Dynamo failures, brush issues, and commutator problems on the Goshawk II engine.
| Identifier | ExFiles\Box 50\5\ Scan030 | |
| Date | 25th April 1922 | |
| y4333 Extract from :- EP {G. Eric Platford - Chief Quality Engineer} 2/LG25.4.22. Re points raised by Hs {Lord Ernest Hives - Chair} & Hy. {Tom Haldenby - Plant Engineer} RE GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) II. DYNAVO FAILURES. "We found that the dynamo on 6-Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine))-II was not chargeable and on examination found the commutator smothered with dust from the Morganite brushes. The Le Carbone brushes on 4/5 Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine))-II were in excellent condition when we examined them. The Le Carbone brushes were in excellent condition and no wear hardly has taken place. I think we have gote to be very certain of our ground before departing from Le Carbone, because R is confident they are the best. They had some trouble with 5-Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine))-II dynamo not charging and the only thing we found wrong was that the spring pressing on to the brushes was fouling the nut. Re-setting the spring, so as to allow pressure on to the brushes, cured this fault." We have also experienced the faulty brush contact trouble on 7-Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine))-II at the Works, and the point has been taken up by EFC. {E. Fowler Clarke - Electrical Engineer} We feel that some alteration is required to these brush holders so as to allow full range of wear of the brushes. We also feel that longer brushes might be considered an advantage in overcoming this trouble. According to the Expl. Dept. records, there is only one Morganite brush on 6-Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine))-II dynamo which is the control brush and this brush is reduced in width so as to improve the efficiency as suggested by EFC. {E. Fowler Clarke - Electrical Engineer} and approved by R. {Sir Henry Royce} We rather feel that the Le Carbone brushes are somewhat more noisy than the Morganite and we have asked Hy. {Tom Haldenby - Plant Engineer} and Hs. {Lord Ernest Hives - Chair} to comment on such. We have also received a report from Hy. {Tom Haldenby - Plant Engineer} that the commutator on 6-Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine))-II dynamo has burst. R. {Sir Henry Royce} complains that the cover for the dynamo cannot be removed. | ||
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).