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Author Topic: Calmac Island Class Ferry - Rhum  (Read 4887 times)

barriew

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Calmac Island Class Ferry - Rhum
« on: October 25, 2015, 12:37:10 PM »

As Ferries seem popular at the moment, I thought I would show you my latest creation. The build log is on another Forum, but here are a couple of photos and a video of the operating ramp.
The ramp is designed to operate in two stages. As the ferry approaches the slipway, the ramp is dropped to just below level, the ferry then approaches the slipway and grounds the ramp, when the flap is dropped. My model reproduces this action. Unfortunately although it its sails very well in a forward direction, and has an excellent turning circle, it won't go in reverse.  {:-{ :(( {:-{  A bit of  problem for this type of vessel. I think it is caused by the shape of the hull and position of the props. <*<
Barrie
http://vid1371.photobucket.com/albums/ag293/barrienw/VID_20150918_152321874_zpsimsw54ce.mp4
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BFSMP

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Re: Calmac Island Class Ferry - Rhum
« Reply #1 on: October 25, 2015, 04:15:46 PM »

What a very nice model.
How long is it please and was it easy to build.
I am as a first timer looking for something that is easy to carry and yet a pleasing model to build.
I have looked as these simple to build ( forgot the name of them) pusher type tug boats, but to be honest don't really like them as I would like something with a little more character.

Thank you,
jim.
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Big Ada

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Re: Calmac Island Class Ferry - Rhum
« Reply #2 on: October 25, 2015, 05:08:23 PM »

What a very nice model.
How long is it please and was it easy to build.
I am as a first timer looking for something that is easy to carry and yet a pleasing model to build.
I have looked as these simple to build ( forgot the name of them) pusher type tug boats, but to be honest don't really like them as I would like something with a little more character.

Thank you,
jim.

Springer Tug was the name you were after, and you can build character in to any boat.
A door is either 27" or 30" wide so that should give you some idea about length.
Do you live in this Country Jim.

Regards,

Len.
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BFSMP

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Re: Calmac Island Class Ferry - Rhum
« Reply #3 on: October 25, 2015, 05:32:44 PM »

Hello Len, thank you for that......a little brain blip I think......just couldn't remember the name.

Yes, I live in the Over Wyre area of the Fylde. My days of gallivanting abroad are long gone.

jim
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barriew

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Re: Calmac Island Class Ferry - Rhum
« Reply #4 on: October 25, 2015, 07:23:59 PM »

Its 500mm long - that's one of the reasons to build it, the other the opportunity to make the ramp work. The hull is basically a box, so very easy. I'll PM you a link to my build log on the other forum.


Barrie
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BFSMP

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Re: Calmac Island Class Ferry - Rhum
« Reply #5 on: October 25, 2015, 07:39:53 PM »

thank you Barrie.

jim.
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derekwarner

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Re: Calmac Island Class Ferry - Rhum
« Reply #6 on: October 25, 2015, 08:01:35 PM »

Hullo barriew...that bow ramp is very interesting  :-))

We see the external flap being lowered [by the cylinder's] when the main section of the ramp is down, then again raised followed by the main section being hoisted

We assume the chains are for emergency holding as they do not retract, however we hear a servo chattering at the last part of the lifting

Would be interested to understand how the mechanism works.......Derek


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barriew

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Re: Calmac Island Class Ferry - Rhum
« Reply #7 on: October 26, 2015, 06:57:13 AM »

Derek
On the full size ship, the ramp is operated by two hydraulic rams. In practice, the rams lower the ramp until the chains stop it. The ramp is then grounded on the slipway, when further extension of the rams lowers the flap. My objective was to reproduce this action. The original model just raised and lowered the ramp and didn't operate the flap.
As I was unable to find any working 1/48th scale hydraulic rams, they are simulated using a servo, some cable and a clevis. Like the full size, the model 'ram' is anchored to the hull at one end, and to the flap at the other. The tubes are merely to guide the cable and look like the rams.
It took quite a bit of experimentation to find the right servo - a high torque, metal geared one with a sturdy arm, the right clevis - a metal one, and the right cable - plastic coated steel.
As I said, there is a full build log on another forum - a Google search will doubtless find it :-))


