ORIGINAL: rainedave
Today a friend gave me a Cox .15. It's not a Conquest, but a throttled Medallion. I will run it tomorrow and tach it. If I feel like it's strong enough I might build a PP around it. At least it will be loud. But with today's mini servos and rx's it will be easy enough to build one very light. I've generated a set of rib patterns for a built-up wing that could be lighter than the foam cores, too.
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I used to fly a Cox Medallion .15 (unthrottled) on control line models. This was back before electric starters were around. It was one of the hardest hand starting engines I have ever owned. All of my usual tricks did nothing to get this engine to start. With today's electric starters, it will be a piece of cake, I'm sure.
I expected it to be a howler, but it wasn't. It was even with the other sport .15 engines (Fox .15X, OK Cub .14, OS and Enya .15s), so it was not a disappointment that way. Some fellows had worked out how to get it going quickly, but I never got a chance to pick their brains. I still have the unthrottled Medallion .15 in my collection. I bet you'll like yours.
It just occurred to me that I have a brand new Enya Ultra11CX ABC. If this one runs anywhere near as fast as the old AAC version, I'm sure it would make PP really honk.
If all else fails, I still have the original ST G20/15 that powered my original PP on its maiden flights. While I wouldn't call it a powerhouse, it was no slug either. I just expected more from a pylon oriented engine. Looking back on it, I probably should have shimmed the head and upped the nitro. The original G15 was set up to burn FAI fuel. Maybe that was the problem?
Ed Cregger