Are you the kind of guy who looks at a pile of parts and sees a flying machine? If your garage is your sanctuary and you have been itching for a truly unique mechanical challenge, we have the perfect find for you. Located in Big Bear City and listed for $3,500, this WWII-era McCulloch 4318A Gyrocopter project is waiting for the right DIY enthusiast to finally bring it to life.
Whether you are an experienced builder or a hobbyist ready to take your mechanical skills to the skies, this is a rare chance to own a piece of aviation history and build something incredible.
The Ultimate McCulloch 4318A Gyrocopter Project
Every great garage build has a great backstory. This partial gyrocopter kit was carefully acquired from a retired aviation mechanic out in Fullerton, California. You know what that means—it has been well taken care of by a professional who truly understands vintage aircraft.
It comes with all the foundational pieces you need to get your hands dirty right away. The kit includes:
- The basic airframe to start your build
- Tow engines * One rebuilt & modified
- The Propeller system
- A solid assortment of included hardware
- A stash of extra parts and components
- A genuine McCulloch factory repair manual (copy from original archive)
Any gearhead knows that having the original factory documentation is worth its weight in gold when you are piecing together a vintage machine. It takes the guesswork out of the mechanics and gives you a clear roadmap for your build.
Powering Up with Twin McCulloch Engines
Let’s talk power. This kit doesn’t just come with one engine; it includes two McCulloch powerplants. Even better, one of these engines has already been fully rebuilt and tuned up by the previous owner to pump out a solid 78 horsepower.
If you aren’t familiar with the legendary McCulloch 4318 (also known as the O-100-1), it boasts an incredible history. These 4-cylinder, 2-stroke engines were originally designed for WWII-era military target drones. It didn’t take long for savvy aviation buffs to realize their lightweight power made them absolutely perfect for gyroplanes.
Here is what makes these engines so special:
- They produce roughly 72 horsepower at 4,100 rpm (with your rebuilt one hitting 78 hp!).
- They feature a remote-controlled carburetor for precise speed control.
- They utilize a highly reliable single-ignition system with one spark plug per cylinder.
What You Need to Know to Finish the Build
Let’s be completely transparent: this is a project, not a turnkey aircraft. Because it is a partial kit, you will need to source some additional parts and put in the elbow grease to get this bird ready for the runway. It has the major airframe components, engine, etc, and requires the guidewires, misc small parts, and connectors.
But for the serious builder, that is exactly the appeal. Half the fun of owning an experimental aircraft is knowing every single bolt, wire, and bracket because you put it there yourself. It is a fantastic opportunity to dive into custom fabrication, learn more about aerodynamics, and connect with the incredibly supportive DIY aviation community to track down those final missing pieces.
Claim Your Next Garage Obsession
For $3,500, this McCulloch 4318A Gyrocopter project offers an incredible entry point into the world of custom aviation. It has the rich history, the upgraded power, and the solid bones to become an absolute showstopper. If you have the tools, the time, and the passion for flight, this kit is ready to be your next great garage obsession.
If you’re interested in this unique WWII gyrocopter. Send an email
If you enjoyed this article, please Like, Share, and Subscribe to Little Robert’s Roadhouse for more practical tips, stories, and helpful content.
...Share your thoughts