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Increased turbulence has at least one beneficial result - improves heat transfer to pipes inside and guarantees less hot gas escapes boiler without transferring heat to freon. In fact gases from burner leave the boiler in a second or something like that; so heat exchange should be pushed to...

I was just trying to add to my previous post that I consider your analitic approach and its premises (mentioned above) in Toymaker's boiler design very positive. Sorry Toymaker for interfering your thread!

Sorry, it is off topic for Toymaker's boiler thread. I was just expressing my wonder that a not-exactly-true-to-facts model is generally used for judging IC engines. And you have pointed out one difference.

You describe it well: cake mixture.... For instance nitroglycerin mechanical output is both an effect of phase change "Detonation of nitroglycerin generates gases that would occupy more than 1,200 times the original volume at ordinary room temperature and pressure;" Nitroglycerin | Description...

Hi Steamchick, I do not have any reason to deny what you are saying, but this means Carnot approach - taken as master when comes to evaluate IC engines efficiency - is wrong. Because Carnot is a pure thermal cycle conserving mass and state of fluid (gas) in cycle; not to mention chemical...

Off course, I know forged is better than machined; copper is better than brass/ bronze; thinner, uniform walls better than thick when comes to thermal and mechanical stress. But have you thought of making radiation disk from solid, CNC machined material - meaning brass? You could dimension the...

Hi, I could be wrong, but mentioned standard might address to high volume water boilers designed for overheated liquid water- hence the low Max. pressure -below 7bar. As a side comment, monotube boilers are part of low fluid volume boilers, which are assessed in various documents as low risk...

Thank you, Toymaker! This answers to most of my questions. Happy steaming!

Hi Toymaker, I very much enjoy your design and attempt. I agree with your plan to finish first the boiler. If you accept my opinion, as a non-specialist, I believe the most problematic part in your design is the radiation disk. both on gas side because of high temperatures /radiation energy it...

Thank you very much, Toymaker and I am (will be) following you with much interest. If I am allowed to skew a bit your topic, Traian Vuia -who happens to be my fellow countryman -was one of the first to design research and promote a fast generating monotube steam boiler, starting maybe since...

Hi Toymaker. Maybe I am not the best to give advise, but my educated guess is as follows. Gas turbines are extremely hungry pieces of equipment. A small jet engine with the diameter of your turbine delivers maybe even tens of kW, so on reverse, unless you provide constant power/ gas quantities...

A very interesting concept of engine was/is free piston engine - experimented mostly in Diesel cycle - and whose most mature representative was Sigma GS-34: https://deepblue.lib.umich.edu/bitstream/handle/2027.42/107140/brandlee_1.pdf. https://www.freikolben.ch/en/roberthuber.shtml There are...

Hi Folks! This is a complete tutorial/code to build a very interesting and complex electronic indexing head: Snailworks Electronic Index Build Log I have followed it and is fully functional and easy to build. Being on MPCNC forum, one programming skilled, supportive fellow helped me modifying...

Hi Greg, I like very much your build and I appreciate much more your effort in presenting a full tutorial + plans. Though not first on my list - I'm aiming for a more basic design that could be my first 4 stroke IC motor, I consider it a straight forward. I like it, like the presentation style...

Thank you very much! I do appreciate HMEM a lot for all it offers to model engine lovers. I have learned a lot from here and much more, I have been part of making true of many personal projects!

This could be my first built engine, and I have set on a Westbury Whippet - like engine. The reason is that it is a 4 stroke (which would be a must for me) and it is a common/proven and forgiving design. It will be down-scaled and stock material built vs original. At least, this is the plan. As...

Hi, I've been a member of HMEM for about a year or so, but never presented myself. I'm 53 and I have always enjoyed thermo' engines. For me they are a combination between mechanics and thermodynamics. Thermodynamics are pure physics and mechanics (meaning concept/workshop output) are pure human...

Hi Brian. First I have to say I follow closely this thread and I enjoy both your design solution and the build. Looking at full sized engines ways of dealing with this (I'm speaking of the 3rd piston ring area), how about making radial holes in piston and maybe in the cast iron ring combined...

Hi, Kerosene flame temperature is about 2400C , steam cycle high temp is slightly above 500C. There were some industrial applications of topping cycles (many retrofit in stationary plants) based on liquid metal (mercury or other) to intermediate the difference between the 2 temperatures. there...

There are various methods to extract wasted energy from an engine both from gas pressure and thermal gradient. The recovered energy is quite low compared to already existing output. Of course I don't expect big engine manufacturers to go in all directions, considering price increase and engine...