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).
Comparison of 'Jackall' and 'D.W.S.' jacking systems, including weight, clearance, and cost.
| Identifier | ExFiles\Box 179\2\ img171 | |
| Date | 1st January 1942 | |
| -4- We have a second car (27-EX) fitted with two D.W.S. jacks to the front axle, but we are inclined to agree with the makers that two are unnecessary. Lubrication of the jacks is provided for in a very clever and efficient manner and it is claimed that they require greasing at very infrequent intervals (say once a year), lubricators are provided on them. The method of fixing to the axles is satisfactory, and can be carried out before a chassis is delivered to the coachbuilders. We understand that Barker's have adopted this system and recommend it where a four wheel system is asked for; it is a standard fitting on Rover cars and is being developed under War Office supervision in a strengthened form for armoured cars. We think it might be worth while to fit this set on to 19-EX and run them in France on the next 40/50 10,000 miles test. We certainly prefer this system to Jackall. Chief particulars of both systems are as below. Jackall D.W.S. Total weight added to front axle. 23lbs.8ozs. 15lbs. 8ozs. Total weight added to rear axle. 24lbs.4ozs. 30 lbs. Road clearance jacks) Front 6" 6.00" in closed position. ) Rear 6" 5.75" Extension of jacks. 8.50" 8.375" Clearance between tyre) Front 1.50" 1.375" and road jacks fully ) Rear 1.125" 1.80" extended. Price to us. £11. 7. 0. £6. 16. 6d. * Fitting fee. £4. 4. 0. 10/- * This figure £6.16.6d will be reduced to £5.10.3d in the event of our standardising D.W.S. jacks. HA/A.J.Lidsey. Print attached. | ||