Topic: MHB Boiler and Twin Herons (Read 9761 times)

MONAHAN STEAM MODELS · « **on:** February 06, 2010, 03:37:46 am »

So here's a project that Brian Marten and myself worked on together.

The boiler is one of Brian's Seekadett boilers with a few slight modifications made to the design by myself prior to Brian building it. The lagging on the boiler was done by our client. The Heron engines are a right and left hand mirrored set. This steam plant will be powering a 6 1/2" foot scale model of the S.S. Tahoe. The hull was built from brass sheet with all the plate details and millions of rivets all soldered together. I will do my best to take some photo's of his model next time he bring it to the shop.

Bunkerbarge · « **Reply #1 on:** February 06, 2010, 03:44:17 am »

Absolutely stunning plant, I can't wait to see the model it's going to propel.

derekwarner · « **Reply #2 on:** February 06, 2010, 04:30:31 am »

mmmm. don't you just love the mirror reverse copper tube work

.......all straight & vertical & horizontal & square...an absolute credit Nick......

....Derek

Bernhard · « **Reply #3 on:** February 06, 2010, 07:49:09 am »

wooww ...

great ++++,,,,,, will it be running with 2 waterpumps,,,

>Regards Bernhard

Underpressure · « **Reply #4 on:** February 06, 2010, 08:39:55 am »

Ahhh, I just love the simplicity of steam

Neil

livesteam · « **Reply #5 on:** February 06, 2010, 08:46:45 am »

awesome!

benjaml1 · « **Reply #6 on:** February 06, 2010, 09:48:07 am »

Very impressive..

kno3 · « **Reply #7 on:** February 06, 2010, 09:58:36 am »

That's a really great plant Nick! I especially like the mirror arrangement of the engines. The idea with the angle links for the reversing mechanism is good too, I'll remember it for one of my next projects.

How much does the whole plant weigh and what are the dimensions?

I was also wondering how the inside of the boiler is, seems to have a large return flue above the lower flue that carries the burner? Are they connected at the end and do they have Galloway tubes?

MONAHAN STEAM MODELS · « **Reply #8 on:** February 07, 2010, 12:37:17 am »

Thanks guys!

Bernhard,
The steam plant is using two water pumps. The inputs and outputs are tied together with only one bypass valve on the single output line to the boiler. This makes adjusting the output much easier then trying to deal with two bypass valves. The bypass valve is on the starboard engine's pump.

Brian really did a fantastic job building the boiler. It's an impressive piece of engineering. He included both a super heater and a economizer coil or feed water heater in the upper return flue. You can see in the photos the single output line from the water pumps is plumbed right into the upper return flue (next to the sight glass) directly into the economized coil then out the forward end of the boiler into the clack valve.

Kno3,
The angled links really work nicely. I'll take some photos of a similar system I used in my steam launch "One Shot" and post them here. I'm didn't get a chance to weigh the steam plant myself but I can tell you that weight was a huge consideration for this project. The hull that it is going in is 6 1/2" feet long but very narrow for it's length. I want to say the beam is 7 inches or so? The draft is very shallow as well and despite the size of the vessel, the total displacement was very little. Since weight was a big factor, Brian's boiler was the obvious solution since they are great performers and very light weight compared to an all copper boiler. The large upper return flue does not have Galloway tubes like the lower main flue does. The upper return flue houses the super heating coil and the economizer coil. The two flues are connected internally by a single up comer.

Lochen · « **Reply #9 on:** February 07, 2010, 01:26:08 am »

Just fabulous!!

gondolier88 · « **Reply #10 on:** February 07, 2010, 02:03:44 pm »

Beautiful Nick! You now with your expertise in scale steam I must say i'm looking forward to the day you start lining your engines paintwork too...

Can't wait to see the model- was the original condensing or puffing?

Greg

kusuchi · « **Reply #11 on:** February 13, 2010, 12:20:03 am »

What an awesome plant!

