Thor

Advert

New Replies

Report Bug

Help/FAQs

Thor

This topic is empty.

Viewing 25 posts - 1 through 25 (of 354 total)

1 2 3 … 13 14 15 →

Author

Posts
23 February 2014 at 16:05 #47248
Paul T
Participant
@pault84577
Dear All

After researching the requirements for a towing / steering event vessel this thread will follow the design and prototype build of a 3ft event tug called Thor.

The first prototype, which is purely to test the design, will be made from foam board and card.

Any comments or advice will be gratefully received.

Paul
Advert

23 February 2014 at 16:05 #6931
Paul T
Participant
@pault84577
Design and build of a towing event tug
23 February 2014 at 16:29 #47249
Bob Abell 2
Participant
@bobabell2
Hello Paul

A picture is worth a thousand words

Bob
23 February 2014 at 17:53 #47251
ashley needham
Participant
@ashleyneedham69188
~~(or 2000 in PT`s case)~~

Paul. 3 spiffing imperial feet is a jolly decent size for a tug, and will be quite heavy. Could you run through a few of the criteria for this vessel and your design features, for our education please

I would be most Interested to hear the thoughts and background behind this vessel, as opposed to just designing another tug.

Ashley
23 February 2014 at 18:31 #47257
Paul T
Participant
@pault84577
Bob

Here is a picky

Ashley

I was coerced into designing a vessel for towing and steering events and after a little research I have worked up a basic design.

It will have two 'big' 12v motors pushing 60mm 5 blade propellers, kortz nozzles will provide the steering and to aid manoeuvrability it will have thrusters front and rear.

As a towing tug it need plenty of mass so it will be heavy and sit low in the water.

The tow hitch will be just rear of the superstructure and its supporting structure will be cast into the keel and frames so that when it pull the load will be spread throughout the entire hull.

As the design develops I will update you with modifications and progress reports.

Paul
23 February 2014 at 18:38 #47258
ashley needham
Participant
@ashleyneedham69188
Paul. This is one of those funny parrot nosed fronts , isnt it? Love the shape and colour scheme!

The thrusters need to be stonking items. Stock or inventive home design? Those pumps that DM found as suggestions for the bait boat would be nifty items to have. Need two probly as non-reversing. Two of Bobs snazzy articulated rudders might obviate the need for a thruster at the rear end??

Thinking about it, a nozzle such as found on the front of an API88 Hovercraft would be sexy to have at the front using a DM pump . wow. Exciting!

Ashley

Edited By ashley needham on 23/02/2014 18:41:07
23 February 2014 at 18:49 #47260
Paul T
Participant
@pault84577
Hi Ashley

It is a variant of the parrot nosed rig supply vessels but the bow has been altered to an icebreaker profile and the hull has been lengthened and widened to increase displacement.

As I want the model to crab steer it will need the four thrusters for which I am looking at using the pumps that DM suggested.

Paul
23 February 2014 at 18:51 #47261
ashley needham
Participant
@ashleyneedham69188
Yowza! Am I good or wot!! Ashley
23 February 2014 at 18:53 #47262
Gareth Jones
Participant
@garethjones79649
You seem a bit hyper tonight Ashley, have you been sniffing the glue again?

Gareth
23 February 2014 at 19:10 #47264
Paul T
Participant
@pault84577
Or it could be blue

Paul

ps Gareth if it is glue then it must be 40% proof
23 February 2014 at 19:28 #47265
Colin Bishop
Moderator
@colinbishop34627
Reminds me of the old rhyme:

The God of War rode out one day

Upon his snow white filly

'I'm Thor!" he cried

The horse replied

You forgot your thaddle silly!

Sorry!

Colin

Edited By Colin Bishop, Website Editor on 23/02/2014 19:29:09
24 February 2014 at 16:08 #47269
Dave Milbourn
Participant
@davemilbourn48782
Been browsing the web for suitable pumps and can't find anything to touch 12v Rule bilge pumps (non-automatic). Here's a useful US site with lots of technical data for PT to play with viz a viz thrust required and flow rates etc (right up a plumber's street…..) **LINK** while here is the most comprehensive UK supplier's website **LINK**

I shall have to give the electrickery a little more thought, but four separate speed controllers for the thruster pumps is not an option I'll be exploring. Probably an ACTion P94 in Mode 2 with a few Schottky diodes sprinkled around to make sure the pumps only run one way.

DM
24 February 2014 at 16:41 #47270
Paul T
Participant
@pault84577
Hi Dave

Thanks for the US link the data will be useful

Meanwhile the design has changed slightly as I have flattened off the parrots nose.

Paul
24 February 2014 at 17:15 #47272
Dave Milbourn
Participant
@davemilbourn48782
It's still blue. Is it pining for the fjords? I think I prefer the Mk1 conk for looks.

