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SG38 1/4 Scale (Krick)

Let us all watch your new project progress.
Paul_Williams
Posts: 135
Joined: 18 Mar 2015, 17:53

Re: SG38 1/4 Scale (Krick)

Post by Paul_Williams »

Hi Ted, looking good - I have one of these bought years ago but I didn't realise that you can build one in a week ! You really work quickly !!!!!!!
Can I ask what you used to stain the wood and if you had any problems with that ?
Also, have you found any problems with the parts (except the seat) and the build instructions ?

Looking forward to a flight test report too.

Paul

Ted
Posts: 35
Joined: 28 Oct 2019, 15:08
Location: South Wales

Re: SG38 1/4 Scale (Krick)

Post by Ted »

Paul_Williams wrote:
01 Nov 2019, 21:38
Hi Ted, looking good - I have one of these bought years ago but I didn't realise that you can build one in a week ! You really work quickly !!!!!!!
Can I ask what you used to stain the wood and if you had any problems with that ?
Also, have you found any problems with the parts (except the seat) and the build instructions ?

Looking forward to a fligh6 ttest report too.

Paul
OK so the stain used is a repair stain purchased from my local Wilko store for £2.75 available in 2 shades Dark and Light oak, it I'm using the lighter shade for all areas although I may use the dark for the main wing panel sections for contrast.
The stain does have wax in so you will need to balsalock the areas that will be covered otherwise the covering will not adhere.
SG38 - My Build October 2019 (51).JPG


Instructions: The translated instruction I have posted are OK but make sure to read them thoroughly as the comprehension is difficult and constantly referencing the parts list both on the translation list and the German instruction list on the last 2 pages.

Quick Build: Well I did the initial build over 2 weeks of evenings before I started this post and after inadvertently using the wrong piece of balsa for gussets I have had to stop the build until I can purchase some more balsa, hopefully later today, the aim is to complete the tail section by the end of next week although the wife has a list of DIY to do around the house :cry:, Ideally I will complete the tail section and covering before I make a start on both main wings.

The seat: you'll find the plywood seat is only marked on the plywood not actually punched through so a lot of cut to near size with fret saw and sand in the rest, the hole were drilled out and again final sanding to shape, just take your time, its worth it to get the finish.

Hope this helps
Last edited by Ted on 26 Apr 2020, 20:55, edited 4 times in total.

Ted
Posts: 35
Joined: 28 Oct 2019, 15:08
Location: South Wales

Re: SG38 1/4 Scale (Krick)

Post by Ted »

OK so after a long and tedious winter I’ve found the time to revisit my SG38 build not COVID related just made the effort to hopefully see it to its finish.
So lifted the tail section off the building board and got out the belt sander, be careful if you have one of these they can be a bit fierce and before you know it you’ll have ruined what you spent hours on.
Having profiled the stabiliser tips, test installed to the tail boom, looks good, need to finish those gussets on the top side, shouldn’t be an issue, profiled and shaped the elevators ready for stain, hinges, control horns and covering, Note they are still joined as this is how I build them on the board, will separated them after installing hinges and dry fit and checking against the stabiliser for good fit.
Attachments
Tailplane
Tailplane
Elevators
Elevators

Ted
Posts: 35
Joined: 28 Oct 2019, 15:08
Location: South Wales

Re: SG38 1/4 Scale (Krick)

Post by Ted »

OK so covered the elevators and test fit hinges before permanently epoxying hinges in place to the elevators only this makes certain that the hinges will fit to the tail-plane section later, also installed the control horns using 5 minute epoxy resin.
Next job to finish the tail stabiliser, more gusset cutting :(
Attachments
SG38 - My build April 2020 (17).JPG
SG38 - My build April 2020 (18).JPG
SG38 - My build April 2020 (16).JPG
SG38 - My build April 2020 (17).JPG
SG38 - My build April 2020 (20).JPG
SG38 - My build April 2020 (21).JPG
SG38 - My build April 2020 (22).JPG
SG38 - My build April 2020 (23).JPG

Ted
Posts: 35
Joined: 28 Oct 2019, 15:08
Location: South Wales

Re: SG38 1/4 Scale (Krick)

Post by Ted »

OK so finally finished cutting gussets, stained, left to dry overnight, balsaloc and covered, installed elevators and fitted to tail boom, happy with the results.

What's next, oh yeh need a couple of main wings :roll:
Attachments
SG38 - My build April 2020 (23).JPG
SG38 - My build April 2020 (24).JPG
SG38 - My build April 2020 (25).JPG
SG38 - My build April 2020 (36).JPG
SG38 - My build April 2020 (41).JPG

Ted
Posts: 35
Joined: 28 Oct 2019, 15:08
Location: South Wales

Re: SG38 1/4 Scale (Krick)

Post by Ted »

OK so started the main wings, well the left one.

