If you want an historically accurate batwing rig, here are the ---

Batwing Spar Sizes

--- otherwise read the Notes below.

Sail and spar measurements are recorded in Rushton's "Books of Knowledge".

Sail Area
in sq ft

-A-
Boom & Yard
Diameter

-B-
Lower Batten
Diameter

-C-
Upper Batten
Diameter

36 & 47

Luff:

3/4"

Mid:

7/8"

Leech:

1/2"

3/4" or t f j

3/4"

1/2"

3/4"

3/4"

1/2"

70

Luff:

3/4"

Mid:

1-1/8"

Leech:

1/2"

3/4" or tfj

7/8"

1/2"

3/4"

3/4"

1/2"

87

Luff:

7/8"

Mid:

1-1/4"

Leech:

3/4"

7/8" or tfj

7/8"

3/4"

3/4"

7/8"

5/8"

103

Luff:

7/8"

Mid:

1-3/8"

Leech:

3/4"

same as 87 same as 87

Extra Reefing Batten (Dotted)

87 & 103

Luff:

3/4"

Mid:

7/8"

Leech:

1/2"

Centered on bottom panel -- --

Mast Diameter is the same for all rigs:
2" at heel and 1-3/8" at head. If you use a mast tube on your boat, cut the heel to fit its inside diameter as appropriate. 1/8" more or less won't matter. A rectangular or square 'box' to fit mast heel is also OK.
Note that the Bailey Rig spars are the same sizes as the Batwing spars. Bailey 30 = Bat 36, Bailey 40 = Bat 47, Bailey 60 = Bat 70, Bailey 75 = Bat 87, Bailey 90 = Bat 103.

t f j: "to fit jaws" or other mast fitting. See (not available yet).
Otherwise, work from the spar's "mid" dimension.

Notes: battens in larger sizes seem to have been oval rather than round, so the "Diameter" probably refers to the longer vertical dimension.

About Ferrules:
The original spars had protective metal ferrules on:
- The luff end of the Boom and Yard (to go into mast fittings).
- The tip of the Mast.
- The luff end of the extra Reefing Batten in the largest two sails (mast fitting).
About Rigging

COD 5/13/97

COD 5/11/98

COD 11/18/00