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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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Stephen Jones20/11/2011 18:36:29
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Hi Tim ,
 
A Very high standard of work as usual, you really think it all through and make it all look so simple while doing it .
Tim Hooper23/11/2011 12:34:33
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Thank you, Stephen!

The fuselage is taking shape now. The sides are cut from 1/4 sheet with a square upper longeron, and a large triangular bottom member.

 
With the lower CS pinned securely to the board over a drawn centreline, the sides are glued in place.
 
The stern ends are drawn together. I sprayed water on the outside of the sides to help them curve inwards. I also found it helpful to make saw cuts along the triangular longerons as well!
 

What I hadn't banked on was that because of the sloping sides of the model, as I pulled the rear ends together, they rose by a few millimetres.

tim

Danny Fenton23/11/2011 12:46:23
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Oh dear, is that going to be an issue Mr H?
 
D
Tim Hooper23/11/2011 13:22:37
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I don't think so Danny.
 
 
My main fear was that it would give the tailplane some negative incidence, but a rise of 5mm over a distance of 700 mm (the distance between trailing edge and starnpost) means an incidence change of about .5 degrees - not a major issue.
 
The alteration to the appearance of the model won't even be noticeable.
 
I think my main concern was that my carefully contrived arithmetic wasn't all that carefully contrived after all ......
 
tim
Tim Hooper25/11/2011 13:25:01
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Onwards!

More definite progress with the addition of the rear formers (all 3mm liteply).

 
Seems almost straight.....
 
I to admit that considerable amount of grunt (plus sprayed water, clamps and internal knife slits) were needed to pull the fuselage sides in meet F3 at the front.
 


 
Tim Hooper25/11/2011 19:55:45
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Would you believe that there's a full-size B2 fuselage for sale on eBay?
 
I kid you not......
 
 
Sooooo.....anybody lend me a quid or two?
 
tim
Tim Hooper27/11/2011 19:40:38
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Rather a leisurely day as befits the weekend!
 
Got the routing for the fuselage snakes sorted out.
 
After that I re-pinned the fuselage back to the board, and then made a little jig to lift F1 13mm clear of the board.....

....prior to adding the sides of the nose.

Danny Fenton28/11/2011 09:53:41
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Looking really good Tim

Was surfing loooking for pics of BEB's Elf free flighter and spotted this, future project? The struts look interesting to say the least....

Its a Parnell Elf, btw
 
Cheers
Danny

Edited By Danny Fenton on 28/11/2011 09:55:03

Steve Hargreaves - Moderator28/11/2011 12:05:35
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So its true.....you DO have to wear a white boiler suit before you can touch old aeroplanes.....
 
Or is it an extra in CSI Old Warden??

Edited By Steve Hargreaves on 28/11/2011 12:05:55

Danny Fenton28/11/2011 12:16:02
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CSI Old Warden, that could be catchy.....
 
Perhaps they all have a boiler suit OCD
 
Found another shot of the Elf, look at the aileron controls, torque tubes......
 

Sorry Tim, babbling all over your thread......
 
Cheers
Danny

Tim Hooper28/11/2011 14:40:07
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The Elf was already spotted by a certain nameless blonde some time ago......
 
Must admit, it does tick quite a few boxes!

tim
Tim Hooper30/11/2011 20:56:29
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The Turnigy 42-60 outrunner ( a refugee from the Fenton Home for Dispossessed Motors) meets its future home - F2.
 

F2 is laminated form two layers of ply. I cut the front face from 1/16 ply, and fettled it to fit within the nose, then added the rear layer of 1/4 ply when all the fiddly stuff had been done.


Once happy with the general fit I added some tough balsa block where F2 meets the fuselage sides.
 
After a bit of thought, I added two stringers to the top of the fuselage formers to provide an anchorage for the top edge of the shoulder sheeting which has been glued to the fuselage sides at its lower edge only.
 
 
Hopefully tomorrow I'll be able to dampen it, and curve it over the tops of the formers.
 
tim
 
Steve Hargreaves - Moderator01/12/2011 13:51:43
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Posted by Tim Hooper on 30/11/2011 20:56:29:
The Turnigy 42-60 outrunner ( a refugee from the Fenton Home for Dispossessed Motors) meets its future home - F2.
 
I'd keep your ear to the ground Tim if I were you..there might be more available soon at a bargain price......rumour has it that Mr Fenton is so taken with the mighty PAW in his Mam'selle that he's getting out of electric flight altogether, growing a bushy beard, filling his wardrobe with woolly cardies & buying lots of diesels instead.....
 
Ssshhh!! Don't mention I told you will you....
Danny Fenton01/12/2011 14:14:01
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Mmmmmm
Tim Hooper03/12/2011 16:10:48
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Steve,
 
You think we're losing My F to the Oily Side? Blimey.......

Back to the blackburn;

I wasn't able to curve the shoulder sheeting over in one piece, and had to cut it into three sections in the end. No matter.

I thought it would be a good idea to see if the extra thickness of the sheeting has affected the fit of the cabane strutworks.

 
No problem as it turned out, so Now I can add the top decking from a sheet of 1/2 " soft block.
 

With a fair amount of cutting and filing, I've managed the persuade the hub of an MA 14x8 prop to squeeze into a 1 3/4 ali spinner, so now I can press on with the top hatch and front of the cowl.

tim
Tim Hooper05/12/2011 09:13:16
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The 1/2" top decking is now fitted, and hacked into some sort of shape.
 
The cockpit opening has been hewn asunder....
 

......oh, and I've daubed some filler over the more obvious gaps!
 
tim
Danny Fenton05/12/2011 09:27:49
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GAPS!!! That's very unlike you Tim, surely a typo? irregularities in the grain perhaps?
 
Looking very nice, and the motor is in a much better home now
 
Oh and do you happen to have a three view of that Elf.........
 
Cheers
Danny

Edited By Danny Fenton on 05/12/2011 09:28:40

Tim Hooper05/12/2011 09:48:54
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Posted by Danny Fenton on 05/12/2011 09:27:49:
GAPS!!! That's very unlike you Tim, surely a typo? irregularities in the grain perhaps?
 
 
Grain irregularities looking very much like the misplaced cut of a 10A scalpel blade!
 
3-view of the Elf? Now, you know that I don't even consider choosing a future build until I've finished the one I'm currently doing! Except for the scaled-up Clean Sweep.....oh, and the 1/3 scale AW Quadruplane, of course....
 
tim
Danny Fenton05/12/2011 09:55:37
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There was a free plan of the Elf, but it was nowhere near accurate for our particulr CDO
Ah well just a thought.........
Tim Hooper07/12/2011 13:38:12
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It's that CDO again....

I've started on the front hatch this morning. A bit of Sellotape stops it sticking to the fuselage during fabrication. It occured to me that adding the occasional 1/8" BBQ skewer to the planking would stiffen the assembly up considerably. I may skin the whole thing in 1/64 ply as well. We'll see.....

 
After searching the net for quite a while for suitable oleo/damper/thingies, I set about making my own! A length of 3/16 brass bar, some matching tube, a couple of springs, etc.
 
Add a couple of hours sawing, filing, soldering, drilling and tapping, and here're the finished items!

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