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small cast iron flywheel

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geoff walker 131/05/2018 21:34:39
323 forum posts
140 photos

Hi All,

I'm looking for a small cast iron flywheel but having tried all the usual sources am unable to find what I want.

Ideally cast iron, five or six straight spokes, between 50 and 60 mm diameter with a face width of 8 to 10 mm. 75 mm diameter is too big.

Best I can find is the stuart progress flywheel at 2 1/2 " but that seems to be unavailable from them at the present time.

Reeves have a gunmetal one for the nicholas engine. This has curved spokes and would be ok but I would prefer cast iron.

Can anyone help, many thanks in advance


Chris Evans 631/05/2018 21:41:17
1476 forum posts

Take the plunge and make from solid ?

geoff walker 131/05/2018 22:16:35
323 forum posts
140 photos

Take the plunge and make from solid ?

Well that's an option Chris but lately alI I seem to be doing is sawing big lumps of cast iron, I'm sick of it mate!!!!!

No I'll make a pattern and have one cast up if I can't source one on the internet.

Still looking gents can anyone help

cheers Geoff

Brian Sweeting31/05/2018 23:48:25
378 forum posts
1 photos

Probably not ideal but have you looked at cast iron casters?

An sample here on eBay


mechman4801/06/2018 00:42:22
2451 forum posts
376 photos

... Well that's an option Chris but lately all I I seem to be doing is sawing big lumps of cast iron, I'm sick of it mate!!!!!

​... know what you mean Geoff, but Percy veer. look elsewhere for castings, I bought a couple of 4" fly wheels from RDG quite cheaply ( usual disclaimer ) & there are castings available in eBay, try car boot sales... amongst the car boots you may find something...face 20


Hopper01/06/2018 03:09:14
3699 forum posts
73 photos

PM Research in the USofA make a range of flywheel castings. Might be worth a look.

JasonB01/06/2018 07:06:24
16249 forum posts
1717 photos
1 articles

Atelier do a 50mm but due to the problems of casting thin spokes at that size in iron means they look a bit heavy.

Can always use a bit of steel tube if you want the bare rim to look like cast and just solder in some spokes and a hub which is less sawing and milling than cutting from iron bar.

Or take a Mamod one and turn down most of the rim then stick it into a "rim" or steel or iron with JBWeld

These one are soldered up, 50mm dia

Edited By JasonB on 01/06/2018 07:34:20

Journeyman01/06/2018 09:18:31
608 forum posts
93 photos

Have a look at RC Machines they may have the very "Flying Wheel" that you need.


Hopper01/06/2018 10:58:19
3699 forum posts
73 photos

Bronze do you? good price at six quid too - probably more for the shipping from US though. They also have slightly larger at 2-3/8" and aluminium option.


Edited By Hopper on 01/06/2018 10:59:53

Neil Wyatt01/06/2018 12:19:25
16562 forum posts
687 photos
75 articles

Get a suitable loco wheel and remove half the spokes

geoff walker 102/06/2018 08:12:10
323 forum posts
140 photos

Gentleman, thank you for all your replies on this post, lots of good ideas/advice.

When I finish the model, a simple oscillator I will post a picture.

Thanks again Geoff

geoff walker 112/06/2018 16:18:47
323 forum posts
140 photos

Hi All

Well I now have the flywheel I was looking for, bought from Stuart models last week.

It is the one used on the progress model and should machine down ok to my upper limit of 60mm.

It's not listed on the Stuart website on the flywheel page but is available to buy separately.

I thought it was bit expensive but having said that I'm glad I bought it last week as Stuart have just put their prices up.



geoff walker 118/09/2018 18:00:56
323 forum posts
140 photos

I need a 100mm dia flywheel for my next engine.

The one supplied by ATELIER looks more or less just what I need.

Could I ask does anyone have experience of Atelier flywheels, usual disclaimer of course.

It's not a cheap flywheel but I don't mind the cost as long as the product is good.

Any comments appreciated


geoff walker 118/12/2018 12:54:42
323 forum posts
140 photos

Hi All,

With reference to the last post, I bought a Stuart flywheel.

A little smaller at 3 1/2" but should do the job.

Not sure how to hold it for machining as there was not an extended boss in the centre.

Used the method shown below. Perhaps a bit long winded but worked well.

The plywood disc has a square shoulder turned and the diameter is a snug fit on the inner rim of the casting, tapped it on with a copper mallet up to the shoulder.




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