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Merryweather Steam Fire King self propelled

this is the story of my freelance constructed fire king

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Werner Schleidt01/03/2019 10:38:54
97 forum posts
146 photos

Hallo Duncan,

I am lazy with drawings normaly I made the most on the fly out of my brain. I send you an article from a german

publication by PM.


Howard Lewis01/03/2019 11:42:52
3272 forum posts
2 photos


A splendid account of the work that you have done, and the problems that you have overcome, to make such a marvellous model.

We enjoy reading your reports and seeing the videos.

I am in awe of you!


Werner Schleidt17/03/2019 17:19:47
97 forum posts
146 photos

Hello all ,

many thanks for your comments.

The last thing I add after the winter season is a new name plate. On an old photo it is visible that the fire king was christening to the name Dreadnought.

So I add this for the new steam season.


The firemen and I are waiting eagerly to come out of the basement to be in the new steam season.


Werner Schleidt05/05/2019 12:33:38
97 forum posts
146 photos

Hello all ,

on a nice easter sunday I made a test ride with my fire king to see how the turbulator work.

Last year in october I saw the performance and made the subjectiv rating that it is a remarkable improvement.

The added turbulator in the center flue tube.


This time I added measurement equipment to see the exhaust temperature, the pulling force and the speed.

I recorded this by my own software via bluetooth with a smartphone.

Test drive.jpg

test equipment 1.jpg

test equipment 2.jpg

total drive.jpg

The colours are green the pulling force max 200 N, red the sppeed max 8 Km/h, violet the exhaust emperaturemax 350 °C, the calculatet distance in grey max 1500 m and blue the calculated power max 100 W

To show the measurement more in detail I devided it in parts. And marked the parts in a road map.


The fllowing diagrams are related to the parts marked in the map.

part 1.jpg

The ride over the pedestrian way into the street there was a peak force of 180 N . In 2 the journey starts.

The violet down peaks are related to the cold steam engine and a high waterlevel.

part 2.jpg

At Position 2 I filled the grate with coal nearly to the fire door. And then I start driving. In 3 I had to look to traffic and slow down a little. And then I was in full motion the boiler had lots of power an nearly constant 330 °C exhaust temperature and I was able to hold the speed legal speed of 6 km/h.

part 3.jpg

The same I made at position 2 I filled the boiler grate with coal and looked to the oil pump.

part 4.jpg

In 3 on my way back home I had to wait and made a traffic related stop. On my way the safety valve blew very often and I tried to pump water to come down with the pressure. I drove the round as fast as possible to see what happens.

smoke box.jpg

With this fast driving there is not much unbourned coal int the smokebox. With a vaccum cleaner it was an easy job to clean.



For me it was a great success to see how the fire king performs now. There were some little drawbacks . I forgot to weight the coal ,it was about 3 Kg and 14 liter water. The powersupply of my measurement equipment was only good for one round. The wiring of the sensors to the recorder have to be improved.

best regards


Werner Schleidt06/10/2019 15:40:43
97 forum posts
146 photos

Hello all,

thanks for more then 10000 views on my disriptions here. I had never thought that there is so much interest.

I had many projects ongoing this year. One Item was the poor behavior of my donkey pump. In connection with the displacement oiler the pump has to less or to much oil. And so was the behaviour of the pump. I decided to build a mechanical pump. It was very tricky to put it in function ,but now after 3 Steps the system work fine.

In September we had our club steam days with insider and the public. It was two days of fun. I made a Video for documentation.

I hope you can enjoy it.

best regards


Jon Lawes06/10/2019 16:20:50
371 forum posts

Thank you Werner, very interesting.

Jon Lawes06/10/2019 16:20:51
371 forum posts

Thank you Werner, very interesting.

Werner Schleidt25/12/2019 13:37:18
97 forum posts
146 photos

Hello all,

there is a video of our steam off at our club area end of october.

It was cold and rainy ,but we had lot of fun.

with christmas greetings
The Fireking has now a cleaning session and get some small repairs and polishing of all brass parts.
And some repair paint on small points.