Can't wait to see the launch.

mogogear · « **Reply #12 on:** February 14, 2010, 05:51:10 pm »

As all have stated- Excellent work on a "team build" ...what is Brians boielr made of if not all copper? I think I have read about the different materials before- but cannot remember!

Thanks again for sharing

andywright · « **Reply #13 on:** February 14, 2010, 06:07:15 pm »

That really is awesome, bit of a "xxxxx" to polish though.
Andy

Neil · « **Reply #14 on:** March 17, 2010, 11:38:27 am »

Can someone point me to the design of a Simpling Valve please?
I want to be able to start my triple compounds from the bank without having to wade out in the pond.
Does anyone know?
Regards.
Neil

kno3 · « **Reply #15 on:** March 18, 2010, 09:53:55 pm »

The simplest way is to connect a thin steam pipe from the HP steam chest to the MP steam chest and have the valve of your choice en route to close it when not needed.

Neil · « **Reply #16 on:** March 19, 2010, 11:21:13 am »

Thanks Kno3,
That's just what I wanted.
Much obliged.Neil

Neil · « **Reply #17 on:** March 28, 2010, 02:16:20 pm »

On second thoughts Kno3,
What is the Mp Steam Chest.
(Sorry for my tardiness, I've been in the human version of a butcher shop, (Hospital), for too long.)
Would it work on my 2 cyl and 3 cyl compounds, equally the same?
Thanks.
Neil.

kno3 · « **Reply #18 on:** March 28, 2010, 02:20:26 pm »

Neil, I understood you have a triple compound. So I meant to connect the high pressure steam chest to the second or medium pressure chest via a valve. No need to connect to the low pressure steam chest.
Should work the same on a 2 cylinder compound too.

Neil · « **Reply #19 on:** March 28, 2010, 02:38:27 pm »

Hi Kno3,

I just worked it out as you posted your reply. (I got out of bed, as I couldn't sleep anyway, to answer you.)
How stupid of me. Sorry.
Read my signature, that's not for fun. Even though I have loved steam engines most of my life, it's only now that I have time to pursue the "habit".
This forum has been a terrific help.
Thank you to all.

On another thread, I posted a request for adhesives to be below the water and to replace(?) the adhesive of plywood. Any ideas? I don't like the idea of Araldite, why, I don't know. I think I need the adhesive to "run in between the de-lamination" then clamp. Araldite will be hard to remove when it has been squeezed out.
Do you know of any other preferable material, or am I being silly?
Thanks again.
Neil

kno3 · « **Reply #20 on:** March 28, 2010, 02:41:12 pm »

Sorry, can't really help with the adhesive. Cyanoacrylate might work (super glue).

derekwarner · « **Reply #21 on:** March 29, 2010, 02:47:15 am »

Neil - "West Systems" have an epoxy resin & hardner which is designed for full size boating & wood working & works equally well with model applications

It is also thin enough to be used as an external coating for wooden hulls with or without glass woven cloth or tissue -

- Derek

Neil · « **Reply #22 on:** March 31, 2010, 08:17:22 am »

Thanks Derek.
I don't get on the pc every day. Sorry I didn't reply earlier.
Neil.

Neil · « **Reply #23 on:** March 31, 2010, 08:30:56 am »

I was wondering, after seeing so many fabulous plants, boats etc., wouldn't it be a good idea to have a "purpose made" place that members could post photos, especially photos of "really special" engines, boilers, plants, boats etc., like Nick's amazing plant above?
Just a thought. (I'll bet there is such a place, that I haven't found yet.) If not.....
Neil.

gondolier88 · « **Reply #24 on:** March 31, 2010, 09:55:37 pm »

Oh dear Neil- I suggested that ages ago and was shot down in a cloud of smoke!!!

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Author Topic: MHB Boiler and Twin Herons (Read 9761 times)

MONAHAN STEAM MODELS

Bernhard

Underpressure

livesteam

benjaml1

kno3

MONAHAN STEAM MODELS

Lochen

kusuchi

mogogear

Neil

kno3

Neil

Neil

kno3

Neil

kno3

Neil

Neil