The Unofficial Mamod and Other Steam Forum The Unofficial Mamod and Other Steam Forum
The Original Toy Steam Forum
Established 2006
The biggest, most popular global steam forum around! Accept NO imitations!
We have a growing community of regular posting members who chat about all aspects of toy and model steam.
 
FAQ :: Search :: Memberlist :: Usergroups :: Join! (free)
Profile :: Log in to check your private messages :: Log in



Chat Safe Rules

Main Menu
Home
Forum
Forum Articles
"New" toy for the workshop
TE1 slide valve conversion
NEED A BIGGER KITCHEN!
A nice surprise
Found a death penny
Daveyp2 wedding
The Colliery build begins.
My new car
Cirrus project
Opportunity Or What
Links Menu
Welcome
The original and largest global toy and model steam forum on the net. THE place where steam enthusiasts hang out.
Going at it headfirst - purchased my first live steamer!
When I fitted radio control to my Telford last year I placed the receiver and battery in the tender, using bits and pieces I had in my spares box. This included a very small rechargeable battery pack which kept the weight down but gave me a less than 10 minutes reliable power for the radio control receiver. Recently I replaced the battery with a much larger one for a longer run time. The tender now weighed over 1 kg as I also used real coal for added realism. Unfortunately this extra weight plus the gradient on my garden track, proved too much for the Telford.

So earlier today I removed the radio control and reverted to a manual regulator. To stop the loco running away down hill or stalling up hill I adapted another tender by fitting a Zecar flywheel device.

It hasn't been totally successful as there's something wrong with the Zecar mechanism that's causing its internal drive train to vibrate at certain speeds. I therefore had to use my mark1 flywheel device fitted into a wagon in order for the Telford to run happily in a controlled manner

Here's the video, warts and all.

https://youtu.be/8BNevjlUkmg
Going at it headfirst - purchased my first live steamer!
Mike, I built a momentum wagon using a Zecar and had exactly the same issue; this was cured by the application of a couple of drops of thick oil (I used some 460 steam oil as it was close at hand!). Still noisy when fitted inside a tin Mamod wagon, though!  

Is there no way you can even out the gradients on your line a little? Owning several old SL Mamods, I was very aware of the need to keep the track as level as possible, but even so the part I built a couple of years ago has settled slightly in some places.

As for your Telford's erratic performance, have you considered fitting a pressure gauge? It won't increase the power obviously, but can help greatly in diagnosing problems; sometimes it's difficult to understand exactly what is going on without knowing what's happening inside the boiler. As supplied, I find these engines do not perform at all well outside if there is even a breath of wind, due to the poor design of the combustion chamber.
Going at it headfirst - purchased my first live steamer!
Quote:
I find these engines do not perform at all well outside if there is even a breath of wind

That's a good point. Yesterday was extremely windy and the burner blew out twice. Even when alight I'm guessing the wind is taking a significant part of the burner's heat away from the boiler, just because its externally fired.

Quote:
Is there no way you can even out the gradients on your line a little?

I've already reduced it once and any further levelling has been vetoed by the head gardener as it would make the bottom part of the track too intrusive. At the moment the steepest bit of the gradient is around 1.5cm in 100cm so 1.5%. All my other locos manage it well, especially the Brunel, which doesn't even notice. Here's a brief clip of three of them (Brunel, Bertie and Ragleth):

https://youtu.be/Ae5oXwqDqAc

You'll notice that, unlike the Telford, they hardly increase speed on the downhill stretch or slow up much on the uphill. Its the tight curves that give them the most trouble, presumably because they don't have differentials.

Quote:
had exactly the same issue; this was cured by the application of a couple of drops of thick oil

I've found the probable cause - the nylon wheel in the Zecar has a moulding fault so is unbalanced and, I think, is causing the mechanism to vibrate at a certain speed. I've a spare Zecar so will fit that instead.

