Big Stik 80

Big Stik 80

Postby tigger » Sun Sep 04, 2016 8:11 pm

Hi there, i started a Big Stik build using a short kit from Laser cut Australia a while back but have been somewhat slack insofar as posting so will endeavour to get up to the present part of the build.

plans and parts in the kit.
Cheers Tigger
Attachments
big stik 005.jpg
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Re: Big Stik 80

Postby tigger » Sun Sep 04, 2016 8:14 pm

Starting to liberate some of the formers.
Cheers Tigger
Attachments
big stik 1 002.jpg
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Re: Big Stik 80

Postby tigger » Sun Sep 04, 2016 8:22 pm

Some of the ply was a bit like charcoal and this is caused by an under powered laser so i'm told.
Some say don't worry about it, SIG kits tell you to just go ahead and glue but i sanded it back to the ply so the adhesive is glueing to the ply rather than the ash.
Cheers Tigger
Attachments
big stik 1 007.jpg
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Re: Big Stik 80

Postby tigger » Sun Sep 04, 2016 8:28 pm

More bits, this time balsa. The thick balsa [ 3/8"] is only lasered about 1/2 way through so as not to damage the wood and it's up to you to cut the rest by hand or saw. I just used a thin trow away blade which worked okay and squared the edges on the sandpaper and flat bench. Will post up some more during the week.
Cheers Tigger
Attachments
big Stik 3 002.jpg
tigger
 
Posts: 147
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Re: Big Stik 80

Postby tigger » Mon Sep 05, 2016 11:26 am

Made a start on the horizontal stabilizer and the plans called for some 3/8" ply or hardwood to be used for the mounting points but never had any so used some Oregon left over from kitchen window frame. Probably lighter than hardwood.
Cheers Tigger
Attachments
big Stik 3 009.jpg
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Re: Big Stik 80

Postby tigger » Mon Sep 05, 2016 11:29 am

Okay, on the case now and the Stab's all finished. Real tiger country with all the wood being 3/8"- 10mm thick for the stab so really solid stuff.
Cheers Tigger
Attachments
big stik 013.jpg
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Posts: 147
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Re: Big Stik 80

Postby tigger » Mon Sep 05, 2016 11:34 am

Managed to get the fin, rudder and fin fuselage mount sorted. Still some diagonals for the rudder to be glued in.
Cheers Tigger
Attachments
big stik 028.jpg
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Re: Big Stik 80

Postby tigger » Mon Sep 05, 2016 4:07 pm

At this stage i had glued the bottom fuse panels together, all cross grain and about 1 1/2 sheets of 5 mm balsa in total.
I had bought about a dozen sheets and weighed them all and they varied from around 33 grams/sheet to 60 grams so the heavy sheets i kept up the fwd end and lighter ones to the tail. The 1/4 spruce longerons had to be sliced together to get the length needed and i placed 1 mm ply on the sides of the joins an overkill but no real weight penalty. I glued these to the balsa sheet with gorrila resin glue [ yellow].
Cheers Tigger
Attachments
big stik 037.jpg
tigger
 
Posts: 147
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Re: Big Stik 80

Postby tigger » Mon Sep 05, 2016 4:12 pm

More longerons and bulkheads tacked in place to ensure correct spacing. As you can see i weighted them down with what was handy at the time,worked well.
Tigger
Attachments
big stik 040.jpg
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Re: Big Stik 80

Postby tigger » Tue Sep 06, 2016 11:45 am

Starting to get some spruce longerons in place and also some reinforcement for the U/C attachment which i have moved to just under the wing LE. The plan only showed a tri u/c so hope i have it right for a tail dragger configuration. Must mention about glueing ply, spruce etc that it pays to give all parts to be glued a light sand and dust off before adding the adhesive. This cleaning of the surface only lasts a few days so if parts are not glued that day resand them after 2-3days of sitting around. It will help to make a better joint.
Tigger
Attachments
big stik 074.jpg
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Re: Big Stik 80

