Mast Spar Hole: Dimensions and Moving

published 05/22/2023

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Questions:

• Can the spar hole be cut out to be larger than the maximum measurement?
• Can the spar hole be moved fore and aft after the boat is built?

Answer:
Rule C.7.1.(b) in the 2022 Class rules provides answers to these questions.
(b) The size, shape, and position of the mast spar hole in the deck may be modified, and limited extra reinforcement (in addition to Standard Materials, reinforcement materials may include acetyl or G10) may be added, providing the resulting hole in the deck in which the mast may move complies with the dimensions in this table:  

	Minimum	Maximum
Longitudinal distance from hull datum point to the centre of mast spar hole at deck level on the centreline	5472 mm	5497 mm
Length of mast spar hole	200 mm	204 mm
Width of mast spar hole	98 mm	102 mm

Submitted by the Swan River Fleet       

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