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Author Topic: Jerry’s second steam launch.  (Read 1169 times)

Jerry C

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Re: Jerry’s second steam launch.
« Reply #25 on: November 19, 2017, 07:20:35 AM »

Derek, I have no plan, totally winging it. Thinking of foredeck merging into sidedecks then after deck. One, maybe two bulkheads with doors. Some music, nice woods, brass and cushions. Not based on anything this time. Open to suggestions.
Rgds
Jerry.

Jerry C

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Re: Jerry’s second steam launch.
« Reply #26 on: December 04, 2017, 05:26:12 AM »




Had a bit of a break, moving house, (eldest daughter), cycling training for L’Étape Australia which I completed on Saturday. It was touch and go with the weather with floods forecast but Tour de France organisers, local authorities and police held their nerve and the event went ahead with a minor change and all had a really good event. I’ve also been acquiring tools and stuff but I’m still schooner rigged I’m afraid. Hope Father Christmas gets his finger out and brings me some more stuff. I’m also waiting for 200 tiny slotted brass countersunk screws to come from UK.
Got back onto it today.
This build has no plans or drawings, it all in my head a bit like an Arabian craftsman builds a dhow.  Today I divided the gunwales up into kind of equalise segments which just happen to be the same as the steam plant tray is wide which made the job a bit easier. I’m picturing the decks, I want camber and sheer so I’ve allowed for 2 cm of camber at the aft end of foredeck which still permits foredeck to slope towards the stern while rising in relation to foredeck gunwales. I made the main deck beam an arc of a circle that rises 2 cm to the king plank. Rough cut with Dremel router and finished on sanding station. The deck is going to be similar to “Wear” and “Wide-A-Wake” but modified to a radius at the stern to conform to the hulls canoe stern.
Jerry.

rhavrane

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Re: Jerry’s second steam launch.
« Reply #27 on: December 04, 2017, 07:50:13 AM »

Bonjour Jerry,
As you build without any plan, how did you manage to install the steam plant base ? Do you know which steam plant you will install ?
That could impact the horizontality of the hull and you woul need to ads useless ballast.
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Jerry C

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Re: Jerry’s second steam launch.
« Reply #28 on: December 04, 2017, 09:02:57 AM »

Hi, this is a link to the steam plant build. It’s a Bogstandard engine, a steam driven feed pump and a return Flue scotch boiler similar to the boiler “Patternmaker” used in his Wide-A-Wake build.




http://www.modelboatmayhem.co.uk/forum/index.php/topic,46477.0.html




Jerry.

KBIO

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Re: Jerry’s second steam launch.
« Reply #29 on: December 05, 2017, 03:39:40 PM »

Hello!
I love this launch and I take pleasure to follow up the construction.
The milling of your steam plant is very interesting Jerry. I really enjoyed to follow up.
Just for info, I built the same launch and as you did, I cut the two first clapboards.
My engine is a 23cc (old Saïto) and the boiler: 1200cc = Big & heavy!
250/300 gr/H flare Gaseous phase.
No drawing either and just ideas that I am glad to share with you.
Fanny de KBIO _ Scottish Fifties
Thanks for sharing. :-))




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KBIO

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Re: Jerry’s second steam launch.
« Reply #30 on: December 05, 2017, 03:43:51 PM »

Hello!
I love this launch and I take pleasure to follow up the construction.
The milling of your steam plant is very interesting Jerry. I really enjoyed to follow up.
Just for info, I built the same launch and as you did, I cut the two first clapboards.
My engine is a 23cc (old Saïto) and the boiler: 1200cc = Big & heavy!
250/300 gr/h burner,  Gaseous phase.
No drawing either and just ideas that I am glad to share with you.
Fanny de KBIO _ Scottish Fifties
Thanks for sharing. :-))
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Jerry C

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Re: Jerry’s second steam launch.
« Reply #31 on: December 06, 2017, 01:36:49 AM »

Hi KBIO AND Rhavane,
1st Rhavane, for the trim I will use the principals of ship stability.
I take note of the weight of the hull, w,  and find it’s longitudinal Centre of gravity, gl, by simple balance method. I measure the distance of gl from the stem post. Multiply hull weight w by gl distance gives you a moment around stem post. Each item added to the hull has a weight, w1——— n and a c of g measured also from stem post. W1——-n multiplied by distance from stem post equals it’s moment about stem post. Take the sum of every moment and divide the answer by the sum of all weights(displacement) will give you the distance of the final centre of gravity Gl from the stem. This is theory only. In practice and using my eyes I can place each major, heavy item in the hull to keep c of g where I want it. When all parts are fitted to or in the hull I can adjust Gl by sliding the steam plant metal tray either forward or aft to achieve the required trim (by the stern). Ballast will only be required to achieve the required draft which is largely determined by the size of the propeller and visual aesthetics. The major problem is that the makers of the propeller I want had a major fire and is not taking any orders at the moment.


2nd KBIO, here is a link to my first launch built from scratch using original plans.
http://www.modelboatmayhem.co.uk/forum/index.php/topic,33737.0.html


Thank you very much for your picture. I am ok with building from plans, even ok with building from pictures  but am not very good at designing myself. If you are happy for me to borrow (steal) some of your ideas, methods and solutions I would be eternally grateful to you. If you are willing then please put some more pictures up and with your help I can move along with this build. Thanks in advance,


Jerry.

KBIO

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Re: Jerry’s second steam launch.
« Reply #32 on: December 06, 2017, 12:43:37 PM »

Hello Jerry!
No problem to "steal" my ideas that I stole from someone else, anyway! {-)
I'll be very pleased to help you  (if I can) by showing some images.
I envy your real launch (and the weather)! :-))
Regards.
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