M Menu
b 0 Items s

SLNER P2

gowest

894 posts

Ericm

thanks for the information will find some wheels in my wheel box and if I can't get them to track up will turn off the flange must look up Cartazzi

gowest

894 posts

Found this on the forum

Wobblinwheel

1312 posts

What are your opinions on the so-called "Cartazzi trucks" on these Hornby Pacifics? My very first opinion of this design, with the flangeless wheels, was completely ridiculous and unacceptable. Watching the rear "bogies?" completely leave the rails, stop turning, and hover in mid-air around curves, just simply looks idiotic to me! To build such highly-detailed models that look so WRONG going around curves, well, the logic behind the design eludes me. I have managed to modify my two A4's by cutting-out the plastic vertical "ridges" inside the truck frame, and Dremelling out a concave relief so the wheels can slide all the way against the metal chassis. Also installing flanged wheels, of course! This allows the wheels to slide FULLY to the outside (against the plastic outer frame), and to the INSIDE (flat against the metal chassis). I have also installed, above the axle, a small coil spring (by drilling a shallow relief hole to hold it there) in order to exert slight downward pressure on the wheels. I have found this to work perfectly. Even around relatively sharp curves AND points! I have since found out, on one loco, that small plastic "shims" over the axles will work instead of springs, to keep the wheels from "riding-up" off the rails. It still seems to me a PIVOTING truck would've been a much better idea! What do you think? Don't you think loco wheels "hovering" in mid-air looks a little STUPID?? Especially since they're not even TURNING! Since they are SPOKED wheels, this is painfully obvious.....

Posted at  16:32:58 Wed, 21 Jan 2015Edited at  16:36:50 Wed, 21 Jan 2015Approved/Moved at  16:36:50 Wed, 21 Jan 2015 (Reply to this Topic

M. Crafton

fReport

gowest

894 posts

Just thought I would show you this as I have now got it running with all the wheels going on compressed air at 20 psi

 

walkingthedog

18598 posts

Looks good Gowest.

 

I had a couple of pacifics with the fixed truck and flangeless wheels but got rid of them because they looked daft on curves. I know they are more 'realistic' but I don’t think this sort of realism is necessary on a rtr model loco. 

WTD ........... Nurse, the screens.

gowest

894 posts

WTD

You are right about how much detail is needed,

when running my Hornby electric very high detailed engines bits fall off from  to time but maybe that's just me 

atom3624

862 posts

That looks fantastic - and excellent selection of locomotive.

Can't wait to see the next updates!!

 

Al.

Fishmanoz

9732 posts

Wow gowest, 20psi and it seems to have lifted right off the track and is flying!  Can’t wait to see steam-driven on approach to Gatwick. Make sure you file a flight plan though or you may get shot down given recent events. 

 

Sorry, couldn’t help myself. Waiting to see future progress though.

and thanks for all the fish

gowest

894 posts

Fishmanozo

yes it ran well on compressed air but when I tried it on the track in steam it was very poor not starting on its own with out a push and then only went 2 ft and stopped it did run a little better backwards but ran out of steam very quickly so after all that work a complete failur.

one of the problems is all the chassis that I'm using now are none runners that I bought some years ago and have problems before I start  the mods.

i have spent at least 3 days trying to find out what the problem is with this engine and have gone through every part taking it to bits and inspecting ever part. In the end I cam to the conclusion that the valve assembly was worn to the point that when hot it was acting differently from when cold and running on compressed air all looked fine. I think Hornby did find a problem with this part and on later models chrome plated it which while a good idea for the rotating valve and stopped any wear to the valve port faces not so good on the valve shaft as this is stainless steel which is a mixture of chrome and steel means you are now running 2 metals of the same type against each other which will cause them to wear out faster and if poor oiling is added to the equation it life becomes even shorter.

i have toyed with the idea to re engineer this part and make it a lititle better but getting back to the engine I decided that I would replace the valve assemble which would need machining it as the valve unit is a none standard part now for this engine plus change the cylinder assembly so a major rebuild along with making up new connecting rods.

all this work was carried out and after a few runs in steam it has run much better there are still problems like the main drivers are slipping which is bad as this uses up the steam fast and leaves the engine out of steam at some point and the engine sits there while the pressure builds up then it's off again with wheels spinning till it reaches the same point again and stops due to lack of steam.

This is the old part remove and a new one made

 

so now the question arises which wheels need rubber tyres and will have to remove them from the engine and machine some grooves in the metal tyres

i did get the from bogies to run ok so at least one thing went with out a hitch but as to the set under the cab lots of problems there using flanged wheels has presented a problem and I see why Hornby opted for flangeless wheels floating above the track.

so still lots to do which is Nearly all rework to get the engine to run properly plus still working on making the outside valve gear rotate 

Now your up to date Ken

walkingthedog

18598 posts

I’m amazed by your patience.

WTD ........... Nurse, the screens.

gowest

894 posts

WTD

As a much younger man I might have given up on this one but I do like odd looking engines so must give this one more try 

ken

Please create an account or login to reply.

Forum Rules

  • The Hornby Forum is intended for discussion of all things model railways. Primarily a place for newcomers to ask questions and seek assistance from like-minded individuals, the Hornby Forum offers a user community for all those interested in railways.
  • Discussion of non-Hornby brands is allowed, however, active promotion or advertising of these brands is not permitted.
  • Please keep in mind that the Hornby Forum is a publicly viewable space and you should never post personal information (including email addresses). 
  • While every effort is made to contact you before any censorship, we reserve the right to amend or remove any content without explanation.
  • All customer service enquiries should be directed to Hornby Customer Services.

Useful Links

Forum Guidelines

Membership Restricted Product