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Post by Deleted on Aug 5, 2014 18:01:11 GMT
Hello Will,
Is that 4 wheel driving truck you are using of the usual simple design? I ask because I was contemplating designs like Dave Hudson swinging link to have the easiest running possible but if you get on OK with your Lamb perhaps I'm thinking about it too much for a Tich.
A simple four wheeler would save me a lot of time.
Cheers,
James.
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Post by Deleted on Aug 5, 2014 18:13:12 GMT
Hi Matey !!--- Maybe some resilient rubber block rather than locked-up solid ?? ( I've heard it can work ).....
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Post by Deleted on Aug 5, 2014 19:24:57 GMT
Hello 4930.
I haven't really thought of axle compensation yet but will incorporate something. Rubber could have the possibility of reducing moving parts...Do you post over at the land of blue invoices? Its either that or you've got a ''double''...
Cheers,
James.
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Post by gingerneer on Aug 5, 2014 19:37:19 GMT
John, i did catch the sun at bit, but the afternoon was a lot nicer.
Julian, yes its a nice track. Maybe not quite as smooth as Bournemouth's track (we ride on 7 1/4" drive trolleys) but it adds a bit of fun to driving. In the afternoon I was let loose on the Club Brit and a S 15, total different animals to the Lamb. Rowing use to be my main hobby, i have spent many hours rowing up and down the Itchen it the rain and shine. I would always look out for any trains on the Southampton track as we went passed on Sunday Mornings.
James, the trolley is built using Dave Hudson swing link units. They are fantastic, its fascinating to what the wheel sets 'steer' always keeping the axle at right angle to the rails. Failing that a trolley with bearings on each wheel individual so you don't get the slipping of one wheel on the rail head as you go around a curve. Hope that makes sense.
Hagley, it think its as much to do with the tyre profile as its to do with the suspension letting the wheel float. It does feel different almost unnerving at first, it feels like hoovering or gliding curves make no difference compared to a ordinary wheel set.
Will
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Post by Deleted on Aug 5, 2014 21:16:37 GMT
Hello 4930. I haven't really thought of axle compensation yet but will incorporate something. Rubber could have the possibility of reducing moving parts...Do you post over at the land of blue invoices? Its either that or you've got a ''double''... Cheers, James. ------------I am many things to many people !! Better by far, to bite a Bullet than gaze at a "Constellation"........I'm off now, with a "Flea" in my ear !!
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Post by Deleted on Aug 5, 2014 21:42:55 GMT
4930-----Ten out of ten!! I'm just glad you didn't come over all Machismo.
Will, thanks for letting me know. I have the relevant articles, maybe I should bite the bullet as everyone seems to really rate them.
Regards,
James.
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Post by Deleted on Aug 5, 2014 23:22:49 GMT
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Post by doubletop on Aug 6, 2014 19:35:50 GMT
Hi
Can somebody please post some details of " the trolley is built using Dave Hudson swing link units" . I was discussing running these small locos with a club member last night as another Lamb is due to hit the tracks. A free running lightweight trolley would be useful to both of us.
Pete
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Post by gingerneer on Aug 6, 2014 21:05:04 GMT
Pete, the model engineering articles are year: 2003, 190, 4189, pg 191, David Hudson to 2003 191 4201 pg 152 David Hudson If you can't find them i do have a copy of the articles. He gives are very good explanation of how it works, and proves methods to form the wheel profile. Dave Noble can supply parts. www.davenoble.co.uk/ Does the 'Lamb' down under have any mods? Will
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Post by doubletop on Aug 11, 2014 10:29:41 GMT
Will
Apologies for the tardy reply.
I'm a few weeks too late otherwise I could probably have grabbed the articles off the ME site now the digital issues now are an additional cost I've lost that option.
The 'Down under Lamb' isn't mine but I suspect no mods, other than gas firing. The builder has done an outstanding job on the finish but he hasn't fired it yet. I checked with him on Sunday and still hadn't tried it. My interest being I've done a Northumbrian and if the Lamb can pull a load the the Nothumbrian should be able to do something, although the Lamb could have more traction with the four coupled wheels.
Having seen your video it's got me thinking I should try load hauling again. My Northumbrian runs fine on gas. I run it on R/C and gave a small camera mounted on pole with servos. I do have a video of it running continuously for 1.5hours from lighting up until the gas ran out. Only stopping for water and oil or while the bigger guys got in the way. At 3Gb its a bit long for YouTube and I don't have a PC with enough grunt to edit the file (and who would want to sit through it anyway?)
More later when Ross gets his Lamb going and we have bit of a session together.
Pete
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Post by Deleted on Aug 11, 2014 11:26:30 GMT
Pete,
I can thoroughly recommend the David Hudson driving trucks for smaller locos. They are very free running compared to the fixed axle type. We've got two in the club which came from Dave Noble as ready built chassis. A lot of our club members don't like them as they think the suspension is a bit 'wobbly' but I use them all the time. The difference they make to 2½" gauge locos is amazing and they just fly round the track instead of struggling.
All our passenger trucks are also to the David Hudson design.
John
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Post by gingerneer on Aug 11, 2014 13:41:27 GMT
Hi Pete
I will PM you regarding the articles. I did run the 'Lamb' at Staines Model engineers open day (a good bunch of guys, they know how to make a good bacon bun). It was not a total failure....... She did run better with driving axle locked up (no bouncing around), i also put some softer springs on the front axle. But the ash pan was rubbing on the rail for the 2 1/2" gauge track. I guess part due to locking the rear axle and Southampton and Bournemouth not having 2 1/2" gauge track i made the ash pan sit too low under the fire box (when i look at it its at rail height). She did manged a lap, but she was slipping a lot and could not make it up the incline with out a push. So back to the drawing board!
Will
I though i had lost this post so typed a new one up. after the forum crashed on me.
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Post by gingerneer on Aug 11, 2014 13:54:36 GMT
Just tried to post and the forum crashed, so starting again
Pete, i remember your build (on another forum i think). You made a great job of it. Yes i think the 'lamb' will do well around the track when i get all the little bits sorted. I am more worried about keeping the water level right and the fire going, the trolley really helps lower the rolling resistance. I could try an sneak some more weight on her with lead lagging! I tried to run her a Staines open day, but the ashpan rubbed on one of the 2 1/2" gauge rails.
John, wobbly or floating like a boat! It feels weird at first when you glide around a curve. I first used one on a ground level were their are lots of tight curves (Its a folded over fight of 8). I really need to make a better frame for the wheel units, the current frame was my first go a welding, its not going to fall apart but its far from pretty.
Will
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Post by gingerneer on Apr 8, 2015 11:33:25 GMT
I had a good run on Easter Monday, although it has highlighted a couple of niggles that i would like to sort before the 3 1/2" gauge day. The video below was about half a lap the the Littledown track. I did struggle to hold the phone while driving and firing so apologies for the camera work. Towards the end to see me pushing down on the boiler, while she makes enough steam to get up this steep part of the track she does lack adhesion.
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Post by Deleted on Apr 8, 2015 12:39:53 GMT
I enjoyed the video - that is a really lively little engine !
Incidentally the very small driving truck I made for my Tich many years ago has a Flexichas - an idea borrowed in concept from 00 locomotive kits .
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