Quick Answer
Pick your frame size first (2-inch whoop, 3.5-inch toothpick, 5-inch freestyle, or 7-inch long-range), then choose a frame type that matches your flying style. Carbon fibre, 3-5mm arms, and 30.5mm mounting holes cover 90% of builds. Start with a 5-inch freestyle frame if you are unsure.
Why Frame Choice Makes or Breaks Your Build
We have built on over 40 frame designs in our workshop. The biggest factor in how a quad flies, how easy it is to build, and how well it survives crashes is the frame, not the FC or motors. We learned this the hard way: a customer sent back a £60 "premium" frame that could not hold a tune because the arms flexed like rubber. We swapped it for a TBS Source One V6 at a third of the price and the same build immediately flew clean.
Most guides cover materials (frame materials guide) or design theory (H-frame vs X-frame). This article covers the practical decision: which frame do you actually put in your basket?
Frame Size: Start Here
Frame size (measured by propeller diagonal) determines everything. Motors, props, battery, and flying style all lock in once you pick a size.
2 to 3-inch: Whoops and Toothpicks
Micro builds for indoor and garden flying. Sub-250g, safe for tight spaces. Whoop frames with ducted props (BetaFPV Air 65/75) give protected props and quiet operation. Toothpick builds with open props are lighter and more agile but less crash-tolerant. Stack spacing is typically 25.5mm or 20mm, so check your FC fits.
5-inch: The Default Choice
What most people mean by "FPV drone." Big enough for an action camera, powerful enough for tricks, supported by every manufacturer. Start here for your first build.
Our go-to is the Axisflying Manta 5 SE V2. Squashed-X Deadcat layout keeps props out of the camera view, 30.5mm stack mounting fits standard controllers like the SpeedyBee F405 V5 stack, and the arms survive repeated concrete hits without splintering. For a premium alternative, the ImpulseRC Apex Evo 5" has the best camera cage in its price range.
7-inch and Above: Long Range
Long-range builds carry bigger batteries, GPS, and HD cameras. The AOS UL7 Evo is our pick: 7mm carbon arms, room for a 30.5mm stack plus GPS, and arm geometry tuned to reduce the low-frequency resonance that causes jello on long flights.
Arm Thickness: The Spec Most Pilots Ignore
We tested two identical builds in the workshop, one on 4mm arms and one on 5mm. The 4mm build needed 40% higher D-term to compensate for arm flex, which made the motors run noticeably hotter. For 5-inch freestyle, 5mm arms are the minimum. For 7-inch, 6-7mm. This is not a place to save weight. We see pilots spending hours on PID tuning when the real problem is arm flex.
What We Would Actually Buy
First build: Manta 5 SE V2 with SpeedyBee F405 V5 stack. Reasonable cost, easy to repair, straightforward build experience. Cinematic footage: ImpulseRC Apex Evo. Best camera cage in the price range, handles well with a GoPro on top. Long range: AOS UL7 Evo. Purpose-built for carrying weight over distance. Indoor or garden: any 65-75mm whoop frame. Fly safely under the CAA's Open A3 category without worrying about distance limits.
FAQ
Q: Does frame weight actually matter?
A: Every gram of frame weight is a gram of battery or camera you cannot carry. A 100g frame versus 130g on an identical build gives you 3-4 minutes more flight time. See our weight mistakes article for the full breakdown.
Q: Should I buy a frame kit or a bare frame?
A: First build: bare frame plus separate stack gives more flexibility and cheaper crash repairs. Frame kits save build time but lock you into specific components. Our 5-inch build guide walks through the full process.
Q: Can I reuse a frame after a crash?
A: Bent or cracked arms must be replaced immediately. A cracked arm flexes unpredictably and can cause a mid-air failure. Most popular frames sell replacement arms separately, which is one reason to choose well-known frames over obscure ones.