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TYPE 13 PETREL 1/4 SCALE

Let us all watch your new project progress.
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Peter Balcombe
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Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: TYPE 13 PETREL 1/4 SCALE

Post by Peter Balcombe »

Swindon Aircraft Company is a couple of £ cheaper than SLEC if you get the full sheet. ;)
Peter

john greenfield
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Re: TYPE 13 PETREL 1/4 SCALE

Post by john greenfield »

Peter Balcombe wrote:
16 Feb 2020, 12:29
Swindon Aircraft Company is a couple of £ cheaper than SLEC if you get the full sheet. ;)
Peter
Not when you add on the postage !!

AEB
AEB = Aeronautical Energiser Bunny (with thanks to CW)

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

Re: TYPE 13 PETREL 1/4 SCALE

Post by chris williams »

Rudder cable guides are from Bowden outers: the stuff from Gliders in nice and straight, and perfect for the job...
Due the sharpish curve at the rear, the lower ply sheeting is glued in the middle first, then, when the PVA has dried, the lower edges simultaneously glued in place with tensioned masking tape...
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chris williams
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Location: Blandford Dorset

Re: TYPE 13 PETREL 1/4 SCALE

Post by chris williams »

A quick look at the root and tip wing ribs shows just how tapered the Petrel wings are...! In its earliest stage, the wing is assembled flat on the board before being hoisted up on to the supports in order to add the top spar. The gentle angle of the gull break means that the 5mm sq spars aren't overly distressed at being forced into the correct angle.
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SedB
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Joined: 14 Nov 2019, 09:17
Location: Netherlands

Re: TYPE 13 PETREL 1/4 SCALE

Post by SedB »

Nice progress Chris!
The ribs (before assembly) look very fragile to me, guess I'd manage to break while testfitting! :lol:

Daniel

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chris williams
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Location: Blandford Dorset

Re: TYPE 13 PETREL 1/4 SCALE

Post by chris williams »

Med/hard 2.4mm balsa, Dan...strong enough!

With the basic wing structure taped to the gull supports, the top spar can be added, as well as the 0.8mm ply reinforcements to the rear of the ribs...
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chris williams
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Location: Blandford Dorset

Re: TYPE 13 PETREL 1/4 SCALE

Post by chris williams »

The wing joiner boxes are 16mm & 13mm respectively. The all-important sub spar is let in against the ply web plates on the front of the main spar (10 minute job per spar)
The sheeting will be 1.5mm hard balsa..
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chris williams
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Re: TYPE 13 PETREL 1/4 SCALE

Post by chris williams »

With both sub spars added, the lower sheeting can be glued in place. Thanks to the gentle gull angle, this can be achieved in one piece...
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chris williams
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Location: Blandford Dorset

Re: TYPE 13 PETREL 1/4 SCALE

Post by chris williams »

In a similar manner to the sub spars, the diagonal sheeting supports at the root are retro-fitted. The wing is weighed down on its jigging supports for the addition of the top sheeting. This, too, can be fitted in one piece, although it will put up a bit of a fight! After clamping the rear of the sheeting to the spar, masking tape at the front will force the sheeting into submission. As a precaution, the inner panel TE is clamped to a straight edge to preserve its integrity...
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chris williams
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Re: TYPE 13 PETREL 1/4 SCALE

Post by chris williams »

Time to close off the wing roots, now...BTW the long sanding block is a very useful tool: this one is simply a length of 6mm balsa sheet with 40 grit strips glued to both sides. This, and the 80 grit version, are good for many jobs, especially where a straight edge is required...
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