How to Build Proto4 Cinematic Racer | High Performance 4" FPV Drone Frame | P4CR | ProtoFPV

Proto4 Cinematic Racer (P4CR) – an all-new design, built from the ground up. This might just be the most versatile quad I’ve ever made.
Power-wise, it has a real dual personality. Throw on a 6S lipo and proper motors it rips like a laser beam. Or swap in a 4S Li-ion pack and you’re looking at solid long-range performance. My personal setup flies great on stock Betaflight PIDs — minimal tuning needed.
To keep weight down, all 47 screws included are titanium. TPU prints are trimmed to just what’s necessary. The carbon fiber camera cage can be universal but is best fitted with a DJI O3 or O4 Pro without props in view. Camera angle is adjustable up to 45°. The TPU 60A Pro camera inserts have a soft, damped feel, which helps smooth gyro signals for EIS and cuts down on jello.
The shark fin TPU helps with turtle mode and even includes a slot for a nano-sized M10 GPS (non-compass). Even tucked under TPU, I’m still pulling 20–30 satellites — no problem.
Staying true to the “cinematic racer” idea, P4CR supports four action cam zones. New for 2025: there are now four electronic mounting zones too. You can strap the battery up top or go race-style underneath. The bottom plate can hold up to three lipo straps, giving you flexibility to shift the center of gravity or run a long-range lipo that spans the frame length.
My current build isn’t sub-250g — mainly due to the motors, which are a bit beefy (over 21g each!). That said, they run cool and are perfect for aggressive 6S flying. My quad hovers around 14% throttle, just to give you an idea. But if you're chasing sub-250g, that’s totally doable with lighter 4S motors (think 14XX–18XX) and a smaller lipo. The frame itself, with standoffs, weighs just 51g — so that gives you a solid baseline.
P4CR might even make a great 3.6" build if you want to experiment in that direction.
Hope the P4CR gives you a rock-solid, flexible platform to build your dream 4" quad!
~PattyFlipz

SHOP:
https://www.protofpv.com/product-page...

RECOMMENDED PARTS
Motors:
4S sub250: 1404 ~ 1804 3000kv+
6S build: Latest Recommendation: Axis Flying C206 (2006) 2750kv or equivalent
200X/2XX4/ motors (bigger bell offers more cooling but adds weight) but carefully choose your kv wisely. Depending what you choose I wouldn't go over 3000kv.
My spec: Axis Flying 2204.5 2750kv (I think they are discontinued so you'll have to find something similar or better)
Dual Personality Power: Main 6S - LR Cruise 4S
Crazy mode: 6S Tattu R-Line 5.0 850 150C XT30 (Tested: 14% hover, 162 km/h top speed)
Cruise mode: 18650 3000mah L-ion Battery XT30 (Tested: 85 km/h top speed, 18 ~ 20 minute flight time to 2.8V per cell)
6S FC: GOKU GN 745 45A AIO AM32 (MPU6000) or any 45A AIO or mini stack with 16AWG XT30 https://flywoo.net/products/goku-gn74...
4S FC: Good quality 35A AIO or mini stack
Props: Gemfan WinDancer 4032 Blade or equivalent. T mounted props would be lighter.
VTX / CAMERA: DJI O4 AU PRO
Receiver: TBS Crossfire nano RX w/Immortal T V2 or ELRS
GPS: GOKU GM10 Nano V3 GPS https://flywoo.net/products/goku-gm10...
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Links:
Protostrap Tutorial    • How To Use Protostrap | 3D Printed Battery...  
Online Manual https://drive.google.com/file/d/1sDih...
3D Prints (Not for commercial Use)
https://drive.google.com/drive/folder...
All Photos
https://drive.google.com/drive/folder...
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