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Old 03-20-2017, 08:09 PM   #1
EthanHopper
 
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Default 1/5 scale Bristol Centaurus

Hello I'm pretty new here and this is my first thread so pardon me if i did this wrong. But I've embarked on a new project recently and thought I'd share it and gain wisdom from some others more experienced in the hobby.

I've drawn in cad the plans for a model of an 18 cylinder double row, sleeve valve bristol centaurus radial, quite a daunting one I'm aware. The engine will not be an exact replica and is quite simplified but will have the same overall characteristics and mechanical workings. It was an engine primarily used in the british hawker sea fury fighter of WWII and is a really interesting engine. It is a standard 18 cylinder double row configuration but uses sleeve valves used in other engines like the napier sabre instead of poppet type valves.

I'm a high school student and I'm doing this as a senior double credit project that i was able to decide. I know at first thought you may think it is way out of my range and your probably right, but i do know what I'm getting into and I'm not that bothered with the nay sayers and the project is going quite well, I have a decent knowledge of engine mechanics and machining, and the fact that i made the drawings and took on the project in the first place i think shows that. I welcome your thoughts, questions or concerns. I've attached a picture of the plane, engine, the progress on the crankcase so far and rough cylinder blanks


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Hawker_Sea_Fury_WJ288_at_2009_Oshkosh_Air_Show_Flickr_3821026519.jpg   20170228_111619.jpg   20170309_095622.jpg   Bristol.centaurus.arp.750pix.jpg  
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Old 03-20-2017, 10:20 PM   #2
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Wow. That's some project. I'll be following with great interest


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Old 03-21-2017, 12:56 AM   #3
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I'll be following too. Lots of work but it can be done. Good luck!
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Old 03-21-2017, 02:50 PM   #4
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This may be of interest:

http://www.enginehistory.org/ModelEn...ol_hydra.shtml
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Old 03-22-2017, 03:06 PM   #5
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My 72 head bolts came in today and at a good time with all the cylinder blanks bored and turned (no cooling fins yet, i wanted to machine my ports first). Because of the sleeve valve design the engine is a 4 stroke but has a 2 stroke style head with no valves and only the ignition i n it, therefore it allows for very simple head fastening with 4 bolts running through the head and cylinder into the crankcase. I apologize for the sideways pictures if anyone has a fix please let me know. Thanks
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Old 03-22-2017, 06:15 PM   #6
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This is going to be cool!!!!!
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Old 03-22-2017, 07:12 PM   #7
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www.agelessengines.com/sleeve.htm

Check this one out.
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Old 03-22-2017, 08:07 PM   #8
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Thats a beautiful looking engine. It looks like a model of a bristol hercules, same company, same design, just 4 less cylinders than the centaurus. He's doing a much more exact replica to the full scale one and it looks perfect.
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Old 03-23-2017, 01:10 AM   #9
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Firstly, your engine is looking great. I'll be following along for sure.


Quote:
Originally Posted by EthanHopper View Post
I apologize for the sideways pictures if anyone has a fix please let me know.

As for your pictures, it's likely that you're using an iPhone or iPad to take them. If so, make sure the 'home' button on the device is at the bottom when you take 'portrait' pictures, or the right side when you take 'landscape' pictures. Apple products are very stubborn about the "right" way up for images they take.
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Old 03-23-2017, 06:18 AM   #10
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Thanks! I did wonder if anyone had any suggestions on parting tools for cutting cooling fins? the size of the fins were not an issue for design and won't affect any other part of the engine so they can be decided upon later. The smallest parting tools we have here at the school shop are 1/8" carbide which makes for a fairly rough and toyish look with the fin grooves being so wide, i can use a HSS tool bit ground to be a small parting tool and will likely do this for the piston ring grooves, but they tend to gum up with a long deep cut and don't handle it as well as the carbide. I'd still like for the fins to be fairly small and close to give it a closer look to full size engines but beggers can't always be choosers


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