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Tim's Skywriter Build

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Tim Ballinger20/02/2017 13:42:25
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540 forum posts
227 photos

Little irritating. Added the underside sheeting as per the plan in 2mm sheet forgetting the tail plate was 3mm ply. Now I have a 1mm ridge. I say the original build had used 3mm sheet, perhaps that where the glitch came from. Ah well not too serious .

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Tim Ballinger20/02/2017 18:08:42
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540 forum posts
227 photos

I made the u/c plate a bit thicker by using a 6mm ply plate inset between 3&3a. Then a 3mm ply plate on top. The 6 mm inset sits just clear of the wing dowel.

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Tim Ballinger20/02/2017 18:11:33
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540 forum posts
227 photos

Not sure if anyone else has noticed but the 6mm cowl underside is drawn 20mm to narrow at the 'wide' end. That is 10mm each side. Hence the cnc part is also too narrow.

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Tim Ballinger20/02/2017 18:13:27
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540 forum posts
227 photos

So being frugal I returned it to its cut out, applied cyno to the join and re-made the part.

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Tim Ballinger21/02/2017 12:17:27
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540 forum posts
227 photos

Now for the ammonia trick. Certainly clears your sinuses!

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Tim Ballinger22/02/2017 21:07:36
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540 forum posts
227 photos

Cut and bent the u/c to shape today while waiting for glue to dry.

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john stones 122/02/2017 23:26:24
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10499 forum posts
1480 photos

That looks very nice work Tim, i've a few dural u/c's so no bending for me.

John

Tim Ballinger23/02/2017 08:02:04
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540 forum posts
227 photos

I only have two existing u/c , one too big and one that is so old, battered and bodged I'd be ashamed to put it on a new model!

Tim

Tim Ballinger25/02/2017 18:10:41
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540 forum posts
227 photos

Finished all the top sheeting and front cowl followed by a lot of sanding. Must clear up the mess soon. That nose looks really long when you think we're the pilot would sit.

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Tim Ballinger25/02/2017 18:14:15
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540 forum posts
227 photos

The hatch feels really solid having used 4 sets of magnets. Not decided whether to use a mini latch as well or not yet. Perhaps I'll get used to relying on magnetism if I wait a bit.

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Tim Ballinger25/02/2017 18:18:44
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540 forum posts
227 photos

img_0912.jpgSo although I do not yet have the right size prop I wanted to check motor position and prop clearence with the cowl. It's clear but only just so a bit more sanding required on the front.

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john stones 125/02/2017 19:40:28
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10499 forum posts
1480 photos

Better a little longer nose than a big lumpa lead, looks like shaping the nose was enjoyable party

John

Lucas Hofman26/02/2017 09:21:50
596 forum posts
316 photos

This start to look like a very complete fuselage Tim.

I have good experiences with hatches only hold by magnets, if - and only if - they magnets are kept well aligned. It looks like your hatch can slide to the side. Would if be an idea to use 2 little balsa lists to lock the hatch in place sidewise?

Lucas

Edited By Lucas Hofman on 26/02/2017 09:22:30

Tim Ballinger26/02/2017 09:37:06
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540 forum posts
227 photos

Thanks Lucas, It is currently restrained sideways only by the cutouts in the hatch end formers that fit over the longerons . I have been debating putting some 'tabs' on the inner side face which is what I think you are suggesting. Certainly going to need some form of pseudo handle like Lyndsy had or it will be nearly impossible to get off. Alternative is use two little latches to keep it straight but that seems to go against the concealed feature of the magnets....but would give something to grab when pulling it off.

Tim

Lucas Hofman26/02/2017 10:17:27
596 forum posts
316 photos

The hatch end should be more then enough, if needed reinforced by a 6x3 mm list glued on the bottom. That will not make the hatch opening narrower - our hands are always too big.

Forces on the hatch when flying are negligible, so if the magnets are so strong that you do not manage to open the hatch you may cut of the former ends so you can push it sideways until the magnets loose their grip. That is how I take off the Ballerina hatch (which has a dowel in front and magnets back.

Lucas

Tim Ballinger27/02/2017 17:38:19
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540 forum posts
227 photos

Just a battery tray today. Time to move on to the tailplane...

Tim Ballinger27/02/2017 17:40:26
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540 forum posts
227 photos

Forgot the pics...

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Lucas Hofman28/02/2017 07:16:09
596 forum posts
316 photos

Ample space for an ESC beside the battery. What concerns me a little is that there is little opportunity to use the battery for getting the CG right. In the Ballerina and the Tucano I had 20-25cm to move the battery back and forth.

Lucas

Tim Ballinger28/02/2017 07:53:36
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540 forum posts
227 photos

Lucas,

Funnily enough I was thinking about that when I made the tray so I dropped it down from f3 to the floor and there is room to slide the battery forward into the front cowl (i.e. Under the engine) . I have a piece of 6m square balsa in place which stops that atm but easy to remove I need to move the battery forward.

I started the tailplane last night and my good intentions to laminate the le like you evaporated when I saw all the pre cut 6mm in the wood pack. Just too tempting.

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Tim

Tim Ballinger28/02/2017 08:38:31
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540 forum posts
227 photos

Meant F2 of course in comment above.

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