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The model we are building is 1/6 scale. The wingspan is 17' and flying weight will be about 45Kg's. It will be powered by 4 x OS 40 4 stroke petrol engines spinning 3 blade 20" x 8" props. (20" diameter x 8" pitch) There are 14 servos, being controlled by an 18 channel transmitter. There is a lot of electronics involved, engine sync, rotating gun turrets, individual undercarriage control, bomb doors, etc.
It is a model of the Dam Buster plane, the bomb doors are about 1.5 metres long. The undercarriage is hydraulically operated, the main wheels are 200mm diameter. The whole plane is covered with 100 x 3mm strips of balsa. It will have a very light fibreglass covering which will be painted. We have spent about 300 hours on it so far, we want to fly it in August, so there will be a lot of hours to go. First flight will be a very nerve racking time. All up cost (without any labour cost) will be about $20,000!!!
The next project is going to be a similar sized B17 and then a big Lysander. When I get PB going I will add some of the amazing jets our members have built and fly. They are true turbine models.
Re the Merlin sound, a mob in Germany build an onboard sound system which can be programmed for any aero engine sound. It has a 40 watt amp and uses special 3" speakers. Very expensive.