Rudder improvement

Advert

New Replies

Report Bug

Help/FAQs

Rudder improvement

This topic is empty.

Viewing 18 posts - 1 through 18 (of 18 total)

Author

Posts
10 August 2009 at 20:11 #22539
Bob Abell 2
Participant
@bobabell2
Made a Becker type mod to the rudder of Great Eastern

Wasn`t really necessary…….but I`ve been thinking about it for ages……can`t wait to try it out now!

Bob
Advert

10 August 2009 at 20:11 #3394
Bob Abell 2
Participant
@bobabell2
11 August 2009 at 06:55 #22557
ashley needham
Participant
@ashleyneedham69188
Bob.

Will be interesting to see if it has any effect on the G.E, being long and (relatively) thin. What proportion of the overall thrust do you rate the prop at? ie does it go just as well on prop only.

I went to the NMM at Greenwich last week and was dissapointed at the lack of models therein.Was expecting shedloads, but there are more in my shed than on view.Where are they all?? Their website says they have shedloads, or is it that they have turned all ecological and arty now??

The London science museum is the place to go for models. Nice one there of the G.E. but as usual difficult to photograph behind glass.

There was actually a diorama of the G.E being built a t the NMM, but high and also dimly lit behind glass.

Ash
11 August 2009 at 07:25 #22558
Bob Abell 2
Participant
@bobabell2
Morning Ashley

I`m really surprised how effective the screw is on it`s own and I`m only using a 540 motor, geared down by 11 to 1. Gave the blades a tweak too this week, they were on the fine side.

With prop and paddles, she fairly gallops along.

On paddles alone, the previous rudder had no effect at all, but with screw…ok

We`ve got a super museum here at Liverpool….in the midst of Dockland…..I`ll dig out a few pix I took a few years ago

See yer!………………Bob
11 August 2009 at 07:38 #22560
Paul T
Participant
@pault84577
Is this the one Ashley
11 August 2009 at 08:08 #22561
Bob Abell 2
Participant
@bobabell2
Well done Paul!

What a busy diorama!……………….But a bit too much spare wood lying around?…Especially the first picture, it looks like an ants nest?

It also reminds me of a picture out of the Gulliver`s Travels book!

What year was the model made, Paul?…………..Could be of interest?

Bob
11 August 2009 at 09:08 #22563
Colin Bishop
Moderator
@colinbishop34627
The NMM removed most of their models from display some years ago in favour of trendy “interactive” and “kid friendly” exhibits. There was a lot of criticism of this at the time. The models are still held off site and are catalogued here:

http://www.nmm.ac.uk/collections/explore/index.cfm/category/shipmodels

The Science Museum, to their credit, have maintained their main collection on display until now but if you are a regular visitor you can’t fail to notice that when many other sections of the museum are teeming with people, the ship collection is usually deserted.

The Imperial War Museum have also cut down on model displays but retained a better overall balance of exhibits – well worth a visit. Also, some of their models are displayed on HMS Belfast which is an outpost of the museum.

There is a proposal to concentrate the national ship model collections of all three museums at Chatham Historic Dockyard which has the space to display a much greater selection and, while I would like to still see a representative display in each of the parent museums, it doesn’t seem to me to be a bad solution – just as long as they have some pretty effective fire precautions in place! Judging by the job advert below, it does appear that this project is going ahead.

http://www.nmm.ac.uk/server?show=conWebDoc.1430

http://www.museumjobs.com/jobdetails.php?JobID=5796

Colin

Edited By Colin Bishop on 11/08/2009 15:53:57
11 August 2009 at 15:28 #22569
David Wooley
Participant
@davidwooley82563
Sadly and like many “maritime museums” up and down the country the ship model is no longer the main stay of the exhibited collections. Yet their remains museum gems were, perhaps by a quirk of fate the ship model has pride of place. Yet our National establishments have saw fit to reduce considerably the level of exhibition space given over to the ship model. I would agree the Science Museum is by contrast a supporter in the use of the ship model to illustrate maritime science and technology. Certainly and for the moment the Museum of Transport in Glasgow offers the best chance of seeing a wealth of maritime history in model form. Unfortunately this treasure trove of a model collection will have to be dismantled as the Museum is due for re-location in the not to distant future. As Colin has said Chatham offers the best chance to house what are in effect “hidden” collections, so at least they will be available to see and not boxed away in some dreary depository only accessible by academia and the maintenance staff.

