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Author Topic: Another little project  (Read 31584 times)

boatmadman

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Re: Another little project
« Reply #75 on: July 09, 2010, 06:05:13 pm »
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Corposant

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Re: Another little project
« Reply #76 on: July 09, 2010, 07:22:48 pm »
Only a "happy boatmadman"! I would have thought you'd be ecstatic. Well done!

To a simple soul like me, it's tempting to wonder if you've got the videos the wrong way round!

Mike

P.S. I bet Ginny's pleased too!
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benjaml1

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Re: Another little project
« Reply #77 on: July 09, 2010, 11:31:02 pm »
Fine work there, congratulations ... :-))
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Drkomen86

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Re: Another little project
« Reply #78 on: July 09, 2010, 11:38:32 pm »
please tell me your joking Corposant, if I knew the refresh rate of the camera used I could give you an almost exact RPM of the engine.
the joys of GCSE Science and Media Studies  {-)
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boatmadman

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Re: Another little project
« Reply #79 on: July 10, 2010, 09:08:13 am »
Drkomen86

20 frames/sec

Ian
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Corposant

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Re: Another little project
« Reply #80 on: July 10, 2010, 10:03:27 am »
Drkomen86,

I stand corrected - well I did say I am a simple soul! Refresh rates never entered my head when admiring Ian's handiwork!

Mike
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Drkomen86

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Re: Another little project
« Reply #81 on: July 10, 2010, 10:34:23 am »
I would say between 2400-2500 Rpm (if my maths is correct)
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boatmadman

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Re: Another little project
« Reply #82 on: July 10, 2010, 10:56:26 am »
Blimey, thats fast! Its not intended for a planing hull!!

It'll go into self destruct at that speed.

Must keep the speed down, 500revs or so is the target.

Ian
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Circlip

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Re: Another little project
« Reply #83 on: July 10, 2010, 11:03:47 am »
Take note of what "Bogs" said on the "Other" forum Ian. The Collonials on the Tea party side of the pond seem to think that running Steam engines at 10,000 revs is the norm. Some are designed to run at that speed, but not a Launch type engine. run it in and go for 10PSI like the man said.

   Looks good, congrats, don't forget the displacement lurbicator.

  Regards  Ian.
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derekwarner

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Re: Another little project
« Reply #84 on: July 10, 2010, 12:58:55 pm »
Circlip........I have not read the alternate posting........but if Bogs :-)) has commented & reading the speeds involved on a steam issue ...he [bogs] would get my vote for correctness  O0 O0 O0  Derek

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boatmadman

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Re: Another little project
« Reply #85 on: July 10, 2010, 02:28:45 pm »
I have been getting advice and help along the way from Bogs - the target speed was always in the 500 revs area.

I havent forgotten the lubricator(s), they will appear in due course, as will the oil separator. But for now, I am happy watching the engine run %%.

Next step is to get engine no. 2 running.

Thanks for the comments fella's

Ian
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Corposant

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Re: Another little project
« Reply #86 on: July 10, 2010, 04:54:26 pm »
"get engine no,2 running"! Does this mean you've got the broken tap out?

Mike
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boatmadman

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Re: Another little project
« Reply #87 on: July 10, 2010, 06:23:01 pm »
Mike,

No, not yet, its still soaking in magic powder solution, but there are signs of action, I'll do as much as I can then have a go at the tap. if it fails, I will have to make a new steam chest.

Ian
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Drkomen86

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Re: Another little project
« Reply #88 on: July 10, 2010, 07:08:34 pm »
Ive redone all the maths and its looking like about 1800 Rpm so will dig out my old text books and check it  :-))
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gondolier88

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Re: Another little project
« Reply #89 on: July 10, 2010, 07:12:57 pm »
So, now the big question Ian, what are you going to do with them?

Greg
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boatmadman

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Re: Another little project
« Reply #90 on: July 11, 2010, 09:20:12 am »
Thats a good question Greg.

They are destined for a boat, and, because of the size of them, I think its going to have be an older style steam tug.

The only reservation I have about that is that all the machinery will be hidden away, which would be a bit of a shame.

I cant think of anything that would have the engines exposed that would be big enough.

Then there is the thought about size, I dont really want to have a anything over about 3ft long so as to keep it manageable.

Its a bit of a puzzle really, if any one has any ideas, suggestions, please feel free to post them.

Build of a boat for them is a while off yet, as I have the Orca to finish, then an open launch for a wobbler plant I have sitting on the shelf to do first.

I may build the plant into a working display model in the meantime.

Ian
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boatmadman

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Re: Another little project
« Reply #91 on: July 12, 2010, 12:10:13 pm »
Update on magic powder and broken taps-- It works!

