Inch Worm - Sephton's 2016 Christmas Build

The basic tip construction was completed this morning. I'd cut the main spars slightly oversize, so I had to do some planing.....very therapeutic it was, too:



Jaqui's jigsaw is going well, too!

Come on Andy, Jaquie is winning !!!!!!!!

Garry

im lost now but impressed and its going so well

Here's the current status:





I've done all I'm going to do in the short term. I'm aiming to get her

flying in the summer, so I'll come back to it in the spring

Just a thought Andy Are you keeping to the FAI weight ruling? If not I suggest moving the wing back about 20/25 mm to avoid the huge amount of lead needed in the nose

one tenor wrote: Just a thought Andy Are you keeping to the FAI weight ruling? If not I suggest moving the wing back about 20/25 mm to avoid the huge amount of lead needed in the nose

If I did that John, then it wouldn't be an Inch Worm.......

Andy Sephton wrote:

one tenor wrote: Just a thought Andy Are you keeping to the FAI weight ruling? If not I suggest moving the wing back about 20/25 mm to avoid the huge amount of lead needed in the nose

If I did that John, then it wouldn't be an Inch Worm.......

You are right of course . I forgot you like to keep things original

Andy Sephton wrote:

Neither the Caprice, nor my reduced scale model, featured a twist in the training edge at the tip. Whilst it's, perhaps, not sound aerodynamically, it did produce models that performed well. I'll be using similar on the Inch Worm as I don't believe any of the original models featured a twisted TE either.

What I finally decided to do was jig up the ribs to keep the mainspar horizontal, then jig up the training edge to suit. After dry fitting the ribs, I shaved off the balsa not required. So far, it appears to have worked.

I built one of these when I was 15 and I never really fathomed out how that TE was supposed to be assembled at the wingtip. Mine had a rock hard balsa fus as well - it was way too heavy. Never really flew that well

That on the other hand, looks very nice

It's about time I got this one finished ... although it'll now be for next year's competitions rather than this!

The single rib at the dihedral joint is at an angle to the respective wing panels. So, as a CAD exercise, I scanned in a rib, traced it, worked out the angle of the dihedral joint, expanded the rib shape in the 'Y' direction to suit, and plotted the result. I now have a pattern to cut the 2 dihedral joint ribs to the right depth.