K&B Aero .18

I have one of the K&B .18 aero RC engines lying somewhere, it was a little bit of a disappointment in terms of power. I got it working alright but I haven't flown anything with it.

These engines are a remake of a Fuji/Toki engine, which in turn where a cheaper version of a HPI engine (as I have understood it). The HPI engine was true ABC, with a bushed aluminium conrod etc. The Fuji and K&B are instead ABN with a brass/bronze rod, similar to the Fuji .05 engine. The .18 and the .05 also share a common carb (!) but the bore in the barrel is smaller on the .05 engine. On the .18 engine there is a restriction below the throttel barrel in the carb (which can easily be removed), I don't know anything about the size of the CL ventury though.

I had a thread on RCU at the time: K&B .18 thread

In short, the engine didn't run well on the supplied exhaust (same as ASP .15 by the looks of it) but it will run fine with a less restrictive exhaust and smallish props. On a 7x4 prop it would then match a stock ASP .15XLS engine (i.e. about 20krpm). So if you think of a the K&B .18 as a regular .15 engine, it will be fine. It is only slightly heavier than a typical .15BB engine, here are some numbers (engine only, and with RC carbs) all providing about the same power:

K&B .18 Aero RC: 176g
MDS .18 RC: 172g
ASP .15 XLS: 168g
OS .15 FP (the LA is similar too): 140g