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Scratch built Pilatus B4 to 1/4 scale.

Let us all watch your new project progress.
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chris williams
Posts: 1192
Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: Scratch built Pilatus B4 to 1/4 scale.

Post by chris williams »

settle overnight That's where you're going wrong 8-)

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B Sharp
Posts: 723
Joined: 19 Mar 2015, 17:18
Location: Perthshire

Re: Scratch built Pilatus B4 to 1/4 scale.

Post by B Sharp »

So much for building at “Williams “ light speed!
The amount of progress I have made has been frustratingly slow, mainly due to a lack of foresight on my part. However all spars are glued in place and all the webbing on the main spar as well so the wing feels quite stiff. The 3/32 balsa sheeting was applied to the underside back to the rear spar and then to the upper surface forward of the main spar and also the leading edge sheeting.
At that point I hit a problem. I had to install the electric airbrakes before I fitted the rest of the top sheeting. Did I buy the airbrakes? Can’t remember! Turn the workshop up and down and the only thing I found was my original materials list which didn't have the airbrakes crossed off. Oh Bother - Never mind – Phone Gliders and buy a set. Blast they are all on back order! However a tinterweb search got me a set from RC World.co which arrived this afternoon. Thanks guys – great service. I can now get on with the rest of the wing sheeting.
Brian.
Attachments
Spars and webbing added - sheeting started.
Spars and webbing added - sheeting started.
Partially sheeted wing with the airbrake fitted.
Partially sheeted wing with the airbrake fitted.
Nice electric brakes which fit neatly into the wing
Nice electric brakes which fit neatly into the wing
And which also go up and down reliably.
And which also go up and down reliably.

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VinceC
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Re: Scratch built Pilatus B4 to 1/4 scale.

Post by VinceC »

Nice work as usual Brian. Just to give you some encouragement, here is a full size in distress. The Main spar failed during aeros after the pilot overstressed the aircraft. He bailed out safely
Attachments
F-CINH_1.jpg
F-CINH_2.jpg
F-CINH_3.jpg

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B Sharp
Posts: 723
Joined: 19 Mar 2015, 17:18
Location: Perthshire

Re: Scratch built Pilatus B4 to 1/4 scale.

Post by B Sharp »

Thanks for that Vince, just the encouragement that I needed while building wings!

I have now added the trailing edge of the wing. The lower surface has a 1/16 ply strip ½ inch wide attached to the balsa sheeting to provide a tougher edge. It also allows me to sand the trailing edge down to a fine edge (photo one)
The upper surface is 3/32 balsa with the rear underside sanded to a fine taper. This allows me to replicate the fine undercamber of the HQ3.5/14 wing section (photo two). The upper and lower trailing edges are clamped together between two steel straight edges which should give me a good straight structure when the aliphatic glue sets.
I have added a photo of my workshop as just I have left it which should dispel some of my super tidy image. This is how things usually look while I'm working and before the daily tidy up.
Brian.
Attachments
Lower trailing edge in place.
Lower trailing edge in place.
Top sheeting added and clamped up.
Top sheeting added and clamped up.
What my workbench usually looks like.
What my workbench usually looks like.

Jolly Roger
Posts: 413
Joined: 30 May 2015, 20:35
Location: Sutton Bank, North Yorkshire

Re: Scratch built Pilatus B4 to 1/4 scale.

Post by Jolly Roger »

Utter carnage. :o You should be ashamed.

Elliot Howells
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Joined: 18 Mar 2015, 08:18
Location: West Wales
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Re: Scratch built Pilatus B4 to 1/4 scale.

Post by Elliot Howells »

If I post a picture of mine, I think you'd probably suffer some sort of seizure Brian...

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RobbieB
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Joined: 07 Mar 2015, 22:22
Location: North West
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Re: Scratch built Pilatus B4 to 1/4 scale.

Post by RobbieB »

Jolly Roger wrote:
30 Apr 2020, 15:53
Utter carnage. :o You should be ashamed.
Agreed, but at least the pins in the wing are colour co-ordinated (and no doubt Brian will be on any time soon with a logical explanation for that).

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B Sharp
Posts: 723
Joined: 19 Mar 2015, 17:18
Location: Perthshire

Re: Scratch built Pilatus B4 to 1/4 scale.

Post by B Sharp »

No Problem Robbie!
The pink/purple pins are old and a little blunt and bent. There are not enough green pins to place one in each rib, therefor the blue pins have been used to fix the sheet to the spar. However there are not enough blue pins left to complete the job therefor the new yellow pins were used to hold down the centre of the sheeting to the ribs. Schimples!
Brian. :D :D :D :D :D

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RobbieB
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Joined: 07 Mar 2015, 22:22
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Re: Scratch built Pilatus B4 to 1/4 scale.

Post by RobbieB »

I knew I shouldn't have asked........................

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B Sharp
Posts: 723
Joined: 19 Mar 2015, 17:18
Location: Perthshire

Re: Scratch built Pilatus B4 to 1/4 scale.

Post by B Sharp »

The left hand wing is now complete but I am just waiting on a wood delivery before I start on the right hand wing. (must Remember – Right Hand, Right Hand......)
This morning I have installed the mounts for the rudder and aerotow release servos. I cut and joined two chunks of orange/pink foam for the canopy moulding. That was then temporarily fitted to the fuselage and then attacked with a large rasp. Using a selection of less and less abrasive sand papers I have now reduced the foam to something approximating the finished canopy shape.
Also bearing in mind that I have also planted my peas and sown cabbage, Brussels sprouts and kale for next winter, that’s not a bad mornings work.
Brian. :) :) :)
Attachments
Rudder and aerotow servos in place.
Rudder and aerotow servos in place.
Fuselage plus a large chunk of foam.
Fuselage plus a large chunk of foam.
Almost a canopy moulding.
Almost a canopy moulding.

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