Trooper Backplate notched ring . . .

Blaxmyth

Sr Member
Well, here goes, itÂ’s been bugging me for a while . . .

I’m part way through building a trooper backplate mould – verrrry slowly – and the notched ring has been bugging me lately. Actually, the tropper backplate has been bugging me for years and years – what did they use and why? The ring looks like a found part, rather than something that was made from scratch. Well, we now know they used all sorts of parts and that they had access to a Derwent engine.

HereÂ’s some pics of what IÂ’ve done so far.
dsc02291uc2.jpg

dsc02290cq9.jpg


IÂ’m not quite sure of exactly who made the original ANH armour moulds, but I gather they were connected with the crew who constructed the rest of the props, whereas AA made the helmet mould and did the vacforming of the armour. I stand to be corrected on this.

Anyway, I was checking over the Derwent pics again and I spotted this – the pic where the interconnector was outlined in red – and was struck by how the serrated ring appears to be very similar to the ANH pic of the trooper backplates (Compressed photos of the HD original attached – thanks to the person who capped and posted these).

derwent1ajb0.jpg

troopersanhcb1.jpg

trooperbackplateanhqn5.jpg

trooperbackplate2anhkh3.jpg


Then I checked out the original pic I posted on the Emitter thread and was also intrigued by the apparent similarity. Then I found a few more.

a23nq2.jpg

derwentcutnw1.jpg

derwentcut1a1jg2.jpg

derwentcoupler1a2kz0.jpg

a11ie2.jpg


Is there a chance the trooper’s backplate ring might be the locking ring (or whatever Derwent part) from the intercooler? – or has it already been identified?

I wondered why the notches would be there, then surmised it might be to allow tightening by hand (or more likely) by some sort of wrap-around spanner, like the old bike spanners. The fact that there appears to be 12 notches seems explainable by the fact that most lathes have indexing wheels with 24 or 12 notches – or at least mine does.

Please excuse the heap of pics, but the last time I posted something like this it turned out really cool. :D

What say you? Phil

BTW - HereÂ’s where I got some of the photos: http://www.gasturbineowners.com/derwent.htm
 
Don't know if it's been found before, but damn good detective work on your part regardless. :thumbsup
 
You are definately on the right track Phil. I looked last year for the same thing but never found an exact part. I made my own with some pipe and stuck on the 'knobs' and used some bondo to taper the edges before making a cast of it.

Keep up the good work :thumbsup
 
Well spotted, although I don't know if the Elstree prop guys would have been trucking greeblies over to AA's shop like that. Although AA clearly had access to those little metal knurled cones that pop up on everything. Hmm.
 
It even looks to have the same number of teeth. Wouldn't it already be on the sculpt before AA got it?
 
I think you could be absoluetely right. Well spotted.

I have a bunch of these but mine only have 9 teeth instead of 12. Similar to the one in this pic (notice the wider teeth):
a23nq2.jpg


Mine came from an engine that didn't have the correct Obi emitters but did have the correct IG-88 heads. The diameter seems to match my GF armor almost perfectly though.

I bet that the correct version with 12 teeth came from an engine that had undergone the same upgrades as the one the Obi emitter came from.

<div class='quotetop'>QUOTE(clutch @ Feb 13 2007, 05:09 PM) [snapback]1418038[/snapback]</div>
It even looks to have the same number of teeth. Wouldn't it already be on the sculpt before AA got it?
[/b]


Here's what mine look like and compared to the one on my GF armor.
rings1.jpg

rings2.jpg


They are ever so slightly bigger than on the armor but that could be from shrinkage due to recasting, right?
 
Thanks for the comments, guys. I'm not 100% sure I'm right, but close enough to have me intrigued. I think there appear to be some undercuts on the metal piece, like the threads and so on, so I wonder if they mightn't have vacformed over one, then used that to make the mould, which might account for some size difference and also the softer appearance.

Who knows? :unsure
 
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