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BERGFALKE IV CABRIO 1:4.7 SCALE

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chris williams
Posts: 1438
Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

BERGFALKE IV CABRIO 1:4.7 SCALE

Post by chris williams »

This has proved itself to be a very practically-sized model & a smooth performer. As far as I know, there are no IV's in this particular configuration, although there seems to be a variety of Bergfalke 3's thus modified. The unusual scale is due to the 1/4 scale version being scaled down to a size that suits existing stock material dimensions. The last minute decision to hide a motor in the fuselage has proved well-founded, as last weeks inaugural slope flights demonstrated in the light conditions...

Construction starts on the jig: note that the longerons are cut longitudinally at the front to ease the curvatures...
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chris williams
Posts: 1438
Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: BERGFALKE IV CABRIO 1:4.7 SCALE

Post by chris williams »

Once all the longerons are in place, the tail mount can be added, and then a template made up for the top sheeting...
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chris williams
Posts: 1438
Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: BERGFALKE IV CABRIO 1:4.7 SCALE

Post by chris williams »

Once the front planking & the top deck are in place, the fuselage can be removed from the jig. Note that there is a slight compound curve at the front of the top decking, hence all the masking tape. An alternative would be to separate the panel at F8...
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chris williams
Posts: 1438
Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: BERGFALKE IV CABRIO 1:4.7 SCALE

Post by chris williams »

To allow for the tapering thickness, the tailplane is built inverted on the board, than sheeted on top. Then it's inverted once again, with jigging supports spot-cyano'ed to the top sheeting, placed back on the board, and the bottom sheeting added...
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chris williams
Posts: 1438
Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: BERGFALKE IV CABRIO 1:4.7 SCALE

Post by chris williams »

The making of the 'cab'...
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chris williams
Posts: 1438
Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: BERGFALKE IV CABRIO 1:4.7 SCALE

Post by chris williams »

With some 5mm sq balsa added to increase the glueing area, the ply side panels are added, followed by the top panels...
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chris williams
Posts: 1438
Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: BERGFALKE IV CABRIO 1:4.7 SCALE

Post by chris williams »

Now, the ply sheeting can be finalised at the front...
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chris williams
Posts: 1438
Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: BERGFALKE IV CABRIO 1:4.7 SCALE

Post by chris williams »

Now the wheel mount can be finalised...
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chris williams
Posts: 1438
Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: BERGFALKE IV CABRIO 1:4.7 SCALE

Post by chris williams »

Now for the elevator: the first job is to hinge up the false LE to the tailplane and sand it flush. It can then be removed, and the elevator built over the plan. Then the final LE is added and rounded off...
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chris williams
Posts: 1438
Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: BERGFALKE IV CABRIO 1:4.7 SCALE

Post by chris williams »

Details of the elevator actuating pushrod arrangement...Now, construction of the fin/rudder starts.
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