Dave Wooley

Edited By David Wooley on 11/08/2009 15:29:55

Edited By David Wooley on 11/08/2009 15:30:47
11 August 2009 at 19:06 #22572
ashley needham
Participant
@ashleyneedham69188
The G.E diorama appears to be too messy to me, more like a scene from a giant Drakkar build?

Yes, the IWM has a good balance of ships, and I can get there lunchtime to nose around!

A telling remark viz the third floor ship gallery…we have been there a few times and its never busy, on the other hand the aircraft floor is also not too busy either. Even worse, the interesting aero engines are set on scaffolding between you and the windows so they are back-lit. Tut Tut.

A 540 geared down is a fairly MODEST powerplant for the G>E, but it is suprising how little power you need on a displacent hull for “cruising speeds”.

I read somewhere that the Island class OPV vessels (now flogged to Pakistan or somewhere) had a top speed of 16 kt on both engines. and could obtain 14kt on just one.

Ashley (master of the paragraph)
12 August 2009 at 07:33 #22578
Bob Abell 2
Participant
@bobabell2
There yer go, Ash!………A reasonabell turn of speed!

Bob

Edited By Bob Abell on 12/08/2009 07:34:56
12 August 2009 at 19:18 #22585
ashley needham
Participant
@ashleyneedham69188
Bob. yes more than adequate “go”. I am not a “scale speed” person, and like a bit in reserve. My belief is that models on the pond have to contend with all sorts of emergency situations, reckless speedboat drivers and that sort of thing (!) and need extra umph sometimes, besides which its a bit boring slowly mooching along all the time.

The correct scale speed I should imagine for your GE would indeed be a crawl.

I was disapointed with my Titanic, as it gets to a certain speed and the props start to cavitate and it goes no faster, However its fast enough and when crashing to a stop after full speed one gets that “ohmygodwillitstopintime” feeling in the tum tum as the props are thrashing away and the boat shows no signs of slowing down…. its a bit heavy and the props are very small.

This contrasts to the type42 which in full reverse stops as if hitting a brick wall (or the jetty usually if you have been distracted by a small boy with a high speed WW1 aircraft carrier)

Ashley
12 August 2009 at 20:18 #22593
Bob Abell 2
Participant
@bobabell2
Ashley……………….Is there a device which cuts off main battery power, when the Rc signal is lost?

All my paddlers have the Bobs Board type controllers, and in the event of a lost signal…….the boat carries on!………………..Don`t want to ram anybody!

Bob
12 August 2009 at 22:46 #22597
Colin Bishop
Moderator
@colinbishop34627
Yes Bob, it’s called an air rifle….

Colin
12 August 2009 at 23:17 #22598
ashley needham
Participant
@ashleyneedham69188
Colin is the daddy !!!

Some speed controllers cut out when the reciever loses signal. Obviously a Bobs board just freezes up. In your case a seperate device would be required. Dont know what..but there it is. One or two bods on the site are electrically inclined. I suspect the cheapest option would be to get one of those speed controllers!!

Ashley
7 September 2009 at 15:01 #23029
Bob Abell 2
Participant
@bobabell2
Nearly forgot to report the results of the rudder modification

Vast improvement and it was so effective, we tried to get round the steering course!

Nearly made it!…………….Bob
8 September 2009 at 18:31 #23049
Subwarrier
Participant
@subwarrier
An electric speed controller is the best option, compare the cost of a Bob’s board and a servo with an ESC and it will only be a few pounds more. Else tyou could fit an electronic failsafe, Graupner make two types, One turns the servo to a preset setting if the RX signal is lost, the other also detects the RX power level and operates if it gets below a preset level. These are used by sub nuts to blow ballast and by flying nuts to cut the motor and turn the rudder to fly into a circle.

Prices were about £15 last time I bought one but that was some time ago.

Regards

SteveJ
8 September 2009 at 19:04 #23050
Bob Abell 2
Participant
@bobabell2
Thank you Subwarrior

I think you`re right………The trouble is…….I need four of them!

Bob
10 September 2009 at 20:39 #23103
ashley needham
Participant
@ashleyneedham69188
I have just thought, you spent all that time and effort on a first class reproduction of the G.E, and then you have put a decidedly non-standard rudder on it ????

Ashley (stickler for complete accuracy-see gallery)

But one would like to think that the man himself would approve.
Author

Posts