Calculating mast size (and possibly location)

[Seagull Shipwright]

AllenKP69 my interest’s cross with your expertise again, thankfully for me but not sure from your perspective!

I have a sail plan for my Brigantine, a Packet Ship called Seagull dated 1835 ish original plan 1829/1830 as a three masted vessel, subsequently remodelled as a Brigantine. I think I have posted the sail plan already. It has a scale and from this I have scaled the mast lengths as:-

Length of deck 95’ and beam 26’ (for reference)

Keel to very top of main mast =115’
Keel to very to of Fore mast =103’- 6”

Can you give me any guidance as to whether these are correct I cannot get to these measurements from the formulae.

Thanks…….

 

[AllanKP69]

Sorry Seagull, all the scantlings I have are for English warships so possibly of little use. IF it turns out that they are complimentary, you can use the formulas in James Lees' The Masting and Rigging of English Ships of War 1625-1860 for the mast diameters and lengths as well as yard sizes and rigging line sizes. Maybe contact RMG which has the drawings you probably have to see if this idea would be a good one or not.

Allan

 

[Seagull Shipwright]

Sorry Seagull, all the scantlings I have are for English warships so possibly of little use. IF it turns out that they are complimentary, you can use the formulas in James Lees' The Masting and Rigging of English Ships of War 1625-1860 for the mast diameters and lengths as well as yard sizes and rigging line sizes. Maybe contact RMG which has the drawings you probably have to see if this idea would be a good one or not.

Allan

Allan,

Thanks for the reply I will continue my quest…..Jeremy

 

[Seagull Shipwright]

Hi all…….i am continuing my quest to finalise my rigging arrangements.

The Seagull Packet has the following dimensions:-

Length between perpendiculars 95’
Beam 26’
Depth of hold 11’- 2”
Burthen 280 tons.

Would you scale the drawing below for the housing, hounded length and doubling or are these schematic, although there is a scale on the drawing?

From the sketch and help by other SOS members the masts are:-
Fore, Foretop and ForeGallant and the Main and Main Top.

Using “ The Ship Model Builder’s Assistant” I have estimated 49’ based on the Packet Courier and pro-rata the sizing and 58’ - 6” using (Beam x 75)/100 in yards and converted to feet and 78’ based on beam x 3.

Scaling the drawing gave 82’

Where do I go from here? Thanks ………

 

[Roger Pellett]

Books like the Ship Model Builders AssIstant and contemporary texts like Steel’s provide rules of thumb for typical rigs. In the absence of specific information they are useful.

On the other hand, you have specific information for determining spar dimensions in the form of the graphic scale on the sail plan. Use it!

Roger