# Need help with density of wood.

35 replies to this topic

### #21 rofish

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Posted 07 January 2008 - 03:23 AM

Up to now, I have not heard about such a thing as board foot. Now I know what it represents:
http://en.wikipedia....wiki/Board_foot
Learning new things about lure making is the main reason for my being here

### #22 Spike-A-Pike

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Posted 07 January 2008 - 06:26 AM

About the only area were the US has gotten the metric system down as a standard unit of measurement is medicine. And there is still some work in that area too. Insulin dosages are figured in units, American insulin companies state that there are 100 units to the cubic centimeter. Wouldn’t that be a cubic millimeter?

### #23 Vodkaman

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Posted 07 January 2008 - 06:44 AM

I was wondering when you were going to Plaster of Paris in for a visit!

There are 1000 cubic mm in a cubic cm (10x10x10). Therefore one unit = 10 cubic mm.

### #24 rofish

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Posted 07 January 2008 - 06:54 AM

Let's put it in another way:
1 cubic meter = 1,000 cubic decimeters
1 cubic decimeter (which is also 1 liter) = 1,000 cubic centimeters
1 cubic centimeter = 1,000 cubic milimeters.
So simple. Anyone willing to try?

### #25 rofish

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Posted 07 January 2008 - 07:37 AM

To compare (I've just found it out from the net):
1 US gal. = 8 US pt
1 US pt = 16.000000673 US fl.oz.
1 ft3 = 1,728.0006297652 in3

### #26 Palmetto Balsa

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Posted 07 January 2008 - 09:14 AM

Here are the 2 formulas for density and pounds per cubic foot.

Density
Grams / Cubic cm = Density
http://en.wikipedia.org/wiki/Density Water=1 and Air=0

Pounds per Cubic Foot of a specific piece of wood.
1728 / Cubic Inches x Ounces / 16 = Pounds per Cubic Foot

(1728 inches in a cubic ft divided by, cubic inches of your piece of wood times, ounces of your piece of wood divided by, 16 ounces in a pound is equal to the pounds per cubic foot of you piece of wood.)
I think I've got it.
Thanks for all the help.
Now I have to grab my pieces of Paulownia to see what I have. (slow growth or fast growth.)

### #27 mark poulson

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Posted 07 January 2008 - 09:22 AM

Vman,
I actually do a fair amount of conversion to metric in my work. European cabinetry and fittings. And Japanese and Chinese stuff, too.
I just enjoy the differences. I do not, however, grasp the "stones" concept yet. No, not those stones ).

### #28 Vodkaman

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Posted 07 January 2008 - 09:49 AM

I think stones are more a British thing. About the only thing they are used for is body weight. Large bags of potatoes, cement etc are sold by the hundred weight, which is 112 lbs or 8 stones! It just gets worse.

Britain was resqued from a lot worse about 35 years ago. The monetary system was called LSD. LSD helped to get your head around it. Twelve pennies in a shilling, twenty shillings in a pound. One pound and one shilling in a guinnea. The coins were: farthing, hap'ny, penny, thripny bit, tanner, shilling (bob), floreign (2 bob), half a crown (2 'n 6), crown (5 bob), ten shilling note and a quid. To think people fought tooth and nail against decimalization!

### #29 Spike-A-Pike

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Posted 07 January 2008 - 11:16 AM

Thanks Vman,

I guess our monetary system is sort'a metric based also.

5 pennies to nickle,
10 pennies or 2 nickles to a dime
25 pennies or 5 nickles or 2 dimes + 1 nickle to a quarter
50 pennies or 10 nickles or 5 dimes or 2 quarters to a half dollar
100 pennies or 20 nickles or 10 dimes or 4 quarters to a dollar

SImple... So simple, most school kids won't bother with anything less than a dollar, spoiled little brats... lol

### #30 mark poulson

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Posted 07 January 2008 - 11:20 AM

But our nails are still measured in penny weights, and lots of other construction materials are still measured in "English".

### #31 Vodkaman

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Posted 07 January 2008 - 12:06 PM

Another scarey fact, most aircraft are designed in feet and inches. Every car I have worked on has been designed in metric.

### #32 keram

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Posted 07 January 2008 - 12:58 PM

Bottom line is that, nominally one metric lure builder is equal to one imperial lure builder:). Everything else is just semantics:wink:

### #33 mark poulson

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Posted 07 January 2008 - 04:09 PM

keram,
Try telling that to the Mars Lander team whose lander overshot or crashed (they're not sure which) when one team used Imperial and the other used Metric.

### #34 Spike-A-Pike

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Posted 07 January 2008 - 06:04 PM

keram,
Try telling that to the Mars Lander team whose lander overshot or crashed (they're not sure which) when one team used Imperial and the other used Metric.

They weren't TU members and instead of a "Mars Lander" they should have been working on a "Mars Lure". Hey if they find water, just think of a the new Martian fish records that you'd be setting every trip out to the water... What the hey, it could happen like that... lol

### #35 dbbigwoodlures

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Posted 09 January 2008 - 06:34 PM

I'm not real sure about calculating any density of wood, but if you are concerned about the ballast and balancing of any lure, the added weight of treble hooks, eye screws, lexan lips, and split rings is usually enough to give a balsa wood lure the ballast it needs to float vertically, provided that the lure is roughly shaped like a plug and not a surf board

blackjack