insert plate and the slot in the wood body. No metal or carbon stiffening is allowed inside the main wood body.
12/01/2012
It is allowed to apply a coating to cover the surface of the steel plate, angle, or T used in a runner. The steel, without the coating,shall comply with the dimensions specified in E.1.a.,b.,c.; E.2.f. and E.2.h.

Link to the new Interpretation of Official Specifications of DN IceYacht

DN Rigging and Fittings Interpretation issued by the Technical Committee

Effective Date: 
December 10, 2011

A. Fuselage

12/10/2011
Rigging and fittings are not part of the integral structure or reinforcement of the fuselage and may be attached to the fuselage by mechanical fastenings and/or adhesives. The materials allowed in the rigging and fittings attached to the fuselage are optional providing they comply with the Specifications in Section A. Fuselage, Section H. Rigging, and Section I. Fittings and the Interpretations in section General, section A. Fuselage, section H. Rigging, and Section I. Fittings.

Link to the new Interpretation of Official Specifications of DN IceYacht

DN Sail Interpretations & Governing Committee Special Ruling

Effective Date: 
November 20, 2011
  1. New interpretation
    11/20/2011
    In Specification G.8. the leech is a straight line from the head to the clew. Reference Specification G.17 and Interpretations G. Sail.
  2. Specification Spelling Correction
    11/20/2011
    In Specification G.17 the spelling of the word "leach" is corrected to "leech".
  3. Amend the Interpretation G. Sail dated 3/18/89 to read:
    3/18/89 amended 11/20/2011
    InSpecifications G.8. G.17 and G.24 the location of the forward upper corner of the headboard is determined by projecting
    a straight line parallel to the luff (excluding the bolt rope) to the point
    where it intersects with a line projected from the uppermost point of
    the headboard and perpendicular to the luff.
  4. The IDNIYRA Governing Committee Special Ruling effective
    11/20/2011

    The batten pockets in all sails made prior to 1/1/2012 shall lie at 90
    degrees plus or minus 8 degrees to the leech. These sails may be
    used in all DN races, including all championships. All other sails
    must comply with Specification G.8.

Link to the new and amended Interpretation of Official Specifications of DN IceYacht

DN Runner Plank Interpretation Issued by Technical Committee

Effective Date: 
October 06, 2011

B. Runner Plank

11/30/98 amended 10/6/2011
The runner plank must be constructed of wood and meet all minimum dimensions in specifications B.1., 2., 3., 4., 5. before the application of external reinforcement and coatings; and meet all the maximum dimensions in n specifications B. 1., 2., 3., 4., 5. after the application of any external reinforcement and coatings. Internal fiberglass reinforcement is not allowed. Foam, honeycomb, and other non-wood core materials are not allowed.

Link to the new Interpretation of Official Specifications of DN IceYacht

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