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Danny Fenton24/02/2019 22:11:59
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9077 forum posts
3928 photos

A bit more detail on the cunning disguised in these simple beasties:

The OD is 20mm as I said, the od of the output shaft is 10mm. the hole in the centre is 2.5mm and that is the diameter of the piano wire in this instance.

There is a recess on the flange that faces the servo disc to accommodate the bulge of screw head. the servo screw is trapped between the alloy disc and the servo output disc. The servo disc is fixed to the alloy top hat via 2 x M2.5 screws.

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Cheers

Danny

Danny Fenton28/02/2019 19:58:19
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9077 forum posts
3928 photos

Not much to report other than the wings and ailerons are sanded to shape. I ordered some melamine online for the RDS pockets and it arrived today. It's not melamine it's plastic.... so thats a fiver wasted and its gone in the bin.

I had a rather more concerted look in the garage and this time I did find some. Not the roll I was looking for but a toll none the less. You get a roll with worktops when you buy them, so that you can edge them. Most people throw them in the bin. Don't do that, squirrel it away. But don't do a me and forget where!

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So hopefully tomorrow I can make up the pockets and get the RDS installed

Cheers

Danny

Tony Bennett28/02/2019 20:06:42
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5071 forum posts
129 photos

ooh. i shall watch how you do it with great interest.

not started my ailerons yet.

Tony B

Martian01/03/2019 10:14:57
2173 forum posts
1058 photos

But is that the colour melamine you wanted Danny

McG 696901/03/2019 10:39:10
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2482 forum posts
976 photos

As Danny seems to be choosing a camouflage deco for his Yugo Fury, the melamine with its 'urban camo' scheme is a perfect match I think, Martian. cool

Especially at the inside of the RDS ply box... wink

Cheers

Chris

Danny Fenton01/03/2019 23:22:25
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9077 forum posts
3928 photos

Ahhhh I will have to keep you all in suspense I am afraid. I am still pondering the subject, the Yugo Fury is not cast in stone yet, nor is the undercarriage.

I am going to have a quick go at the forward cowl ring in litho plate. It looks to be the toughest bit, if it's a mare at this scale then maybe I will go back to camo. However if it goes okay a shiny nosed one may be back on the cards.

Cheers

Danny

Danny Fenton02/03/2019 22:08:06
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9077 forum posts
3928 photos

did a little more on the RDS setup. Its a fair bit of faf making the bits, but only took an hour or so.

First rectangles of 1/16th ply were cut, you need a pair per box and one box per aileron. If you want to know the size of the pockets, I drew around a 2 x 4 pice of lego teeth 2

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The laminate is cut so that the width is the same, but the length is about 6mm shorter.

The laminate is glued to the ply, leaving the ply at each end free of glue if possible. I used 15 minute epoxy, used sparingly.

I stacked all the parts between two blocks of steel, my small 90 degree engineers squares in this case, and clamped them in my modelling vice.138.jpg

Once dry they were cleaned up to ensure no glue was going to ruin the joint of the end pieces of ply that seperate the two sections. small lengths of 3mm x 3mm spruce were glued to one half of each pair.

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Two lengths of piano wire were cut and cleaned with some emery paper. The were then pinned to the bench and used to set the height of the spacer blocks.

I sanded a small amount off the spacers so that the laminate touched the piano wire, then glued and weighted everything down.

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The object of the exercise is to make the pockets an accurate fit for the piano wire, it should slide in the pocket but not move up and down at all.

The piano wire is yet to have the bend formed. I will do that when the aileron hinges are fitted and the exact hingeline found.

Oooo I made two more RDS adapters for MF, getting quicker at making them, these only took a couple of hours. I discovered I can make two together then seperate them before drilling and tapping.

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Cheers

Danny

Danny Fenton05/03/2019 00:52:06
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9077 forum posts
3928 photos

Okay I have struggled with those blessed hinges. In the end and having admired Stuarts lovely work, I have reverted back to the glass board hinges.

I drilled the horns to accept some brass tube bushings, this was sanded flush, and a section of piano wire cut over length to thread right the way through from root to tip. This will not remain in one piece, but two, one will feed in from the root, and one from the tip. They will not quite meet in the middle as that is where the RDS box is going to be.

