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Scale Model Engineering Steam, gas and hot air model engines, tractors, trains and accessories. Machining and milling castings.

Scale Model Engineering

Scale Otto Langen


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  #1  
Old 11-20-2018, 07:41:55 PM
Tysher1 Tysher1 is offline
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Default Scale Otto Langen

I recently started building a model Otto Langen. After some deep searching I found some plans, all demensions were metric so I have spent sometime and converted to imperial. I have finished machining the coloum/cylinder except for milling the octogons and have a few other small parts finished. Im searching for others that have built an Otto as I have a few questions.
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  #2  
Old 11-20-2018, 08:36:19 PM
Bill Hazzard Bill Hazzard is offline
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Default Re: Scale Otto Langen

Wayne Grenning has built more of them than anyone else. I have run 3 out of the 5 original engines here in the US. What do you need to know?
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Old 11-20-2018, 09:30:14 PM
Tysher1 Tysher1 is offline
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Default Re: Scale Otto Langen

The plans I have call for 5 air intake holes of .023” diameter. I have read that others have had problems with acetylene plugging the holes after a some running time. Im starting to work on the slide valve and was wondering if anyone has tried drilling one or two large holes instead of the five smaller ones to help prevent the clogging?

Thanks for the reply
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Old 11-20-2018, 10:37:20 PM
Bill Hazzard Bill Hazzard is offline
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Default Re: Scale Otto Langen

I am not sure why the plans have 5 intake holes. The slide surface on Rough and Tumbles engine has a rectangular opening for air and just below the air are 4 holes for the fuel.
The first picture is Rough and Tumbles engine.
The second picture is engine number 7 in Munich.
The third is engine number 1360 which is a 3rd generation engine.
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Old 11-21-2018, 03:27:58 AM
JasonB JasonB is offline
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Default Re: Scale Otto Langen

If they are metric plans are they the ones by Julius DeWal? If so have a look on HMEM forum as one has been made on there that runs on propane.

His plans are based on 3rd hand Lenaz drawings, there is a good version of that engine in this thread.

All these model engines don't use flame ignition and that is why the porting is different

http://www.modelenginemaker.com/inde...ic,5919.0.html

I'm part way into a 1/4 scale one using some of the Lenaz plans and lots of alterations based on Wayne Grenning's full size replica photos.



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Old 11-21-2018, 07:03:03 AM
Tysher1 Tysher1 is offline
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Default Re: Scale Otto Langen

The plans I have are from Dewall. I have made a few changes. I will try the hole sizes that are called for and can always make another if it fails. Will your 1/4 scale use flame ignition or spark plug?
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Old 11-21-2018, 08:42:29 AM
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Default Re: Scale Otto Langen

Mine will also be spark ignition, seems one of my photos got lost from previous post so added it below.

https://img.photobucket.com/albums/v...psmcxfmxcf.jpg

This is the thread on MHEM
https://www.homemodelenginemachinist...ne-1867.30394/

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Old 11-21-2018, 10:19:49 AM
Tysher1 Tysher1 is offline
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Default Re: Scale Otto Langen

That will be very nice when complete. Is you coloum/ cylinder cast iron or did you machine out of steel and install a cast sleeve?
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Old 11-21-2018, 12:09:44 PM
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Default Re: Scale Otto Langen

I made basic patterns and had them cast, not really any cheaper in the end buy less machining









https://www.youtube.com/watch?v=N8fHs6UCr3E
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Old 11-21-2018, 10:01:18 PM
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Craig DeShong Craig DeShong is offline
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Default Re: Scale Otto Langen

Drawings weren't available when I built mine so it was pretty much hit and miss. I'll agree with all posters above. I run mine on acetylene. I have four air holes inside the valve, each about 1/8th inch in diameter. I fiddled with the size of the gas holes and settled on two holes around .025 in diameter. I have no problems with these holes getting plugged. I run the engine on around 5 psi of gas. Wayne has suggested I increase the size of the gas holes and decrease the gas pressure, his full size runs on 1/4 psi if I remember correctly. I was going to follow Wayne's suggestion but my engine runs well and I can't see messing with it more. If you have questions I'll be glad to help where i can.

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Old 01-18-2019, 11:20:14 AM
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Default Re: Scale Otto Langen

I finally got back to work on the Otto and installed the cast sleeve. The slide valve and gears are ready to go aswell. I will be milling the flats on the coloum next and getting the valve fitted. What kind of cylinder lubrication is used while running? Thanks Tyler
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Old 01-18-2019, 02:31:18 PM
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Default Re: Scale Otto Langen

The model Otto Langen Engines will be most welcome at The 2020 Otto Expo at Rollag, Minnesota
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Old 02-22-2019, 07:19:12 PM
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Default Re: Scale Otto Langen

I have most of the parts made now i just need to finish the milling on the column . I decided to make a wood pattern and pour an aluminum flywheel. I have not done much pattern making or casting so it was a bit challenging. I will post a picture of the first flywheel that didnt turn out great. I have poured a second which was much better. Iam going to finish the milling and get the slide valve mounted and start to get everything put together.
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Old 04-28-2019, 05:33:35 PM
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Default Re: Scale Otto Langen

I have slowly been getting the Otto finished. I need to finish milling the flutes in the coloum and the windows in the octogon. All other parts except a wood base (Im not much of a woodworker) are complete. Has anyone tried running one of these smaller scale Otto’s on hydrogen gas instead of acetylene? I hope to have it completed in the next few weeks and then on the fun part of trying to start it.
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Old 05-02-2019, 06:14:31 PM
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Default Re: Scale Otto Langen

I suspect hydrogen would be an acceptable fuel. Remember the by-product of hydrogen combustian is water so you might have to deal with rust. My Otto Langen, running on acetylene, will "carbon-up" after hours of running but clean up is fairly easy if you designed for disassembly for cleaning.
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