Edited By Werner Schleidt on 25/12/2019 13:37:56

V8Eng25/12/2019 23:26:57
1433 forum posts
28 photos

That looks very good fun and your Merryweather engine runs well and sounds really nice.

Thanks for keeping us updated.

Merry Christmas.

Werner Schleidt21/05/2020 16:50:47
97 forum posts
146 photos

In this difficult times we had a big delay to our first steam up.

After they softened the restrictions in Germany for meetings with the allowance of two different persons of different households, my friend and I decided to make a steam rally for two.

We had a lot of fun . We made both some optimisations. I made a new widended up blast nozzle. The engine runs now more freely at higher speeds and the fire and pressure behaviour is good.

I hope you can enjoy the video.

best regards
David George 122/05/2020 07:09:04
1223 forum posts
415 photos

Hi Werner nice to see you still safe and your magical engine still working.


Werner Schleidt03/06/2020 13:23:17
97 forum posts
146 photos

Hi folks,

i have an update .

I had a dream to make in our area a longer trip to our next town on field and bicycle roads . On Pentecoste Monday there was good wheather and the forecast for the end of the week getting worst.

So I decided that my dream have to come true. To have a clear unterstanding of the road conditions I drove the ways at first by bicycle. For a backup I drove my car to the next town and with bike back.

Then the steam rally for one had a go. It was the longest trip I ever made with the fire king. I had on a second car coal and water and equipment to start the fire again with me. I gave it a start and drove on field and bicycle roads to the next town about 4.8 Km . There were some steep parts over some dams of the river rhine. After the first one I remember that i have first and second gear. To get water in the boiler was no problem ,but under full speed driving i was so enthusiastic that I forgot sometimes to add coal to the fire. So I had some passages to drive whith low pressure of 3 bar. The scenerie was nice and the fire king run to Ginsheim like a swiss watch.

My dream was to have an ice was canceled as I see the long waiting line. By chance I met some friends from our club and had some small talk. Then I drove at bicycle roads back to home. Under driving i saw that some water came out of the stuffing nut of the water pump. I had twice times to tighten it under my way. All systems were in good condition.The last 300 m to home I had problems with the fire I was only able to hold 3 bar. The driver was hungry and thursty at home. It was a great tour and I drove in total 11 Km. The trip lasted 4 hour. My knowledge before was 2.3 and 3.5 km at our club area what a difference

On the whole trip I need 4,3 Kg of coal and 50 L of water i had with the pause with small talk an average speed of 2,75 Km/h top speed was 6.3- 6.5 km/h. I made a video of this trip.

I have now the joy to clean all parts. I changed over the winter the blastnozzle to get less back pressure and less fire draught. The result was very good only particles like sand are in the smoke box. At the grate I had some clinker, I think they came from not continous coal adding.

I hope you can enjoy the video as I .


David George 103/06/2020 13:35:09
1223 forum posts
415 photos

Absolutely magic. It shows what a well made scale model can do.


Werner Schleidt06/06/2020 14:08:06
97 forum posts
146 photos

After cleaning and serviceing the water pump of the right side had a complete worn in stuff box material.

I had to repack it, that was the only service and cleaning I had to do.

I made a picture of the smoke box area. There was very less material after this long run. It was like grey and black sand.

The widen up of the nozzle as it was  identifyed in my measurements last year, was the right decision!


the grate


The grate had some clinker as rocks and some other loose material.

My questions is , if I was able to fire more constant , was it possible to avoid this?

Or is it normal after such a run of that lenght of driving ?

Thanks to all who are interestet in my work.


Edited By Werner Schleidt on 06/06/2020 14:13:49

Werner Schleidt11/06/2020 07:56:35
97 forum posts
146 photos

Hi folks ,

with the lack of steam rallies the street steamers , at the DBC Rhein-Main club track , decide to make their own

rally. So we have a nice day out and made a Steam Rally for four.

This time we had a helping hand for the camera and so I had the luck to be on the video, too.

We had all a lot of fun . The lunch brake was made like the engine driver have done it with sausages heated in foil made of aluminium in the smoke box.


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