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Cox Engine of The Month
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F4D Phantom II's

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Post  andrew Mon Jun 13, 2022 11:16 pm

When you're trying to get 3 COX engines running and synced, think about these guys:

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Post  Ken Cook Tue Jun 14, 2022 7:16 pm

The title should read the need for a hearing aid. Pulse jets are obnoxiously loud and quite dangerous. It's very bad to leave them static running on the ground and it becomes quite evident as to why a few seconds after the two engines are running. They develop heat so quickly that they can split the pipe. That's when bad goes to worse. The pulse jets used in the video appear to look like newer styles opposed to a Dynajet version which is what I'm accustomed to running.

         My son Shawn was flying my buddy Dan's stunter.  Dan just prior to this run was having major difficulties getting the engine run consistent and long. He managed to do both in this video and it did indeed consume all 20 oz's of fuel in this short video. Not fast like the R/C boys hot rod but fast enough and pretty cool. 

          Hats off to Pete who was pumping the bike pump, 86 years old and still wanting to be a part of it. https://www.facebook.com/PhillyFliersCL/videos/the-pulsejet-stunter-in-action-banjock-design-powered-by-a-dynajet-pulse-engine-/858020277601441/
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Post  GallopingGhostler Wed Jun 15, 2022 12:12 am

Ken Cook wrote:My son Shawn was flying my buddy Dan's stunter.  Dan just prior to this run was having major difficulties getting the engine run consistent and long. He managed to do both in this video and it did indeed consume all 20 oz's of fuel in this short video. Not fast like the R/C boys hot rod but fast enough and pretty cool. Hats off to Pete who was pumping the bike pump, 86 years old and still wanting to be a part of it.
https://www.facebook.com/PhillyFliersCL/videos/the-pulsejet-stunter-in-action-banjock-design-powered-by-a-dynajet-pulse-engine-/858020277601441/
Fantastic video, Ken. I'd never seen a Dynajet C/L stunt before, saved a copy of the video on my hard drive. They really did a nice job on that one. And, it was nice to see the Dynajet used for more than simply speed.

Yeah, it amazes me the speed of these things for R/C. I gather that the builder went to 3 engines for enough thrust on such a large model. Other videos, I've seen single engine ones on smaller planes. They travel so fast, that they basically head down one end of the field, turn vertical until almost out of site, then back down, level the length of the flying field, then up in a squared off U shaped formation.

Haven't seen one in real life yet, so rare are their flights these days. For a time, Hobby King was selling a sort-of-Dynajet knock off. On videos I've seen them on static runs turn a cherry red, which tells me they generate tremendous amounts of heat.

Given the noise they produce is probably why they were never that popular. But, it is neat to watch the unusual pulse jet engine in flight, whether C/L or R/C.
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Post  aspeed Wed Jun 15, 2022 10:36 am

Ken Cook wrote:The title should read the need for a hearing aid. Pulse jets are obnoxiously loud and quite dangerous. It's very bad to leave them static running on the ground and it becomes quite evident as to why a few seconds after the two engines are running. They develop heat so quickly that they can split the pipe. That's when bad goes to worse. The pulse jets used in the video appear to look like newer styles opposed to a Dynajet version which is what I'm accustomed to running.

         My son Shawn was flying my buddy Dan's stunter.  Dan just prior to this run was having major difficulties getting the engine run consistent and long. He managed to do both in this video and it did indeed consume all 20 oz's of fuel in this short video. Not fast like the R/C boys hot rod but fast enough and pretty cool. 

          Hats off to Pete who was pumping the bike pump, 86 years old and still wanting to be a part of it.    https://www.facebook.com/PhillyFliersCL/videos/the-pulsejet-stunter-in-action-banjock-design-powered-by-a-dynajet-pulse-engine-/858020277601441/
I was just thinking that the jets are not really dangerous compared to a .60, but then again, I have a video that I took of Dan, flying his stunter when it crashed with the fire at the end. I have not released it anywhere because it might be embarrassing to him. Back in the 1970s I remember watching the jets in Dayton going 200 mph on nitro. They would fly very low and the sound would get very deep with a low pitch when everything was set right. I helped pit for a guy in Toronto as a kid, and it was funny when his plane was out, everyone hid behind their cars. They are very sensitive to the fuel jet diameter and kind of hard to start. It is hard to find a flying field where they are allowed to fly because of the noise.
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