Thanks oyvinla for the video. Nice comparison.

(26-Aug-2016, 01:20 PM)Konrad Stepanajtys Wrote: Hey Nihal

I assume the frame you order is ZMR from FPVmodel with PDB as one of the bottom plates: http://www.fpvmodel.com/zmr250-v2-250mm-...g1005.html
It looks like this PDB has 5V regulator, since you're planning using 3s pack, you don't need anything else.

As for rest of your parts:
- lipo will be too heavy, it will behave like a school bus. Aim in something like 1300-1600mah, 1800mah as absolute max. I'd aim for 4s packs rather than 3s. You will eventually regret buying 3s packs in the future. If you're afraid of having too much power, go for lighter props like 5030 or 5040.

- motors - while those DYS are not bad of a motor, this is king of old. I'd look for something more powerful, racerstar 2205 2300kv seem to be fine and they are at similar price. But then again - DYS aren't bad motors, I fly them still on one quad and they are awesome - BUT you have to keep weight at absolute minimum and that's not something a newbie will likely accomplish, especially, that frame you chose is not the lightest one.

- 600mw transmitter - that's a lot of power. For typical short range (i mean 200 metres with obstacles and lets say 500 metres with none) flying with 200mw is enough and also generates less heat and won't interfere that much with other pilots if you come across some.

- ultrasonic module - that's fine if you just want to play with it a bit, you won't use it for very long

- prop choice is good for a larger motor (ie. 2204+), for 1806 it will be too much, but if you stay at 3s, will be fine even for those DYS.

- radio is matter of preference, however most choose Taranis and frsky modules for reliability and receivers price.

EDIT: remember that 1806 DYS have 2mm mounting holes, larger motors usually have 3mm. I don't know if you already bought the frame or not - check size of mounting holes. You can choose motor size on fpvmodel website (I see only 1806 size is available right now).

I forget to ask, if i happen to switch to 4S 1800mah, how many C should l look for?

The higher C rating you go, the less voltage sag you'll have and the more power you get out of it on the same capacity.
I'd say 45 minimum, preferably 60-65 or more.

As Mikk36 said. Also don't believe in advertised C ratings - it's often used as marketing tool. Use reliable packs like SLS (my personal favourite), SMC, Bonka, Turnigy Graphene, Tattu "75C". I'd say avoid green Turnigy nanotechs (also called puffotechs).

Those are just examples. We often just use the best packs that are available in our location, because most delivery companies reject lipos from air transport as they are dangerous goods.