Advanced Passenger Train- E (experimental)

thruxton

thruxton

Western Thunderer
This is to introduce the scratch build of an APT-E in 7mm scale. The project follows an earlier proving exercise (APT-E-E?) that involved a rough built model and temporary bogies to determine operational characteristics for a working tilting train in this scale.

Most will know of the Hornby APT and its cam induced tilt. In operation, the tilt was extreme in tight radii and almost non existent on wider curves- we want the opposite!

The proving model demonstrated stable dynamic tilt was easily achieved given lightweight body and relatively heavy bogies. Specially geared ABC traction motors were used and these will be reassigned to the new model.

Development is now well in hand and utilises some techniques borrowed from the flying model aeroplane world.

An illustrated work in progress will start in the next few weeks.
 
Osgood

Osgood

Western Thunderer
Do you think we could get that guy on the hypothetical liveries thread to knock up a green with full yellow ends APT?
 
Steph Dale

Steph Dale

Western Thunderer
I'm really looking forward to seeing this. I was involved (briefly, organisationally) in the resurgence in interest that the prototype has had and regain a soft spot for the poor thing, despite never having seen it at work ( I kinda grew up with the P-trains)

Added to which I've long thought of modeling it...

Steph
 
thruxton

thruxton

Western Thunderer
http://www.apt-p.com/APTModelLHooper.htm

This link should go to pictures of the proving model on the APT-P.com site. Originally intended as a set of masters for split mould GRP lay-up, a number of factors led to its consignment to the scrap heap;

- nose way too pointy (I'll show comparisons in due course)

- Trailer Car too short by @ 15mm (I had worked from drawings supplied by APT-E.org but the TC set were undimensioned. The error was verified by measurement of the real thing at Shildon).

- the multi media built up construction is now somewhat distorted

New solid blue foam body cores have now been made and await bogie construction before final finishing.
 
thruxton

thruxton

Western Thunderer
As an update, drafting work on the bogies is nearing completion. These will be mixed media with the basic framework in etched brass. The Power Car bogies are centrally pivoted while the intermediate bogies have an articulation beam which has coach pivots each end (beam itself having a longitudanal pivot fixing to the bogie).

The coach pivots include the spherical bearing (above) that 'loosely' locates in a small tower arrangement which is part of a brass section of coach floor. This brass section arrangement becomes a permanent part of the coach which can simply lift off the bogies (wiring etc permitting).In operation, all is kept together by the counter weights sitting in the coach bellies.

The height of the spherical bearing determines the ngular orientation 'tilt' of the train. In my case this height has to be rather lower than published 'pivot points' in order to remain within an acceptable loading gauge.

Hopefully this makes sense and describes a system equally applicable tp the APT-E and APT-P.

Full attention is now being paid to resolving a glitch and maintenance free support and guidance system for the 'floating' passenger door module.
 
40126

40126

Western Thunderer
My last work in Derby, aqquired part of the carriage & sidings works, when expanding, including the APT shed :rolleyes: Sadly I didnt get any photo's :rant:

Steve :cool:
 
thruxton

thruxton

Western Thunderer
And here with a gangway module showing the behaviour through a curveP1060943.JPG

The one 'tower' in view is a seating for one of the rotary bearings shown earlier. Each bearing mounts atop a sahaft fixed to each end of the bogie articulation beam (a mock up of this appears at the top of the components pic)
 
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