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by Russ Elliott
Mon Oct 09, 2017 1:02 pm
Forum: Layouts and Operations
Topic: Glenmutchkin - A Bit of a Slip Up
Replies: 155
Views: 30990

Re: Glenmutchkin - A Bit of a Slip Up

Is there a reason why you are not powering the slip from its middle?
by Russ Elliott
Wed Oct 04, 2017 10:38 pm
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 169
Views: 17417

Re: Crab Comet conversion

Julian Roberts wrote:That is what I had measured Russ. Do you say that taking my word for it or by calculation from the forbidding looking formula on the CLAG page on these hornblocks.?

Both.
by Russ Elliott
Tue Oct 03, 2017 4:12 pm
Forum: Layouts and Operations
Topic: Construction of a Test Track
Replies: 611
Views: 49635

Re: Track Construction for a Test Track

That DCC Concepts bullhead doesn't look particularly bullhead to me.

What's the head width, btw?
by Russ Elliott
Tue Oct 03, 2017 4:11 pm
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 169
Views: 17417

Re: Crab Comet conversion

Great idea Russ, thanks for that. I'm not so sure it's a great idea at all. I was merely reporting what John Brighton did, as a professional builder who couldn't afford to spend much time thinking and faffing about. If you are bottoming out your front and rear drivers, what's the point in going to ...
by Russ Elliott
Mon Oct 02, 2017 1:02 pm
Forum: Layouts and Operations
Topic: Construction of a Test Track
Replies: 611
Views: 49635

Re: Track Construction for a Test Track

Nice pics, Allan.
by Russ Elliott
Mon Oct 02, 2017 10:42 am
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 169
Views: 17417

Re: Crab Comet conversion

What is becoming clear is that a weighted tender hanging off the back will be counterproductive...unless it could be arranged to have its hook acting near the centre of the loco, a challenge I would think. A symmetrically weighted tender of say 100g will typically impose 40g onto the back of a loco...
by Russ Elliott
Mon Oct 02, 2017 10:11 am
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 169
Views: 17417

Re: Crab Comet conversion

The idea is to bottom out the front and rear bearings. Why? 100g axles will deflect the Brassmasters springs about 0.7mm to 0.8mm. Which seems fine. What John Brighton did regularly with the Brassmasters was to take off about 0.5mm from the spring tongue and aperture top of the middle axle. This co...
by Russ Elliott
Tue Sep 26, 2017 1:08 pm
Forum: Exhibitions
Topic: Scaleforum 2017
Replies: 129
Views: 15456

Re: Scaleforum 2017

I usually leg it from Stoke Mandeville station to the stadium, but this year was feeling a bit under the weather and decided to make my way from Aylesbury station. However, arriving there shortly before 11 00 am, the exhibition bus didn't happen for me and the dozen or so other hopefuls, and after 3...
by Russ Elliott
Tue Sep 26, 2017 12:32 pm
Forum: Jeremy Suter
Topic: Brian Morgan Chassis and Iron Mink Instructions
Replies: 26
Views: 4011

Re: Brian Morgan Chassis and Iron Mink Instructions

The Iron Minks did look very good.

It's somewhat amazing they haven't been done in RTR.
by Russ Elliott
Sat Jul 15, 2017 12:14 pm
Forum: Vehicle dynamics and trackholding
Topic: B2B wheel creep
Replies: 8
Views: 1146

Re: B2B wheel creep

I don't understand how a plastic-centred wheelset could short out over a 3-way, whatever its BB was.
by Russ Elliott
Wed Jul 05, 2017 9:16 am
Forum: Vehicle dynamics and trackholding
Topic: Bogies do naughty things
Replies: 2
Views: 652

Bogies do naughty things

Here's an interesting video: http://bcove.me/5jpn7ncs

(Unfortunately, it was not possible to embed the video in this post, and it may or may not play in your browser, depending on your flash capabilities and settings.)
by Russ Elliott
Mon Jul 03, 2017 8:15 pm
Forum: Starting in P4
Topic: West Lothian Starters Group Track making notes based on West Scotland Group track making course
Replies: 18
Views: 3152

Re: West Lothian Starters Group Track making notes based on West Scotland Group track making course

Reference "There is the chance of the droppers interfering with the levelness of the rail, so I prefer to leave them off at this time", how thick is that copper 'Wiring Connector Strip'? I'm probably pre-empting the next pdf installment, but all that filing down of the underside of the tim...
by Russ Elliott
Fri Jun 30, 2017 12:54 pm
Forum: Track and Turnouts
Topic: P4 vs S4 - Pro's and con's
Replies: 164
Views: 20828

Re: P4 vs S4 - Pro's and con's

I would say the debate has been chortling along for nearly 40 years, and will probably chortle along for another 40 years. It's no bad thing to check our perceptions and understandings of these things. It's probably quite healthy.
by Russ Elliott
Wed Jun 28, 2017 7:28 pm
Forum: Other Buildings and Scenery
Topic: Gwr lineside fencing
Replies: 15
Views: 1679

Re: Gwr lineside fencing

Some nylon lycra threads are very fine, and stretchy. (Or alternatively, use 48SWG enamelled copper wire.)
by Russ Elliott
Mon Jun 26, 2017 10:30 pm
Forum: Exhibitions
Topic: Scalefour Society AGM, 17 June 2017
Replies: 29
Views: 5012

Re: Scalefour Society AGM, 17 June 2017

Some pics of the event, mostly by Clive Burrows. (I've included a link to Kelly Harding's blog page. If anyone has more pics, please let me know.)

