Just a great all round prop. Well balanced out of the pack, efficient and plenty of speed. I use them on quads and on fixed wing models.

Will see if I can tell a big difference on the 40MM props vs 31 MM

Will see if 4 are better then 3 blades will give them a try.

Bought em cause they were not expensive at the time.

в Казань Пришли очень быстро, даже не ожидал такого. На коптер ещё не ставил, но думаю Гефман не будет плохим товаром.