2mm vs 2.5mm Carbon Bottom Plate for Micro FPV

Neither thickness is automatically “better.” A 2.0 mm plate prioritizes lower mass. A 2.5 mm plate adds material and generally raises bending stiffness and impact margin, but also adds weight. The correct choice depends on the frame geometry, flying environment and how hard the quad is expected to hit things.

Plate thickness has a strong effect on bending behavior. With the same material and similar laminate, increasing thickness does more than simply add 25% more material; the section becomes substantially harder to bend. In a micro frame, that can improve resistance to arm or plate flex during crashes, but the mass penalty matters because the entire aircraft is light.

• You are minimizing dry weight.
• The frame geometry already gives the plate enough support.
• The build is performance-focused without being used as a dedicated crash basher.
• You value response and low inertia more than extra impact margin.

• You hit concrete, steel, branches or hard indoor structures regularly.
• You want more material around the motor and center-plate load paths.
• You accept a small weight increase for additional structural margin.
• You are building the same platform for a harsher use case.

The Impetus 2 is offered with both 2.0 mm and 2.5 mm bottom-plate options. The 2.5 mm plate is a stronger option, not a claim that the 2.0 mm plate is obsolete. The choice is about the intended use of the same frame.

For a micro FPV frame, choose thickness as part of the entire design instead of treating it as a spec-sheet contest. Weight, arm geometry, cutouts, carbon quality, impact environment and the rest of the build matter together.