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This page was last modified on Monday, November 26, 2007
ALVIS FV 622 STALWART MK 1 1/8 SCALE This was my first radio controlled model "Scratch built" over a 2 year period (2000 hours) to plan, research, design, draw and develop which was completed in May 1991. This an exact replica of the FV622 Stalwart seen in service in 1964 with B squadron 1st Royal Tank Regiment in Germany where I served in the sixty's and have great memories, one in particular, how smooth the ride was cross- country with the 1400x 20 tyres and the sound of that B81 in full steam! FACTS Made of aluminium Alloy, weighing 40lbs (18kg) and measuring 31ins (794mm) long, 13ins (328mm) wide and 12ins (316mm) high. The model is powered by an OS 32 fan air-cooled piston engine, originally designed for model helicopters, which developes 1.35 bhp at 16,000 rpm with a centrifugal clutch, the entire transmission has been designed and built by me. The total-loss gearbox with 4 forward and 2 reverse gears is coupled by 1 layshaft to 3 differential gearboxes. The drive is then taken by 6 half-shafts to 6 fully independently coil sprung and oil- filled shock absorbed road wheels fitted with disc-brakes. This gives the model a maximum road speed of 10 mph. ELECTRICS FUTABA Challenger 6 channel, 6 volts vehicle electrics HISTORY The FV622 Alvis Stalwart was developed by Alvis as an extention of the highly successful 600 Series range of vehicles: Saracen, Saladin an Salamander. It is a high mobility load carrier (HMLC) with a load capacity of 5 tons and a towed equipment capacity of 6 tons. The Stalwart can be fitted with a 3 ton hydraulic crane, is fully amphibious and is powered by a Rolls Royce engine (B81) making a reliable, versatile vehicle capable of many tasks. The Stalwart has seen service with the British Army, has also been used by the Swedish Army and the Austrian Army because it is tough, high mobility vehicle with amphibious capabilities. CONSTRUCTION The all aluminium hull is riveted with a weld seam at the front and rear for extra strength. All aluminium material can be obtained from Ace Engineers of 
2 PB RACING PRODUCTS "MUSTANG X3" transmission parts are used. 3 The 3 differentials. note the different types of tyres. 
4 body and chassis under contruction.  5 prototype chassis fitted with "marine type gearbox" 2 forward and 2 reverse under test. 6 under power 
7 8 fitted with "cc tyres" and the new improved geabox 4 forward and 2 reverse gears, the old gearbox had too many limitations.
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10 now into the 2 year, well under way most design problems resolved.
11 the layshaft can easily be seen under the gearbox between the two chassis plates.
12 body, decking and rear air-ducting fitted. note the "packing case" on the rear deck, this allowed head room for the cylinder head.
13 14 final electrics,glass, wheel trims,wading board and brass ware fitted. the plastic wheels were later replaced with aluminium wheels.
15 ready for painting 16 meet "Ted" fancy a spin mate! 17 1st coat of primer followed 1st coat of gloss 
18 final matt coat 
19 badges painted on (later replace with brass embossed ones) and on it's own transporter, 
20 MOD specifications: to climb a gradient of no less than 20% (1 in 4) to cross a trench of no less than 5ft to climb a step of no less than 18ins. this it does and more, under test it climbed a gradient of 45% before losing traction!
21 "little and large" STALWART MK2
22 can you spot the difference? STALWART MK1
23 Stalwart mk1 been for a swim. note the lack of the "wading board" these were later withdrawn from service
24 Working design drawings, showing there age!
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