In the 1930s long-distance record-breaking flights were very much in vogue, capturing the publics imagination all over the world. With the Wellesley, the RAF had an aircraft that had the potential to break the point-to-point record. The combat range of the Wellesley (with a bomb-load released at the mid-way point ) was some 1,300 miles. However, the geodetic structure of the Wellesley gave ample space for extra fuel-tanks and it was hoped that refinement in the engine would cut fuel consumption to bring the record within reach. So the RAF set up a special unit based at Upper Heyford called the Long Range Development Unit (LRDU) with a complement of five Wellesleys to explore the possibilities.
The LRDU Wellesleys were modified to carry three times the fuel of the normal Wellesley, the undercarriage being strengthened to support the extra weight. The aircraft were fitted with special Bristol Pegasus XXII "LR" engines that ran on 100 octane fuel and had their superchargers modified to give maximum fuel economy at cruising altitude. The engines were mated with new, constant speed propellers and housed in NACA cowls that were, in turn, merged to the lines of the fuselage for extra drag reduction. The aircraft also had a rudimentary autopilot fitted. These aircraft were given the Vickers type number 292.
For the attempt to break the world distance record, a route from Ismailia in Egypt to Darwin in Australia was chosen. The route went over territories that would not present any diplomatic problems and would also demonstrate Britain's ability to reinforce its assets in the Far East. The runway at Ismailia had to be lengthened to enable the heavily laden Wellesleys to take off. To save weight the crews did not take any parachutes with them, and all oxygen equipment was stripped from the aircraft. On the 5th November 1938, three Wellesleys took off from Ismailia for the attempt. Two of the aircraft landed at Darwin on the 7th November having flown the 7,175 miles from Ismailia in 48 hours 5 minutes. The third aircraft ran short of fuel and had to land on the island of Timor, but even that was still more than the existing Soviet distance record. It refuelled and quickly rejoined the other two aircraft at Darwin. This was a huge success for the RAF, featured prominently in the newsreels and newspapers of the times.
All three aircraft then did a "flag-waving" tour of Australia. Sadly two of the aircraft crashed in the course of the tour, one of these had to be abandoned where it had crashed (it was later retrieved and used as an instructional airframe by the RAAF). The other crashed Wellesley was dismantled and sent back to the UK by sea. The remaining airworthy Wellesley was also shipped by sea but to Egypt.
Source:
https://www.dingeraviation.net/wellesley/wellesley.html
I have finished the repaint depicting the aircraft with registration L2680 flown by Flt.Lt A.N. Combe. One of the 3 aircraft which flew to Darwin.
Cheers,
Huub