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Swoop. 1.2m aerobatic slope soarer

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Dan Workman26/06/2020 12:55:06
62 forum posts
144 photos

After having a brief go with a dreamflight Ahi, and liking it, i thought would it be possible to design something with similar flight characteristics out of balsa? This is my first attempt, its all built now just need to cover and chuck it off a slope. Another motivation was maybe to sell a few kits, so hopefully it flies well enough to put it into production.

Anyway this is it so far. Its mainly 3/32 laser cut balsa. Bit of 1/4" for the tail.

Its light at the moment at 137g, so is probably going to come in under the targeted 350g

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Can of Stella for size reference! Its 1.2m span

Phil Green26/06/2020 17:41:53
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1616 forum posts
343 photos

Beautiful Dan - clearly a candidate for transparent film laugh

Ron Gray26/06/2020 17:45:11
2235 forum posts
978 photos

Dan that is gorgeous, up to your usual standard and you can see the Dan DNA in it. Looking forward to the flight reports.

Dan Workman26/06/2020 18:51:02
62 forum posts
144 photos

Cheers guys, yes it will be covered in transparent, be a shame to cover it up!

Im waiting on servos for it, so maybe next weekend it will be ready, then i'll need to find a good slope!

Malcolm Fisher26/06/2020 19:33:03
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644 forum posts
7 photos

Looks good. I would like one. Any idea what the kit cost would be if it goes into production?

Malcolm

Ron Gray26/06/2020 20:00:13
2235 forum posts
978 photos
Posted by Dan Workman on 26/06/2020 18:51:02:

Cheers guys, yes it will be covered in transparent, be a shame to cover it up!

Im waiting on servos for it, so maybe next weekend it will be ready, then i'll need to find a good slope!

Or stick a motor in its snout. No hills here on the Norfolk / Suffolk border

Dan Workman26/06/2020 22:18:59
62 forum posts
144 photos

Malcolm, i'm not entirely sure yet as i've already got a list of modifications to make, for ease of build and for rigidity. So not sure yet how much wood and laser cut time there will be for the final version. What i was looking to offer though was a full wood kit, ie more than a short kit so it has all the wood you would need to build it and leave the buyer to provide hardware, electronics etc

Ron, maybe a powered version will come shortly after. Depends how easy it is to strap a motor on and make it look pretty at the same time!!

Dan

Dan Workman27/06/2020 13:15:18
62 forum posts
144 photos

Few coats of halfords spray cans before covering with clear oracover...

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Peter Jenkins27/06/2020 13:29:07
1624 forum posts
305 photos

A novel idea Dan! Really interested to see how that works out with clear Oracover! Be interesting to use the same technique on decorating an all sheet structure - like an F3A model!

Ron Gray27/06/2020 13:55:53
2235 forum posts
978 photos

Now that is clever as it will give a 3D effect due to the colours going into the structure.

Edited By Ron Gray on 27/06/2020 13:56:48

David Ashby - Moderator28/06/2020 07:16:39
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11035 forum posts
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617 articles

Looks great Dan, following with interest thumbs up

Dan Workman07/07/2020 23:13:18
62 forum posts
144 photos
 
Tried to maiden at the weekend but it was too windy. Took it down the field last night in the flat calm and it went pretty well, looking forward to getting it on the slope!

 

Edited By David Ashby - Moderator on 08/07/2020 05:59:25

David Ashby - Moderator08/07/2020 06:00:05
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11035 forum posts
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Looks promising thumbs up

Steve Houghton 108/07/2020 08:56:44
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1920 forum posts
128 photos

Looks great with the painted balsa & clear oracover, although my slope experience tells me that the vegetation on some slopes can be a bit course and can make little rips & tears in thin coverings, (not all slopes have long, lush grass), so for me I'd be tempted to cover the wings at least with a very thin lam film.

Nigel R08/07/2020 10:04:29
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3987 forum posts
722 photos

Very nice Dan.

How did you do the rib alignment in the wing? They're all at different angles, is it a self jigging sort of structure?

Dan Workman08/07/2020 13:18:53
62 forum posts
144 photos

Steve, i used oracover lite which was great to use, it will probably get a tear here and there but being clear you'll barely see any repairs. Darker colours maybe. I've never used any laminating film, how is that applied?

Nigel, they all push into slots on the leading and trailing edge and on the spar. Once thats on you then add the top and bottom spars, l.e sheeting etc.

MattyB08/07/2020 13:53:20
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2104 forum posts
32 photos

Looks impressive - a mix of Ahi, Phase 6 and my old favourite the Limit EX. Stick and underslung fin on and that will DLG even better from the flat; it might help knife edge on the slope too! Fishy fishy fishy…

 

Edited By MattyB on 08/07/2020 14:05:52

Steve Houghton 108/07/2020 15:38:57
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1920 forum posts
128 photos
Posted by Dan Workman on 08/07/2020 13:18:53:

Steve, i used oracover lite which was great to use, it will probably get a tear here and there but being clear you'll barely see any repairs. Darker colours maybe. I've never used any laminating film, how is that applied?

Dan - Lam film is ironed on, but in the opposite fashion to Oracover in that you start ironing from the middle and work your way outwards as it doesn't shrink. So for example, if I'm covering a foam wing I no longer use GF cross weave tape but iron on a fairly thick, (70 micron) laminating film, which will really stiffen the wing but it has enough flexibility to be ironed around curves. I then roughen up the surface with glass paper before applying my choice of coloured iron on film. Once that is done I then apply a 40 micron layer of lam film over the top. This may seem like overkill but it works great, protects the coloured film and years later my foamie gliders still look as good as the day I built them. I have also used the lam film for hinging as well, like a live hinge, where I've extended the lam an inch over the TE and onto the control surface.

 

Edited By Steve Houghton 1 on 08/07/2020 15:39:45

Ron Gray10/07/2020 10:33:04
2235 forum posts
978 photos

Laminating film does shrink! But you need more heat than with covering film. I use 38 micron and it covers solid and built up surfaces really well and is very strong, much stronger than film. The other nice thing with it is if you need a hole for, say a cable, then you can just heat up a piece of wire and push it through. It will melt the hole through the lam.

Steve Houghton 110/07/2020 11:34:15
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1920 forum posts
128 photos
Posted by Ron Gray on 10/07/2020 10:33:04:

Laminating film does shrink! But you need more heat than with covering film. I use 38 micron and it covers solid and built up surfaces really well and is very strong, much stronger than film. The other nice thing with it is if you need a hole for, say a cable, then you can just heat up a piece of wire and push it through. It will melt the hole through the lam.

Shrinking has not been my experience, or if it has then it's not been noticable. Maybe I just don't have my iron set as hot as you. I tend to use a lowish setting, (120° at first to adhere it to the wing, then increase the temperature and go over it again at about 140° C. Maybe I haven't noticed shrinkage as I've only used it on foam wings and not a balsa framework?

Edited By Steve Houghton 1 on 10/07/2020 11:34:35

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