Quote:
have you considered fitting a pressure gauge

Good idea, in the short term I can borrow one from from the Brunel. With the windy weather yesterday I suspect the Telford was finding it difficult to get up steam (but again the Brunel had no trouble, although the burner design is very different).

Quote:
I find these engines do not perform at all well outside if there is even a breath of wind, due to the poor design of the combustion chamber.

Certainly my Telford runs fine indoors on my portable layout. Still has the tight curves but is totally flat and of course, in still air.
Going at it headfirst - purchased my first live steamer!
I'm up for my next challenge now. I want to add some passenger rolling stock to my developing fleet and I've gone ahead and bought myself the full length VOR Matchboard Summer Coach fro IP engineering. I'm not sure if this comes with the dreaded plasticard roof, if it does I'll be replacing it with some thinner, more malliable sheets. I've also got some figures on the way. I'll keep you guys posted as to when it arrives and how the build goes.
Going at it headfirst - purchased my first live steamer!
I was at Mamod yesterday and had the opportunity to take a few photos.
Here's a couple showing the new design of heat shield with no air holes.





Other news is that future Telfords (along with the Mk111 and saddle tank) will have regulators with coarse threads to allow the fitting of radio control.

Further in the future you might find the Telford's cylinders lowered to be horizontal, but that's quite a way off and not something you could retro fit very easily.
Going at it headfirst - purchased my first live steamer!
Ahh, that looks much better. I really must give them a call and enquire about getting mine retro-fitted, if they can offer that. I suppose this should theoretically eliminate the oil buildup and the wind whipping up underneath. The coarse thread also sounds interesting and I'll be making similar enquiries. I suppose its a spinoff of the Sterling development.

What are the advantages of horizontal cylinders?
Going at it headfirst - purchased my first live steamer!
Coldgunner wrote:
Ahh, that looks much better. I really must give them a call and enquire about getting mine retro-fitted, if they can offer that. I suppose this should theoretically eliminate the oil buildup and the wind whipping up underneath. The coarse thread also sounds interesting and I'll be making similar enquiries. I suppose its a spinoff of the Sterling development.

What are the advantages of horizontal cylinders?


The revised combustion chamber sides should help resist the effects of the wind, and also stop some heat being wasted thus not requiring the burner to be turned up as high. Sadly they won't help with the condensate issue, but I believe that they have tried to tackle this problem by extending the exhaust further up into the chimney.
I don't see any major problems with retro-fitting the combustion chamber sides, but unfortunately the regulator on these engines is an integral part of the boiler.

As for making the cylinders horizontal, this would also require them to be mounted lower down, which would improve stability by lowering the centre of gravity. It would also look better, and allow the footplate to be lower, again improving the general appearance.
Going at it headfirst - purchased my first live steamer!
Email has been sent to Mamod with regards to retrofitting the new changes, lets see what they say in the coming days...
Going at it headfirst - purchased my first live steamer!
SLR wrote:
Sadly they won't help with the condensate issue

Totally agree.

I blanked off those combustion chamber wall holes on my Mark II using a piece of brass banding back in Feb 2013 (just before the narrow venturi problem was highlighted by Mamod). Whilst not conclusive, I found I had to have the gas turned down a bit more to stop the flames licking over the boiler, it definitely got hotter to touch & with the gas turned down that bit more it lasted longer fortunately with the gas running out just as the water got to the low level.

Going for horizontal cylinders introduces the problem of where the eccentric valve strap goes (it is currently offset on the rear axle to go behind the front wheel, with the piston valve block directly behind the cylinder).

Chris Cairns
Going at it headfirst - purchased my first live steamer!
New issue!

There seems to be a small leak coming from the gas tank itself. Found this out the hard way when it caught a flame the other night, I was able to quickly douse it without hassle. To spot the leak I removed it from the loco, plugged up the end and placed it in a bowl of water. When it was under water I opened the gas tap. Initially there seemed to be a tiny amount of gas eminating from the tap itself, but this soon stopped and started to come from the screw on top.

