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TBS Source One 7-inch FPV drone

FPV drones build for 7-inch propellers are something relatively new in a FPV commmunity. It's not that pilots were not flying with 7-inch drones. It's not that. It's rather the fact, that in last year more and more companies started to design and sell frames for 7-inch propellers, good motors and good propellers. The advantages of 7-inchers over 5-inchers are quite obvious:

Here is my favorite 7-inch Cruiser FPV drone based on Team BlackSheep Source One frame and Brotherhobby Avenger v2 2507 motors.

TBS Source One 7-inch FPV drone

One of the most popular misconceptions is that you can turn any 5" quadcopter frame into a 7" one just by adding longer arms. Yes, such a quadcopter frame will fit 7-inch propellers, but will not fly great. The reason is quite simple: vibrations. The longer the arms are, the more flexible they get and, as a result, bends more and resonates with a lower frequency. To counteract that effect, arms have to be thicker, and the whole frame more rigid and thought through. On top of that, small, designed to drive 5-inch propellers, motors (2205, 2206, 2306, and even 2207) do not have enough torque to change the rotation speed of much bigger 7-inch propellers quickly. The solution is to use much bigger motors, like 2507 or 2806.

TBS Source One 7-inch quadcopter 01

It turned out it was an excellent decision. Stiffer arms and bigger motors greatly improved flight experience, and most of the vibrations and bobbing are gone. Finally, a smooth and efficient flight...

TBS Source One 7-inch quadcopter 01

As a result, this 7-inch long-range drone has some interesting properties:

3D printed accessoriesfor TBS Source One

TBS Source One Videos

See also

Analog FPV

Analog FPV

Ritewing Mini Drak The ultimate FPV flying wing

Ritewing Mini Drak

Radios and receivers

Radios and receivers

Pirx Seven - the cruiser / long range 7-inch FPV drone

Pirx Seven