I'll try to add a few more names to faces, but my brain is doolally.
by Russ Elliott
Fri Jun 16, 2017 8:09 am
Forum: Exhibitions
Topic: Scalefour Society AGM, 17 June 2017
Replies: 29
Views: 5012

Re: Scalefour Society AGM, 17 June 2017

Please can someone confirm whether or not you can you use an Oyster card on the Number 10 bus from Watford station? I don't think so. The Number 10 times are showing a frequency of about every 12 minutes on a Saturday: https://www.arrivabus.co.uk/herts-and-essex/services/10---woodside-to-holywell-e...
by Russ Elliott
Thu Jun 15, 2017 10:39 am
Forum: Track and Turnouts
Topic: P4 vs S4 - Pro's and con's
Replies: 164
Views: 20828

Re: P4 vs S4 - Pro's and con's

We seem to have come full circle and proved that the thing supposed to set a minimum dimension fails completely to set a minimum dimension, but in fact establishes a maximum dimension that we are not allowed to talk about.
by Russ Elliott
Wed Jun 14, 2017 12:52 pm
Forum: Trains: Model and Prototype
Topic: Thoughts on Motors
Replies: 73
Views: 10367

Re: Thoughts on Motors

And large torques on bevels means large axial thrusts...
by Russ Elliott
Wed Jun 14, 2017 12:19 pm
Forum: Trains: Model and Prototype
Topic: Thoughts on Motors
Replies: 73
Views: 10367

Re: Thoughts on Motors

I've nothing against bevels, but they do require very precise positioning on both axes.
by Russ Elliott
Wed Jun 14, 2017 12:06 pm
Forum: Track and Turnouts
Topic: P4 vs S4 - Pro's and con's
Replies: 164
Views: 20828

Re: P4 vs S4 - Pro's and con's

Julian Roberts wrote:Scruffy drawing attached.
download/file.php?id=14262&t=1

How does that set a minimum?
by Russ Elliott
Wed Jun 14, 2017 10:07 am
Forum: Track and Turnouts
Topic: Re: Track and Wheel Standards
Replies: 35
Views: 4958

Re: Track and Wheel Standards

Keith - I've taken the opportunity of re-styling your useful spreadsheet, and making any clearance violations automatically appear in red. (I would have sent it to you via PM, but attachments aren't allowed in the PM system.)

P4 stds.xls
(22 KiB) Downloaded 65 times
by Russ Elliott
Sun Jun 11, 2017 2:26 pm
Forum: Railway Buildings
Topic: Digest 62, bridges and viaducts
Replies: 1
Views: 716

Re: Digest 62, bridges and viaducts

I'm also wondering if early bridges and viaducts had lower parapet walls then the 4'6" shown. I think some were nearer 3'? I would agree. The middle parapet portion of this beauty is possibly near 4' above 'deck height', but the outer portions are a lot lower. railway_bridge_kerne.jpg The deck...
by Russ Elliott
Sun Jun 11, 2017 10:20 am
Forum: Armchair Modeller
Topic: Here We Go... Miscellaneous Conversions To P4
Replies: 7
Views: 1317

Re: Here We Go... Miscellaneous Conversions To P4

I am almost tempted to consider some kind of sprung suspension. The Bachmann drive bogie doesn' lend itself to a conventional springing route without a drastic rebuild, but, thinking off the top of my head, I'm wondering whether a slither of 2mm neoprene between each bearing and its plastic frame m...
by Russ Elliott
Sat Jun 10, 2017 9:14 pm
Forum: Armchair Modeller
Topic: Here We Go... Miscellaneous Conversions To P4
Replies: 7
Views: 1317

Re: Here We Go... Miscellaneous Conversions To P4

Over most of the trackwork, the whole thing runs very well, but the motor bogie occasionally derails in a couple of places. Bachmann pitch freedom in its bogies is good, but their Achilles heel is usually a lack of roll freedom, which I suspect explains why the drive bogie is ok on its own, but can...
by Russ Elliott
Tue Jun 06, 2017 12:02 pm
Forum: Track and Turnouts
Topic: P4 vs S4 - Pro's and con's
Replies: 164
Views: 20828

Re: P4 vs S4 - Pro's and con's

wheel-runout.gif
wheel-runout.gif (1.85 KiB) Viewed 3123 times

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