World’s Fastest 50cc Motorcycle Project (2023)

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A Real Machine
Eric Manning is one of those guys who are driven to make something real and tangible. He’s a guy I know personally, and I am privileged to have the opportunity to shed some light on his recent project. I felt a formal interview would be the best way to get Eric’s ideas across and I have included the Q&A below. Now, I love a good concept rendering as much as the next guy, and virtual “what if” images certainly have their use for marketing, but I get real excited when I see an idea get built and it works as intended. In an industry full of fluff renderings and blue-sky concepts never to be built, here’s a refreshing exclusive to The Kneeslider about a genuine creator who comes from the Build it-Test it-Break it-Build it Again-Go Faster school of thought.

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What Manning has meticulously designed is a lightweight, small displacement land speed racer to be used as a test bed for maximizing efficiency of small engines and vehicle aerodynamics. This is real-world privateer development that benefits from decades of experience in building the fastest World’s Fastest 50cc Motorcycle Project (3)motorcycles on earth. You see, Eric’s ol’ man is Denis “Bub” Manning, who is no doubt a legend in motorcycle streamlining and a recent AMA Hall of Fame inductee. Bub has been chasing land speed records for close to 40 years, and his son, Eric, practically considers the Bonneville Salt Flats like a second home. When they’re not setting speed records, the father-son duo runs Bub Enterprises, which has become the #1 selling aftermarket exhaust system for Harley-Davidson motorcycles. My dad bought a set of Bub’s high-performance pipes in the early 80’s for his Yamaha 650, and they’ve kept in touch ever since. That bike is in my garage now, still sporting the original chrome Bub pipes and it runs better than ever.

Staged Development
The engine for Eric’s prototype streamliner started life in a 2002 Aprilia RS50, but has been highly modified and runs on methanol and nitrous. Manning enlisted engine builder, Richard Farmer, to whip the little 2-stroke in to shape, the same guy behind the engine development on the recent world’s fastest motorcycle, Bub’s 350mph 500hp V-4 powered streamliner. Last year, Manning’s team ran the 50cc test engine in a stock Aprilia frame, and with the help of BMW record holder Andy Sills in the saddle, they went 77.128mph to break the record in the MPS-AF class that stood for 28 years. Phase I was a success.

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The Phase II machine started life in Solidworks and was fabricated almost entirely out of laser-cut aluminum to form a lightweight, rigid truss-like structure. From what Eric tells me, the sole purpose of the Phase II machine is to dial in specific “modules” such as steering, suspension and the engine. Then, once the designs are proven, the modules will be incorporated into a completely new carbon fiber monocoque construction. This is the kind of systematic development you usually hear about in MotoGP or Formula1, but guys like Eric and his team are proving that all it takes is some good ol’ fashioned ingenuity, determination and the ability to use the tools you’ve got.

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If you have ever experienced a speed event at the Bonneville Salt Flats, then you know the type of people who run machines there. From my own experiences, I would speculate that the desolate location itself is what predisposes these gearheads to maintain a work-with-what-we-got mentality and thereby pride themselves with living in reality to make things work. There are also many factors at play at Bonneville that only add excitement to the challenge such as shifting wind, moisture, traction, heat, lunar tides, running out of beer, and so on. So, it’s not as easy as just going fast, you’re up against planet Earth, too. If you beat these odds, and walk away with that little timing slip, then you’ve accomplished something truly indescribable.

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Bonneville attracts mostly self-taught individuals and highly skilled folks who probably only keep their day jobs so they can afford to go racing. You’ll see men and women, young and old. You won’t hear a lot of “that’s how it’s always been done” or “it’ll never work”. You will hear the occasional “that just can’t be done”, though, if your machine is shaped like a brick and you just don’t have the horsepower to push it through the air. It’s a simple formula and it changes exponentially. But, if you’ve got a fancy degree and little experience, don’t go to Bonneville and tell these guys how to produce horsepower or break records.

Toys Got Bigger, More Expensive
When I first met Eric, it was in the mid 80’s during a family trip out West, and around the time Bub was running the S&S-powered streamliner he called “Tenacious”. I was 9, and I’ll never forget what it was like to see that blue streak shoot across the great white desert for the first time at 270+ mph. World’s Fastest 50cc Motorcycle Project (8)We were guests in the Manning’s Grass Valley, California home and Eric and I played and talked about cool stuff like dirt bikes, video games and blowing stuff up. I now believe that experience on the salt as a child has had a profound effect on my life. That word “tenacity” has stuck with me all along and I finally know what it means. Bonneville is a surreal place, that’s for sure. So, Eric and I are still doing the same things we were doing as kids, and that, we feel, is what happiness is all about. I know that many people talk about that, but few are lucky enough to get to do it.

