ProtoFPV PROTO4 Cinematic Racer Frame Kit.
TPU COLOR: Stealth Black.
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 TPU prints are trimmed to just what’s necessary. The carbon fiber camera cage is universal, designed to fit 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
Fame only fully built shown in photo.
Proudly designed, 3D printed, and shipped from Vancouver, British Columbia, Canada 🍁
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SPECS
Top plate: 1.5mm
Base plate: 4mm
Electronics Mounting:
Base Plate Front: M2 20x20, M2 25.5x25.5, M3 30.5x30.5
Base Plate Rear: M2 20x20 M2 25.5x25.5
Top Plate Front: M2 20x20 M2 25.5x25.5
Top Plate Rear: M2 20x20 M2 25.5x25.5
Maximum Stack Size: 40x40
Motor Mount: 9x9 and 12x12
Max prop size: 4"
Action Camera / Accessories Mounting:
Top Plate front/back use M2 nylon nut to secure screw
Rear Plate front/back use M2 nylon nut to secure screw
Battery Strap Mounting: Top mount, Toilet Tank & Undermount
Recommended Camera Mounting Size: 19mm ~ 20mm
Stand off height: 22mm
Antenna mounting size: 3~4mm Post
Frame weight: 51g (no TPU)
Top Speed: 162km/h+ (Tattu R-Line 5.0 850 6S)
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INCLUDES
T700 Carbon Fiber Plates
x1 Top plate
x1 Base plate
x1 Camera Cage Set
3D Prints
x1 Protostrap M(4S to 6S Batteries 1100mah to 1500mah)
x1 Single Antenna Mount
x1 Dual Antenna Mount Set
x1 TPU 60A Camera Dampener Set
x1 Top Light Bar
x1 Base Light Bar
x1 Action Camera Mount
x1 Feet Set (4 pc)
x1 Shark Fin with integrated nano GPS slot
x1 RX Antenna Holder Set
Hardware
Titanium M5 x 20
x1
Aluminum M5 nut
x1
m2x2 nylon nut (Aio or VTX)
x12
M2x5 nylon Stand off (VTX Spacer)
x4
Titanium M2 x 18 or M2x22 stack/aio
x4
Titanium M2 x 5 all acm and camera screw
x8
Titanium M2 x 6 cage/feet/top plate/vtx mounting
x14
Titanium M2 x 7 feet with tpu area / prop
x16
Titanium M2 x 10 bottom plate
x4
M2x22 Stand offs
x5
Zip Tie
x5
Single LED WS2812
x1
30cm length 30awg
x1
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RECOMMENDED PARTS
This frame has only been tested and tuned with the highest quality components
RECOMMENDED PARTS (Not Included)
Motors: AxisFlying 2006-2750KV Motors
Dual Personality Power: Main 6S - LR Cruise 4S
Crazy mode: 6S Tattu R-Line 5.0 850 150C XT30 (Tested: 162 km/h top speed)
Cruise mode: 18650 3000mah L-ion Battery XT30 (Tested: 85 km/h top speed, 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
4S FC: Good quality 35A AIO or mini stack with up to 4 UARTS
P4CR can also take a full 30.5x30.5 stack, but I think it's too heavy.
Props: Gemfan WinDancer 4032 Blade or equivalent
VTX / CAMERA: DJI O4 AU PRO
Receiver: TBS Crossfire nano RX w/Immortal T V2 or ELRS
GPS: GOKU GM10 Nano V3 GPSPROTO TESTING
If you plan to use 6S ensure you get a nice high performance lightweight 45A AIO or mini stack to handle the power. I've been testing my P4CR on an old 35A AIO I had on hand. (Trying to save money XD) It really doesn't like it if you push it too hard over and over again. How can you tell? The quad mometarily stalls asking you to stop. The best lipo I tested on P4CR is the Tattu R-line 5.0 850mah with xt30. I reached a top speed of 163 km/h using this lipo. I chose to use xt30 not only to save weight, but if switching to long range mode, I use a 4S 18650 Li-ion XT30. I attempted to try a 1400 mah 6S with XT60 and adapter, but I believe it could potentially create a bottle neck. Anyway, I suggest sticking with one type of connection for the quad and lipo side. Do not use any adapters. Also, I would stay away from Lihv lipos if you plan to do lots of high burst runs. Lihv lipos could sag quickly. This is what I found in my testing.
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DOWNLOADS:
Due to limited time, I have not tested any other motor configurations, or sub250g configurations, props etc. Proto4CR is a great frame to experiment with so hope you guys have fun with it! Let me know how it goes info@protofpv.com
PID & Filter Tune
*Reverse Prop Direction Recommended!
WARNING: PID and filter tune was tested only with the recommended parts list provided. The tune may not be suitable for your build and may cause fly aways upon arming! Check over all components, solder connections, and settings before your first flight, always do a test arm and low hover (less than 1 meter off the floor) to ensure no fly aways occur. We are not responsible for the loss or damage of your quad!
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