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U-2 Dragon Lady

"A dance with a lady or a fight with a dragon" 117" span Jack Lynn Bale plan

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Chris Barlow01/10/2017 21:22:54
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1648 forum posts
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Light tail! wink

If it needs weight in the nose that'll take the form of cocpit detailing and possibly a nice pilot and chair!

Wing cores are now cut ready for cutting the spars and wing tube in tomorrow hopefully.

Chris Barlow12/10/2017 23:18:41
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A bit done on the wings this week.

Foam cores cut in 2 sections with a hot wire. The root half is just over 50mm thick so a second piece of foam was added and glued to the lower section after cutting.

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Holes also bored out for the wing tubes with 22mm copper tube and 12mm Ali tube with a saw edge filed into the ends. Two 1/2" x 1/8" Spruce spars were cut into the foam top and bottom with a hot wire bent to profile and run down a straight edge. The spars sit alongside each other at the tip end and are glued into the cores with PU adhesive. When the Phenolic tubes are glued into the wing then will connect to the spars at the outboard end too.

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The skins are 1/32" Obeche and were cut to shape and taped together Making sure to produce 2 handed pairs. These were glued with a PU flooring adhesive. I use CaberFix D4 which is for chipboard flooring available from Travis Perkins and around £16 per big bottle.

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With 2 skins glued and the foam core sandwiched between them the core was weighted down with custom weights over 24 hours. In contact with air the D4 hardens in about 20 minutes but would still be wet between the foam and skin for a while longer.

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Same procedure for the second wing againg left for 24 hours to harden the PU inside. Once both wings were out of the moulds the edges were trimmed and sanded and are now ready to be lipped with balsa.

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You can see where the PU D4 has forced it's way through the joint in the skins and was contained by the packing tape used to joint the sheets. This is how the sheets are glued together on edge without actually gluing the sheets together! Also note the Obeche sheets are parallel to the leading edge on top of the wing and parallel to the trailing edge on the bottom of the wing to create a slight cross ply effect. Something I read about on a JP build blog I think!

john stones 112/10/2017 23:34:42
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8567 forum posts
1358 photos

Those look good Chris. yes

Chris Barlow12/10/2017 23:40:11
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1648 forum posts
1138 photos

Shed's full now though John! They're nearly 1.5m long and 440mm at the root each! The Fuzz is hanging above them at around 60" long!

laugh

Edited By Chris Barlow on 12/10/2017 23:40:57

Edited By Chris Barlow on 12/10/2017 23:41:23

john stones 112/10/2017 23:48:04
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8567 forum posts
1358 photos

Build it in your bedroom, she'll not mind. face 1

Chris Barlow15/10/2017 01:30:06
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1648 forum posts
1138 photos

Dangerous territory there John. She doesn't like it when I bring the toys in to cut decals for them on the kitchen table! surprise

A bit more done over the last couple of days. Leading and trailing edges glued onto the wings...

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And the beginnings of a tail plane. This too may go off plan as I might make it removable for storage. At 29" span it is at risk of getting snagged in the hanger!

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Phil Cooke15/10/2017 07:49:45
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1854 forum posts
1195 photos

Great progress Chris, nice to see you cutting and skinning your own panels - impressive! thumbs up

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