Barrie



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BFSMP

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Re: Calmac Island Class Ferry - Rhum
« Reply #8 on: October 26, 2015, 04:19:50 PM »

Hello Derek

I found it thanks to help by the builder, Barriew  on here:  http://www.thercmodelboatforum.com/t1148-calmac-ferry-rum

A super read and a lovely model.

Jim
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derekwarner

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Re: Calmac Island Class Ferry - Rhum
« Reply #9 on: October 26, 2015, 08:57:37 PM »

Thanks Barrie & Jim.....yes an interesting ramp build  :-)).... Derek
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bassplayer1

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Re: Calmac Island Class Ferry - Rhum
« Reply #10 on: October 26, 2015, 11:13:55 PM »

Love it, nice little gem :-))  The rump works really good!!! Great work! As about the reverse problem I've got the same too and I found out that you have to go very easy on the throttle keeping the revs really low! Try that!!!If you slam the stick at full reverse you're more likely to go forward instead of backwards! Must be the shape of the hull at this point
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barriew

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Re: Calmac Island Class Ferry - Rhum
« Reply #11 on: October 27, 2015, 06:34:16 AM »

Love it, nice little gem :-))  The rump works really good!!! Great work! As about the reverse problem I've got the same too and I found out that you have to go very easy on the throttle keeping the revs really low! Try that!!!If you slam the stick at full reverse you're more likely to go forward instead of backwards! Must be the shape of the hull at this point
OK, I will although I have tried most speeds. I plan to try to alter the propshaft angle to get at least part of the prop below the water --- sometime %)  We are about to lose our sailing water to the anglers, so there is not much incentive to do anything at the moment.


Barrie
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Arrow5

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Re: Calmac Island Class Ferry - Rhum
« Reply #12 on: December 12, 2015, 02:05:38 PM »

Your new project perhaps Barrie ?    Fergusson`s Yard launched a another ferry for Cal-Mac yesterday.   A hybrid similar to it`s predecessor and using Lithium batteries.
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Perkasaman2

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Re: Calmac Island Class Ferry - Rhum
« Reply #13 on: December 12, 2015, 02:39:47 PM »

A larger size prop might catch more water under the hull when going astern.   Perky
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barriew

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Re: Calmac Island Class Ferry - Rhum
« Reply #14 on: December 12, 2015, 02:48:52 PM »

A larger size prop might catch more water under the hull when going astern.   Perky


Tried that! Didn't help, which is why I think I need to alter the angle of the shafts, although Bassplayer suggest that very low revs may work. I haven't had an opportunity to try that yet.


Barrie
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Perkasaman2

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Re: Calmac Island Class Ferry - Rhum
« Reply #15 on: December 12, 2015, 02:59:59 PM »

Can you chamfer off the rear hull step and seduce its severity, then patch and touch up the paint? This may avoid having to work inside the hull.
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barriew

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Re: Calmac Island Class Ferry - Rhum
« Reply #16 on: December 12, 2015, 05:54:24 PM »

Its possible - not sure which is the most work. Its not a real problem for now. I want to try with minimum revs first before I attack anything. As far as I can see, the model replicates the hull shape and prop position of the real world, so it must be possible to get it to work, or there would be a lot of ferries stuck on landing slips %% {-) .


Barrie
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Netleyned

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Re: Calmac Island Class Ferry - Rhum
« Reply #17 on: December 12, 2015, 06:10:05 PM »

A small ballast tank with a pump in the tiller flat.
Once loaded and ready to go, flood the tank, which
Will raise the bow from the slipway, slow astern and
awa ye gae  :-))


Ned
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