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I mounted the aileron part of the hinge first, with a tiny dab of CA until I was happy with the allignment. I had to sand all the upper hooks from the wing mounted portion of the hinge, and make them narrower to fit between the spars.

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All in all I made a bit of a pigs ear of it, but in the end the aileron sits nicely both above and below the wing. And falls under it's own weight, so not all bad, but what a lot of time faffing! Just the other side to do then its those blessed RDS pocket to fit....

Cheers

Danny

Edited By Danny Fenton on 05/03/2019 00:54:53

Danny Fenton05/03/2019 13:50:16
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9077 forum posts
3928 photos

Managed a little time to look at the RDS box. The important thing with RDS is that the bend in the piano wire torque rod MUST sit on the hingeline. The box needs to sit behind that line but the slot must point straight at that hingeline.

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If you look at the section of the aileron you can see that the 1/16 sheet core sits just under the hingeline. I cut through this core and added a doubler underneath so that the box sits with its base level with the 1/16 core base. I relieved the leading edge to allow for it to move forward closer to the hingeline. This was to also allow clearance for the aileron covering. You don't want it sagging onto the box or it would look un-sightly.

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Cheers

Danny

Danny Fenton05/03/2019 17:41:46
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9077 forum posts
3928 photos
Just a quick video to show the aileron waggling, the bend is around 38 degrees and gives lots of travel.
 
Cheers
Danny

Edited By Danny Fenton on 05/03/2019 17:43:03

Edited By Danny Fenton on 05/03/2019 17:44:28

Edited By Danny Fenton on 05/03/2019 17:50:42

McG 696905/03/2019 18:07:47
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2482 forum posts
976 photos

Superb job as usual, Danny. smiley

I can just look at it and enjoy deeply.

Cheers

Chris

Danny Fenton05/03/2019 18:23:34
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9077 forum posts
3928 photos

Thanks Chris, a lot of faff but elegant, and nothing visible....

Cheers

Danny

Danny Fenton05/03/2019 18:25:41
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9077 forum posts
3928 photos

Thanks Chris, a lot of faff but elegant, and nothing visible....

Cheers

Danny

Tony Bennett05/03/2019 18:30:56
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5071 forum posts
129 photos

lovely work as usual sir.

bit too complicated for me .

works well.

Tony B

Danny Fenton05/03/2019 21:54:32
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9077 forum posts
3928 photos

Thanks Tony I think not

A couple of shots that got missed today

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Just got to try and do it all again on the other wing.

At least there are only two ailerons wink 2

Cheers

Danny

Martyn K06/03/2019 10:53:43
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4845 forum posts
3532 photos

Hi Danny

Have you slotted the servo mounting plate into the ribs or is it just a butt joint?

Have to admit that I do really like the elegance of the solution.

Martyn

Danny Fenton06/03/2019 11:12:51
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9077 forum posts
3928 photos

Hi Martyn the plate is just butt jointed. I may add some 1/8 square triangle stock underneath, to just spread the load a little. Though it is plenty strong.

I am surprised more modellers are not using RDS, though it does rely on accurate building, maybe that puts people off?

A friend is trying some very hard plastic in his 3D printer to try and make the "top-hats"

Cheers

Danny

Jose L. G.06/03/2019 12:00:01
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179 forum posts
133 photos

Nice work Danny !

I´ve used the RDS system in my competition/Composite gliders. Not in scale subjecs.

Recently I don´t have more RDS sets, so I am not able to use it again. I`ll have to think about amini Lathe. Ummm.

I bought a few RDS sets for Futaba servos. Now I have no more in stock.

Jose Luis

Danny Fenton06/03/2019 14:00:50
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9077 forum posts
3928 photos

Nice one the universal ones will clamp to any output disk so they are useful.

They are a neat way to hide all the controls, without fore going strength or accuracy.

Cheers

Danny

Danny Fenton06/03/2019 14:04:39
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9077 forum posts
3928 photos

Chris Bott spotted these the other day and might be worth a look.

Anybody know how to cut splines on the inside of alloy tube?

Cheers

Danny

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