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).
Five engine cooling tests conducted on the Broccone Pass.
| Identifier | ExFiles\Box 24\4\ Scan011 | |
| Date | 17th September 1912 | |
| For Mr. 7HR P 18/5/12 TESTS ON THE BROCCONE PASS, 5,305 FT. SEPT. 17TH.1912. X747 Length. 10 miles. Good broad road, good surface, with wide bends. Gradient varies between 5% and 10%. Weather fine and dry. Second gear used practically throughout. First not used at all. 1st. Test. Closed bonnet, dashboard plate off. 8.30 a.m. Air temp. foot of pass. 9° Cel. " " summit. 7° Cel. Loss of water. 1-3/4 litres. 2nd. Test. Louvred bonnet, dashboard plate off. 10.10 a.m. Air temp. foot of pass. 11° Cel. " " summit. 9° Cel. Loss of water. 1 litre. 3rd. Test. Louvred bonnet with dashboard plate on. 12.30 p.m. Air temp. foot of pass. 14° Cel. " " summit. 11° Cel. Loss of water. 2-1/2 litres. 4th. Test. Closed bonnet, dashboard plate on. 2.30 p.m. Air temp. foot of pass. 16° Cel. " " summit. 15° Cel. Loss of water. 4-1/2 litres. 5th. Test. Without bonnet, dashboard plate on. 3.45 p.m. Air temp. foot of pass. 14° Cel. " " summit. 11° Cel. No loss of water. Temp. 90° Cel. on summit. F.D.J.M. | ||