The Pumilio Tiempo RMC is designed and manufactured in Finland. It's a rather exotic 1/6 scale shaft driven machine that uses hub center steering and is designed to be powered by a 3.5cc nitro engine, making this a fast bike for sure. Unlike other bikes currently being produced, the Pumilio Tiempo’s frame is fabricated from laser cut and polished stainless steel and the swinging arm and gearbox housings are made from CNC machined billet aluminum. All of the fasteners supplied with the bike are stainless steel. We are talking about a very durable frame designed to withstand pretty well any punishment that can be meted out by an experienced RC bike enthusiast, or an inexperienced enthusiast working their way up the control learning curve. The combination seat and tank is made from thick Lexan with the fairing being made from slightly thinner gauge material. The one thing lacking with the Pumilio Tiempo is that it doesn’t come with a rider, for me though this is amply compensated by the extremely good-looking sports style exhaust system. It’s worth noting that the rider figure included with the Thunder Tiger FM1e fits the Pumilio Tiempo quite nicely; my TT rider quite happily volunteered to have a go on a different bike! The Pumilio Tiempo, right down to the box it arrives in, comes across as an example of high tech precision engineering that manages to be both stylish and elegant. The bike looks and feels like it could have escaped right out of a BMW design studio!
Introduced at the Helsinki Hobby Show in 1999, the Pumilio Tiempo is the product of several years of research and development by keen RC’ers who also happen to be experienced 1:1 motorcycle enthusiasts. The PT’s frame is fabricated from polished stainless steel and is comprised of three pieces that bolt together to which the gearbox, engine, suspension and steering subassemblies are added to produce a very sturdy and durable machine. The quality of the supplied components is absolutely first rate; they definitely have a ‘tool-room feel’ to them. From first hand experience it has to be stated that the Pumilio Tiempo is a pleasure to build from the clear instructions provided. Every assembly step is clearly shown in the assembly instruction book. Pumilio Design even included the Allen keys required during the bikes assembly, a very thoughtful touch. Here's a couple of pictures of the bike frame under construction.
The hub center steering features two radial bearings. The whole idea behind this system is to permit the PT to lean into corners like a full sized bike. The PT’s suspension is handled very nicely by a couple of oil filled coil over shock absorbers, with ride height being easily adjusted by sliding each shock’s top connecting bolt to the desired position along adjustment notches machined into the bikes frame. The range of adjustment allows the bike to be set up to handle a variety of surfaces from normal road through to sand or dirt tracks. Unlike other RC bikes, the PT makes use of 1/8 scale buggy wheels and tires, while this may sound somewhat strange at first, this wheel and tire combo permits the PT to handle surfaces that many other RC bikes cannot. To use the lightweight buggy wheels in bike service, Pumilio Design needed to get some additional mass into the front wheel for the required gyroscopic effect. Pumilio’s answer to this was to wrap and glue a strip of lead around the inside circumference of the front wheel before fitting the foam insert and tire, a clever engineering solution.
As already explained, Pumilio Design forewent the usual chain drive method of getting power to the rear wheel and opted instead for a shaft drive system not unlike those found on full sized exotics such as BMW. The PT’s universal jointed drive shaft is securely located inside the CNC machined aluminum swinging arm which pivots on smooth acting bronze bushes. The CNC machined aluminum gearbox is a fully ball-raced dual reduction twin shaft design, incorporating hardened gears to ensure durability and trouble free operation.
The PT’s design requires the use of a rear exhaust type nitro engine (not supplied with the kit, but Pumilio Design will supply one if you ask them nicely). The major aesthetic benefit to using a rear-exhausting engine is that it allows the manifold to protrude slightly through the front of the bikes fairing for a very scale effect. The PT’s exhaust system is a thing of beauty, very sport bike, it’s almost a shame to use it in anger.
The Pumilio Tiempo does not arrive with the required 3.5cc engine, engine mounts, flywheel / clutch assembly and 14 tooth bell housing, although as stated earlier Pumilio Design is willing to supply these parts if you ask them. In my case I wanted a full kit of mechanical parts and Pumilio Design happily supplied everything required to satisfy my requirements.
The PT’s instruction book is a first class document that clearly and easily guides the constructor through the 23 step assembly process. The instructions indicate exactly which components need to be assembled with Loctite, which don’t, and which components need to be lubricated during assembly. Pumilio Design had thoughtfully pre-installed bearings and bushes, and provided a couple of Allen keys necessary for the bikes assembly. The clearly marked parts bags included extra parts … just in case they were needed. I didn’t have to file anything or fiddle about to fit the parts together. The only thing I did that wasn't mentioned in the excellent instructions involved fitting the small bevel gear (part 0204) into the rear swinging arm tube. To help with installation I put it in a ziploc bag, popped it in the freezer and about 10 minutes later the bevel gear was suitably shrunk and easily fitted into the swinging arm tube. I can honestly report that assembling the Pumilio Tiempo was a straightforward and enjoyable experience. The finished bike looks great with or without the seat/tank and fairing, it looks fast just sitting there!