7mm An APT in 7mm

Stu Fox

Stu Fox

Western Thunderer
I could've mentioned the permanent way quality as a factor - but, from experience, this rarely appeared to bother the Southern (BR) engineers/accountants too much. I would though, try to incorporate some level of transition profile and cant to curves to lessen the chances of derailment...

Regards

Stu
 
iploffy

iploffy

OC Blue Brigade
mth said:
Ian
You are trying to over complicate things. With the 2 motors in the middle, one will be pushing 7 coaches the other will pull, and it wont matter which way the set runs. With what you are saying, your idea you mean you will be only able to run it one way.
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Mat that's 4 motors 1 in each of the power cars and 1 in each of the driving cars at the end both front and back of the set so it will be able to run in either direction.
 
mth

mth

Western Thunderer
iploffy said:
Mat that's 4 motors 1 in each of the power cars and 1 in each of the driving cars at the end both front and back of the set so it will be able to run in either direction.
Click to expand...
If you do that, then you have a good chance of overloading the controler.
 
adrian

adrian

Flying Squad
iploffy said:
Mat that's 4 motors 1 in each of the power cars and 1 in each of the driving cars at the end both front and back of the set so it will be able to run in either direction.
Click to expand...

mth said:
If you do that, then you have a good chance of overloading the controler.
Click to expand...
You could always wire them up with diodes and a freewheeling clutch mechanism.:thumbs:
That way the trailing driving car becomes non-powered.
 
iploffy

iploffy

OC Blue Brigade
Or I could go for the easier option of 1 less motor in the middle. The train itself is going to be a big beast and I don't think that 2 motors would have the necessary umph. Now as regards the lighting and power sharing systems , the articulated bogie acts as a rigid bar coupling so the logical thing to do is to have the cars joined in two's(to keep the number of connections down) and where they meet the next 2 use a multi-pin plug to transfer lighting and Bus bar feeds through the open gangway. As far as the tilt is concerned I am very interested in (even though it is not essential) ways of making it tilt one suggestion has been servos, how would you control these how could you wire a tilt switch into the system to make it all work, so many questions and thoughts.
 
iploffy

iploffy

OC Blue Brigade
More thought today on how to transfer the buffing forces and at the same time allow the coach still to tilt.
If you look at the diagrams there are 2 idea's one involves a cup and ball idea and the other a cone. with a little more development either one will work, to make the unit tilt together I intend to insert flexible nylon rods through the gangways at the top so they will all tilt together but at differing rates. I.E. the first coach will be at full tilt but the second one due to the flex in the nylon rod is at 3/4 tilt then the next one due to the flex in the nylon rod is at 1/2 tilt through and so on. I am looking at using lead weight in the bottom of the coaches in the under skirt to act as a pendulum so when it goes round a left hand bend the underweight is slung out to the right hand side causing the coach top to swing into the left. I am looking at making making some kind of damper to iron out the actual movement so it is fluidic rather than chunky.Tilt system.png
Well constructive criticism required as to why it should or shouldn't work required please

Ian
 
Jim S-W

Jim S-W

Western Thunderer
Hi Ian

Both methods may lead to wobble on the straight bits. Its a bit of a predicament really. The nylon idea might work but have you considered the effect of the curves themselves? Th nylon on the inside will be under compression the one of the outside under tension which could actually tip the coach the other way.

Given that a coach really needs 3 point compensation for stability could you use some sort of servo to provide the tilt on 2 bogies for every 4 vehicles?

Cheers

Jim
 
iploffy

iploffy

OC Blue Brigade
Sorry Jim read your post properly this morning ,the Nylon rods will be fixed to one end in one coach and be allowed to move through a slightly larger hole in the second coach sorry it's me not being awake.

Jim I am considering making a POP train to test out the theories, as for the nylon its only an idea. I think I would probably go for a plastic as pliable as a cable tie hence the reason for 2. I like the idea of 2 out of 4 but I think it would need to be on each car as they follow each other into turns, If there is no mechanism on one coach is the first mechanism on the coach in front of it going to be strong enough.

As for the wobble I am hoping that the Dampers will stop alot of it but the inherent stability of the 3 point suspension (up side down tractor hitch idea) 2 on top 1 underneath will be enough. Ideally I am going to source adjustable dampers maybe from a radio controlled car so I can adjust the sensitivity of it fingers crossed.
 
dennis-rs

dennis-rs

Western Thunderer
About time you went Dcc it can be done using servos and time delay to tilt the coaches in sink one after another, around the bend you could activate it using an i-dot system at the begining and end off the bend one to start the tilt and the other to return it upright, Also you percived proble with wobby would not be an issue as the servos would keep the coach solid
Mark i have finished playing with the fire engine

JOHN:D
 
Osgood

Osgood

Western Thunderer
It would have been so so easy with good old 3-rail, just offset the centre rail a little on the bends and have guide wheels on each coach to tilt body :rolleyes:
 
iploffy

iploffy

OC Blue Brigade
Well ,well ,well didn't we get up bright eyed and bushey tailed this morning, pick on ze colonel day is it, for a start most of the RAF are ir-odts you only have to watch Ello Ello and it takes someone with intimate knowlege of being an idiot to suggest ways of copying the behavior
 
marsa69

marsa69

Western Thunderer
Oooh someone is cranky today. Quick. Someone get the colonel some tiffin. Read the post again SAH! The fireboy was having a pop not the Sarge, I was just saying that the RAF find them useful especially the officer types
 
Stu Fox

Stu Fox

Western Thunderer
Ian,

I reckon you'll have to look at track elevation as well as tilt to corner properly. BR had to do some pretty big changes when they realised 'This Is The Age Of The Train' (can we still do that quote?)

Regards

Stu
 
iploffy

iploffy

OC Blue Brigade
Like it, 'Fire Boy' another strange breed, courageous yes!! but would you really want to rush into a burning building with nothing more than a hose pipe but to do it in your spare time
 
iploffy

iploffy

OC Blue Brigade
Stu Fox said:
Ian,

I reckon you'll have to look at track elevation as well as tilt to corner properly. BR had to do some pretty big changes when they realised 'This Is The Age Of The Train' (can we still do that quote?)

Regards

Stu
Click to expand...

Stu we are already looking at canting the track due to the 6ft curves we had to put in to get it to fit in the garden it will help but again it will need some research with a pop train to iron out the kinks (so to speak) . but this brings with it more problems due to the fact that all of my 4 wheel stock is non compensated the lead in (Transition ) will have to be gradual so in theory the whole layout will not be flat

Ian
 
Stu Fox

Stu Fox

Western Thunderer
Sweet! Proper civil engineering...

It would be quite a sight seeing an APT in 7mm snaking through an S bend...

Regards

Stu
 
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