DM
24 February 2014 at 19:10 #47273
ashley needham
Participant
@ashleyneedham69188
Yes, with DM there, the Mk1 conk is nicer (in my opinion)

Ashley
25 February 2014 at 17:03 #47278
Paul T
Participant
@pault84577
I am still playing around with the design and progress is fairly basic but the evolving card model gives you a good idea.

This general view shows the layout of the frames and the reinforced tow connection.

This side view shows the blunt bow and overall shape of the hull.

The view from underneath shows the flat bottom and hull shape.

A close up view of the tow support which is basically an 18mm the supports of which spread across the entire frame. For towing an 18mm dia post is placed into the tube and the towing line fixed to the top of the post, with this system the point load weight of the tow is spread across the entire width of the hull.

Paul
27 February 2014 at 14:32 #47302
Paul T
Participant
@pault84577
A few more progress photos showing the superstructure and basic bridge assembly.

This image shows the side elevation, the sleeve for the main towing post can be seen just rear of the superstructure.

This shot shows a close up of the bow and gives a good impression of the shapes that the finished model might use but I am still unsure about the length of the bridge wing oversail and it is very likely that this detail will change when I move onto building the timber prototype.

Another view showing the towing sleeve, theoretically positioning the tow hitch at the central point of the models mass should give the best results

I am now looking for some meaty hi torque motors that will give me the best power output, I have some in mind but I am always open to suggestions?

Paul

Edited By Paul T on 27/02/2014 14:33:11
27 February 2014 at 15:02 #47303
Bob Abell 2
Participant
@bobabell2
Paul

I do believe the correct name for the towing sleeve, is a ……."Samson Post"

We need a metre rule alongside, to get a feel for the size, please?

All the best for your new project

Bob
27 February 2014 at 15:59 #47306
Paul T
Participant
@pault84577
Hello Admiral Bob

I didn't know the Samson Post term but it makes sense.

I have misplaced my metre rule but the model is 800mm long (31inch) a good help might be the 6×6 wall tiles behind the model.

It doesn't look very professional at the moment as I am just playing around with the design and the card soon gets messed up.

Paul
27 February 2014 at 17:06 #47308
Dave Milbourn
Participant
@davemilbourn48782
**LINK**

Like the old Speed 720 but with plain bearings and a much kinder price tag! Torque figure is given in general info.

DM
27 February 2014 at 17:57 #47310
Bob Abell 2
Participant
@bobabell2
Paul

That`s a good idea, having the Samson Post in the middle!

When Great Eastern was laying cable from the stern, we couldn`t steer at all!

Just passing

Bob
27 February 2014 at 18:25 #47312
ashley needham
Participant
@ashleyneedham69188
Paul. Just a few observations and questions, please feel free to dismiss at first glance.

Should the bridge wings only be sticky out as far as the sides? or do they overhang on this sort of ship.?

The front is blunter than I thought a parrot nosed ship would be.

The bow underwater section appears to be fairly conventional. Bulbous bow? Ram (style) bow<for the parrot nose look?>

re towing post. Obviously you will be designing the rear end so as to not snag the tow-rope? And is the height above water of the Simpson post (paint it yellow) a factor?

Ashley
27 February 2014 at 18:45 #47314
Paul T
Participant
@pault84577
Ashley

This type of ship does have overhanging bridge wings but I might have overcooked mine.

The bow is based upon a highly manoeuvrable icebreaking ship, it offers little lateral drag when making tight or complicated turns.

The stern will be flat and uncluttered but the towing hitch will be 50mm above the hull sides which will put the tow line height at 105mm above the waterline. This means that the angle of the tow line will be a lot shallower than normal and should result in a better degree of control over the towed vessel.

Why yellow?

Paul

Edited By Paul T on 27/02/2014 18:54:14
27 February 2014 at 19:03 #47316
ashley needham
Participant
@ashleyneedham69188
Paul. The bridge wings do not appear to overhang much on that photo..HOWEVER…a bit of exaggeration here and there might be a styling ploy for a more "individual" look?

Would a bulb have that much effect on a model given you are grossly overpowering it (compared to a real vessel).

Sorry, the Yellow bit was a joke. I did spell the Samson post "Simpson" like the Simpson`s cartoon and they have yellow faces.

!05mm seems a very reasonable low towing height (he says not knowing anything about towing), bollard only or some sort of hitch/hook arrangement?

Ashley.
27 February 2014 at 19:12 #47318
Paul T
Participant
@pault84577
Ashley

A bulb bow would have little effect upon the main motors but the turning thrusters aren't so powerful and wouldn't need the extra mass of a bulb.

Yes I saw the simpsons and just for you I will paint the post yellow.

I haven't decided upon the best hitch yet but I will be looking at the towing tugs this weekend for inspiration

Paul

Edited By Paul T on 27/02/2014 19:14:21
Author

Posts