M100S

Let us all watch your new project progress.
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RobbieB
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Re: M100S

Post by RobbieB » 19 Dec 2015, 08:33

The fuselage transition from the wing TE - a bit tricky was that:
IMG_0045_1 (2).jpg

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B Sharp
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Re: M100S

Post by B Sharp » 19 Dec 2015, 08:51

Pretty neat Robbie! I don't think I would have been able to get my head round that one, even after I had seen it done!
Brian. :?

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RobbieB
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Re: M100S

Post by RobbieB » 19 Dec 2015, 16:00

Thanks Brian, I was on the point of doing it in balsa (like I did with the 200) until I got hold of works drawings and it all became clear. Got to be spot on with the former shapes though or it doesn't work.

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RobbieB
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Re: M100S

Post by RobbieB » 19 Dec 2015, 16:39

IMG_0023 (2).jpg
Built up spars
IMG_0001 (2).jpg
Leading edge ribs
IMG_0008_2.jpg
Checking joiner tubes for alignment
IMG_0011_1.jpg
Trailing edge ribs

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RobbieB
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Re: M100S

Post by RobbieB » 19 Dec 2015, 22:12

IMG_0015_1.jpg
The trailing edge is a 0.4mm ply/6mm balsa/0.4mm ply sandwich - the balsa sanded to the rib taper when dry.
IMG_0014_1.jpg
The balsa inserts and the bottom ply laminate are clamped between two pieces of straight, 20x5mm pine strips when drying.

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RobbieB
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Re: M100S

Post by RobbieB » 02 Mar 2016, 16:28

A little progress, but progress nonetheless.


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chris williams
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Re: M100S

Post by chris williams » 02 Mar 2016, 16:51

Blimey Robbie, even the Wookie is faster than you these days! Would you consider those brakes any less hassle to close than the scissor variety?

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RobbieB
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Re: M100S

Post by RobbieB » 02 Mar 2016, 22:21

Chris,

Yes, I'm afraid some stuff has got in the way of late but I am building a little momentum now (and before someone chips in, that's not a little known pre war sailplane).

The six sets of blades open and close very easily without the geometry problems of Schemp type brakes so there is little load on the servo. The front and rear sets are driven by their own pushrod connected via a transverse link so only a single rod to the servo is required.

The tricky bit is setting them up which is achieved by using a clevis for each blade so they can be adjusted independently. The problem is, it can't be done accurately until the brake box is secured in the wing as the blades are flopping around like a you know what on a trampoline until that is done, so it then makes final adjustment difficult in the confined space available. I don't think I'll be doing another one of these!

The picture below explains it better.
m100_brakes.jpg

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Cliff Evans
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Re: M100S

Post by Cliff Evans » 02 Mar 2016, 23:02

:mrgreen: Bloooooooooooooooooooody hell!

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B Sharp
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Re: M100S

Post by B Sharp » 03 Mar 2016, 10:59

Better you than me Robbie, but it will look cool on approach.
Brian. :)

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