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Re: MU13 Charlesworth

Posted: 05 Mar 2018, 20:43
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....

Re: MU13 Charlesworth

Posted: 05 Mar 2018, 21:33
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.

Re: MU13 Charlesworth

Posted: 07 Mar 2018, 08:54
by John Vella
Andy thanks for the photo. I really like your Horton flying wing as well. Regards John.

Re: MU13 Charlesworth

Posted: 11 Mar 2018, 18:42
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.

Re: MU13 Charlesworth

Posted: 20 Mar 2018, 17:10
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.

Re: MU13 Charlesworth

Posted: 20 Mar 2018, 17:46
by Chris Jesshope
Looking forward to seeing this up on the Mynd, John.

You posting from Australia?

Re: MU13 Charlesworth

Posted: 20 Mar 2018, 21:34
by Anthony
Hi John, where are you sourcing the canopy from. :!:

Re: MU13 Charlesworth

Posted: 20 Mar 2018, 23:18
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.

Re: MU13 Charlesworth

Posted: 02 Apr 2018, 15:23
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.

Re: MU13 Charlesworth

Posted: 27 Apr 2018, 15:17
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.