The offending item has now been dissolved out of the mounting hole which means I dont have to re make the part. There is still some in the tapped hole, but thats not an issue as I think I can rotate the gland by 45 deg .

It took a while,(about a month),  but it didnt hold me up as I was working on the other engine.

Ian
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benjaml1

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Re: Another little project
« Reply #92 on: July 12, 2010, 12:11:41 pm »
Gnus... :-))
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Corposant

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Re: Another little project
« Reply #93 on: July 12, 2010, 12:30:36 pm »
Ian,

Brilliant news! We've all been waiting with bated breath!

Was there any etching of the brass?

Mike
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steamboatmodel

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Re: Another little project
« Reply #94 on: July 12, 2010, 01:50:43 pm »
Quote from: boatmadman on July 12, 2010, 12:10:13 pm
Update on magic powder and broken taps-- It works!

The offending item has now been dissolved out of the mounting hole which means I dont have to re make the part. There is still some in the tapped hole, but thats not an issue as I think I can rotate the gland by 45 deg .

It took a while,(about a month),  but it didnt hold me up as I was working on the other engine.

Ian
For those who like me could not remember what the "Magic Powder" was I looked back and on June 9/10 Ian posted
"So, next job was to drill and tap the base of the steam chests to take the spool gland, first chest drilled ok, then first tap (m2) snapped in the hole grrrrr    there is no way that is coming out, or so I thought. Then I found out that taps can be dissolved without harm to brass using a solution of aluminium potassium sulphate (alum), now awaiting delivery of the magic powder, I will update on results later."
Glad to know it works. I will have to make a note of it as other than mechanical means the only other way I knew of was EDM.
Regards,
Gerald.
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south steyne

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Re: Another little project
« Reply #95 on: July 12, 2010, 02:24:01 pm »
Nice work on the engines and having built a couple of my own one a twin cylinder oscillating and a twin cyl slide valve,i/2 in bore and 3/4 in stroke, I have often wondered if a longer stroke would benefit as it seems to me that the steam must have some time to expand and seems to me the longer stroke would allow more efficient use of the steam rather than just blow it up the funnel.
I am no engineer and have virtually no knowledge of steam expansion so maybe you guys can come up with some answers to my query as i do intend to build another engine in the near future looks like the bug has bitten
John

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boatmadman

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Re: Another little project
« Reply #96 on: July 12, 2010, 04:26:56 pm »
Mike,

The brass came out unmarked, just a quick wipe over and it was back to bright and shiny!

John,

I can recommend the plans I have used, they are aimed at people with limited machining experience and all the steps are clearly explained, along with pictures and diagrams.

ian
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gondolier88

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Re: Another little project
« Reply #97 on: July 12, 2010, 06:25:18 pm »
Quote from: boatmadman on July 11, 2010, 09:20:12 am
Thats a good question Greg.

They are destined for a boat, and, because of the size of them, I think its going to have be an older style steam tug.

The only reservation I have about that is that all the machinery will be hidden away, which would be a bit of a shame.

I cant think of anything that would have the engines exposed that would be big enough.

Then there is the thought about size, I dont really want to have a anything over about 3ft long so as to keep it manageable.

Its a bit of a puzzle really, if any one has any ideas, suggestions, please feel free to post them.

Build of a boat for them is a while off yet, as I have the Orca to finish, then an open launch for a wobbler plant I have sitting on the shelf to do first.

I may build the plant into a working display model in the meantime.

Ian

Could you do a wide beamed short launch- maybe something along the lines of a 1:7 Frolic 21? This would give a beam of about 9" off the top of my head, or you could go even smaller- the smallest boat in the SBA is HotPot- a 10ft dinghy with a small VFT boiler and little single cylinder- you could do a 1:3 model of that- lots of scope for detail?

The first pic is Hot Pot, the next two are Lady Elizabeth, one of the nicest fitted out Frolic 21's in the SBA.

Greg

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boatmadman

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Re: Another little project
« Reply #98 on: July 14, 2010, 06:09:53 pm »
Some nice ideas there Greg, thanks.

When I started on this project, I was working with the hope of 50% success rate, hence two engines. The intent was to make the mistakes on No.1 and end up with one good one plus some spare parts.

Well, today I spent fiddling with No.2 engine, and it also runs! In fact I think it runs a little better than No. 1

I havent posted any pics/video as they are identical. When I get them running together I will post a vid.

Ian

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boatmadman

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Re: Another little project
« Reply #99 on: July 16, 2010, 11:05:17 am »
Here we have both engines completed, assembled, run in on air but awaiting strip/clean before steam run.
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