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Help Needed to Identify This 5 Cylinder Radial Engine

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Norman Blackburn 123/10/2019 15:02:44
6 forum posts
5 photos

dsc08717.jpgdsc08715.jpgdsc08714.jpgI have this 5 cylinder rotary engine which I would like to identify and obtain drawings to complete. The pistons are 0.820" dia with a stroke of 0.92 " giving, if my sums are right, about 40cc.

I have found a couple of photos on the internet but none give a name for the engine or designer. The designer could be a Richard Green , but he could have been the builder of the model. It was not clear from the Caption.

Any help would be appreciated

Norman Blackburndsc08713.jpg

JasonB23/10/2019 15:28:39
23058 forum posts
2769 photos
1 articles

Yes Richard Green Design but not sure where or if drawings are available.

one gets a mention on Model Engineering News

john feeney23/10/2019 16:25:21
26 forum posts
32 photos


I have built one of these and have the drawings somewhere, and yes it`s designed by Richard Green.

The drawing are at least 30 years so not sure how well they would copy. I found the most frustrating part was the inlet pipework. Let me know if I can be of assistance.


John Feeney

Norman Blackburn 124/10/2019 08:22:50
6 forum posts
5 photos

Thanks for your replies. I was on the right track trying to identify this engine. John, I would be most interested in getting copies of the drawings as It would give me an indication of the work remaining. The parts I have look reasonably well made and it would be a pity not to do something with them.

Do you have any photos of the completed engine that you could post?

Many thanks

Norman Blackburn

vintage engineer24/10/2019 10:05:04
259 forum posts
1 photos

Conrods look an odd design.

Edited By vintage engineer on 24/10/2019 10:05:43

Emgee24/10/2019 10:13:51
2445 forum posts
291 photos


The engine is called RADIAN , picture below of the one I built.

Check your Message Inbox on the top of page.



radian 3qtr front.jpg



Edited By Emgee on 24/10/2019 10:32:27 typos

Edited By Emgee on 24/10/2019 10:33:07

JasonB24/10/2019 10:34:08
23058 forum posts
2769 photos
1 articles

Photo from the report of the 58th ME show 88/89


Was it featured in one of the mags or did he just sell drawings direct?

Emgee24/10/2019 13:12:56
2445 forum posts
291 photos


Bought my plans direct from the designer in the early 1990's, don't recall any mag article but no doubt someone with ME and EIM indexes will correct me.


dean clarke 229/10/2019 01:40:07
166 forum posts
330 photos

If at all possible I'd like to beg, borrow, steal or buy a copy of these drawings to please.



Matthew Green 130/11/2019 21:40:45
6 forum posts

That’s my dads .

He still has some copy’s of the plans. Email me if anyone is interested

mg (at)


matt green love my dad ...


Edited By JasonB on 01/12/2019 06:52:46

Alastair Reid 120/02/2020 19:34:18
5 forum posts

Hi Folks

This engine was featured on the front cover of the February 1991 edition of "Strictly I. C". magazine. I built two of them in the nineties. Have just uploaded one running to utube and am surprised that mine seems to be the only one there as the engine deserves to be better known than it is Cant post a link here but anyone interested will find it at Radian 240 utube.

Many thank to your Dad for designing a lovely engine Matt.



EDIT. Video Added, very nice engine.



Edited By JasonB on 20/02/2020 20:14:02

Ian Skeldon 220/02/2020 21:02:37
541 forum posts
54 photos

A lovely engine Alastair, thank you Jason for adding it into the thread.

Matthew Green 120/02/2020 21:09:38
6 forum posts

Thanks for kind words. Trying to get my dad to get all his old engines Running and will do video

Matthew Green 120/02/2020 21:17:08
6 forum posts

Alistair. Did you ever get in in a plane flying ?

David Noble20/02/2020 21:47:01
328 forum posts
18 photos

Very nice job. Brilliant to see,


Steviegtr20/02/2020 22:53:27
2460 forum posts
341 photos

Wow that is superb.


Matthew Green 121/02/2020 10:59:02
6 forum posts

my dad also built a flat twin , and a side valve RC engine , hoping to do a video / maybe get them running next time i go up to see him ( April )

Circlip21/02/2020 12:41:38
1531 forum posts

To quote a Neil Diamond song "Its a beautiful noise"

Regards Ian.

Alastair Reid 121/02/2020 20:49:57
5 forum posts

Hi All

Many thanks to all for your kind compliments and to Jason for fixing the u tube link. Thnking of getting some more of my videos liinked so will try again before long...

Had intended to fly the engine in a Sopwith Pup Matt but the project remains unfinished.. So far the only homebuilt engine I've flown was a Matador 60 in a D Bodd8ngton Mannock Look forward to seeing your father engines-Hope you get the video done.

Best regards to all.


Matthew Green 124/02/2020 13:55:13
6 forum posts

sorry for the delays in replying to peoples emails, my dad only had orginals and a couple of copies , ( orginals are in A0 size) we just working out best way to put into pdf

anyway he is a couple of bad pictures of his side valve he designed / made

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