After holidays

Because of Station Development Project, new buildings are under construction, new building work had started just in front of my working place, noisy, occasional rough vibration and low frequency noise caused by big diesel motor in large heavy machinery suffer our business, not suitable for precision works. Coming across with some rare big drilling construction machinery this morning, I had a permission to take photos of them. Interesting, don't you think?

About Corona DS339MG servos, they have critical defect that would not fall flat for ordinary uses. The physical property of the case material is not adequate enough, it breaks so easily by the insulator rubber continuous tress, not applying breakable shock, naturally all the plastic stays of DS339MG servos I had exactly the same problem.
Anyway they could not be used before actual flight, how come? As the function of the servo is normal, they could be utilized in a different way of body fixing, for example, plastic tie-up band holding style with some combination of adhesive tape? Well just convenience for these equipment, 1700mm wing span high-wing model has come from my 40 years intimate friend, and it requires any motor and 3 servos, no aileron rudder and elevator only. The motor for this big yellow high-wing would be ENYA 35-4C with open locker arm constructive designing of initial production. This model airplane would be suitable for an entry to Old timer & Golden age event held every Spring and Autumn.