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Australian NR in G - Scratchbuilding. - More Practical Help - Your Model Railway Club
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 Posted: Wed Aug 4th, 2010 04:44 am
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MaxSouthOz
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I've wanted for a long time to do a sound project with the "Big daddy",  Loksound XL decoder.  Eight Auxiliary functions, 1 Watt sound amp and 1 Watt of motor power.  Tim the Toolman eat your heart out.

Inspired by John Teal's excellent Class 25, I decided to do the Australian NR diesel.  There were 120 built and are giving service across Oz.  I sourced a pair of motor units and they arrived today. 

The axle spacing is 145 mm and on the NR, it's 38000.  That makes the scale around 1:26, I hope.  I've got hold of some drawings and scaled them up to 1:1 for the model.




There's a fan forced smoke unit and some black smoke oil coming.  It should be a cracker !



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 Posted: Wed Aug 4th, 2010 05:58 am
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RJR
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"should be a cracker" would seem like and understatement !! What will be your primary construction material ??

John

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 Posted: Wed Aug 4th, 2010 07:11 am
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Marty
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oh boy, oh boy, oh boy... these beasties drag the Indian Pacific past my front door 6 times a week , 3 coming in and 3 going out. And boy do they have some grunt.



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 Posted: Wed Aug 4th, 2010 07:23 am
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owen69
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i always thought "MAD MAX" was fictional,seems i got that wrong!!:mutley:mutley

boy this is going to be some build and a must watch at that, what a beaut.

:wow:lol::lol::cool:

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 Posted: Wed Aug 4th, 2010 07:51 am
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Sol
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Now Max, you are NOT taking that with us to the NMRA convention - no room in the car!!

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 Posted: Wed Aug 4th, 2010 07:58 am
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owen69
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Sol wrote: Now Max, you are NOT taking that with us to the NMRA convention - no room in the car!!
hell you won`t need a car Sol,

:mutley:mutley:lol::cool:

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 Posted: Wed Aug 4th, 2010 08:16 am
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MaxSouthOz
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That's why I was pumping you about the styrene sheet, John.  Sitting looking at the beast, I thought I might make a sub-structure of 3mm MDF (my usual material of choice), and then clad it with styrene.

It works out at about 845 mm overall at the couplers, so it's going to be sizable at 1:26, but I'm having to match the power blocks which are that scale.

I would like to take it to Melbourne next year for the NMRA Convention, so I'll probably have to build a trailer for the car as well.  :mutley

The thing I'm most excited about will be the serious noise it will make.  :twisted:



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 Posted: Wed Aug 4th, 2010 09:26 am
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ddolfelin
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Awe inspiring.

Not sure about MDF as the basis for the structure but that, of course, is a matter for you.

Had you thought about laminating plasticard?
Might help with curved profiles too.



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 Posted: Wed Aug 4th, 2010 09:56 am
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MaxSouthOz
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I'm still thinking about all media, dd.  I build most of my stuff in MDF, so I have confidence in it.  I've never worked with plasticard, but I might have a play while I"m deciding.



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 Posted: Wed Aug 4th, 2010 03:44 pm
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10mm foamex sheet Max nice and light but very strong. :thumbs

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 Posted: Wed Aug 4th, 2010 04:28 pm
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phill
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This is going to be some awsome beast mate. Cant wait to hear the noise as well.

Phill

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 Posted: Wed Aug 4th, 2010 08:59 pm
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MaxSouthOz
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It's going to be a bit of work to get to the noise stage, Phill.

Thanks, Dave.  I've not seen Foamex here.  Do you know what it's made of?  It might here be under another brand name.



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 Posted: Wed Aug 4th, 2010 09:24 pm
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Photoman
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Hoho! Now this is a project I will be keeping a firm eye on! Those blueprints look immense!

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 Posted: Wed Aug 4th, 2010 09:27 pm
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Max

Why not pop down the local sheet metal place and get them to form you up a 10swg U channel you could use as the base of the chassis which you could build everthing from that will be really soilid plus give you low down weight.

Brian

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 Posted: Wed Aug 4th, 2010 09:32 pm
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MaxSouthOz
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Yes, they are 3 x A4 pages stuck together.  I thought it would be an easy way to take measurements while I'm building.  I stuck a set on a piece of MDF to keep the perspective.

Thanks, Brian.  All input gratefully recived.  Low down weight isn't going to be much of a problem.  The motor blocks weigh about a kilogram each !



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 Posted: Wed Aug 4th, 2010 09:38 pm
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henryparrot
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As a guide The sd45 and Dash 9 i have here g scale ones at a guess must weigh at least 10 kilo each i can measure them more exactly if that helps you in the design Max

Brian

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 Posted: Wed Aug 4th, 2010 09:46 pm
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MaxSouthOz
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I haven't weighed them exactly, Brian.  Last night I modified them for DCC and I was just going by how heavy each one felt.  I might pop them on the scales.



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 Posted: Wed Aug 4th, 2010 09:49 pm
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MaxSouthOz
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750 grams, Brian.  That's 1 lb 9 oz in the old money, I think.



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 Posted: Wed Aug 4th, 2010 09:58 pm
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henryparrot
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You only need roughly another 8.5 kg then Max hows your lead supplys is there a church near you:lol::lol:

Did Hollywood foundry make up the bogies for you Max?

Brian

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 Posted: Wed Aug 4th, 2010 10:14 pm
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MaxSouthOz
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The motor blocks are made by USA trains, Brian.  If you look carefully, you can see that the outer axle is articulated to help with tight curves, but I'm going to plate it to make it easier to build all the running gear.  The bogies will pivot near the centre instead of on the ponies.



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