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Rosebud

Locomotive grates

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Boiler Bri17/10/2015 08:49:20
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842 forum posts
199 photos

In ME4519 I found the article on rosebud grates very interesting. For me these grates are simple to make and having stainless steel in abundance is a bonus.

The only bit missing, as far as I can see is how deep to make the counterbore in order to allow the Venturi action to work correctly.

Any help please.

Brian

OldMetaller18/10/2015 07:44:08
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202 forum posts
25 photos

Like Brian, I'd like to know more about this as I'm nearly ready to make the grate for my little loco.

Regards,

John.

Diane Carney18/10/2015 09:47:01
Moderator
414 forum posts
11 photos

There has been a lot of interest in this article and I am please to say that there will soon be a follow up article that will, we hope, give more of the details you are looking for.
I also found the article thought-provking. I did have disussions in the past with another contributor on the same subject but, for copyright reasons, it was not possible to go ahead with the article as presented so it was 'grate' that it raised its head again.

It led me to thinking about the possibilities of a full size Rosebud grate for a Sentinel ... enlightened

Diane

Neil Wyatt18/10/2015 10:45:26
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Moderator
19037 forum posts
734 photos
80 articles

That pun really grates, Diane.

At least now we know that Citizen Kane was a live steamer.

Neil

IanT18/10/2015 10:56:50
1993 forum posts
212 photos

That Orson comment may go Well(s) over the heads of our younger readers Neil.

wink

IanT

Gary Wooding18/10/2015 17:37:03
983 forum posts
254 photos

They would probably admit that it sled right over.

Neil Wyatt18/10/2015 18:52:41
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Moderator
19037 forum posts
734 photos
80 articles

> That Orson comment may go Well(s) over the heads of our younger readers

Nice to know they are plural!

Neil

Boiler Bri18/10/2015 19:04:09
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842 forum posts
199 photos

tHank you for the reply Diane

Brian

RRMBK19/10/2015 13:22:57
154 forum posts
18 photos

I seem to recall someone saying they used a slocumbe centre drill from below. havent seen the article yet.

see you at track sometime.

BK.

Kevin Norman12/02/2016 16:51:00
34 forum posts
1 photos

I was also very interested in the articles in M.E.about the Rosebud grate ,nothing is gained by going to the expense of stainless steel for its construction , either M.S. or cast iron is sufficient.I have just constructed one for my Sweet Pea ,it is 4 1/2" x 4 1/4" x 1/2" MS and have drilled 156 holes on a 8mm square ,drilling from the underside first with a BS-4 centre drill to the full depth of the cone part and then completed the drilling with a 3.4mm drill which gives 11.8% of the grate area for air.I realise that with the old grate to much air was passing through and with all this excess air it wasn't burning the coal completely resulting in to much ash /unburnt products.I have taken onboard all the remarks made about rosebud grates and just wait to see if there is much improvement when running my Sweet Pea.Referring to Peter Griffiths article in M.E. 4523 he has used the grate on his Stafford with good results and the Stafford firebox is very similar to the Sweet Pea one I have.

julian atkins12/02/2016 22:45:37
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1254 forum posts
353 photos

i have some very experienced Aussie ME friends operating miniature locos where they use 'char'.

for anyone wanting to know the ins and outs of the amount of air required to burn UK coal i would suggest reading the BR Rugby Test Reports.

cheers,

julian

Bob Youldon13/02/2016 11:47:34
183 forum posts
20 photos

Good morning all,

The so called "Rosebud" grate isn't that new; recently looking through an edition of Don Young's Locomotives large and small he describes a very similar grate for his design "George" The full sized locomotives designed for Rosebud Lignite had a vast grate area in comparison to those locomotives operating on the more normal bituminous coals, I think it was a yard foreman on the Northern Pacific commenting on Rosebud lignite reckoned it needed another million years in the ground!

Regards,

Bob

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