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I have done a lot of work on ballast calculators in the past. I have never offered them up for use by TU members because I considered them complicated and clumsy. This one however, I consider to be very slick and versatile.

You can enter data from a first prototype and it will calculate how much ballast you need to add or subtract to achieve the buoyancy that you desire, be it slow sink, neutral or float.

Boxes 1 and 2 are merely to collect data on the body material in order to obtain the material density.

Boxes 3 and 4 are measured from a completed lure with hardware, hooks and topcoat.

Box 5 is your desired buoyancy, 100% = neutral buoyancy.

Box 6 is the density of the ballast. This can be changed if not using lead.

The calculation takes into account the body material removed or added to make room for the ballast.

PM your email to me if you would like to try this spreadsheet.

Dave116488497_TUballast.thumb.JPG.2aed18f505b715088ce03b8370321447.JPG

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Here are three examples of the application, aiming for neutral buoyancy. In each case the ballast adjustment is shown in the green box. It looks like the ballast adjustment values don’t add up, but this is because the material removed for the ballast hole(s) is taken into consideration.

I measured and weighed a block of the body material:
1.5cm x 1.5cm x 4xm = 9cm³
Weight = 2.39g.

EX1 – a completed lure with 10g ballast installed.
volume (Archimedes) = 21.2 cm³.
weight = 18.79g.

2028739494_TUbal1.thumb.JPG.fa1441454e61060af240a4f48f15b5b9.JPG

EX2 – a completed lure with no ballast installed.
volume (Archimedes) = 21.2 cm³.
weight = 8.79g.

786317050_TUbal2.thumb.JPG.6df70bab02824922d56fe28059678ba2.JPG

EX3 – a completed lure with 16g ballast installed.
volume (Archimedes) = 21.2 cm³.
weight = 24.79g.

946512552_TUbal3.thumb.JPG.febb6925c4571136b3bbb726677b64b2.JPG

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I would appreciate it if all those that requested copies of the ballast calculator brought feedback and suggestions of improvements to the table, either by PM or posted here.

Many thanks for the encouraging response.

Dave

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Vodkaman,

i was able to use your calculator on my first ever pours this morning. I got a sinking, very slow sinking, and floating flat sided crankbait with only adding a very small amount of lead to stabilize it! Super awesome and easy to use! Seriously one of the most helpful tools I’ve come across since i started making baits!

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Hi Dave,

Me too  I would like to try, could you please share calculator on my following email id. 

sudanraghu2210@hotmail.com

Thanks  & Regards, Raghubir

 

 

 

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Hi Dave

Thanks for sharing the excel, will start working on same.

I have some lure blanks to finish, will try to use the excel.

Regards, Raghubir

 

 

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