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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Model frame bending test results comparing a frame with an 'X' member to one with two extra tubular members.

Identifier  ExFiles\Box 14\8\  Scan060
Date  23th May 1928 guessed
  
MODEL FRAME TESTS.

Bending test. Frame horizontal. One channel clamped to bed, each transverse member supported on a roller at the centre, free channel loaded at centre of X; member.

TEST WITH 'X' MEMBER COMPLETE AND FRONT TUBULAR MEMBER.

| Load. lbs. | Deflection, at A.{Mr Adams} ins. | Deflection, at B. ins. | Deflection, at C. ins. |
|------------|--------------------------|--------------------------|--------------------------|
| 100 | .016 | .018 | .014 |
| 200 | .029 | .028 | .025 |
| 300 | .044 | .044 | .036 |
| 400 | .057 | .060 | .047 |
| 500 | .071 | .077 | .059 |

'X' MEMBER REPLACED BY TWO EXTRA TUBULAR MEMBERS.

| 100 | .010 | .016 | .013 |
| 200 | .022 | .029 | .026 |
| 300 | .037 | .041 | .036 |
| 400 | .049 | .053 | .048 |
| 500 | .061 | .066 | .060 |
  
  


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