Here are some pictures and details about the RVJET Double:
First flight tests were flown LOS with 900kV power packs swinging 12x6 props on two 3s1P 8Ah batteries. What a rush ! Very powerful combo and the sound of the dual props is so impressive !!
Definitely need to strengthen the center fuselage section.
Moving on to the FPV version we first added a RVPNT and 1.2GHz FPV gear and changed to the Endurance Power Packs,
6100mah 6S1P x 2
That's 4 of these batteries: https://store.rangevideo.com/products/6100mah-11-1v-2c-3s1p-lipo-battery-pack-high-energy-density
6100mah 4S2P x 2
That's 4 of these batteries: https://store.rangevideo.com/products/6100mah-14-8v-2c-4s1p-lipo-battery-pack-high-energy-density
AUW with 4S2P x 2 configuration was 4.2KG as shown - with no extra payload on-board.