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About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Balsa Weight for Various Densities

Wood Properties
Species Weight

lb/ft3

Stiffness

Strength

Bending

Strength

Comp-

ression

Strength

Balsa 8 72 70 75
Balsa 10 100 100 100
Balsa 14 156 161 149
Spruce 28 230 260 289
Yellow Pine 28 222 277 288
Douglas Fir 30 241 291 341
Hickory 50 379 638 514
Oak 48 295 430 366
Basswood 26 261 288 288
Black Walnut 37 301 506 512
From Wikipedia: Ochroma pyramidale, commonly known as the balsa tree, is a large, fast-growing tree native to the Americas. It is the sole member of the genus Ochroma. The name balsa comes from the Spanish word for "raft."

Balsa Weight for Various Densities - RF CafeBalsa is one of the lightest woods available, and in many respects has the highest strength-to-weight ratio of any wood - even oak. The chart at the right gives a comparison of a few familiar wood types.

Hobby grade balsa is harvested in the jungles of Ecuador, kiln dried, cut into large blocks, and shipped to the U.S. for final cutting and sanding. Most balsa from hobby shops is in the 8-10 lbs/ft3 realm. The rock-hard stock that nobody wants is sent to the airplane kit manufacturers ;-) The vast majority of the balsa wood I use for building model airplanes comes from Sig, Midwest, and Balsa USA. Other suppliers have materialized in the past few years.

Since the rise of mammoth wind turbines for electricity generation, balsa's use as a core material for blades has caused a severe shortage in the modeling realm. Balsa prices have skyrocketed in the past decade. Substitutes for balsa wood are being frantically sought. See: Wuhan Flu Outbreak Leaves China Short on Balsa for Turbine Blades," "Balsa Shortage Threatens Wind Power Rollout," "The Wood Behind the Wind."

Before being discovered as an ideal source of wood for model airplanes, balsa trees were cut and assembled into raft for floating down the river. In fact, the word "balsa" is Spanish for the word "raft." Balsa has been widely used by the military for air-drop pallets, and in fact, during World War II, balsa wood for models became scarce because the Army Air Force needed it for operations. Bamboo and other reeds were tried by modelers as a substitute wood, but it never could replace balsa.

The charts below for weights of standard hobby shop balsa sheets, sticks and blocks were calculated from a simple formula that takes the density of the of each piece of balsa and multiply it by the volume. For 48" lengths, multiply each 36" value by 4/3 (1.333).

Example:

A 3/16" x 3" x 36" sheet of balsa has a volume of 20.25 cubic inches (in3), which is equal to 0.01171875 cubic feet (ft3). A piece of balsa with a density of 8 lbs/ft3 is the same as a density of 128 oz/ft3. So, to find the weight of the balsa sheet, multiply 128 oz/ft3 by 0.01171875 ft3 to get 1.500 oz. A 48" length would weigh 1.500 oz. x 4/3 = 2.000 oz.

BALSA SHEETS

Weight in Ounces, Density in Pounds/Foot3

36" Length 6 8 10 12 14 16
1/32"x2"

1/32"x3"

1/32"x4"

0.125

0.188

0.250

0.167

0.250

0.333

0.211

0.313

0.417

0.250

0.375

0.500

0.291

0.438

0.583

0.333

0.500

0.667

3/32"x2"

3/32"x3"

3/32"x4"

0.375

0.563

0.750

0.500

0.750

1.000

0.625

0.938

1.125

0.750

1.125

1.500

0.875

1.313

1.750

1.000

1.500

2.000

3/16"x2"

3/16"x3"

3/16"x4"

0.750

1.125

1.500

1.000

1.500

2.000

1.250

1.875

2.500

1.500

2.250

3.000

1.750

2.625

3.500

2.000

3.000

4.000

3/8"x2"

3/8"x3"

3/8"x4"

1.500

2.250

3.000

2.000

3.000

4.000

2.500

3.750

5.000

3.000

4.500

6.000

3.500

5.250

7.000

4.000

6.000

8.000

1/16"x2"

1/16"x3"

1/16"x4"

0.250

0.375

0.500

0.333

0.500

0.667

0.417

0.625

0.833

0.500

0.750

1.000

0.583

0.875

1.167

0.667

1.000

1.333

1/8"x2"

1/8"x3"

1/8"x4"

0.500

0.750

1.000

0.667

1.000

1.333

0.833

1.250

1.667

1.000

1.500

2.000

1.167

1.750

2.333

1.333

2.000

2.667

1/4"x2"

1/4"x3"

1/4"x4"

1.000

1.500

2.000

1.333

2.000

2.667

1.667

2.500

3.333

2.000

3.000

4.000

2.333

3.500

4.667

2.667

4.000

5.333

1/2"x2"

