I am making a quadcopter with a takeoff weight equal to 2 Kg. Using a thrust to weight ratio of 3:1, the required thrust per motor is 1500g. Now I am trying to calculate the vertical velocity (climb rate) which can be achieved with this thrust by the drone. When I tried to convert this gram thrust to Newton, I came across two concepts: 1) The acceleration provided by using the thrust to weight ratio is the same as gravitational acceleration, i.e. thrust/weight = m1a/m²g = 3. 2) The 'g' in propeller thrust is gram-force which can be converted by multiplying by 1000/9.81. Which of these concepts is correct or am I missing something here? And how can I use that thrust in grams to calculate the climb rate?