The UMS 5-55 is a very reliable radial engines which uses gas as fuel. UMS has a ton of experience building radial engines.
- 5 cylinder radial configuration absolutely stunning looks and realism
- 55cc 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 bell cranks 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 87-110 octane 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) | 3.3 | 55CC |
| Bore | 0.93″ | 23.7MM |
| Stroke | 0.98″ | 25MM |
| Thrust* | 16.5lbf @ 22×8 Menz prop. | 7.5kgf @ 22×8 Menz prop. |
| Power (HP) | 3.3 | 3.3 |
| Rotation (RPM) | 1000 – 6000 | 1000 – 6000 |
| Weight | 3.7lbs | 1.8kg incl.(silencer ) |
| Engine Diameter | 8″ | 201MM |
| Engine Length | 5.4″ | 142MM |
| Propeller** | 22×8, 22*10 | 22×8, 22*10 |
| Muffler Type | Collector Ring | Collector Ring |
| Plug Type | 1/4-32 RcExl | 1/4-32 RcExl |
| Carburetor | UMS | UMS |
5-55CC 5CYLINDER TECHNICAL SPECIFICATION
Reviews (2)
2 reviews for UMS 55cc Gas – 5 Cylinder Radial 4 Stroke Engine
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Ralph Derico (verified owner) –
We have had this engine for about 3 months and have followed the break in procedures. It is on an older Green model 84″ Gee Bee model Y Sportster and our first flight today was great. Engine has run great right out of the box. Plane weight is just over 17 pounds and will well on just over 3/4 throttle. Our only complaint is that there are no instructions for mixture adjustment on the UMX carburetor. We recommend this engine to anyone that is interested in a great 50cc radial.
Ron Ables –
I bought a 1/5 scale PT 17 Stearman with a UMS 5-55 engine. I had no instruction book on the operation of the engine. I called CH IGNITATIONS and talked with Adriane. He was very helpful and directed me to the UMS web site. Fortunately for me the engine was close enough in tune that it fired right up and ran pretty good. There’s no instructions for the needle settings for the UMS carb. If you are familiar with an OS OR SAITO carbs you can figure it out. The hi and low needles were both very rich. I got the hi speed needle set and finally got the low speed set to where it would idle good. With the amount of black oil coming from the exhaust . It seems to not be broken in. I mixed a 32 to 1 oil for fuel. I’m going to run it as if it has not been broken in properly. I’m running a 21/8 XOAR prop. I haven’t tacked the rpm yet . It seems to have plenty of thrust. The sound is so good. I’m going to taxi it around for the break in period rather than tying it down .