The Battery's are racing pack types, high C ratings, two 7.2 volts in series. (Stops voltage drop when used on high drain models.) Gear box ratio 2.5/1 Graupner Nylon sets. The brass props used are Raboesh Type 146 - 16, one R/H the other L/H. The model speed is only an estimated one. See write up on 2507 in Naval listings. (Motor: Johnson High Speed 20,000 RPM @ 12 V.) (ESC: 2 x Electonize 43HX 15 Amp) (10/10)