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Scratch built Pilatus B4 to 1/4 scale.
- VinceC
- Site Admin
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Re: Scratch built Pilatus B4 to 1/4 scale.
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
Re: Scratch built Pilatus B4 to 1/4 scale.
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.
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.
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Re: Scratch built Pilatus B4 to 1/4 scale.
Utter carnage. You should be ashamed.
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Re: Scratch built Pilatus B4 to 1/4 scale.
If I post a picture of mine, I think you'd probably suffer some sort of seizure Brian...
- RobbieB
- Posts: 547
- Joined: 07 Mar 2015, 22:22
- Location: North West
Re: Scratch built Pilatus B4 to 1/4 scale.
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).
Re: Scratch built Pilatus B4 to 1/4 scale.
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.
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.
- RobbieB
- Posts: 547
- Joined: 07 Mar 2015, 22:22
- Location: North West
Re: Scratch built Pilatus B4 to 1/4 scale.
I knew I shouldn't have asked........................
Re: Scratch built Pilatus B4 to 1/4 scale.
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.
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.
Re: Scratch built Pilatus B4 to 1/4 scale.
The canopy glazing tool is now ready to be sent off to Sarik to have a couple of canopies pulled. The mottled appearance is due to me making minor adjustments to the shape by judicious skims of filler followed by careful use of various grades of wet and dry paper. I spent a lot of time going over it filling tiny pin holes. Final sanding with 400/800/1200 wet and dry paper has given a nice smooth finish. I suspect that there will probably be a few minor imperfections in the final pulled canopy but as they say “at 500 ft who will ever notice”.
I have also received a very nice 3D printed instrument panel from Cliff Evans (thanks Cliff) which will adorn the finished cockpit.
Brian.
I have also received a very nice 3D printed instrument panel from Cliff Evans (thanks Cliff) which will adorn the finished cockpit.
Brian.
Re: Scratch built Pilatus B4 to 1/4 scale.
I have now started the build of the right hand wing. The completed left hand wing was built inverted on the plan of the right hand wing therefore logically the right hand wing is built inverted over the plan for the left hand wing. Straightforward right? No Left? Confusing isn’t it?
Brian.
Brian.