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MU13 Charlesworth

Let us all watch your new project progress.
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Scale Police
Posts: 32
Joined: 05 Nov 2017, 10:36
Location: World

Re: MU13 Charlesworth

Post by Scale Police » 10 Jan 2019, 17:27

John Vella wrote:
10 Jan 2019, 16:36
The next little job is fitting and shaping the leading edge. It is from 4ft long 6mm medium hard balsa. Aliphatic resin was used and pinned in place . The profiling started with the trusty David Plane then sanding with the butting sheet ply protected with insulating tape. The Gottingen 540 profile is pretty blunt and crude by modern day standards, but does the job and is scale. (Scale Police take note). Next the wing tips were profiled with the 0.4 mm ply blending into the balsa. The final constructional job was the root rib facings made from 1.6 birch ply, and made in 2 sections to account for the bend at the canopy cut out. On offering up the wing on its joiners the fit looked pretty good. The starboard wing including servos comes out at 38 ozs. On most of my gliders the wings weigh about half the gross weight of the complete model. So it looks like a target weight of around 10lbs might be achievable.
Noted!

John Vella
Posts: 132
Joined: 20 Mar 2017, 22:09
Location: UK

Re: MU13 Charlesworth

Post by John Vella » 18 Jan 2019, 11:13

This an update on the slow build of the MU13 wings. The problem I am finding is the time taken in reprofiling the wing ribs. The humps and bumps occur on the top rib surface only on the plans which the Laser Cutting follows exactly. The strange thing was the fuselage and empenage were very accurate, and went together a treat. I like a challenge but the time taken to reprofile the ribs is testing my patience. What would we do without the trusty Straight Edge and a good set of Glasses? Hopefully the MU13 will fly in the Spring of this Year.
Attachments
20190118_103330.jpg
Wing rib 8 is typical of the problem top surface.

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B Sharp
Posts: 522
Joined: 19 Mar 2015, 17:18
Location: Perthshire

Re: MU13 Charlesworth

Post by B Sharp » 18 Jan 2019, 11:57

John, the straight edge is mandatory but the glasses must be filled with a good malt whiskey.
Brian. :D :D :D

John Vella
Posts: 132
Joined: 20 Mar 2017, 22:09
Location: UK

Re: MU13 Charlesworth

Post by John Vella » 18 Jan 2019, 18:45

Brian a glass of Glenmorangie would not go amiss after this build. 😁😁

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