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).
Test results for a model frame cross member under various load and configuration conditions.
| Identifier | ExFiles\Box 14\8\ Scan057 | |
| Date | 11th May 1928 | |
| 11.5.28. CROSS MEMBER TESTS - MODEL FRAME. Test No. 1. X member complete, including tubular member. " " 2. Tubular member removed. " " 3. Diagonal bracers removed. " " 4. Front, rear, and side gussets removed. " " 5. All gu-ssets refitted, bolts in corner plates removed. " " 6. X replaced by 3 tubular members ++ | Load on each corner. lbs. | Total deflection at corners - ins. | |---------------------------|------------------------------------------------------------------| | | TEST No. | | | 1 | 2 | 3 | 4 | 5 | 6 | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | | 100 | .023 | .022 | .023 | .020 | .034 | .123 | | 200 | .058 | .058 | .059 | .045 | .070 | .307 | | 300 | .086 | .086 | .091 | .083 | .118 | .575 | | 400 | .116 | .116 | .122 | .120 | .160 | 1.026 | | 500 | .142 | .142 | .160 | .156 | .202 | | Frame balanced about centre line of one member of the X. Balance load 5 1/2 lbs. Balance load 7 lbs. ++ Load radius about centre of X member long side = 13.6" " " " " " " " " short side = 12.650" -------------------- | ||