I tighted the screw on top and the gas leak seemed to die down and stop.

Could this be a result of the recent temperatures we've been having and a seal coming a bit loose or would there be something fundamentally dangerous about the tank and warrant replacing?

Its not a cheap part to replace, but if its safer I'd be able to accept that.
Going at it headfirst - purchased my first live steamer!
I'd have a word with Mamod directly
Going at it headfirst - purchased my first live steamer!
The 'O' ring on your gas regulator valve needs replacing.



These 'O' rings degrade over time with exposure to the butane or mixed gas. I'm sure Mamod can supply you with a few spare ones. Whilst you are waiting for those you can probably get away with coating your current 'O' ring with some vaseline, and do that with the replacement one as well.

Whilst you have the gas regulator valve out why not mark it up for easy setting reference. I cut a slot using a model razor saw, then fill that slot with some red paint. Ideally the slot should be vertical for the closed position, but I've found over time that these Mamod gas regulator valves have a bit of give & the closed position creeps slowly clockwise (this one below started out at vertical but is now at 3 o'clock for the closed position).



The hex head bolt on the top of the valve is to stop you fully unscrewing the valve, so make sure you do not tighten it too much that it stops the gas regulator valve shaft from rotating. You will need to remove this bolt to allow you to fully unscrew & remove the valve

Chris Cairns
Going at it headfirst - purchased my first live steamer!
I've been working on the full length VoR open coach this week, progress has been good. This has a better roof than the plasticard one from the van, that should be less of an armwrestle to get on.

DSC_0366 by Coldgunner, on Flickr
Going at it headfirst - purchased my first live steamer!
Now that's a long coach. Be interesting to hear how it copes with tight curves.

Good to hear no plastikard roof with this one. I picked up 2 old unbuilt IP Eng kits recently, fortunately these date from before the introduction of the plastikard roofs.

Chris Cairns
Going at it headfirst - purchased my first live steamer!
DSC_0386 by Coldgunner, on Flickr

Done!

This went together really well. I've not tried it on a running track yet but its a solid kit. It took one coat of wood stain and the black is all handpainted. Footboards are also woodstained too and have provided a nice protective coat. I've not fitted lighting to this one, I'm not sure if the real ones have lighting. The clips were still on in that shot while the last bit of glue dried.
Page Previous  1, 2, 3 ... 10, 11, 12, 13  Next
Page 11 of 13
Categories
General Chat, Buying & Selling
Build It, Fix It, Steam It, Show It
Members Section
Popular Topics
Rum Runner a build log
Photobucket problem
Something is on the horizon
New Twin Cylinder Steam Engine
New Mamod about to be launched
Is this savable?
Meths burner wont burn !
Slot car 1:32 Night Race
Twin Victoria steam plant
What is it ? (video falling tree added )


Card File  Gallery  Forum Archive
smartBlue Style © 2002 Smartor
Powered by phpBB © 2001, 2002 phpBB Group
 

Welcome to The Unofficial Mamod & Other Steam Forum!
Welcome. We're a friendly place to share knowledge & chat about this great hobby. Since our July 06 startup, we have grown to over 2500 members, who have posted over 1 1/4 million posts. We can answer most toy steam questions, basic or complex. Our multi-national members enjoy sharing photos & videos of engines by Mamod, Wilesco, Jensen, Bowman, SEL, Doll, Bing, Scorpion, Renown & more. All collectors are welcome & if you are just starting out in the hobby, we can suggest some ideal engines. Our forum is ad free & costs nothing to be a member.
Press the 'Join' button at the top of the page, to be part of the largest toy steam forum on the internet.
For membership or joining issues email Sandman: sandmansmail665@gmail.com
Engine of the Month August
EOTM
Redryder's
1914 Ernst Plank Distillery
Reproduction by Russell Snyder
Click picture to enlarge