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need iformation on old diesels

Old 01-21-2023, 07:19 PM
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In Toronto, Canada
Old 01-22-2023, 07:20 AM
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There was a suggestion here to make the backplate with 3D printing so not sure why a lathe needed. After all, it is just a plate.
Old 01-22-2023, 01:15 PM
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Originally Posted by beatsal
There was a suggestion here to make the backplate with 3D printing so not sure why a lathe needed. After all, it is just a plate.
No it's not a simple plate. It has to reduce the internal volume of the engine to a minimum to maximize crankcase compression.

I don't have a Merlin myself, but I do have a Spitfire and a ME 1cc, which are similar. I'll try and arrange a photo.

Last edited by qazimoto; 01-22-2023 at 01:45 PM.
Old 01-22-2023, 02:07 PM
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Here is a picture of a disassembled DC Spitfire (1.0cc c/w .75cc), next size up to the Merlin. It could even share the same crankcase as the Merlin. Note the complexity of the backplate.

Last edited by qazimoto; 01-22-2023 at 02:37 PM.
Old 01-22-2023, 02:43 PM
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Never imagined - My best bet (as you stated earlier) is to buy a used one if I can get it!
Old 01-22-2023, 02:55 PM
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Originally Posted by beatsal
Never imagined - My best bet (as you stated earlier) is to buy a used one if I can get it!
Online model diesel forums. This is a good one. You might try explaining what you need within a post there: There's also a good one on Facebook.

https://www.rcgroups.com/forums/show...gines/page1353
Old 01-22-2023, 02:58 PM
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This forum on Facebook is a friendly one full of helpful people.

https://www.facebook.com/groups/753859931325401
Old 01-24-2023, 01:04 PM
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Thanks. Nice link, posted about my crankcase - no reply yet
Old 01-24-2023, 01:38 PM
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Originally Posted by beatsal
Thanks. Nice link, posted about my crankcase - no reply yet
Lets be clear, you want a backplate not a crankcase. How about the screws to hold it on? Do you have them?
Old 01-24-2023, 02:34 PM
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Yes. At present my crankcase is open i.e. can see the conrod.
Old 01-24-2023, 02:34 PM
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Yes I need the screws too.
Old 01-26-2023, 07:20 AM
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No reply yet to my post asking for a crankcase cover.
Old 02-03-2023, 11:42 AM
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After all the effort and some promising replies, no useful outcome. Wonder if at the very least someone could share the drawing of the backplate for the DC Merlin - thanks.
Old 02-03-2023, 11:45 AM
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Originally Posted by beatsal
After all the effort and some promising replies, no useful outcome. Wonder if at the very least someone could share the drawing of the backplate for the DC Merlin - thanks.
I saw that Peter Valicek offered you help on FB. He's a great guy and a master machinist. Maybe you haven't seen it?
Old 02-03-2023, 12:04 PM
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I saw it and replied soon after - silence!
Old 02-03-2023, 12:39 PM
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Originally Posted by beatsal
No reply yet to my post asking for a crankcase cover.
From what I saw you asked for a "crankcase cover" and a "crankcase". What you need is called a backplate. You need to be specific. I for one don't have a DC Merlin engine to measure and sketch.

Why don't you post again?
Old 02-03-2023, 09:44 PM
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And so the pattern continues.... interesting, and frustrating at the same time.
Old 02-03-2023, 11:09 PM
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Originally Posted by 1QwkSport2.5r
And so the pattern continues.... interesting, and frustrating at the same time.
It's as if it's some sort of a Psychology Student's semester experiment :-)
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Old 02-04-2023, 07:12 AM
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Let me jump ahead and ask what the size of the screws is, you know... before it becomes an issue.
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Old 02-04-2023, 12:18 PM
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Originally Posted by Dieseltinus
Let me jump ahead and ask what the size of the screws is, you know... before it becomes an issue.
I'd guess that they'd be 8 BA. About an inch long. They would also need nuts. I'll check availability after breakfast.
Old 02-04-2023, 12:22 PM
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Thanks. Good you brtought it up as it would pose a problem later.
Not to overburden you but what model airplane kit would suit this engine
Old 02-04-2023, 01:17 PM
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E J Winters, Model Engineering suppliers have 8 BA x 1" Screws and suitable Nuts in stock. Trouble is that you have to buy a life time supply. Au$16, and Au$10 for a minimum of 50 each.

I can't remember how close the 2:56 US equivalent is. Maybe 2mm metric? I'll have to find my little book of thread specs.

The crankcase could be drilled out if necessary.
Old 02-04-2023, 02:41 PM
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Beatsal, the answer is below in the photo.
Ployd in OZ



APS Tomboy powered by a DC Merlin.
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Old 02-04-2023, 03:01 PM
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Thanks, now I will try to find where I can get an APS Tomboy kit.
Old 02-04-2023, 03:09 PM
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Originally Posted by beatsal
Thanks, now I will try to find where I can get an APS Tomboy kit.
There are lots of sources for an APS Tomboy lazer cut "kit" in Australia. However, postage may be prohibitive. It's easy to just get the plan and cut your own parts with a balsa knife.
The Tomboy plan is available free on all the online repositories.

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