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SG38 1/4 Scale (Krick)

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Cliff Evans
Posts: 202
Joined: 29 Dec 2019, 15:13
Location: Bristol
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Re: SG38 1/4 Scale (Krick)

Post by Cliff Evans »

Mine is 1/3 scale and has a lot more room so it wasn't really an issue!

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mjcp
Posts: 89
Joined: 29 Jul 2015, 08:14
Location: A wind swept hill with no wind, in driving distance of Windsor, UK
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Re: SG38 1/4 Scale (Krick)

Post by mjcp »

You're already (effectively) using pulleys in 1:1 mode in the cable run, could you fit a 1:3 pulley arrangement in that box section?


Servo pulls the smaller, existing cable is attached to the larger attached on top?

Let me know if you need a pic as my description might not render as a visualization in your mind! ;-)

M
m̶j̶c̶p̶ Marc

Hanger -
Graupner (old) K-8b, Mini Solius chuck glider conversion, UMX ASK-21, HF/Czech 2m ASW27, DG808s 4m, X-models Mini-blade, Lidl glider pitcheron.

Ted
Posts: 36
Joined: 28 Oct 2019, 15:08
Location: South Wales

Re: SG38 1/4 Scale (Krick)

Post by Ted »

Thanks both for the advise.

I have have compared the plan to what I have actually build and noticed an offset with the rudder horn centre point, the plan denotes that the horn cable attachment point is aligned with the centre pivot point. and mine are only slightly forward of this which may be why I only have minimum deflection.

Did some research and ended up reading all about geometry and closed loop isues, crossing lines etc. https://www.modelflying.co.uk/forums/po ... =98938&p=2

Don't think there's enough room in the fuse to install pulley ratio, possibly look at increasing the servo arm and trip the fuse side to accommodate, may also cross the cables to ensure there is no binding on the servo bearing.
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Ted
Posts: 36
Joined: 28 Oct 2019, 15:08
Location: South Wales

Re: SG38 1/4 Scale (Krick)

Post by Ted »

OK so its been a while however I have made progress having built one of the ailerons although the fist wing is build upside down the aileron that is on the same side of the plan is for the right wing, oh well I'm sure it'll fit when I finally get to build the other wing.

So not impressed about having to soak the plan in fuel oil or similar to get the other wing build, sure;y for the cost of this kit there would be a full set of plans and laid out correctly i.e. to make a full wing plan you have to join 2 sheets together :shock: I'm beginning to think I should have gone for the 1/3 scale version (short kit) with all the parts lazer cut, yes I would had to buy additional balsa etc but at least the ribs would be uniform and already cut out, some of the parts especially the seat plywood have been a pain to cut out :evil: , well that's my rant over with, I'm working on the right wing now with the main spars and ribs all assembled, oh dear, appear to have run out of webbing balsa :roll: will have to order some with the covering and while I'm waiting for delivery I can build the other aileron and fit all the gussets, how I loath cutting gussets :cry:

Oh well if all goes well I should be applying the covering in a few weeks and then sort out the rudder movement, I think I'll add another servo to the fuse bay and mount both rudder servos sideways with an extended horn to provide more movement and either mix on the radio or use Y lead, yes slightly more weight gain but happy to do so as this is not a floater and will be for slope souring.

Note the servo extension cable installed for the aileron and is bonded in with either silicon or in this case "stick like" I have used this technique many times before and have never had any issues, these are 2 older servos so I cut off the fixing lugs so the back of the servo sits tight against the webbing, "Tip" test servos before installing test servos on the work bench lay them next to each other facing the direction that they will be when installed into the wings checking that the arms are centre and movements are opposite to each other ans label them accordingly, this will avoid any issues later when you connect everything up :)
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SG38 - My build April 2020 (183).JPG
SG38 - My build April 2020 (200).JPG
SG38 - My build April 2020 (199).jpg
SG38 - My build April 2020 (179).jpg

Ted
Posts: 36
Joined: 28 Oct 2019, 15:08
Location: South Wales

Re: SG38 1/4 Scale (Krick)

Post by Ted »

OK so finally finished both wings and have stained and Balsa loc'd set temp installed Aileron hinges to ensure alignment.

just started to cover first wing with Oratex, yep I'd swear its Solartex currently awaiting delivery of 2 more rolls so I can get on and finish.
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SG38 - My build May 2020 (248).jpg
SG38 - My build May 2020 (286).jpg
SG38 - My build May 2020 (273).jpg
SG38 - My build May 2020 (260).jpg
SG38 - My build May 2020 (258).jpg
SG38 - My build May 2020 (257).jpg
SG38 - My build May 2020 (249).jpg

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