1/2"x3"

1/2"x4"

2.000

3.000

4.000

2.667

4.000

5.333

3.333

5.000

6.667

4.000

6.000

8.000

4.667

7.000

9.333

5.333

8.000

10.667

BALSA BLOCKS
Weight in Ounces, Density in Pounds/Foot3

36" Length 6 8 10 12 14 16
1"x1"

1"x1½"

1"x2"

1"x2½"

1"x3"

2.000

3.000

4.000

5.000

6.000

2.667

4.000

5.333

6.667

8.000

3.333

5.000

6.667

8.333

10.00

4.000

6.000

8.000

10.000

12.000

4.667

7.000

9.333

11.667

14.000

5.333

8.000

10.667

13.333

16.000

2"x2"

2"x2½"

2"x3"

8.000

10.00

12.00

10.666

13.333

16.000

13.333

16.667

20.000

16.000

20.000

24.000

18.667

23.333

28.000

21.333

26.667

32.000

3"x3"

3"x4"

18.00

24.00

24.00

32.00

30.000

40.000

36.000

48.000

42.000

56.000

48.000

64.000

1½"x1½"

1½"x2"

1½"x2½"

4.500

6.000

7.500

6.000

8.000

10.00

7.500

10.000

12.500

9.000

12.000

15.000

10.500

14.000

17.500

12.000

16.000

20.000

2½"x2½"

2½"x3

12.500

15.000

16.667

20.000

20.833

25.000

25.000

30.000

29.166

35.000

33.333

40.000

BALSA STICKS

Weight in Ounces, Density in Pounds/Cubic3

36" Length Qty. 6 8 10 12 14 16
1/16"x1/16"

1/16"x3/32"

1/16"x1/8"

1/16"x3/16"

1/16"x1/4"

1/16"x3/8"

1/16"x1/2"

16

16

8

8

4

4

2

0.125

0.188

0.125

0.188

0.125

0.188

0.125

0.167

0.250

0.167

0.250

0.167

0.250

0.167

0.208

0.312

0.208

0.312

0.208

0.312

0.208

0.250

0.375

0.250

0.375

0.250

0.375

0.250

0.292

0.438

0.292

0.438

0.292

0.438

0.292

0.333

0.500

0.333

0.500

0.333

0.500

0.333

1/8"x1/8"

1/8"x3/16"

1/8"x1/4"

1/8"x3/8"

1/8""x1/2"

4

4

4

2

1

0.125

0.188

0.250

0.188

0.125

0.167

0.250

0.333

0.250

0.167

0.208

0.312

0.416

0.312

0.208

0.250

0.375

0.500

0.375

0.250

0.292

0.438

0.538

0.438

0.292

0.333

0.500

0.667

0.500

0.333

1/4"x1/4"

1/4"x3/8"

1/4"x1/2"

1/4"x3/4"

1/4""x1"

1

1

1

1

1

0.125

0.188

0.250

0.375

0.500

0.167

0.250

0.333

0.500

0.667

0.208

0.312

0.416

0.625

0.832

0.250

0.375

0.500

0.750

1.000

0.292

0.438

0.583

0.876

1.166

0.333

0.500

0.667

1.00

1.333

1/2"x1/2"

1/2"x1"

1

1

0.500

1.000

0.667

1.333

0.832

1.666

1.00

2.00

1.166

2.333

0.1333

2.667

3/32"x3/32"

3/32"x1/8"

3/32"x3/16"

3/32"x1/4"

3/32"x3/8"

3/32"x1/2"

8

8

4

4

2

2

0.141

0.188

0.141

0.188

0.141

0.188

0.188

0.250

0.188

0.250

0.188

0.250

0.234

0.312

0.234

0.312

0.234

0.312

0.281

0.375

0.281

0.375

0.281

0.375

0.326

0.438

0.326

0.438

0.326

0.438

0.375

0.500

0.375

0.500

0.375

0.500

3/16"x3/16"

3/16"x1/4"

3/16"x3/8"

3/16"x1/2"

3/16"x3/4"

3/16"x1"

2

2

2

1

1

1

0.141

0.188

0.281

0.188

0.281

0.375

0.188

0.250

0.375

0.250

0.375

0.500

0.234

0.312

0.469

0.312

0.469

0.625

0.281

0.375

0.563

0.375

0.563

0.750

0.326

0.438

0.656

0.438

0.656

0.876

0.375

0.500

0.750

0.500

0.750

1.000

3/8"x3/8"

3/8"x1/2"

1

1

0.281

0.375

0.375

0.500

0.469

0.625

0.563

0.750

0.656

0.876

0.750

1.000

3/4"x3/4" 1 1.125 1.500 1.875 2.250 2.625 3.000
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