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Building Tips and technical articles. => 1/2 A building. => Topic started by: Mark Mc on October 17, 2020, 09:12:56 PM
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Here. Hold my beer.
In thread over on the CEF, one of the members posted a picture of an imitation inline twin .049 engine on an eBay auction. It looked more like a faux pas than a faux twin. So, after looking at the pictures on the eBay listing, all I could say is, “Here. Hold my beer!”
https://youtu.be/BVAr81nY3cE
It should only take about an hour to get the metering fixed like I want it. After it’s fixed, it’ll be ready to install in a plane. I didn’t bring out my tach, but it’s screaming quite well. Should have no problem pulling a plane through the maneuvers. I already know what I’m going to build for a plane, so stand by. I have a whole six pack.
Mark
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That's a Tri-fuel motor. Pretty common around here. Front cylinder is glow and acts like a pony motor on a CAT. Rear cylinder is diesel, which is why he keeps diddling with the compression to get it to fire. Notice that the diesel runs hot--he burned his fingers. The third fuel is the beer, with real high alcohol content to keep the flippy activity going, over and over and over, regardless of the needle setting.
The reason the glowhead on the pony cylinder burned out is because he's got a fuel leak between the cases. Ether is death on the hot platinum element.
The prop is yellow, and has the safety tips because after running CATs for a lifetime, that's the kind of thing you're used to.
The Divot
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Pretty cool Mark.
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What prop is he running? Rpm? Fuel? How are the cylinders linked? They must be in tandem or the case pressure wouldn’t suck fuel. But how does he stabilize that long a crankpin?
Cool project!
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I watched the video a few times. Looks to me like only the front cylinder is functional? Appears the back one is a clever disguise of the needle and venturi? Thoughts?
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What prop is he running? Rpm? Fuel? How are the cylinders linked? They must be in tandem or the case pressure wouldn’t suck fuel. But how does he stabilize that long a crankpin?
Cool project!
It's running a Cox 5x3 rubber ducky. I forgot to get out my tach, so I don't have an accurate speed. From the sound, I'd guess around 16K. Here's how I did it:
https://www.coxengineforum.com/t14510-here-hold-my-beer (https://www.coxengineforum.com/t14510-here-hold-my-beer)
Mark
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Everyone needs to go back and re-read Marks original post where he describes the engine as an "imitation". Rear one is just for looks folks. ;D
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Okay. I finally got around to building a plane for this. No name for the plane yet. But I also wanted to try making a flapped sheet wing plane, so this is two first flights in one. The balloon tank is a 9” party balloon. It’s filled up about half full. That got a 9 minute and 45 second run. On the way home I stopped at WalMart and got a bag of 7” balloons, and that’s only because they didn’t have 5” party balloons… Ah, well. They’re only 99 cents for the bag of 30 balloons. I can always use the 9” balloons for the Medallion .15 on my SIG Acromaster.
https://youtu.be/zUV-GkCJvgM (https://youtu.be/zUV-GkCJvgM)
Mark
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Is that the Joe Gilbert doing the pilot work? Also looks like Gluedobbers field from the looks of how circle is mowed. Sure miss going down there. Also if it is Joe surprised he didn't put it through the stunt pattern. D>K