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MU13 Charlesworth

Let us all watch your new project progress.
Geoff Pearce
Posts: 432
Joined: 18 Mar 2015, 09:11
Location: SN11 9EE

Re: MU13 Charlesworth

Post by Geoff Pearce »

John Vella wrote:
05 Mar 2018, 18:02
Hey Geoff steady on I think at 71 I am just getting into my stride as far as balsa bashing goes. It is most enjoyable when it is freezing outside to balsa bash in a really warm model room. It is also sound proof so I can't be disturbed by the "boss".😁😁
Hi John, I know what you mean, I'm also 71........The comment was meant for Roo....

John Vella
Posts: 208
Joined: 20 Mar 2017, 22:09
Location: UK

Re: MU13 Charlesworth

Post by John Vella »

Andy A wrote:
05 Mar 2018, 20:40
Looking Good Any ideas on colour and finnish yet?
Andy at the rate I build the decision of the colour scheme is some way off. What scheme is your MU13 ? Have you any photos ? Regards John.

John Vella
Posts: 208
Joined: 20 Mar 2017, 22:09
Location: UK

Re: MU13 Charlesworth

Post by John Vella »

Andy thanks for the photo. I really like your Horton flying wing as well. Regards John.

John Vella
Posts: 208
Joined: 20 Mar 2017, 22:09
Location: UK

Re: MU13 Charlesworth

Post by John Vella »

Fuselage build nearly done. One tricky bit was the repositioning of the diagonal uprights to accommodate the curve of the side stringers between F6 and F7. The side stringers were 4 by 6mm pine from Wicks some 5ft long. The spreaders were 6 by 3mm hard wood slotted into the diagonals. All joints have 0.4mm ply fillet reinforcements. Wing centre box work and sheeting to follow next to complete the fuselage.
Attachments
The diagonal upper joint moved in board.
The diagonal upper joint moved in board.
All 0.4 ply fillets fitted with thick cyano glue.
All 0.4 ply fillets fitted with thick cyano glue.
More construction detail.
More construction detail.
Curve of side stringer running to nose.
Curve of side stringer running to nose.
Underneath detail of structure.
Underneath detail of structure.

John Vella
Posts: 208
Joined: 20 Mar 2017, 22:09
Location: UK

Re: MU13 Charlesworth

Post by John Vella »

Here is the wing centre box work on the MU13. Ply doublers used on the flat plate joining boxes. The main joiner is 15mm by 2mm steel, and the wing incidence joiner being 10mm by 1mm steel. I have fitted a ply cross brace at the back of F5 to reinforce the corner joint and act as a base for the front of the 5mm top balsa sheeting. The centre sheeting will be covered by 0.4 ply skin to blend in with the wing skin covering when the wings are built. It is a slow but enjoyable build so far.
Attachments
Ply doubler and F5 front cross brace.
Ply doubler and F5 front cross brace.
Centre section 5mm balsa sheeting in place.
Centre section 5mm balsa sheeting in place.
View with brass centre box fitted.
View with brass centre box fitted.
View of incidence box,10by 1mm , with doublers.
View of incidence box,10by 1mm , with doublers.

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Chris Jesshope
Posts: 36
Joined: 24 Jan 2017, 16:13
Location: Shropshire

Re: MU13 Charlesworth

Post by Chris Jesshope »

Looking forward to seeing this up on the Mynd, John.

You posting from Australia?

Anthony
Posts: 130
Joined: 18 Mar 2015, 21:39

Re: MU13 Charlesworth

Post by Anthony »

Hi John, where are you sourcing the canopy from. :!:

John Vella
Posts: 208
Joined: 20 Mar 2017, 22:09
Location: UK

Re: MU13 Charlesworth

Post by John Vella »

As Cliff says the canopy is built up from sheet material and a metal frame. The 4th photo should be the rear view of the incidence flat plate box and ply doublers.
Rear view of incidence flat plate brass box.
Rear view of incidence flat plate brass box.

John Vella
Posts: 208
Joined: 20 Mar 2017, 22:09
Location: UK

Re: MU13 Charlesworth

Post by John Vella »

After a break the build continues with the Empennage , another clever light weight Charlesworth design. The ribs on the tail needed a bit of work. The ply doubler is capped by 1.5mm sq spruce and the same is used to support the rear shroud. The lightening cutouts were filled with 1.5mm soft balsa to support the ribs and seal the tailplane against the elements, the weight being negligible. Now it's ready for 0.4mm ply sheeting and LE capping.
Attachments
Tips balsa ply balsa sandwich
Tips balsa ply balsa sandwich
Carbon spacer for 4m bolt mounting fitted.
Carbon spacer for 4m bolt mounting fitted.
Front view with doubler and spruce strips
Front view with doubler and spruce strips
Rear view and ribs
Rear view and ribs

John Vella
Posts: 208
Joined: 20 Mar 2017, 22:09
Location: UK

Re: MU13 Charlesworth

Post by John Vella »

The next job was the elevator hinges. They were cut and laminated from pieces of 1.5mm Epoxy board. The pins are 2mm steel and a key step made to locate the hinge in position in the slot on the tail spar. The pins are glued in a slot in the rear of the elevator spar. The elevator was fitted on hinges on the tailplane for final profiling. The rudder was built next in a traditional balsa ply balsa sandwich. The ply was laminated from 2 pieces of 0.8mm ply. The rudder spar from 13mm×20mm medium hard balsa.the ribs from 2mm medium hard balsa. The construction was a fiddle but the weight was very light at 1.5 oz complete awaiting its pintle hinging.
Attachments
Glass hinges
Glass hinges
Rudder basic structure
Rudder basic structure
Rudder complete
Rudder complete
On electronic balance at 1.5ozs.
On electronic balance at 1.5ozs.
Tailplane jigged for profiling.
Tailplane jigged for profiling.
Rudder basic components
Rudder basic components

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