Postby tigger » Wed Sep 07, 2016 12:35 pm

Now starting to get the aft fuse built with some 1/8" ply being added for extra strength for the fin and horizontal stab attachments. All of this is sheeted later with 4-5 mm balsa, so fuse is immensely strong.
Tigger
Attachments
big stik 077.jpg
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Posts: 147
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Re: Big Stik 80

Postby tigger » Wed Sep 07, 2016 12:37 pm

Just another shot of the aft inards.
Tigger
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big stik 078.jpg
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Re: Big Stik 80

Postby tigger » Thu Sep 08, 2016 10:44 am

A trial fit of stab and fin to rear fuse. The fin will be glued in place and the stab is held on by plastic bolts which i know nothing about so will do some forum trawling and see what comes up. The wing is also held on with plastic bolts so i suppose they are at least equal to rubber bands.
Tigger
Attachments
big stik 087.jpg
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Re: Big Stik 80

Postby tigger » Fri Sep 09, 2016 11:36 am

Now i'm getting the top longerons shaped to fit to the ply i previously glued in place. Once these are in place and the time comes for the fin to be fitted, the ends are just pulled together and glued to the rudder post. That's in the future as it's so much easier to work on the fuse with no fin.
Tigger
Attachments
big stik 095.jpg
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Re: Big Stik 80

Postby tigger » Fri Sep 09, 2016 11:44 am

Glue time and masking tape and stretchy cord hold it all in place whilst glue sets.
Tigger
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big stik 099.jpg
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Posts: 147
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Re: Big Stik 80

Postby tigger » Sat Sep 10, 2016 4:42 pm

Thought i would just show you all what glues, sanding blocks etc that i have been using on the build.
I chased around for a good or better epoxy than i had previously used but did a full circle and came back to Selleys Super Strength which has a long pot life when mixed and sets up over 6-8hrs, full cure in 72 hrs.I bought some Norstik epoxy but whilst it is a great glue i found it didn't flow well enough in the cold climes during winter and it became quite an effort to get it around each of the longerons. Gorilla resin [ yellow] has become the main spruce to balsa or balsa to balsa. I also use the Gorilla PU for joining ply bulk heads to each other where the need for thicker ones is called for. Found a real gem with a sanding block called plasterX and you can sand wet or dry and it washes out after use. It is away ahead of sandpaper and cheap enough as well. I got mine from Resine Paint shops but Mitre 10 sell them too. I also bought a fuel tank from Oz and i think it will be better than the old style clunk type, it has a fuel pick up that always follows the fuel in the tank. Hope some of this is of interest to you all.
Tigger
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big stik 111.jpg
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Posts: 147
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Re: Big Stik 80

Postby tigger » Tue Sep 13, 2016 5:50 pm

Just been glueing some of the longerons this week so nothing exciting happening so i'll post some things that should have been up earlier.
Tigger
Attachments
big stil 002.jpg
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Re: Big Stik 80

Postby tigger » Tue Sep 13, 2016 5:54 pm

This was one of the longerons i spliced using gorilla PU and some 1/16" ply on the sides.
Tigger
Attachments
big stik 055.jpg
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Posts: 147
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Re: Big Stik 80

Postby tigger » Tue Sep 13, 2016 6:00 pm

Needed to strip some 3/8"-10mm for the stab so i had to add a piece of 1/16'' Ply to the stripper to give me enough height for the thick balsa. It was hard wood so took a bit of pushing but it came out okay.
Tigger
Attachments
big stil 005.jpg
tigger
 
Posts: 147
Joined: Tue Dec 31, 2013 8:07 am

Re: Big Stik 80

Postby tigger » Sat Sep 17, 2016 6:00 pm

Sorry guys for the shortage of recent posts, been busy painting the kitchen,not good !!!. Have made a start on some half bulkheads for the fuel tank and rudder servo mounting. Thought maybe i'll try a pull-pull system. Haven't been there before so something new and i would need to mount the servo centre and behind the tank. I want to get the tank over the C of G with some height for the mounting but not interfering with the wing. Also have the ply sides getting ready to glue up.
Cheers Tigger
Attachments
big stik 114.jpg
tigger
 
Posts: 147
Joined: Tue Dec 31, 2013 8:07 am

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