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In lugnet.trains, Reinhard “Ben” Beneke wrote:
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In lugnet.trains, Jason J. Railton wrote:
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On the left hand is a wheel from 396 etc. And I never saw a broken one. My
spokes are twice as thick as these old one have been.
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Personally, I prefer a smaller wheel (3 studs across the hub). What size is
this across the hub, rather than the flange?
|
Have not measured it myself (in millimeters) so far, only in
CAD-coordinates...
|
From your own picture, eyeballing the measurement by holding pencils up to the
wheel and the ties below it and so forth, I get that the hub diameter is just a
smidgeon below 4 studs across, while Jason of the green engine wants 3, which
coincidentally is about the diameter of the wheel you show next to it (the one
used in the 7750?).
Given that wheel exists, why do another one that diameter (ignoring for the
moment what the price of that wheel actually IS) ??
That said, though, I think for freight locos I’d rather err a bit smaller too, I
guess. I have never seen a graph of engine population density vs driver diameter
so I’m guessing but I think smaller may be a bit more common than say 5 or 6
studs across ala the Thatcher Perkins driver you show on the other side. But I
don’t see 4 as totally too large by any means. In fact I think it’s a good
choice.
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In lugnet.trains, Larry Pieniazek wrote:
| |
In lugnet.trains, Reinhard “Ben” Beneke wrote:
| |
In lugnet.trains, Jason J. Railton wrote:
|
| |
On the left hand is a wheel from 396 etc. And I never saw a broken one. My
spokes are twice as thick as these old one have been.
| |
Personally, I prefer a smaller wheel (3 studs across the hub). What size
is this across the hub, rather than the flange?
|
Have not measured it myself (in millimeters) so far, only in
CAD-coordinates...
|
From your own picture, eyeballing the measurement by holding pencils up to
the wheel and the ties below it and so forth, I get that the hub diameter is
just a smidgeon below 4 studs across, while Jason of the green engine wants
3, which coincidentally is about the diameter of the wheel you show next to
it (the one used in the 7750?).
Given that wheel exists, why do another one that diameter (ignoring for the
moment what the price of that wheel actually IS) ??
That said, though, I think for freight locos I’d rather err a bit smaller
too, I guess. I have never seen a graph of engine population density vs
driver diameter so I’m guessing but I think smaller may be a bit more common
than say 5 or 6 studs across ala the Thatcher Perkins driver you show on the
other side. But I don’t see 4 as totally too large by any means. In fact I
think it’s a good choice.
|
I’m coming to the same conclusion, I was originally envisaging a bit larger. But
the large size of the flanges makes the dimensions you have to take into account
for footplate height much larger than on a ‘scale’ model. The size ben has
chosen would give the most possible applications.
Tim
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That said, though, I think for freight locos I’d rather err a bit smaller
too, I guess. I have never seen a graph of engine population density vs
driver diameter so I’m guessing but I think smaller may be a bit more common
than say 5 or 6 studs across ala the Thatcher Perkins driver you show on the
other side. But I don’t see 4 as totally too large by any means. In fact I
think it’s a good choice.
|
Given 5 bricks=6 ft (a minifig), then 5 bricks is if anything, midrange.
engines I have data on here- 8P (DoG) was 74”, a UP FEF was 80”, J is 70”,
German 05 is 90”, NYC J3A 79”, GWR Castle 80”, German P8 69”
So, a 5 stud diameter looks about right to me.
James
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In lugnet.trains, James Powell wrote:
| |
| |
That said, though, I think for freight locos I’d rather err a bit smaller
too, I guess. I have never seen a graph of engine population density vs
driver diameter so I’m guessing but I think smaller may be a bit more common
than say 5 or 6 studs across ala the Thatcher Perkins driver you show on the
other side. But I don’t see 4 as totally too large by any means. In fact I
think it’s a good choice.
|
Given 5 bricks=6 ft (a minifig), then 5 bricks is if anything, midrange.
engines I have data on here- 8P (DoG) was 74”, a UP FEF was 80”, J is 70”,
German 05 is 90”, NYC J3A 79”, GWR Castle 80”, German P8 69”
So, a 5 stud diameter looks about right to me.
