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Blackburn B2 - a 30's bipe with a whole lot of shiny bits!

1/5.5 scale, 65

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Tim Hooper08/10/2011 20:22:19
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Looks like the coming winter's project has finally chosen itself!
 
A few weeks back we journeyed down to Old Warden to have a peek at the rather photogenic Blackburn B2 - resplendent with silver doped wings, a polished aluminium fuselage and light blue struttery. Looks absolutely wonderful on the ground - and even better in the air!
 
So this 79 year old trainer still gets to loop and roll for the benefit of the watching crowd.....
 
So I was able to get some nice detail shots as it awaited its turn to fly...
 
.
.....as well some overall views....
 

 
 

Looks like the die is cast then!

tim
 

Edited By Tim Hooper on 08/10/2011 20:22:38

Tim Hooper08/10/2011 20:31:39
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A word in the right ear on the scale-biased forums saw several 3-views arrive in my inbox in short order, the best one being this one by Dennis Bryant.
 

So out came the crayons and calculator, and away we go!

The upper and lower wings are virtually identical, although only the lower surfaces are fitted with ailerons.
 
Profili software generated a nice 12% Clarke aerofoil, and I've drawn in the spars etc.
 
The tailplane is set to be made out of 1/4" stripwood with 1/8 capstrips to give it some thickness.
 
As soon as I've roughed out the spars, I'll take a look at that deceptively curvaceous fuselage!
 
tim
 

Edited By Tim Hooper on 08/10/2011 20:43:08

Tony Bennett08/10/2011 21:08:35
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4768 forum posts
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very nice.
i like bipes.
Alan Cantwell09/10/2011 11:32:17
3039 forum posts
many on here know i work with one of the best of the ARTF importers, but its guys like you that make this hobby for me, going to look in on this, and look forward to watch it grow from creation, to its first flight, can i ask, what are you going to do about that highly polished ally? litho? there was a lot on ebay this week
Ton van Munsteren09/10/2011 11:50:52
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Hi Tim,
 
Was looking out for you making a start on this plane so will be following your every step.
 
Enjoy the design and build of this model and Iam looking forward to lots of pics.
 
Ton
Tim Hooper09/10/2011 11:51:35
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Alan,
 
Thanks for the encouragement! The plan is to build the fuselage from balsa sheet, and then tissue and dope it to provide a suitable base for a layer of Flair Aluclad. This is the self-adhesive film I used on the cowl area of the Cygnet.
 

It's a very malleable material, and can conform to gentle compound curves with a simple burnishing. Luckily the B2's fuselage is multi-panelled, so I'll be able to apply it in quite small sections - although I will have to apply it after those oh-so-prominent strakes have been added. Mind you, first I have to decide on the actual fuselage structure itself!

tim
Ton van Munsteren09/10/2011 11:53:12
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By the way what a great 3view that will be a great help designing the Blackburn.
 
Ton
Ton van Munsteren09/10/2011 12:15:52
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Tim,
 
To me a tisseu and dope finish would be to soft and you will have easily dents during transport on the model specialy with such a big surface of alu finish.
I would use a 25gr glass finish on my models which make it a little less vulnerable.
Well we are still a long way from there but always good to take a look on the options.
 
Ton
Steve Adams09/10/2011 14:43:33
175 forum posts
HI Tim,
Another interesting subject you have there,looks a little like a Stampe bipe.As regards to when you do cover how about nylon stockings,covered in dope? Read it in a mag AMI Along time ago,gives a nice light and durable finish!
 
Regards Steve.
Tim Hooper09/10/2011 17:23:28
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Posted by Ton van Munsteren on 09/10/2011 12:15:52:

I would use a 25gr glass finish on my models which make it a little less vulnerable.
Well we are still a long way from there but always good to take a look on the options.
 
Ton
 
 
Good thought Ton!
 
I do have a sheet of 25g cloth squirrelled away in drawer, but I'd go for WBPU as a resin instead of epoxy. Mind you, the weave would still need a fair bit of filling first, wouldn't it?
 
Steve, Nylon stockings? You should be ashamed of yourself!
 
tim
 
 
Danny Fenton09/10/2011 17:58:42
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I was wondering if this would be the next project after seeing all the photographic attention you gave it at Old warden. Nice one Tim, should be another cracking model, and at a nice size too

Cheers
Danny
Ton van Munsteren09/10/2011 18:42:53
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Tim,
 
Iam also using PU in stead of epoxy and that works just nice. Iam using a thin brush to apply the PU in about 3 layers very thin and good brushed out so there is no shinny surface shown when brushing. Its about the same as with tisseu use to much and the paper will start to float and all the PU will be sucked in the wood and is of no use for the glass and makes it more heavy. The only thing I use the glass for is to make the surface tough nothing else.
 
Ton
 
Tim Hooper10/10/2011 17:50:32
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Ton,
 
I think the trick with WBPU is to apply a couple of thin coats of dope to the bare wood first to seal it, and prevent it soaking up too much WBPU.
 
I've also been directed to Mick Reeves own site. He sells ali sheet at far cheaper prices than the Flair product..
 
Danny, You know me too well it seems........
 
tim
Tim Hooper11/10/2011 20:23:18
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More scribbling has seen the fuselage sort of faintly roughed out.
 
More detailed is the fin (tiny) and rudder (enormous....);
 
 
The fiddly part starts with trying to work out the fuselage cross-sections. I'm opting to use generously thick balsa for the sides and turtle deck, and then sand to an appropriate shape afterwards.
 

 
tim
Ton van Munsteren11/10/2011 20:31:31
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Hi Tim,
 
Great seeing the drawing grow but why not do the sheeting in total with 3mm.
 
Ton
Tim Hooper12/10/2011 07:06:56
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Thanks Ton!
 
I'd sort of painted myself into a mental corner there, hadn't I? I'll have a rethink.....
 
tim
Lee Smalley12/10/2011 10:17:55
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It's a metal tiger moth!!!!!
andy watson12/10/2011 18:00:48
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Tim, if you drop me your address I can send you a corner of Mick Reeves self adhesive aluminium sheet if you want to look at it before you buy.
 
I was going to suggest it but saw someone beat me to it. I remember when I used it (can't remember on what) I thought it was a bit fragile.
 
I would be interested in knowing some of those scale based forums you mentioned- but better stick them in the PM too!!
 
I will leave everyone else to praise your building skills- I think you have a great talent for picking interesting subjects. (That sounds like an insult, but it is meant as a complement!)
Tim Hooper12/10/2011 20:07:10
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Andy,
 
PM sent with my address.
 
The 'other' scale frums are no secret though;

RCSB You'll need to register for this one to gain access
 
RCMF Scale Modelling Research forum
 
RCG The Scale Electric section of the mighty RC Groups
 
tim
 
 
 
andy watson12/10/2011 21:28:46
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I was just interested to see where you looked. RCSB is one of my favourites, but I don't use it enough to justify paying for it. Unfortunately I didn't realise I only had a few free posts, and squandered them recklessly!
 
Cheers Tim

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