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Chilli Wind Built - up wing.

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Stuart Quinn-Harvie 109/01/2019 19:39:07
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108 forum posts
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Hi folks, I am about to start a Chilli Wind build ( I still have my free plan! ) and I am keen to do a built up wing. I am FAIRLY sure I could knock one up well, but I believe that you can never have too much knowledge or other people's experience :D

I would be really interested to hear/see how anyone else has made one - how many ribs, material sizes used and so on.

Thanks for any information anyone might be able to provide

Nigel R09/01/2019 19:59:54
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2720 forum posts
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Mine is...


10 ribs. Equally spaced. All 3/32.

1/4 square hard balsa spars. 1/16 webbing. 1/4 leading edge and trailing edge. 1/8 false leading edge and false trailing edge.

Fully sheeted with 1/16.

Solid ailerons as per plan.

Joined with medical bandage and pva.

Has survived a crash that totaled the fuselage!

Hope that helps.
Stuart Quinn-Harvie 109/01/2019 20:34:57
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108 forum posts
81 photos

Thank you Nigel! That sounds lovely and simple. Two spars - one top one bottom and ten ribs per panel? I particularly like your joining method: I have always been very paranoid about wing joins and gone for epoxy and glass - I will try that. How did you cover it? Iron on or nylon?

Gutted to hear of your crash, BTW

Cheers again!

Stuart Quinn-Harvie 109/01/2019 20:39:17
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108 forum posts
81 photos

BTW, I am just going through your thread on the SCEN Puma - superb work Sir!!

Nigel R10/01/2019 15:19:06
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2720 forum posts
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Thanks Stuart smiley

The Chilli was all my dad's work (as was the crash!). He liked it enough to make another fuselage, but then didn't fly it much and it's come my way since then.

The usual glass/epoxy wing joining kit is somewhat overkill. I've never had issue with PVA and bandage, although these days I use PVA and glass tissue. One wide layer and one narrower layer, on a Chilli size build that would be around 12" and 6". It's covered in Solarfilm, no extra strength needed with a fully sheeted job.

Must get the Puma out of semi-retirement and back in the air.

MikeQ10/01/2019 15:32:57
77 forum posts
70 photos

Hi

cant remember is it the smaller of the two ... Chilli Wind and ChilliBrezeze.. I've had two of the smaller ones with built up wings and they were superb flyers.

I think I might have a copy of the original article for the bigger one.

Cheers

Mike

Adrian Smith 110/01/2019 15:59:14
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2151 forum posts
835 photos

Both versions are cracking models. Chilli Wind is the bigger of the two. My Breeze had built up wings while the Wind had foam core jobs. laugh

Edited By Adrian Smith 1 on 10/01/2019 15:59:35

Nigel R10/01/2019 16:56:49
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2720 forum posts
445 photos

Chilli Wind plan and article are on outerzone:

**LINK**

The smaller one (Breeze) already had a built up wing shown on the plan.

And, yes, 10 per panel (so 9 bays), and 1/4 sq hard balsa spar top and bottom at the thickest point of the rib.

Stuart Quinn-Harvie 110/01/2019 18:10:08
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108 forum posts
81 photos

Thanks everyone. Anyone know what issue the smaller one was in?

Thanks again Nigel - again, nice and simple.

kc10/01/2019 19:32:58
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168 photos

Chilli Breeze ( the smaller one ) was in RCME June 1994. A copy for sale here

Note that if you have a free plan ( i.e. pull out plan from the magazine) it's the small one. The larger Chilli Wind was a plan to be purchased, not a pull out plan.

Stuart Quinn-Harvie 110/01/2019 19:38:00
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108 forum posts
81 photos

Cheers KC. I will have to check to see what I actually have - I seem to be a bit confused... about time for the dried frog pills, I think.

kc10/01/2019 19:43:09
5859 forum posts
168 photos

I seem to remember there was some confusion of the two sizes in an earlier thread and info was given incorrectly.

If the build is of Chilli Breeze then build as per plan, but if the larger one consider spruce spars with a ply joiner and forget about bandages or fibreglass.

Stuart Quinn-Harvie 110/01/2019 19:49:24
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108 forum posts
81 photos

Hmm, I have the plan for the big one ( wind) I have no idea where it came from, I just assumed it was the free one: It must have come from a load of stuff I bought a few years ago.

kc10/01/2019 20:50:56
5859 forum posts
168 photos

Well you could construct a built up wing in the same way as many aerobatic models of the same size. Or you could still get a foam wing cut by suppliers such as Bill Kits. Also a foam tailplane.

Nigel R11/01/2019 08:56:37
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2720 forum posts
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Posted by kc on 10/01/2019 19:43:09:

If the build is of Chilli Breeze then build as per plan, but if the larger one consider spruce spars with a ply joiner and forget about bandages or fibreglass.

The spars are not "in line", they sweep back, so a ply joiner would not be as simple. The Breeze structure is regular D Box with full sheeted centre section - so plenty of material for a glass or bandage joint to work on.

Worth noting glass joins have a secondary bonus of reinforcing the surface around the point where the wing dowel and bolt are.

The structure I listed is as per my larger Chilli Wind. Spruce 1/8" x 1/4" would be a good spar, as an alternative to rock hard balsa of 1/4" x 1/4".

For what its worth, if I'd built it I would have used a liteply root rib, slotted at the front, to take the wing dowel.

Many ways to skin the cat!

kc11/01/2019 10:33:07
5859 forum posts
168 photos

Well 3/16 sq spruce would be better than 1/8 by 1/4 because of greater gluing area for the webbing and the ply joiner. Actually I would prefer 1/4 sq spruce on an aerobatic model, save weight on other things not the spars. Getting really hard balsa for spars is not easy and spruce is not much heavier. If the spars are not in line then tapered infill pieces would be used to glue a straight ply joiner onto the spars. Or relocate the spars to be in line.

I note that the instructions for the Chilli Wind suggest that it could use a flat 1/4 balsa tailplane instead of foam. Much easier!

alex nicol11/01/2019 11:13:33
243 forum posts
6 photos

Hi Stuart,

I currently have a chilli wind under construction, with a built up wing & also incorporated a set of electric retracts. Unfortunately its fully constructed so not much to see..

I used a full depth spar made of very hard 1/8th balsa Half slotted the spar & ribs & capped it off with 1/8th x 3/8 to form girder type section. I also added a 1/8 x 1/4 spars towards the TE. then built the whole wing & cut the ailerons out.

I also decided to opt for a built up tail as opposed to the 1/4 sheet version I'll stick some pics up shortly

Cheers

Piers Bowlan11/01/2019 11:23:43
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1753 forum posts
42 photos

I bought the Chilli Wind plan from Sarik (1648) and the MAY 91 RCM&E magazine build article from the internet. I will do a built up wing sometime, probably using 1/4in spruce and I am considering a laminated ply joiner. The model looks fast just standing still but is not at the top of my build list at present. Peter Miller's Little Miss Honky Tonk should be out in the next few days so that could be next. I will be following your Chilli Wind build with interest Stuart, if you are planning to do a build blog.

alex nicol11/01/2019 11:37:49
243 forum posts
6 photos

Forgive the photography, pics of my build below

chilli wind 2.jpg

chilli wind.jpg

Piers Bowlan11/01/2019 12:14:46
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1753 forum posts
42 photos

Very Nice Alex, which retracts are you using?

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