Mercury RC Model
I finished building this model just last week and have put two flights on it so far. I built it from cad drawings I found online. It was drawn as a free flight glow powered model but I made it an Electric RC model. I also changed the all wood sheet body to stringers on the rear of the fuselage. This is a 90" span model that weights 8 pounds. The wing is built in three sections and the entire tail assembly comes off with one screw. The landing gear wires are held in place with rubber bands.
I have a question I was hoping someone may be able to help me with. The model has a RimFire 60 motor and is powered with a 5-cell 5Ah pack. First flight was with a APC 12x6 electric prop. It took off in about 20 feet but it would not climb very well. For the second flight I installed the only other prop I had with me which was an APC 15x8 electric Prop. Now the plane jumps into the air and climbs great. I mainly flew the plane as a powered glider in that I climb to altitude, shut the motor down and glide around. I also cruise it around at about 1/3 throttle but gliding is most likely what I will be doing with the model. When I landed after the second flight my 20C battery was warm, but the motor was at room temperature. Of course most of this flight was gliding so the motor was being run much. I decided to see how many amps the motor was drawing and I was shocked. The 15X8 prop draws 98 Amps and the 12X6 prop draws 48 Amps. I can live with the 48 Amps if the performance was a little better. So I guess my question is does a 48 Amp draw on a APC 12x8 electric prop seam about right? Anybody out there run a RimFire 60 and what cell count and prop do you use.