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B24 Liberator - 1/12th scale PSS

From CAD to slope

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Danny Fenton29/10/2014 09:43:51
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9106 forum posts
3945 photos

Hi Andy, lovely work, I so wish I could come to terms with 3D cad.

I am probably totally wrong here, but those fins look massive, is that correct?

Cheers

Danny

Monz29/10/2014 09:57:11
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545 forum posts
26 photos

Looking good.

I have this 3 view if you'd like to compare accuracy. It has the formers too

Andy Meade29/10/2014 10:17:02
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2610 forum posts
679 photos

Ha! Fancy coming up with the goods afterwards like that Monz! Yes, it does show the front formers with no angled "vee" at the bottom, which is what I have worked too.

Danny - every time I open it, I think the same thing! I think it's a visual thing, as there is so much wood in them at the moment compared to the fuselage. I will do a sanity check though against a scaled side view to keep us both happy. It does look odd. They must have had superb rudder authority cool

Andy Meade29/10/2014 10:24:17
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2610 forum posts
679 photos

Oops blush Fin height should be 312mm...I have 381mm.

Andy Meade29/10/2014 10:38:22
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2610 forum posts
679 photos

Nothing to see here, honestly cool

(Corrected fin size - was 118% of required scale, thanks Danny blush 

b24 fus assy 21.jpg

Monz29/10/2014 10:42:27
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545 forum posts
26 photos
Posted by Andy Meade on 29/10/2014 10:17:02:

Ha! Fancy coming up with the goods afterwards like that Monz! Yes, it does show the front formers with no angled "vee" at the bottom, which is what I have worked too.

Danny - every time I open it, I think the same thing! I think it's a visual thing, as there is so much wood in them at the moment compared to the fuselage. I will do a sanity check though against a scaled side view to keep us both happy. It does look odd. They must have had superb rudder authority cool

Just ask next time laugh

I have thousands and thousands of three views and references saved.

Danny Fenton29/10/2014 10:44:50
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9106 forum posts
3945 photos

Lol no worries still look massive in the corrected shot embarrassed being a pain I know and please tell me to bog off but it still doesn't look right somehow, the fins look right compared to the fus, its the wing and nacelles that look too small perhaps? is it worth checking a few other dims, perhaps the span?

Could of course just be me, I am not that familiar with the "Libby"

Cheers

Danny

Andy Meade29/10/2014 10:58:01
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2610 forum posts
679 photos

Danny - always happy to receive comments before I finish painting laugh at least I can correct it then.

The wing and tail span are both a little stretched, but funny you should pick up on the nacelles. They are shrunk to about 90% of true scale at the moment, mainly to reduce the cross sectional area. The reasoning behind this, is specific to a sloper - I am already pushing a great big box through the air, and I have no motive power of course to drag the model forward. On windier days, I don't want to be struggling for penetration, is what it boils down to.

The wing is less bulky as I have definitely not used the scale section - look at Monz's plan up there - it's huge! Again, no way I could live with that on the slope, so I am using an Eppler 205. I may re-visit it and thicken it ever-so-slightly to lessen the effect of it looking like a thin blade of a wing when head-on, but I'm not sure on how well that section behaves to being fatter just yet.

Oh, another point on the wing - don't forget she hasn't got her tips on yet, so will definitely look shorter in that respect. I posted this overlay image on page 1, and you can see I'm relatively close to scale for the planform overall :

b24 fus assy plan view.jpg

Danny Fenton29/10/2014 11:08:43
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9106 forum posts
3945 photos

Ahh yes I remember seeing the overlay, sorry forgot about that embarrassed The reduced frontal area of the nacelles makes sense, and perhaps the thinned wing section is what I am seeing? Glad you are all okay then and its just me.

I really look forward to seeing this come together, you need parts!

Cheers

Danny

Matt Jones29/10/2014 11:22:23
1186 forum posts
1 photos

It's fake! The shadows are all wrong!!! cheeky

Andy Meade29/10/2014 11:31:46
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2610 forum posts
679 photos

Have you cut those parts for my Sukhoi yet Jonesy? cool

Andy Meade29/10/2014 11:31:46
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2610 forum posts
679 photos

oops duplicate, please delete

Edited By Andy Meade on 29/10/2014 11:33:52

Andy Meade30/10/2014 15:16:52
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2610 forum posts
679 photos

Well that was a fun few minute's modelling!

b24 fus assy 22.jpg

I now have a ball turret - this will either get sent off to be 3D printed by RMP, or made in balsa if I'm feeling particularly masochistic (also known as Jones-like). The turret will of course retract, as per full size. I thought she'd look odd in the air without one, but didn't fancy landing on it either.

On the subject of scale details - I figured out a way of doing the "shuttered" type of bomb doors that the Libby sported, but just couldn't figure out a way of doing it without 4 servos; light; easily repairable; or reliable, all in 12th scale. I still want an operating bomb-drop, so will be installing something simpler, as per Lancaster - just hinged, opening doors, but 4 off on the Lib - 2 front and 2 rear. If it was 10th scale, I could probably get it in there. Maybe for the electric version, if I do one.

Rudders are now done but they aren't very interesting - that's it for today probably.

Edited By Andy Meade on 30/10/2014 15:17:38

Andrew Price 230/10/2014 17:07:06
815 forum posts

Andy. This is going to be a great model. Good luck with the build, I shall be following with interest.

Stevo30/10/2014 17:11:39
2699 forum posts
419 photos

Oh wow, why haven't I seen this before??

SUBSCRIBED yes

Andy Meade30/10/2014 18:08:19
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2610 forum posts
679 photos

Welcome along guys, the more the merrier!

Phil Cooke30/10/2014 19:12:16
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2254 forum posts
1539 photos

Whats the life expectancy of the lower turret gunner when operating from the slope without wheels - I wouldn't fancy his job!!  Does it really fully retract on the fullsize??  Cool!

Edited By Phil Cooke on 30/10/2014 19:13:26

Andy Meade30/10/2014 20:42:23
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2610 forum posts
679 photos

Indeed it does! Because the main undercarriage is in the wing, the length of the legs is limited. That means the belly is quite low to the ground when she's on her wheels, and the ball must retract for clearance. There is even a skid in the aft section of the fuselage that is lowered upon take off to stop the pilot scraping the under side too much!

Here you can see the ball turret (or not) sucked up into the belly, and the skid lowered :

Andy Meade31/10/2014 20:00:42
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2610 forum posts
679 photos

One more turret..

b24 fus assy 23.jpg

Two more turrets :

b24 fus assy 24.jpg

Some hardware to add under the top turret now. It's great working on the laptop doing CAD work whilst the missus watches rubbish on the TV!

Tony Bennett31/10/2014 22:33:31
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5075 forum posts
129 photos

smashing.

i have to learn cad.

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