Zdenek in the Czech Republic

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Hi to all! My name is Zdeněk, I'm from the Czech Republic and I make radial model engines. I started with small displacements, the most I built were five-cylinders with a capacity of 25 cm3, now I have two nine-cylinders with a capacity of 220 cm3 under construction, but that is too much for me. I will go back to smaller cubic volumes. My engines are always four-stroke, the smaller contents are for a glow plug, the larger ones with a spark plug. The plans are big for the future, so we'll see! :)
 

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petertha

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Very nice & welcome!

It looks like several of your parts have been cast? I for one would love to see some build pictures if you feel like sharing.

Can you show more details of what I think is a starter motor (the video)?

I always have to ask this question when I see a multi-cylinder glow engine - what sort of a electrical setup do you drive the glow plugs?
 

Richard Hed

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Hi to all! My name is Zdeněk, I'm from the Czech Republic and I make radial model engines. I started with small displacements, the most I built were five-cylinders with a capacity of 25 cm3, now I have two nine-cylinders with a capacity of 220 cm3 under construction, but that is too much for me. I will go back to smaller cubic volumes. My engines are always four-stroke, the smaller contents are for a glow plug, the larger ones with a spark plug. The plans are big for the future, so we'll see! :)
Beautiful
 
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Welcome Zdenek. Those are some very nice engines. Do you make your own castings?
Hello, I don't cast anything except pistons, I mill everything. Engine designs are my own. I model them in 3D, if someone wants the drawings I would have to save them separately.
 

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Very nice & welcome!

It looks like several of your parts have been cast? I for one would love to see some build pictures if you feel like sharing.

Can you show more details of what I think is a starter motor (the video)?

I always have to ask this question when I see a multi-cylinder glow engine - what sort of a electrical setup do you drive the glow plugs?
Hello, yes I have 8 engines running till date. Nevertheless, the nine cylinder has an integrated starter, the electric motor with a diameter of 86 mm is also my product. This is followed by a freewheel and a 10:1 gear. Starts at approx. 1200 rpm.
---
The glow is electronic, the work of my friend. Works on 5, 7 and 9 cylinders. Power is from a 2S Lipol battery. It is fully automatic, the battery can be easily connected at home. Quiescent consumption is only 2 mA. After three revolutions of the propeller, the glow activates itself and glows as long as the propeller is moving. After it stops, it continues to glow for 20 seconds. If the propeller does not move by that time, it switches itself off to standby mode. The advantage is that only one candle always glows - they are connected multiplexed at a speed of 400x per second. The total consumption at full power is approx. 3A for a nine-cylinder engine.
 

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rweber

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Great work, respect!
The glow control looks quite interesting to me. Am I right, that you connect each single glowplug directly to the full Lipo2S voltage and only the short power-on time prevents that its blown away? Awesome!
 

Richard Hed

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Hello, yes I have 8 engines running till date. Nevertheless, the nine cylinder has an integrated starter, the electric motor with a diameter of 86 mm is also my product. This is followed by a freewheel and a 10:1 gear. Starts at approx. 1200 rpm.
---
The glow is electronic, the work of my friend. Works on 5, 7 and 9 cylinders. Power is from a 2S Lipol battery. It is fully automatic, the battery can be easily connected at home. Quiescent consumption is only 2 mA. After three revolutions of the propeller, the glow activates itself and glows as long as the propeller is moving. After it stops, it continues to glow for 20 seconds. If the propeller does not move by that time, it switches itself off to standby mode. The advantage is that only one candle always glows - they are connected multiplexed at a speed of 400x per second. The total consumption at full power is approx. 3A for a nine-cylinder engine.
This is really cool! I would be interested in building one of these. Is it possible to get plans?
 
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Very impressive, the cast exhaust collector ring looks especially nice, I would love to know how you did it.
It is not cast. It is milled from two halves and then welded. Finished with a jet finish.
 

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This is really cool! I would be interested in building one of these. Is it possible to get plans?
I understand your disappointment my friend. But consider: the motor is designed directly for cnc production. Many of its parts cannot be produced by conventional machining. Therefore, I do not think that the plans are of any value. It would probably just be a lot of extra work. But why not design an engine for conventional machining and provide plans for it? I will think about it!
 

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Richard Hed

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I understand your disappointment my friend. But consider: the motor is designed directly for cnc production. Many of its parts cannot be produced by conventional machining. Therefore, I do not think that the plans are of any value. It would probably just be a lot of extra work. But why not design an engine for conventional machining and provide plans for it? I will think about it!
Right. However, I was interested in the generator/alternator. HOw do you make the coils?
 

L98fiero

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I understand your disappointment my friend. But consider: the motor is designed directly for cnc production. Many of its parts cannot be produced by conventional machining. Therefore, I do not think that the plans are of any value. It would probably just be a lot of extra work. But why not design an engine for conventional machining and provide plans for it? I will think about it!
There are many on the forum that have CNC so even solid models would be useful as long as they are in one of the formats like .step or another widely used format. Even those that don't have CNC could create their own drawings from .step files.
 
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I understand and I have no doubt about it. I just wrote that cnc files are unnecessarily complicated for manual production. If someone wants to build my engine, we can somehow agree on the *.stl files.
 

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