Rack for auxiliary fuel tank of Myrsky is tested
Maanantai 14.1.2019 - Member of Tuesday Club
The VL Myrsky fighter has inside both wings a rack for fastening an auxiliary fuel tank or a bomb. The Tuesday Club team had several original parts of the rack for the Myrsky restoration work. The rack parts were repaired and cleaned and assembled together to form the racks on both wings of the Myrsky and also for the short wing built for test purposes. The rack on the test wing has been already tested.
The racks had been installed on both wings on the Myrsky. The area around the rack had also been preliminarily covered with new plywood so that the rack could be tested. Holes were made into the plywood covering for the rack mounting locator pins and the catch, which the auxiliary fuel tank or the bomb is locked on. Another hole was made for the indication pin, which forwards the information to the pilot when the auxiliary fuel tank or bomb has been released.
The testing of the rack could be done easily as the wings are on the assembly jig with the lower side upwards. For the test procedure the team could use an original Myrsky auxiliary fuel tank - fortunately a bomb wasn’t needed for the testing! The team decided to test the rack on the starboard (right) wing.
The auxiliary fuel tank was lifted upside down on the wing, which was upside down on the assembly jig. The tank was placed above the rack so that the four wooden steering blocks met the mounting locator pins, which penetrated the wing covering. The lock ring on the surface of the auxiliary fuel tank slid through the hole on the wing covering towards the lock catch on the rack.
The team was annoyed to discover that the fuel tank didn’t lock on the rack. When the tank was lifted and the distance of the lock catch from the wing surface was measured, the team noticed that the rack, placed inside wing between two wing ribs, was located about 5 mm too deep. The lock ring of the auxiliary fuel tank didn’t reach the lock catch. Although the rack had been installed according to the measurements on the drawings, this was what the situation was.
The team sighed and continued working, dismantled the rack and installed it again, this time 5mm closer to the surface of the wing. The auxiliary fuel tank was tested again on its place, this time it locked perfectly on the lock catch of the rack.
Photos: Lassi Karivalo
Translation: Erja Reinikainen