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Boeing B52 PSS Glider

BUFF is one of my winter projects

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Tim Mackey22/11/2011 23:36:22
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My main winter project is this Boeing beauty - The B52 - affectionately known as the BUFF, a PSSA / Aerotow glider from the Simon Cocker plan - which he kindly presented to me over dinner at one of our recent PSSA meetings.  Thanks Si
 
Here's Simon with his original, aging - but still terrific version. 
 

Pretty much all foam with a few ply sections for added strength, the model spans 8.5 feet, with a fuselage of around 7.5 feet, and AUW of between 10 - 14 lbs depending on how much glue is left in the bottles
Heres the main parts

This ply section is the "spine" for the front section of the fuselage - approx 4' long.
 

 
Nose cone and rear tapered section make up the total fus length. I modded the nose spine slightly to interlock with the main spine and transfer some of the towing loads when aerotowed - the towline attachment can be seen here epoxied to the spine, which will then be built up with 12mm balsa block and shaped. I have run the operating rod through to what will be the wing mounting bay, so servo can be retrofitted / maintained.
Mock up of tow release.

And the actual unit with nose spine mated to front spine.

Fuselage is EPS hollowed section and balsa veneer, with a couple of main formers in the wing mounting section.The tail feathers are also veneered foam.
 
Main work this past few days has been the engine nacelle mounting pylons - - four in all, which feature a simple but natty "break away" release system. Each pylon is in two pieces, a smaller fixed  section on the wing underside, and a larger mating section carrying the engines. made of 12mm balsa, and laminated with ply at the mating facings, these are connected together by two, friction fit, stepped locating pins ( I used carbon fibre rod and tubes ). Upon landing, should one or more engine hit an obstruction, they are "knocked off" with no damage to the main structure.
I made up ply templates first, and used small wedges to get the geometry of the pins and sockets correct. 
Here's the finished pylons, showing one in detached view - they will be sanded to final profile and covered in lightweight glass cloth and Poly-C later today.



 
I've cheated on the main wings, having elected to get them done professionally by Barry @ foamwings of Scotland, but all the rest is home spun, with a little help from my friends on the foam cutting - which I hope to get done later this week .



Edited By Tim Mackey on 30/11/2011 11:02:32

Cyclicscooby22/11/2011 23:48:07
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Are you gonna leave it as a floater, or put 4 EDF's in it, or even 8 tiny ones for proper scale..!!
Imagine the noise.. !!
 
 
Luv
Chrisie.. xx
Tim Mackey22/11/2011 23:50:53
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Would be good wouldnt it !
No plans to do so at the mo....but who knows what the future may throw up
David Ashby - Moderator23/11/2011 06:01:21
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...will it go in the car Tim?
Tim Mackey23/11/2011 09:06:58
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Yup, as Im modifying the fus to be two piece arrangement.
Wings.....just !!
Tim Hooper23/11/2011 09:19:15
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Stately, yet menacing.....
 
tim
Tim Mackey23/11/2011 09:35:48
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Thats a good description Tim - I presume you mean the model not the pilot
So...when we gonna get ya up that big rock mate?
Biggles' Elder Brother - Moderator23/11/2011 10:19:02
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Its going to get awfully crowded on top of that rock Tim
 
I'd best stay away and make room for others - its OK, I'll make the ultimate sacrifice .....put others first and all that....
 
BEB
Tim Mackey23/11/2011 10:27:35
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LOL...you're a lost cause anyway BEB
Tim Mackey30/11/2011 11:12:07
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I've tidied up and re-titled this thread now that we've had our fun on the guessing game - time to make it a proper build blog.
I have not been idle, and have now almost finished the engine pylons, and the ply work s shown above - next its foam cutting time, but I won't clog up the thread with blow by blow postings - I'll just post at the completion of each stage.
Phil Cooke30/11/2011 23:03:28
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ABS engine nacelle delivery still planned for Sunday, 8-Off - courtesy of the PSSA

Edited By Phil Cooke on 30/11/2011 23:03:59

Phil Cooke30/11/2011 23:15:15
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a little more pictorial inspiration - you might recognise this back-drop Tim
 

Tim Mackey30/11/2011 23:25:05
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Oh yes .... I can see my old house there ! Nice shot Phil...or was it Sue's
PS I take it Simon has already fitted the 8 x mini turbines he promised me too

Edited By Tim Mackey on 30/11/2011 23:28:19

Olly P01/12/2011 13:05:09
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An interesting project there Tim, I will get down the the rock next year and fly with you lot....might have to find a slope here first to learn on tho - it's a long way to go for just 10 minutes before tim chases me out of the sky.
Ian Jones01/12/2011 23:30:28
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Silently watching with interest Tim
fly boy301/12/2011 23:39:54
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Exellent flying shot Phil. Cheers FB3
Tim Mackey02/12/2011 09:37:20
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Posted by Ian Jones on 01/12/2011 23:30:28:
Silently watching with interest Tim
Nowt to report since the last posting - still awaiting my mate with his fancy CNC cutter to make it over here.
I might have a go at getting the tail end shaped up - Im thinking of using pink foam ( nice and dense - and I have a few big chunks laying around ) then laying it up with glass and resin for extra strength. I'll make it a separate removable section for easier transport and less hangar damage, CF rods and magnets should hold it on in flight.

Tim Mackey02/12/2011 10:40:12
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Found this rather interesting "tale" - groan - the other day whilst I was googling around for pictures of the tail end.
This could save me a whole lot of work and some foam

 

Edited By Tim Mackey on 02/12/2011 10:40:44

Danny Fenton02/12/2011 10:47:00
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Just goes to show this c of g myth is rubbish
Tim Mackey02/12/2011 11:03:13
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Not so - I have read the whole thing, and apparently, the pilot had to move a LOT of fuel around, and drop his rear gear to compensate for the weight shift. It stayed flying for many hours before a successful landing. I particularly liked the bit where he recalled
" after the last swipe ( it was severe turbulence that caused the damage ) I had the rudder pedal hard to the firewall, but couldnt regain control".
Not surprised mate !

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