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DART 17r QUARTER SCALE

Let us all watch your new project progress.
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chris williams
Posts: 1438
Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: DART 17r QUARTER SCALE

Post by chris williams »

Now the wing roots can finalised and faced with 0.8mm ply...
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chris williams
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Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: DART 17r QUARTER SCALE

Post by chris williams »

A quick rig to boost enthusiasm, then on to fitting the wings to the fuselage...
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chris williams
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Location: Blandford Dorset

Re: DART 17r QUARTER SCALE

Post by chris williams »

With all the usual alignment tasks completed, the fairings can be infilled with balsa (scrap TE profiles are sometimes excellent for this) and the wings blended to the fuselage with the standard application of polyester filler.... Note that the scale cut-out of the wing TE at the root has been abandoned in favour of a simple straight edge junction to avoid the collateral damage the sticky-out bits can cause in transport. (This issue will be faked in the finishing stage)
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chris williams
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Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: DART 17r QUARTER SCALE

Post by chris williams »

The ailerons are relatively simple, and built flat to the board. The TE at the wing tip is made of blanks of 12mm balsa, shaped to the chord...
The airbrake servo is a tight fit, but is removable... (The servo cost £1.90)
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chris williams
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Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: DART 17r QUARTER SCALE

Post by chris williams »

Now for the canopy: this is held in place with three 8mm magnets front and rear. The instrument binnacle is attached to the canopy to give good access to the fuselage for fitting and removing the LiPo...
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chris williams
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Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: DART 17r QUARTER SCALE

Post by chris williams »

I seem to have lost the pics for the airbrakes, so I've substituted the ones from the current project which are near enough identical... Note that in extremis, the whole assembly can be removed if necessary at any stage.
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Andrew Ray
Posts: 89
Joined: 19 Mar 2015, 19:15
Location: Staffordshire

Re: DART 17r QUARTER SCALE

Post by Andrew Ray »

Chris, I have a question.

When you build the wing it is framed up flat on the board, lower sheeting added and at this point the wing is still quite flexible. You then jig it up to add the top sheet which locks in any washout, I presume there is washout? You then build the aileron flat and match the wing tip to the tip of the aileron but what happens to the washout? I am trying to visualise it with difficulty. I am used to building the ailerons as part of the wing and then separating them which can be fiddly.

I have always built airbrakes with the arms boxed in so that the pivot is supported at both the front and rear of the airbrake arms, you seem to use a screw through the arms so that the airbrakes can be removed if necessary. I presume has been trouble free?

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Peter Balcombe
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Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: DART 17r QUARTER SCALE

Post by Peter Balcombe »

Andrew,
I suspect that in common with most of the CW designs over the past few years, Chris has used an HQ section - so no need for any washout to be built in.
No doubt CW will confirm or otherwise :)
Peter

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

Re: DART 17r QUARTER SCALE

Post by chris williams »

That's right, it's been two or three decades since I built a wing with any washout...

The airbrakes are a cast iron son-of-a-female dog to get to close properly, but once they do I've never had to re-visit them. (There: I've been and gone and said it now!)

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Andrew Ray
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Joined: 19 Mar 2015, 19:15
Location: Staffordshire

Re: DART 17r QUARTER SCALE

Post by Andrew Ray »

Okay, thanks. In all my years of building models I am still learning and I would never have considered building a model without washout and I now appreciate that the wing section used doesn't need it.

I hope I haven't jinxed the airbrake by asking :(

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