Author Topic: JU885z (Hedge Hopper)  (Read 1260 times)

Offline Small brown dog

  • Dwelling too long on the practicalities of such things can drive you mad.
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JU885z (Hedge Hopper)
« on: January 15, 2020, 06:45:52 PM »


By 1933 Germany had become a leading advocate of the fast unarmed medium bomber concept coining the term Schnellbomber (literally "fast bomber").  The concept was taken very seriously by the new chancellor and several designs from notable manufacturers such as Heinkel, Dornier and Junkers were to enter service over the next five years.

The speed advantage enjoyed over interceptors of the day was, in part, achieved by having no defensive armament. The weight saving of having no heavy calibre guns, ammunition and gunner(s) went a long way to keeping the bombers cruising speed in excess of that of the contemporary fighter aircraft. However, the major contributing factor to the multi-engine aircrafts success was the room for additional lift and weight compensation equipment of the layout.

This was exploited to the full at Junkers Flugzeug- und Motorenwerke, where the aero engine division had made a breakthrough in very high lift/weight power units. The Jumo Elektrisch 211 power cell gave not just extra electrical generation and thrust but made use of compact additional secondary T-Coil windings solely to boost the electrical field on mass (EFM) effect.

The Woten power cell, as it was christened, was capable of generating very high voltages and Junkers went ahead with a 4 engine design which would have given Germany a first class strategic bomber from the outset of World War two. However, such was the belief in fast medium bombers in a tactical role amongst the higher powers in Germany that the 4 engine design was cancelled.

Junkers own design, The JU 885 was, after some initial teething problems perhaps the best of Germany’s Schnellbomber designs. The A  series certainly was fast and unarmed but it was found by the late 1930’s that bomber interceptor aircraft such as the British Hawker Hound and later the Supermarine Spectre, could easily intercept the Schnellbomber especially when carrying a war load.

Junkers wrung even more power out of the Woten developing a more powerful version called the “Thor” which unfortunately was excessively fuel hungry at its best energy output range and prone to early coil burn out. However, there was a use for such a power plant.

EFM power units have a ground effect characteristic similar to that of conventional lifting surfaces only coming into effect at the high power outputs a pilot would use to become airborne or use in a typical “float” touch down. 
A modified JU885 with prototype Thor units was test flown by KG 54, a unit that had specialised in low flying operations, to see if the Thor units additional power could be of use. The substantial EFM of the Thor units made it almost impossible to “sink” the aircraft below a certain height. You could of course fly the aircraft into the ground deliberately but easing down into the float felt like you were riding on the back of a flatbed lorry.

A small production batch of JU885 known as the JU885z were delivered to KG54 for low level operation development for which they were highly successful. KG54 carried out many daring early war raids including attacks on the British radio detection masts which thankfully were never followed up.

The major tactic of KG54 was to approach the target at high speed and very low level rising to bombing level some 20 miles out from the target.  By reducing the 8000lb maximum internal bomb load by 25%  the JU885z had an additional reserve of energy that could be employed on the final climb to bomb height which meant that the aircraft climbed like a lift seemingly coming out of nowhere, hitting the target and then diving back to hedge hopping height for home.

Although Britain’s advanced use of radio detection was unknown to the Germans at this stage of the war, KG54 was in actual fact unable to be seen by it owing to the specialist low level intruder raids it carried out. Thankfully, Britain had a secondary and somewhat much less technical warning system known as the observer Corp who were extremely good at their job. Once the hedge hopping technique was anticipated the Observer Corp began the hunt and the Hounds were let loose.

Footnote
There was in actual fact a Junkers design designated the JU85 with a twin fin tail around the same time as the more famous JU88 was under development but it was scrapped in favour of the 88. My JU885 has a bit of Heinkel and Dornier as well as Junkers along with a sizeable amount of bull.

Footnote 2
Some of the more sadder, sorry, eagle eyed among you will notice that the above image has a three bladed prop and the Thor unit, if you looked at it, has  four.
This is because the image above is of a KG54 aircraft fitted with the older Woten power unit.
I would get on well as a politician with truth adjustments like that ;)



Its not that its not real but it could be that its not true.

Offline Old Wombat

  • "We'll see when I've finished whether I'm showing off or simply embarrassing myself."
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Re: JU885z (Hedge Hopper)
« Reply #1 on: January 15, 2020, 09:21:57 PM »
Ni-ice! 8)
"This is the Captain. We have a little problem with our engine sequence, so we may experience some slight turbulence and, ah, explode."

Offline GTX_Admin

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Re: JU885z (Hedge Hopper)
« Reply #2 on: January 16, 2020, 02:39:50 AM »
More images please
All hail the God of Frustration!!!

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Offline Small brown dog

  • Dwelling too long on the practicalities of such things can drive you mad.
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Re: JU885z (Hedge Hopper)
« Reply #3 on: January 16, 2020, 03:10:23 AM »
More images please


I have nothing really finished as I only built to have something for the Hound to shoot at :)
There is this pre weathered texture test render:


...and this panels bump map test:

Its not that its not real but it could be that its not true.

Offline apophenia

  • Patterns? What patterns?
Re: JU885z (Hedge Hopper)
« Reply #4 on: January 16, 2020, 03:53:40 AM »
Great stuff  :smiley:  And love seeing your in-progress texture tests  :-*
"Now it is 1984; Knock-knock at your front door ..."

Offline Old Wombat

  • "We'll see when I've finished whether I'm showing off or simply embarrassing myself."
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Re: JU885z (Hedge Hopper)
« Reply #5 on: January 16, 2020, 08:47:37 AM »
CG modelling (especially 3D) is a mystical art, to me, but damn that's good! :D
"This is the Captain. We have a little problem with our engine sequence, so we may experience some slight turbulence and, ah, explode."

