Optimum design paramaters

I’m looking for a calculator or a design parameter optimization tool for designing a drone, mainly focussed on higher flight time.
Currently the drone is equipped with 450 frame
frame, 1000kv motors with 30A ESC for each 1045 props and 3s 5000mAh 40C lipo battery.

Total weight of the drone (frame, propguards, landing gears, fc gps and lidar) 1800g (battery - 400g, motors+escs - 300g). Are there suggestions for improving the flight time or any tool for calculations.

Thank you

I can recommend ecalc.ch. It offers a free version with limitations on ready-to-go parameters/parts (mostly engines are valuable) but even with this, it’s usable in this form. On the other hand, a subscription costs $10 per year, so it is not terrible and gives a nice pack of ready parts.
Not sure if there is another tool like this. Hope it helps.

Been down that road. There really isn’t much you can do with a small 450mm frame. Fly it the way it is.

I have stretched a Tarot 650 Sport Quad to 700mm

I am running 17" props, 5008 335 Kv motors, 10,000 mah 6S battery. All Up Weight is 3.5 kilos. Flight time with a 20% battery capacity reserve is just over 34 minutes.

Post #3 here has a link to a flight time calculator spread sheet: Calc Spread Sheet

I should have said Read Post #3