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Cox Engine of The Month
September-2023
balogh's

"Beefed up old stock 290 on my Quickie100 RC after plenty of airtime hours..."



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Post  michaelherbst1 Mon Sep 18, 2023 3:07 am

Good day everybody,

I'm Michael from Germany. I am 64 years old and have been working with model diesel engines since my youth, especially Taifun engines, which I restore and anodize myself.

I am also building a Webra 4 cylinder inline engine which you can see on You Tube.

I ride and love English motorcycles. BSA B33 1951 and TRITON Pre Unit 1956.

My question:

I am currently restoring a TAPLIN TWIN 7cc boat engine. Very Happy

What thread size is used in this motor? Maybe some experts can help me.

Best regards

Michael
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Post  balogh Mon Sep 18, 2023 4:23 am

Hello Michael,

welcome to COX Engine Forum.. (I am also 64 and from Hungary, and while I am a COX engine fan, back in my youth I also ran small diesels of Hungarian MOKI and similar. Plus I also ride a small Honda MSX 125 nowadays...so you will understand this is an international young-boy site Very Happy )

I have no information about the thread sizes you ask, but you may be interested in reading this article of Spectreflight, about the engine you are working on:

http://www.sceptreflight.com/Model%20Engine%20Tests/Taplin%20Twin%207cc.html

I trust this helps, regards András from Budapest.
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Post  getback Mon Sep 18, 2023 5:24 am

Try these people https://www.model-engineer.co.uk/ and there are interest here https://adriansmodelaeroengines.com/catalog/main.php?cat_id=3 you will have to dig for it , I looked on line with no luck for specs. There are a few people here that have this engine maybe they will chime in later so check back,, Welcome to the CEF Small Cox Logo Very Happy Small Cox Logo
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Post  OVERLORD Mon Sep 18, 2023 6:25 am

It might be BA thread. Check out the article in Model Maker magazine of April 1959 on RC Library.

TAPLIN TWIN 7ccm Screen15
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Post  michaelherbst1 Mon Sep 18, 2023 6:46 am

Thank you for the answers.
It must be a BA 6 thread.
I will post photos of my engines soon.

Thanks and best regards
Michael
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Post  robot797 Mon Sep 18, 2023 11:19 am

I so hope to play with one of those one day!
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Post  michaelherbst1 Tue Sep 19, 2023 1:03 am

Good day to all model engine enthusiasts,
Attached are photos of my restored TAIFUN engines, KRATMO 10, Felgiebel Boxer 2 x 7.5 cc, which I built myself. Then the WEBRA 4 cylinder, 4 x 6.5 cc, with two 180° rotary valves, is running very well at the moment. The first run can be seen on YOUTUBE. Enter Webra 4 cylinders, or Webra 120.
More pictures will follow.

Best regards
MichaelTAPLIN TWIN 7ccm Img_2014
TAPLIN TWIN 7ccm Img_2014TAPLIN TWIN 7ccm Img_2015
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Post  Coxfledgling Tue Sep 19, 2023 2:33 am

Hi Michael,

Lovely.....

You probably make your own screws etc. But may not know of "model fixings" a mail order supplier.

I will post later the exact web address later.

Please would you post a you tube link for your engine please.

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Post  michaelherbst1 Tue Sep 19, 2023 3:53 am

Hello,
Attached is a photo of the disassembled Taplin Twin, everything looks good and usable, the pistons have good compression. The main crankshaft does not need to be disassembled as the bearings run freely and easily. The front bearing and the cylinder head screws need to be replaced, I will make them new. a good solid basis to bring the legendary engine back to life.
I'll post reports about the restoration, it'll just take a while because I'm working on a lot of other projects.
Many greetings, MichaelTAPLIN TWIN 7ccm Img_2016
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Post  getback Tue Sep 19, 2023 5:31 am

Very Nice collection you have Michael , glad the engine look good on the inside so when completed should make some air flow . Very Happy Good Day Sir Small Cox Logo
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Post  Coxfledgling Tue Sep 19, 2023 2:30 pm

Modelfixings.co.uk
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Post  michaelherbst1 Wed Sep 20, 2023 1:20 am

Good morning,
Thank you very much for the feedback and the tips.

Here is the headline for the 4 cylinder Webra on YOUTUBE:
WEBRA 4 Zylinder 160, Reihenmotor, Selbsbau RC mit 26ccm. RC model 4-cylinder in line 2-stroke

Best regards
Michael
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Post  michaelherbst1 Wed Sep 20, 2023 1:31 am

you see the KRATMO 30 selfmade 30 ccm, runs good, the Gere Engine from 1927 i build from the old plan and my first self made engine THALER Motor 9 ccm in the model Satyr runs good.

Regards MichaelTAPLIN TWIN 7ccm Img_2020
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Post  getback Wed Sep 20, 2023 5:05 am

[quote="michaelherbst1"]Good morning,
Thank you very much for the feedback and the tips.

Here is the headline for the 4 cylinder Webra on YOUTUBE:
WEBRA 4 Zylinder 160, Reihenmotor, Selbsbau RC mit 26ccm. RC model 4-cylinder in line 2-stroke

Best regards
Michael  

good morning
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Post  getback Wed Sep 20, 2023 6:35 am

You have a very nice and unusual collection of engine Michael , hope you don't mine i put your video up for easy viewing . The inline 4 cylinder engine is amazing you built and seems to run pretty good swinging a big prop . Very Happy
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Post  michaelherbst1 Mon Sep 25, 2023 1:19 am

good day everybody,
After dismantling I discovered that the ball bearings needed to be replaced.
these are the storage sizes:
Deep groove ball bearing inch R6 open
open version. without covers

Inside: 9.525mm

Outside: 22.225mm

Width: 5.558mm

greetings michael
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Post  OVERLORD Mon Sep 25, 2023 4:43 am

That's easy to calculate. You need a 7/8 x 3/8 x 7/32 bearing.
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Post  michaelherbst1 Mon Sep 25, 2023 6:56 am

I already ordered exactly yesterday.
Thank you
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