Followed instructions, takes ages to figure out what goes where, luckily I spent some time before starting the build to check off all the parts against the contents of the box, you must do this otherwise you will get confused/lost :?
Look at the plywood and balsa layouts at the back of the plans, get yourself a pencil and a magnifying glass and check off all the pressed parts, write the numbers on the parts , there should be 2 of everything.

Then lay out all the bundles of balsa do not disband them as they are bundled logically i.e. ailerons , main spruce spares etc.
I made an error and used one of the block lengths of balsa which was meant for the rudder leading edge so had to remake it from stock :cry:

TIP: the main ribs are laid out on the plan upside down and have to be soaked in something, yes something what is recommend is glow fuel to allow the drawing to be transparent to the other side of the paper and them flipped over to build the ride(Starboard wing, well actually its the port wing when looking form the rear, although I think I'll use something else other than glow fuel, you would have thought that considering the amount of money the kit costs :? I think it was in excess of £250 and that was several years ago that you'd get both wing plans :x .

Where was I, Oh yeh so the main spar webbing is a sheet of 3mm x
35mm x 79mm and this is the set distance between all ribs!!! so when setting out the ribs simply use a scrap piece of balsa 79mm for referencing the distance between each rib so when you get to installing the main spar webbing the distance is set accurately so no need to trim, yes I did have to slightly sand some of the web edges to ease the fit but nothing drastic, I will use this technique when I build the other (Right / Starboard) wing.

Well that my rant over with, I have made slow but good progress with the first wing which is what I'd expect although having prepared both main wing spars and identifying cutting out all the parts for the starboard wing it should build itself :)

Production fault: All wing ribs 145 which is the shorter main wing outer section forwards of the ailerons all have double spar cut out sections which is incorrect as the main spar is only 1 x single spruce section as apposed the the main root spars which does have a double laminated spruce spare, I have highlighted this in the photos and have had to add a scrap of balsa to compensate the the deeper sit in the balsa rib. (Hope that makes sense). :roll:
Attachments
SG38 - My build April 2020 (62).JPG
SG38 - My build April 2020 (67).JPG
SG38 - My build April 2020 (68).JPG
SG38 - My build April 2020 (69).JPG
SG38 - My build April 2020 (70).JPG
SG38 - My build April 2020 (71).JPG
SG38 - My build April 2020 (73).JPG
SG38 - My build April 2020 (74).JPG
SG38 - My build April 2020 (76).JPG
SG38 - My build April 2020 (79).JPG

Ted
Posts: 35
Joined: 28 Oct 2019, 15:08
Location: South Wales

Re: SG38 1/4 Scale (Krick)

Post by Ted »

OK so the first wing is progressing slowly, decided to use 3mm gussets on the wing tips as apposed to 1.5mm as per instructions makes it easier to work with and looks better IMO weight gain is negligible as its not a high performance model.

Installed rudder closed loop.
Attachments
SG38 - My build April 2020 (127).JPG
SG38 - My build April 2020 (132).JPG

Ted
Posts: 35
Joined: 28 Oct 2019, 15:08
Location: South Wales

Re: SG38 1/4 Scale (Krick)

Post by Ted »

OK so made up the wing spar templates, they were not pre cut so had to cut them out by hand :(
Installed all rear control lines, had to add a lower torsion line tot he sailplane as it was not quite level but I did expect some slight warping over time as I had anticipated so this was going to be installed at some point just to keep things tort as the tail-plane does flex quite a lot.

Test fitted the wing, couldn't resist this now the wing was off the building board, looks good, NOT glued the main spar box section yet until the other wing has been built and test fitted and aligned correctly.

NOTED: Not a lot of rudder movement even with the max servo arms installed, may have to address this after first maiden flight if not responsive enough, elevator looks ok but then again I'm not going to be throwing this model about in the sky.

Covering main wings, realised that Solartex no longer available so maybe substitute with Oracover , told its the same stuff, would appreciate if someone out there could confirm this as I can't get a sample anywhere, looking for natural, unless someone has 4 metres of solotex for sale :)
Attachments
SG38 - My build April 2020 (134).JPG
SG38 - My build April 2020 (135).JPG
SG38 - My build April 2020 (142).JPG
SG38 - My build April 2020 (143).JPG
SG38 - My build April 2020 (144).JPG
SG38 - My build April 2020 (145).JPG

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Cliff Evans
Posts: 175
Joined: 29 Dec 2019, 15:13
Location: Bristol
Contact:

Re: SG38 1/4 Scale (Krick)

Post by Cliff Evans »

You will need to get that rudder movement sorted before flying. If mine is anything to go by, It will need a fair bit!

Ted
Posts: 35
Joined: 28 Oct 2019, 15:08
Location: South Wales

Re: SG38 1/4 Scale (Krick)

Post by Ted »

Hi Cliff

Thank you for your reply and advise.

Yes I thought as much ideally the rudder horn would be located nearer to the vertical hinged pivot point which would provide more deflection.

May I ask how yo resolved your issue, i don't want to cut the fuselage about if there's another solution.

Cheers
Attachments
SG38 - My build April 2020 (1333).jpg

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