Opening the text

Langley Memoir on Mechanical Flight, Parts I and II: Smithsonian Contributions to Knowledge, Volume 27 Number 3, Publication 1948, 1911Langley, S. P. (Samuel Pierpont)

History

Langley Memoir on Mechanical Flight, Parts I and II: Smithsonian Contributions to Knowledge, Volume 27 Number 3, Publication 1948, 1911

Name: Langley Memoir on Mechanical Flight, Parts I and II: Smithsonian Contributions to Knowledge, Volume 27 Number 3, Publication 1948, 1911
Author: Langley, S. P. (Samuel Pierpont)

Langley, S. P. (Samuel Pierpont)

Aeronautics; Flight

Revolutions of   Velocity of   Resistance.   Calculated resistance
 turn-table per   frame. Feet    Grammes.         of frame.
   minute.        per minute.      ‹r.›           Grammes.
      6.75            608          11.5             14.2
      9.75            877          34.0             29.6
     12.0            1080          51.8             44.8
     16.35           1475          97.0             83.8
     19.75           1775         134.0            121.3
     22.7            2045         168.0            161.2
     25.5            2290         205.0            202.0


 RESISTANCE OF FRAME WITH 1ST SET OF WIRES.

 First set of wires: 16 wires, 0.6 mm. diameter, 102 cm. long; 6
 wires, 0.6 mm. diameter, 42 cm. long.

 Revolutions    Velocity of  Resistance   Resistance    Calculated
 of turn-table  wires. Feet   of frame    of wires.     resistance
 per minute.    per minute.  and wires.   R_1−r=r_1.     of wires.
                              Grammes.                   Grammes.
                               R_1.
     9.75           877         47.5         13.5          8.88
    12.0           1080         73.5         21.7         13.47
    13.75          1237         93.5         25.5         17.65
    17.25          1550        144.0         37.0         27.7
    20.25          1822        187.0         45.5         38.4
    22.50          2025        216.0         47.5         47.4
    22.875         2060        225.0         52.0         49.0
    24.56          2215        250.0         56.5         56.7


 RESISTANCE OF FRAME WITH 2D SET OF WIRES.

Second set of wires: 15 wires, 1.2 mm. diameter, 102 cm. long; 2
wires, 1.2 mm. diameter, 42 cm. long.

  Revolutions   Velocity of  Resistance   Resistance    Calculated
 of turn-table  wires. Feet   of frame     of wires.    resistance
  per minute.   per minute.  and wires.   R_2−r=r_2.    of wires.
                              Grammes.                   Grammes.
                               R_2.
     9.25          833          54.0         26.5         15.35
     9.35          841         55.0          27.0         15.4
    11.3          1018         82.0          36.75        22.65
    11.5          1035         82.0          35.25        23.4
    13.0          1170        104.5          43.0         29.9
    13.15         1185        105.0          42.5         30.60
    16.7          1505        160.0          59.0         49.5
    16.75         1510        160.0          58.0         49.9
    19.5          1755        196.0          64.0         67.4
    19.7          1770        203.0          69.5         68.5
    21.60         1945        236.0          77.0         82.6
    21.65         1950        237.0          77.75        83.2
    21.75         1957        235.0          75.5         83.7

 RESISTANCE OF FRAME WITH 3D SET OF WIRES.

 Third set of wires: 15 wires, 2 mm. diameter, 102 cm. long; 2 wires,
 2 mm. diameter, 42 cm. long.

Public-domain text, read in full here on John Shaqi.

Opening the text

Langley Memoir on Mechanical Flight, Parts I and II: Smithsonian Contributions to Knowledge, Volume 27 Number 3, Publication 1948, 1911Langley, S. P. (Samuel Pierpont)

History

Langley Memoir on Mechanical Flight, Parts I and II: Smithsonian Contributions to Knowledge, Volume 27 Number 3, Publication 1948, 1911

Langley, S. P. (Samuel Pierpont)

Aeronautics; Flight

Revolutions of   Velocity of   Resistance.   Calculated resistance
 turn-table per   frame. Feet    Grammes.         of frame.
   minute.        per minute.      ‹r.›           Grammes.
      6.75            608          11.5             14.2
      9.75            877          34.0             29.6
     12.0            1080          51.8             44.8
     16.35           1475          97.0             83.8
     19.75           1775         134.0            121.3
     22.7            2045         168.0            161.2
     25.5            2290         205.0            202.0


 RESISTANCE OF FRAME WITH 1ST SET OF WIRES.

 First set of wires: 16 wires, 0.6 mm. diameter, 102 cm. long; 6
 wires, 0.6 mm. diameter, 42 cm. long.

 Revolutions    Velocity of  Resistance   Resistance    Calculated
 of turn-table  wires. Feet   of frame    of wires.     resistance
 per minute.    per minute.  and wires.   R_1−r=r_1.     of wires.
                              Grammes.                   Grammes.
                               R_1.
     9.75           877         47.5         13.5          8.88
    12.0           1080         73.5         21.7         13.47
    13.75          1237         93.5         25.5         17.65
    17.25          1550        144.0         37.0         27.7
    20.25          1822        187.0         45.5         38.4
    22.50          2025        216.0         47.5         47.4
    22.875         2060        225.0         52.0         49.0
    24.56          2215        250.0         56.5         56.7


 RESISTANCE OF FRAME WITH 2D SET OF WIRES.

Second set of wires: 15 wires, 1.2 mm. diameter, 102 cm. long; 2
wires, 1.2 mm. diameter, 42 cm. long.

  Revolutions   Velocity of  Resistance   Resistance    Calculated
 of turn-table  wires. Feet   of frame     of wires.    resistance
  per minute.   per minute.  and wires.   R_2−r=r_2.    of wires.
                              Grammes.                   Grammes.
                               R_2.
     9.25          833          54.0         26.5         15.35
     9.35          841         55.0          27.0         15.4
    11.3          1018         82.0          36.75        22.65
    11.5          1035         82.0          35.25        23.4
    13.0          1170        104.5          43.0         29.9
    13.15         1185        105.0          42.5         30.60
    16.7          1505        160.0          59.0         49.5
    16.75         1510        160.0          58.0         49.9
    19.5          1755        196.0          64.0         67.4
    19.7          1770        203.0          69.5         68.5
    21.60         1945        236.0          77.0         82.6
    21.65         1950        237.0          77.75        83.2
    21.75         1957        235.0          75.5         83.7

 RESISTANCE OF FRAME WITH 3D SET OF WIRES.

 Third set of wires: 15 wires, 2 mm. diameter, 102 cm. long; 2 wires,
 2 mm. diameter, 42 cm. long.

Public-domain text, read in full here on John Shaqi.

Langley Memoir on Mechanical Flight, Parts I and II: Smithsonian Contributions to Knowledge, Volume 27 Number 3, Publication 1948, 1911

Langley Memoir on Mechanical Flight, Parts I and II: Smithsonian Contributions to Knowledge, Volume 27 Number 3, Publication 1948, 1911

No reviews yet