So why do this? Well, I can tell you that these people take going fast very seriously. But, most importantly, it’s about having fun in the process. One thing I’ve learned about the Manning’s, is they never joke about speed or horsepower. Everything else is pretty much fair game and they are truly a joy to be around. I’m not sure if it’s the water in Grass Valley or what, but they sure know how to enjoy life!

Interview with Eric Manning:

B.Case: Your Phase I project was a stock Aprilia RS50 running a modified engine, with your Phase II creation being a complete ground-up purpose-built machine. Will the Phase III machine be an evolution of the current chassis, but with a streamlined shell to go after the absolute 50cc record of 144mph?
Eric Manning: Phase III will be a full streamliner with a carbon monocoque frame. The idea behind the transitional bike is to test and refine the steering, suspension and the engine package. I wanted to cut that development down dramatically and test each of the components separately on the Phase II motorcycle. These modules will be in the final carbon frame.

B.Case: Last year, your rider, Andy Sills, set a record with the RS50 at 77.128mph. What was it like to break a 28-year old record with your first project?
Eric Manning: It was incredible knowing that we got the record. You look in the record book and think that you have a very good shot at it, but when you factor in the wind & track conditions the odds get a lot smaller.

B.Case: Describe what it’s like to design and build a machine from scratch, and then test it on the hallowed Bonneville Salt Flats proving grounds?
Eric Manning: Bonneville is the last place in my mind for a privateer to compete. The rules are based on safety, not what sponsors of the big manufacturers agree on and that makes it very special. Innovation is not a dirty word at the salt. You can’t get banned for a good idea.

B.Case: You say this year was all about testing the new purpose-built frame and suspension. What sort of things did you learn with the new setup once you hit the salt?
Eric Manning: One of the first things was the difference in traction for handling. We had steering issues. Our bike is more of a streamliner and bit more challenging to ride at low speeds. The frame design itself was very easy to work on and maintain.

B.Case: Being that the Kneeslider readers are a fairly technical bunch, can you describe for me your design guidelines for things like weight distribution, ground clearance, rider positioning, and traction?
Eric Manning: Well the most important design challenge was the packing for Andy on the bike. Trying to get the frontal area to the bare minimum was the first goal, and then using Solidworks FEA, I was able to design the frame with a comfortable safety factor. The real bulk of the design is the packing of the sub components. That was really tough to keep it simple.

B.Case: I noticed you’ve utilized some rapid-prototyping techniques with some of your part designs. Are there other teams at Bonneville using this approach?
Eric Manning: I don’t know to what extent the other teams are using that technology, but it has sure taken a lot of the wasted time out the project. When you’re dealing with complex machine parts or castings, the RP parts can save weeks of expensive manufacturing.

B.Case: Bonneville has got to be one of the flattest, most surreal environments on Earth. As we accelerate faster and faster towards alternative vehicles, do you feel there will always be pioneers like you proving their designs out on the salt?
Eric Manning: Sure, I think that what it’s all about. To push the limits of any technology defiantly pulls in pioneers. Half the fun being at Bonneville is seeing the off the wall designs people come up with.

B.Case: Your dad told me once how a salmon inspired the extremely low-drag shape of his “Seven” streamliner. Will the same sort of aerodynamic “biomimicry” play a role in your designs?
Eric Manning: Yes, and no I’m not ready to share those designs yet. We are sponsored by Solidworks, and they have a Flow program that we are using to design our shape. We plan to head to the wind tunnel in full scale when ready.

B.Case: Now in the motorcycle hall of fame, your dad has been a pioneer in motorcycle streamlining for 35+ years. Would you say the Salt Flats are like a second home for you?
Eric Manning: There are very few times that I wasn’t at the salt. I met my wife, Delvene, at the Australian salt flats at Lake Gairdner.

B.Case: You’ve got a 7-month old baby boy named Jack, and he’s already been to the Salt Flats. No doubt, Jack is going to have some very big salt-encrusted shoes to fill. Is it safe to say that Bonneville is in your family’s blood?
Eric Manning: Yes, land speed racing is very close to my family and will continue to be.

B.Case: Where can we follow the project and find out when you’ll be testing the machine next?
Eric Manning:

Manning’s 50cc LSR Specs:
•2002 Aprilia RS 50
•Methanol Fuel with Readline Oil Premix
•Metrakit: Engine modifications (Cylinder, Piston, Crank, Primary, Reeds)
•Pingel: Nitrous Express Kit, remote starter, accessories
•Barnett Clutch
•Custom Fuel Injection with NX control
•Custom frame purposely designed for land speed racing
•Laser cut and CNC bent aluminum alloy

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All pictures supplied by Eric Manning.
Links: 50cc LSR Bub Speed Trials at Bonneville


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