Skylark loco build

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ge_rik
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Re: Skylark loco build

Post by ge_rik » Wed Oct 13, 2021 6:10 pm

Outside frames have now been printed and fitted so I thought I'd giver her a test run to make sure they didn't bind on the fly cranks. I think I got away with it



Rik
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Andrew
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Re: Skylark loco build

Post by Andrew » Wed Oct 13, 2021 6:29 pm

ge_rik wrote:
Wed Oct 13, 2021 6:10 pm
I think I got away with it
It looks like it, well done, she runs beautifully!

It may not be possible, or indeed desirable to you, but I wonder whether curving the rear of the frame up and over the pony truck and continuing it as far as the rear buffer beam might balance the back of the loco visually? I think it would mirror prototype practice too. Just a thought - it'll look lovely just as it is!

Andrew.

PS Isn't "Skylark" a lovely name for a class of locomotive??

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Peter Butler
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Re: Skylark loco build

Post by Peter Butler » Wed Oct 13, 2021 7:18 pm

Lovely little loco Rick, superbly built and runs sweetly too! A little time spent on the surface finish will be time well spent.
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Re: Skylark loco build

Post by philipy » Wed Oct 13, 2021 7:34 pm

Very nice end result from a fast drawing and print job. Just shows the value ofa 3D printer.

I'm in agreement with Andrew though, it does look very empty under the cab, around the trailing axle.

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Re: Skylark loco build

Post by Peter Butler » Wed Oct 13, 2021 8:59 pm

If the frames cannot be extended, perhaps steps would do the trick?
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Re: Skylark loco build

Post by ge_rik » Wed Oct 13, 2021 9:07 pm

You're right, the back end is a bit sparse. Now I've tested that the trailing bogie behaves itself, I can figure out how to fill some of the space.

The buffer beams have now been extended downwards. I'd like to try lowering the body somehow but that would require major surgery on the motor block so I might have to live with it as is.

Apparently, it's not really a Skylark but this design was based on or inspired by the class.

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Re: Skylark loco build

Post by ge_rik » Thu Oct 14, 2021 8:49 am

ge_rik wrote:
Wed Oct 13, 2021 9:07 pm
I'd like to try lowering the body somehow but that would require major surgery on the motor block so I might have to live with it as is.
The fundamental problem is that the driving wheels are too large. It's not possible to replace them - there wouldn't be enough clearance under the motor block (and the Bachmann wheels are moulded on to axle stubs) but I think I can lower the running board by hacking a few lumps off it. However. This would leave insufficient room above the cylinders for the Walschaerts valve gear which was used on the actual locos.

The drawing of the proposed MWB loco on which this is partly based shows Joys valve gear which is a bit simpler so I might try squeezing some sort of representation of that in instead.

I can use a fair bit of modellers' licence as, to my knowledge, Kerr Stuart never produced a three foot gauge loco derived from the Skylark design - that's my story and I'm sticking to it ..... 🤭😃

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Re: Skylark loco build

Post by ge_rik » Thu Oct 14, 2021 10:14 am

Just had a comment on YouTube from one of the team building a full size replica of the original loco ...... He says he'd like to see my model for real when its finished 😱 No pressure then ....... :?

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Re: Skylark loco build

Post by philipy » Thu Oct 14, 2021 10:49 am

ge_rik wrote:
Thu Oct 14, 2021 10:14 am
Just had a comment on YouTube from one of the team building a full size replica of the original loco ...... He says he'd like to see my model for real when its finished 😱 No pressure then ....... :?
Thats what happens when you stick your head above the parapet....! :lol:

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Re: Skylark loco build

Post by ge_rik » Thu Oct 14, 2021 2:32 pm

Decided I didn't like the "sit-up and beg" look of the loco and so took razor-saw in hand and attacked the motor block and the body. I've dropped the body by 7mm. It needed to be 8.5mm to match the drawings but that's as far as I can safely go. I think it now looks a lot better.
IMG_2265.JPG
IMG_2266.JPG

Rik
PS - Now noticed the boiler seems to be slanted up towards the front. Looks like another tweak needed.
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Re: Skylark loco build

Post by Andrew » Thu Oct 14, 2021 3:48 pm

I didn't think it'd make that much of a difference - but it does! Looks great!

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Re: Skylark loco build

Post by Lonsdaler » Thu Oct 14, 2021 5:48 pm

ge_rik wrote:
Wed Oct 13, 2021 9:07 pm
You're right, the back end is a bit sparse.

Rik
I must work on my speed reading - you'll never guess what I thought that said... :lol:
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Re: Skylark loco build

Post by ge_rik » Thu Oct 14, 2021 6:18 pm

It was only 2mm, but isn't it amazing what a difference that makes. Still plenty to do, but feeling a lot happier with it now.
IMG_2267.JPG
IMG_2268.JPG
IMG_2269.JPG

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Re: Skylark loco build

Post by philipy » Thu Oct 14, 2021 7:17 pm

Looking much better after all of today's tweaking, well done.

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