James
|
How many of those are high speed passenger locos though? In terms of population
density, low speed freight locos were much more predominant and they had smaller
drivers.
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| |
| |
Given 5 bricks=6 ft (a minifig), then 5 bricks is if anything, midrange.
engines I have data on here- 8P (DoG) was 74”, a UP FEF was 80”, J is 70”,
German 05 is 90”, NYC J3A 79”, GWR Castle 80”, German P8 69”
So, a 5 stud diameter looks about right to me.
James
|
How many of those are high speed passenger locos though? In terms of
population density, low speed freight locos were much more predominant and
they had smaller drivers.
|
Most of the above are passenger- DoG is a one off. But, the P8 was a bit more
than a make up- there were 3800 of them built. :). Also, when you look at the
UK, 9F’s have a 60” dia wheel, which is small for most mainline locos- and I am
assuming most people here don’t model 0-4-0 tank engines with 30” wheels :)
Go stand next to any loco, and you will see what I mean- they tower over most
people quite nicely :). Even a CP 0-8-0 that I was near recently- the wheels
are not as tall as I am (6’) but they are still quite close.
James
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In lugnet.trains, James Powell wrote:
| |
| |
| |
Given 5 bricks=6 ft (a minifig), then 5 bricks is if anything, midrange.
engines I have data on here- 8P (DoG) was 74”, a UP FEF was 80”, J is 70”,
German 05 is 90”, NYC J3A 79”, GWR Castle 80”, German P8 69”
So, a 5 stud diameter looks about right to me.
James
|
How many of those are high speed passenger locos though? In terms of
population density, low speed freight locos were much more predominant and
they had smaller drivers.
|
Most of the above are passenger- DoG is a one off. But, the P8 was a bit
more than a make up- there were 3800 of them built. :). Also, when you look
at the UK, 9F’s have a 60” dia wheel, which is small for most mainline locos-
and I am assuming most people here don’t model 0-4-0 tank engines with 30”
wheels :)
Go stand next to any loco, and you will see what I mean- they tower over most
people quite nicely :). Even a CP 0-8-0 that I was near recently- the wheels
are not as tall as I am (6’) but they are still quite close.
James
|
Speak for yourself... :-)
The other thing this ignores is that a lot of steam trains (the Castle class
certainly) had the main drivers going up through a slot in the sole-plate.
That’s why they have wheel arches, and why British steam locomotive nameplates
are all curved, to fit the arch.
This is very hard to model in Lego, particularly if you want the wheelbase to
flex through corners. That’s why I prefer a smaller wheel, so that it can pass
underneath the body. I certainly wouldn’t want to try with anything larger than
what Ben has proposed.
Jason Railton
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In lugnet.trains, Larry Pieniazek wrote:
| |
In lugnet.trains, Reinhard “Ben” Beneke wrote:
| |
In lugnet.trains, Jason J. Railton wrote:
| |
Personally, I prefer a smaller wheel (3 studs across the hub). What size
is this across the hub, rather than the flange?
|
Have not measured it myself (in millimeters) so far, only in
CAD-coordinates...
|
From your own picture, eyeballing the measurement by holding pencils up to
the wheel and the ties below it and so forth, I get that the hub diameter is
just a smidgeon below 4 studs across, while Jason of the green engine wants
3, which coincidentally is about the diameter of the wheel you show next to
it (the one used in the 7750?).
Given that wheel exists, why do another one that diameter (ignoring for the
moment what the price of that wheel actually IS) ??
|
Well the only 3 reasons I can think are:
1. Mounts on a Technic axle
2. has hole to attach connecting rod
3. has optional counterweight
None of which I think the 7750 wheel has 8?)
ROSCO
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