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Gentle Curves - Lucas his Skywriter

Build blog - MB2017 - Skywriter

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Lucas Hofman28/01/2017 14:33:14
668 forum posts
375 photos

Chris, thanks for the heads up. I did use the original plan the cut the F3A/F4A. Even twice - I want to be able to easely check the bolts holding the upper struts and remove the struts when needed so I am planning an extra hatch from F3 to F4A. Checking now I see that also F2H/F3H are too narrow on the plan. 4 helping formers are do not take much time to make again, but so good to find out now. Thanks again Chris.

Lucas

ps. 6 flights with the Ballerina today from the frozen lake. I cannot complain about the amount of hobby time available!

Lucas Hofman28/01/2017 14:36:50
668 forum posts
375 photos

Glueing the F3/F4 assembly in place:

img_3617 (small).jpg

Better view on the glueing area by doing this in two steps.

img_3618 (small).jpg

Not the square against the tailplane seat - this ensures that the fuselage halves are aligned, and that the tailplane seat will be horizontal when the fuselage halve are brought together later.

Chris Barlow28/01/2017 15:15:00
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1904 forum posts
1308 photos
Posted by Lucas Hofman on 28/01/2017 14:33:14:

ps. 6 flights with the Ballerina today from the frozen lake. I cannot complain about the amount of hobby time available!

Where in Norway are you Lucas? We're visiting Bergen at the end of Feb and the kids are hoping for snow! lol

Lucas Hofman29/01/2017 13:03:20
668 forum posts
375 photos

I am living just west of Oslo Chris. Very little snow here (although it is snowing now). But all the lakes and even the some bays of the Oslofjord are frozen, so live is good for those flying models!

In Bergen is is usually raining, and you need to get a little inland (and up in the mountains) before this falls as snow.

Lucas Hofman30/01/2017 21:37:54
668 forum posts
375 photos

Glued the last two formers and the tailpost in place tonight. I had to sand them a 1-2mm smaller to get a nice even curve in the fuselage sides:

img_3625 (small).jpg

This is fun! Quite a few hours of preparation now form a fuselage in short time. Tomorrow the tailplane seat, the tailwheel plate and the stringers and the the aft part of the fuse looks the part.

Happy building, Lucas

john stones 130/01/2017 21:53:06
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11597 forum posts
1517 photos

Looks the part to me Lucas yes

John

Chris Barlow30/01/2017 23:09:31
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1904 forum posts
1308 photos

Soon be time for some bench flying Lucas! laugh

The Slec jig really does make fuselage assembly so easy and accurate.

Lucas Hofman31/01/2017 09:28:56
668 forum posts
375 photos
Posted by Chris Barlow on 30/01/2017 23:09:31:

Soon be time for some bench flying Lucas! laugh

The Slec jig really does make fuselage assembly so easy and accurate.

Indeed it does. And I am also fond of those little clamps (think I bought them from SLEC too).

Lucas

Lucas Hofman31/01/2017 22:19:37
668 forum posts
375 photos

two steps forward, one step back! Or in this case 0 steps forward, 1 step back:

img_3627 (small).jpg

When fitting the top stringer I noticed that there was a very big change in height from F8 to F9. Looking closer I saw F9 hanging 3 mm under the fuselage sides

F9 (on the drawing is missing it "lowest" 2 teeth. And since I have no longeron to define the vertical position I had pushed the former to far down. Cutting loose might damage the sides and the tailplane seat so I have opted to make a "F9A", and now with the lower teeth, and glue that on the front face of F9. Not a big deal, but irritating. Tommorrow better.

Lucas

Chris Barlow01/02/2017 00:36:22
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1904 forum posts
1308 photos

That's a pain. I usually get paranoid when things are going well or very easy and start looking for what I've missed or not noticed!

The little Slec elastic band clamps are great too! Do you use the locking tab or just let the elastic band hold the clamp?

Lucas Hofman01/02/2017 06:59:46
668 forum posts
375 photos

I do not use the locking tab. The elastic bands detoriate in a year of so but SLEC was kind enough to send 20 spares with another shipment. I have some with 1 and others with 2 bands, to have varying pressure.

Lucas Hofman01/02/2017 22:23:20
668 forum posts
375 photos

This is fun:

img_3629 (small).jpg

I put all stringers dry in place, pull the elastic bands over and check that all stringers are pressed down in the notches. When all is OK a drop superphatic in each notch and all is down. could be done with CA too but I do not like the smell and the brittleness of the joints.

john stones 101/02/2017 22:45:40
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11597 forum posts
1517 photos

You enjoyed that bit did you face 1

I like to see a man happy in his work, looks accurately done as well yes

John

Lucas Hofman02/02/2017 21:49:05
668 forum posts
375 photos

And this even more! img_3643 (small).jpg

A work of art! Beats television every time!

Lucas

Lucas Hofman02/02/2017 21:54:07
668 forum posts
375 photos

Last months free plans included a template to flue the firewal at the correct angle (am I the only one studying every plan even if I have no intention at all to build it....). That was a nifty idea.

I have drawn one for the Skywriter (2 degree down, 2 degree right). Cutted it from a bit of depron:

img_3642 (small).jpg

if you want to do the same you can find a PDF on my dropbox (https://www.dropbox.com/s/4nl7bf93946e4a7/template%20firewall%20placement.pdf?dl=0)

Lucas

Lucas Hofman03/02/2017 07:05:29
668 forum posts
375 photos

Using a template makes it more easy to get the thrust line correct:

img_3644 (small).jpg

The lines on the jig make aligning the template a doddle. Recommended.

Lucas

Lucas Hofman03/02/2017 22:02:17
668 forum posts
375 photos

Oops! What I forgot when glueing the firewall was to check whether the top of the fuselage sides was level. Luckily it was only a few tenth of a degree of. F1 came in late tonight. I wondered whether I should follow the angle of the firewall or just glue i perpendicular to the datum line. I choose the later, can always sand the cowling front to it is aligned with the propeller.

img_3645 (small).jpg

Lucas Hofman04/02/2017 14:35:00
668 forum posts
375 photos

An exersize for you gentlemen: where is the mistake? :

img_3647 (small).jpg

Hint: it is a silly one, but easy to fix if you are thrifty.

(Answer will come tomorrow)

McG 696904/02/2017 14:50:45
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3305 forum posts
1257 photos

Hi Lucas,

I'll give it a try then...

... hemm... if the former behind your laminated firewall is the front former of your top hatch... well, then your hatch is going to have some 'right-thrust' as well... surprise

But maybe I'll get another silly idea later on...

Cheers

Chris

john stones 104/02/2017 15:26:28
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11597 forum posts
1517 photos

Your outer fuzz doubler top should be level with inner sheet.

John

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