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 report detailing the load required to operate radiator shutters at various speeds.
| Identifier | ExFiles\Box 82\1\ scan0324 | |
| Date | 11th December 1933 | |
| XV153a Hotel de France. Chateauroux. Indre. 11/12/33 To Hs.{Lord Ernest Hives - Chair} From G.W.H. I. B. IV. RE RADIATOR SHUTTERS. We have carried out tests to find what load is necessary to keep the shutters full open from 80 to 90 M.P.H. All the tests have been taken at the end of the lever where the thermostat is coupled up to. In the first place we found that 6 1/2 lbs was necessary to pull the shutters full open, standing. With 5 lbs they would stay put, when closed slightly. Tests on the road, it was found 3 1/2 lbs pull would keep themm full open at 90 M.P.H. When partially closed a pull of 3 1/2 lbs was not quite sufficient to hold them in that position and they would close at 88 M.P.H. With 4 lbs pull the position was maintained. Therefore the thermostat must exert a force of 3 1/2 lbs at its full stroke and be capable of exerting 4 lbs three quarters of its stroke. The following sketch shows how the tests were carried out. G.H.Hancock. G.W.H. PERFECT | ||