Jump to content

The Ohmen


EarlyBird
 Share

Recommended Posts

A ruler helps to position the sheet.

 

IMG_20231221_113033.thumb.jpg.3117a1e6e1db33b2e74832f47384d725.jpg

 

Damp the top of the sheet to help it bend and while it soaks in apply the glue, no rush, then lay the sheet in place and hold down with weights.

IMG_20231221_115119.thumb.jpg.11f64e777a12d49e1255c68dc9c7c811.jpg

 

I used a 600 mm Permagrit for the leading edge, with the rough side down it stayed in place even close to the edge.

IMG_20231221_115145.thumb.jpg.911a5b626304b2cf94b5427daee3f3d9.jpg 

 

After a few minutes I moved the ruler and used 1/16" scrap to balance the wood block and batteries close to the back edge and the Permagrit as far forward as possible, adding a bit of hand pressure just to make sure.

 

Here it is with the weights removed.

IMG_20231221_140443.thumb.jpg.aff121d117fd6fd3446616ad4b532cba.jpg

 

IMG_20231221_140526_1.thumb.jpg.50549484d411699517320b67ff7cebfc.jpg

 

Looks and feels good to me.

 

Top cap strips next.

 

Steve

  • Like 2
Link to comment
Share on other sites

Sanded LE and tip rib then set up a 1/4" jig.

IMG_20231223_140603.thumb.jpg.b3abfab00d65d504be49d637cb3c3d1e.jpg

 

Using a piece of 1/4" spruce for the width of the cut.

IMG_20231223_140540.thumb.jpg.e4e73e7c60d7ad4b06cfe0a76fa4efea.jpg

 

The length of the cap strips was a consistent 119.5 mm so I cut a piece of scrap 1/16" exactly to this length then used the jig to cut eight strips and glued in place.

IMG_20231223_140326.thumb.jpg.76b234eb94d47ace83e60f63c53c7502.jpgIMG_20231223_140421.thumb.jpg.02714486f9da8f77ec724468ef31f825.jpg

 

and after some sanding here we have it.

IMG_20231223_144110.thumb.jpg.ee85c4ced7da6c1a60b733872ba3a62f.jpg

 

I must be learning.

 

Next, I cut the bottom strips and at that gave up for the day.

 

Steve

 

 

  • Like 1
Link to comment
Share on other sites

Alot of shaping and fitting over the last few days.

Starting with the LE and top spar then the TE,

 

IMG_20240101_101640.thumb.jpg.1dcbdf97ddfe62477c82c071dccc221e.jpg

 

I use the David Plane to start, just catching the ribs.

IMG_20240101_101653.thumb.jpg.27d4a7d25eca76f114936fee0f06b088.jpg

 

Then use the Perma grit block to finish, again just catching the ribs and removing the burnt wood.

IMG_20240101_102741.thumb.jpg.1453ddf9a537b769d4f693cb2201f305.jpg

 

We now come to the tricky bit of joining the wings. With the wing propped up 1 1/2" then the join is test fitted.

IMG_20240101_104032.thumb.jpg.12dcec2681218f93a91f01529905c900.jpg

 

TLAR, after lots of careful sanding and test fitting.

Next is to glue it together then finish the top LE and the rest, including the cap strips.

 

Steve

  • Like 1
Link to comment
Share on other sites

TE is next so add the scrap balsa first,

IMG_20240107_120048.thumb.jpg.2f1a04c9f3f8962e78e32723161e3ca4.jpg

 

Then using the LE offcut which will fit perfectly.

IMG_20240107_120343.thumb.jpg.16a47b97fac54deb62e5f47370674589.jpg

 

or maybe not, I must have cut the wrong side of the line. 😞

 

Only thing to do is cut another one.

IMG_20240107_132644.thumb.jpg.ae6ff063e72451c2bf5bd7c6eb9dae34.jpg

 

and use a ruler for a straight edge so that the rib cap strips are 119.5 mm to match the first wing.

 

Steve

Link to comment
Share on other sites

Which brings us to the top centre sheeting.

I make this from two pieces of balsa fitting tp the LE and TE respectively.

IMG_20240107_150804.thumb.jpg.63dc43714e644f5c7ea85797ec1eeed7.jpg

Then using a sharp pencil mark the cut line.

IMG_20240107_150826.thumb.jpg.0af473ca14cf693df0cc24c7e8cb78e6.jpg

 

Cut on or to the correct side of the line. 

 

 

 

 

Edited by EarlyBird
Link to comment
Share on other sites

I check the fit and when happy (TLAR) tape the top.

IMG_20240107_151845.thumb.jpg.8f46b8664ff617343ea85cd74549462f.jpg

 

Turn over and tape the full length which will form a hinge.

IMG_20240107_151904.thumb.jpg.278f51608439bcac0d1cad4598bf883d.jpg

 

Turn over and remove the temporary tape which will enable the hinge to be opened for glue.

 

When glued it will look like this

IMG_20240108_092645.thumb.jpg.4cf3ec2df04809700795f593e519d8f4.jpg

 

and fit, we hope.

On the back draw the lines for the desired shape.

IMG_20240108_092710.thumb.jpg.cbb339667a5e003c1164155472defaff.jpg

 

and cut. I also score along the centre line.

When happy glue it.

 

Steve

  • Like 1
Link to comment
Share on other sites

Next is the bottom sheeting but first the paper tube,

IMG_20240112_095556.thumb.jpg.370da793704559d87f9cfb326d2e640c.jpg

 

Then repeat the process used on the top sheeting.

IMG_20240112_095655.thumb.jpg.e8e798b5e076760a94b463e3ff5b7c4f.jpg

 

The hinge opened up and glue applied.

IMG_20240112_100039.thumb.jpg.cfdbe6eef5a4408d3300312f3a368c94.jpg

 

Close the hinge and wipe off the excess glue then place on a flat surface and weight down with anything heavy and to hand.

IMG_20240112_101116.thumb.jpg.8aba5de434d4d951e7db70ce988f4dbe.jpg

 

Soup for lunch now I have taken it out of the cupboard above, which was to hand.

 

While the glue dries I can have a cup of Tea.

 

Steve

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...