this 1934 Hispano-Suiza 12Y V12 unlimited hydroplane is coming to auction... in case you've got room in the boathouse and a long flat lake

the largest single-engine racing boat built in France in the" unlimited "class was handbuilt by the Chauvière boatyard at Vitry-sur-Seine with a strong double-diagonal mahogany planked hull using thousands of countersunk copper rivets.

2,196 cubic inches - 36 liters - and powered by six Hispano twin-barrel carburetors.

https://silodrome.com/v12-powered-wooden-hydroplane/
http://www.bonhams.com/auctions/24882/lot/345/?category=list&length=100&page=2