Offline Small brown dog

  • Dwelling too long on the practicalities of such things can drive you mad.
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Re: JU885z (Hedge Hopper)
« Reply #6 on: January 16, 2020, 09:44:26 PM »
Great stuff  :smiley:  And love seeing your in-progress texture tests  :-*

Thanks.
To be honest I was going to show more WIP as I posted along the way but thought it might be a boring to most.
Its not that its not real but it could be that its not true.

Offline Small brown dog

  • Dwelling too long on the practicalities of such things can drive you mad.
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Re: JU885z (Hedge Hopper)
« Reply #7 on: January 16, 2020, 09:55:47 PM »
CG modelling (especially 3D) is a mystical art, to me, but damn that's good! :D

Its not so much a mystery as it is a tough learning curve as far as most software is concerned - was fro me anyway.
There is usually more than one way of approaching something and knowing your toolset and what they all do is the first step. After that its like playing an instrument or some kind of sport - practice practice and practice some more and it all comes together.

I love it except for one aspect which I need to do very often. UV mapping or basically unwrapping the model so as it can be viewed in 2D space in an ap like photshop for texture mapping, bump/displacement mapping, specular map etc etc. I love what you can do when its done but I would rather eat my own ear wax than start a new UV session.

I don't always have to UV map though as I can use procedural texturing techniques and get round the need for a UV map but camo schemes and the like need a UV map. Something like the Minotaur engine was all procedural.

... sorry, gone on a bit there :)

Its not that its not real but it could be that its not true.

Offline apophenia

  • Patterns? What patterns?
Re: JU885z (Hedge Hopper)
« Reply #8 on: January 17, 2020, 11:18:43 AM »
... To be honest I was going to show more WIP as I posted along the way but thought it might be a boring to most.

To tell the truth, I have absolutely no clue how you achieve the results that you do! However, seeing your in-progress shots allows me the delusion of such knowledgeability  ;)

"Now it is 1984; Knock-knock at your front door ..."

Offline Small brown dog

  • Dwelling too long on the practicalities of such things can drive you mad.
  • Woof!
Re: JU885z (Hedge Hopper)
« Reply #9 on: January 17, 2020, 08:24:31 PM »
To tell the truth, I have absolutely no clue how you achieve the results that you do! However, seeing your in-progress shots allows me the delusion of such knowledgeability  ;)


Just about everything starts with basic primitive shapes: cube, sphere, cylinder. You have basic tools for cutting, bevelling and shaping that can be used with modifiers to help with more complex operations to give complicated surfaces.

I have no images of the very beginning of any model but I have a few early ones that are just coming out of the block out stage:



I mentioned UV mapping previously and below you can see a map with its texture along with how things can go wrong with distortion.



The distortion is hi lighted in the above by the wavy bump mapped panel.

Bump maps and displacement maps help reduce modelling all panelling and rivet details and stuff although I do chop my models up a great deal more nowadays as it helps the modelling process.



A bump map is a software/render trick and does not really effect the mesh. Its a black and white image where white is zero and black is the depth or indent determined by how much you dial into the app. The above is set at about 2mm depth if I remember correctly. You can reverse the map so that the detail is raised and the maps can be mixed as I did on the Hound to represent panels and raised rivets.

I hope this is ok posting this here.


Its not that its not real but it could be that its not true.

Offline GTX_Admin

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Re: JU885z (Hedge Hopper)
« Reply #10 on: January 18, 2020, 03:26:45 AM »
Excellent post!

 :smiley: :smiley:
All hail the God of Frustration!!!

You can't outrun Death forever.
But you can make the Bastard work for it.

Offline ysi_maniac

  • I will die understanding not this world
Re: JU885z (Hedge Hopper)
« Reply #11 on: January 18, 2020, 04:58:42 AM »
I understand nothing about graphic design. But these designs are just wonderful :smiley: :icon_alabanza:.

Offline GTX_Admin

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Re: JU885z (Hedge Hopper)
« Reply #12 on: January 19, 2020, 01:42:44 AM »
That latest one would look good with ZG.6 Wespe markings.
All hail the God of Frustration!!!

You can't outrun Death forever.
But you can make the Bastard work for it.

Offline Small brown dog

  • Dwelling too long on the practicalities of such things can drive you mad.
  • Woof!
Re: JU885z (Hedge Hopper)
« Reply #13 on: January 19, 2020, 02:31:05 AM »
That latest one would look good with ZG.6 Wespe markings.

Do you meant the 219 above ?
(I only called it a 219 as its what you get when you add 109 and 110 together)
Its not that its not real but it could be that its not true.

Offline GTX_Admin

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Re: JU885z (Hedge Hopper)
« Reply #14 on: January 19, 2020, 02:35:10 AM »
Yes.
All hail the God of Frustration!!!

You can't outrun Death forever.
But you can make the Bastard work for it.

Offline Small brown dog

  • Dwelling too long on the practicalities of such things can drive you mad.
  • Woof!
Re: JU885z (Hedge Hopper)
« Reply #15 on: January 19, 2020, 02:47:48 AM »
Yes.

You're right it would :)
That would be a nice alternative when I get fed of modelling which I do usually around the middle of a project... like round about any time soon as anything I try to do over the last couple of days has just turned to crap.
Its not that its not real but it could be that its not true.

Offline apophenia

  • Patterns? What patterns?
Re: JU885z (Hedge Hopper)
« Reply #16 on: January 21, 2020, 10:34:13 AM »
Just about everything starts with basic primitive shapes ...

Fantastic stuff and wonderful to have a peak at the earliest stages. Thanks!  :smiley:
"Now it is 1984; Knock-knock at your front door ..."