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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.


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


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


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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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I would love to try this out and provide feedback. Thank you for sharing this.


I make allot of one off baits and this could prove very helpful with the design and speed up my tank testing. Currently i fill the baits with more lead than i need and drill out. Float test. Drill Out Float test...... repeat........ Until i get the result i want. Thus the baits tend to have the weight higher up in the belly and require more filler. 




Thanks :)

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3 hours ago, Vodkaman said:

mmanolis2001 - file sent.


Got it. Thanks :)

Working on a small glide bait now. This will prove helpful im sure..

Ok now for my first dumb question,

How are you determining your wood density? I see you are using Body Material volume (L x W x H) X (0.265)

How are you  determining the Density value of 0.265? I see charts on the web listing wood density as cubic kg/m or lb/ft 





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Do NOT rely on published data to determine material density for the chart, it is simply not accurate enough, there are too many variations between samples even from the same tree.

You will need to use Archimedes for the shaped body as there is no other way of obtaining the data that comes close in accuracy. If you are hoping to get anywhere near a neutral buoyancy (suspender) then accuracy is everything.

Also, do not even think about working in inches and ounces. If you want to use engineering to help you, then get used to centimeters and grams. Believe me, it is a lot easier.


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1 - Place a container of water on the gram scale and zero the display.

2 - Insert the lure assembly using long nose pliers or tweezers so that the lure is completely submerged and not touching sides or bottom.

3 - Write down the weight in grams.

4 – Weigh the dry lure assembly in grams, write down the weight.

The weight (3) represents the volume of the lure cm³.
Density is measured in grams per centimeter cubed (gm/cm³).
To calculate the lure assembly density:
density = weight(4) ÷ weight(3)


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