Main Frames
Hengist main Frames being cut out at Corus, all the dimensions were programmed into a computer which then controlled the cutting torches. Two billets were specially rolled to 1.25 ins thick to form the blank slabs.
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Main Frames
The main frames are of 1.25 in. thick plate spaced 3ft. 2.5 in. apart, the centre lines coinciding with the centre of the axlebox guide faces. The axlebox guides are welded in integrally with the frame plates and are fitted with manganese liners. The frames are well braced by vertical and horizontal stretchers and by pin jointed cross stays attached to the horn plates.
The end rear frame extension consists of two 2 in. thick slabs riveted to the main plates behind the trailing coupled wheels and carry a fabricated dragbox at the hind end. A solid drawbar transmits the tractive effort to the tender, with side intermediate buffers on the tender bearing on rubbing plates on the engine dragbox. Two of the vertical stretchers support the front of the boiler barrel and the firebox front on adjusted brass wearing liners, while the back of the firebox is carried on brackets on the rear extension frames. The side footplating is carried by brackets fixed to the boiler.
Historical Notes
Lot 242 class 6 new frame arrangement drawing incorporatates new design of cast steel frame cross stretchers with integral spring hangers as fitted to B.R class 8 and specified for all the class 7 'Pacifics' which were also cancelled. This modification prevented the frame cracking experienced on original class 7 Britannias, it also improved the ride, considered by crews who have worked 71000 to be the best. This also meant new slotting and drilling drawings had to be drawn up.
On 72000 - 9 the steam brake cylinder was supported on one of the frame stretchers, this was changed on the lot 242 Clans to include an additional cast steel support.
- L.M.S. tests showed that mileages between re-fits improved considerably when manganese steel liners fitted.
- L.M.S. 4-6-0 Class 5 without manganese steel liners, 56,969 miles between re-fits
- L.M.S. 4-6-0 Class 5 with manganese steel liners, 97,291 miles between re-fits
- L.M.S. 2-6-4 Class 4 Tank without manganese steel liners, 55,579 miles between re-fits
- L.M.S. 2-6-4 Class 4 Tank with manganese steel liners, 79,361 miles between re-fits
- E. S. Cox also noted that tyre life was also greatly improved on the engines fitted with manganese steel liners.
Held in Store
- Main frames with horn guides welded in place, all machined, ready to erect
- Horizontal stretchers
- Some intermediate vertical stretchers
- Front buffer beam, drag box, and draw gear
- Pair of round and a pair of oval buffers
- Front steps
- Front apron and foot-plating
- All grease boxes
- Rear Drag beam and associated water and brake system brackets
- Lamp irons
- Rear main frame extensions machined ready to erect
- Sand boxes
- Sand traps and ejectors
- Steam Heat valve and bag
- Vacuum bag and dolly
- Draw hook
- Coupling
- Bogie bearing pad brackets unmachined
- Pin jointed cross stay brackets unmachined
On Order
- Boiler support bracket patterns and castings
- Six Brake hanger bracket castings
Patterns Held
- Horn Guide
- Brake hanger bracket
- Bogie bearing pad brackets patterns
- Pin jointed cross stay bracket
Wish List
Money to complete frames, smokebox saddle and its captive exhaust steam blast pipe base casting, three cast steel frame bed stretchers incorporating spring hanger patterns and castings, machining, rear drag box stiffening castings and trailing truck bearers, front buffer stiffening brackets, rear drag box manganese rubbing plates, manganese horn guide liners.
Thank You
Jaymee Profiles who cut out and machined the rear frame extensions
Corus Steel, who effectively cut out the main frames for free
Copes Engineering for help, guidance and patience
Members who dug deep and paid for the work on the frames so far.
How You Can Help Build 'Hengist'
You can make a donation, you can sponsor a part or you can become an active member, for more details email: info@72010-hengist.org or write to the chairman.
'This project is made possible by your support and dedicated hard working volunteers'