The UMS 5-100 is a very reliable radial engines which uses gas fuel. UMS has a ton of experience building radial engines. The design and construction are upper class leading to a outstanding realibility of these engines. They are easily servicebale. All critical parts are easily accesisble.
Key Features
- 5 cylinder radial configuration absolutely stunning looks and realism
- 100cc displacement perfect for scale project
- Comes complete with exhaust collector ring,spark plugs,electronic ignition, and engine mount ready to run
- User-friendly choke and throttle bellcranks included makes installation and operation easy
- Made from aluminum or bar stock where appropriate and CNC-machined accurate and repeatable specifications each and every time
- Cylinder head and crankcases produced from aircraft grade alloys
- Heavy duty double bearing crankshaft
- Billet aluminum pistons and hardened steel rings
- Hard chromed and lapped cylinder bores
- Hardened steel cams
- Burns 87-110octane gasoline with 32:1 gas/oil mixture
Specifications
| Standard | Metric | |
|---|---|---|
| Type | 4-Stroke Petrol | SPARK IGNITION |
| CYLINDER | 5 (ABC TYPE) | 5 (ABC TYPE) |
| CAPACITY (CU. IN) | 6.1 | 100CC |
| Bore | 1.10″ | 28MM |
| Stroke | 1.25″ | 32MM |
| Thrust* | 25.35lbf @ 24×10 SEP prop | 11.5kgf @ 24×10 SEP prop. |
| Power (HP) | 5.8 | 5.8 |
| Rotation (RPM) | 1000 – 5500 | 1000 – 6000 |
| Weight | 8.6lbs | 3.05kg incl.(silencer ) |
| Engine Diameter | 9.44″ | 240MM |
| Engine Length | 6.70″ | 170MM |
| Propeller** | 24×10 | 24×10 |
| Muffler Type | Collector Ring | Collector Ring |
| Plug Type | CM-6 RcExl | CM-6 RcExl |
| Carburetor | WALBRO WT-793 | WALBRO WT-793 |
Reviews (3)
3 reviews for UMS 100cc Gas – 5 Cylinder Radial 4 Stroke Engine
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Ken Dubey (verified owner) –
Third radial engine I’ve owned and the best one yet. Once thru break in and properly tuned the 5-100 starts easily and runs reliably with a broad and linear power band. Currently on a Pilot Yak 55m-88 spinning a 24 x 12 Falcon prop there’s plenty of power to perform any aerobatics the pilot is capable of. Support for the engine is top notch, just dial the # and Adrian is there to assist. This is my first UMS engine but it won’t be the last!
Tom –
I have installed the 5-100 in the 1/4 scale Phoenix Waco after the break in process. During the bench running the engine showed great promise. The Emcotech fuel pump was used at 5.5 volts. The ideal prop was a Xoar 25×12 at a bit over 4000 rpm. Idle was as low as 800 but over 1000 is most reliable. All cylinders are firing at all throttle settings. There is a slight lean zone at mid throttle. Richening the idle screw solves this. This is a true 5 hp engine and flies the big Waco with authority. Most flying is at less than 1/2 power. Full throttle on this plane is silly and grossly non scale. Huge loops are possible at 3/4 throttle. The engine is properly baffled. Using 1/32 Amsoil Dominator and 2oz/ gallon Seafoam. The engine is easy to start and so far after 15 flights, no dead stick. I would buy another 5-100.
Thomas (verified owner) –
From my previous review I stated I would buy another 5-100 and so I did! This new engine is excellent too. It turns a Fiala 26×12 prop at 5330 rpm which indicates 5.7 hp, even stronger than my other 5-100. Guys, this is a lot of power. Think of a DA60 on gear reduction. Can idle reliably at 600 rpm too. Again all cylinders firing all the time. Fuel pump was used and same fuel as before. The 5-100 is a terrific engine.