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Nemere scale 1/6
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bocorvin
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MessagePosté le: 07/10/2015 10:49    Sujet du message: Nemere scale 1/6 Répondre en citant

Hello everyone, I am Vincent de Bode from Holland. I can speak and understand French and German, but writing it is difficult for me. English is easier, but it is still a foreign language for me, so excuse my mistakes.

I participated Retroplane this year with a Nemere scale 1/8, wingspan 2.50, built in balsa and coloured to give it a ply look (hopefully). Having seen all those models built in ply, I decided to build a Nemere covered with ply to give a more realistic model. Also I liked to have it bigger, but not too big. I figured out that scale 1/6 gave a wingspan of about 3.30m, which suited me well. Luckily my friend Rob could digitalise the wing and another friend Adrie could cnc the wingribs, which made building much easier. I enlarged the drawing from the Nemere by 33% which gave me (almost) scale 1/6


The difference between 1/8 and 1/6 is quite substanciel and the nose of the damaged Nemere still needs a paintjob!
Through reading on the forum I realised that ply could be bent sharply and I decided to make the fuselage frames from laminated ply strips (which I happened to have)





Laminating frames goes very quickly and is quite accurate, can be reinforced where needed.

[img]
The frames were set up and stringers added and glued with epoxy plus filler. The plan is to have the frames beefed up with balsa and a gusset plate gf 0.6 ply so I can butt joined the ply covering.






I also made a scale coupling hook from brass strip, 2mm aluminium, 4mm square brass tube and 0.9mm hard brass wire.


In the meantime Adrie cnc'ed the wingribs Very Happy

and I added the servo mounts. Next I start to build the wings, my aim is to have it finished before Retroplane 2016 [amen]


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VincentB
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MessagePosté le: 07/10/2015 11:35    Sujet du message: Répondre en citant

Bonjour Vincent,
On va suivre ta construction avec intérêt [good] joli travail de lamellé collé sur les couples, ton crochet est super aussi [clap]



Retroplane the World Touch - On the Web since 1854.
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bocorvin
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MessagePosté le: 07/10/2015 12:04    Sujet du message: Répondre en citant

Merci Vincent! Un ami a construit un bateau de onze mètres avec des couples lamellés, ça marche bien!
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Johannes
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MessagePosté le: 07/10/2015 13:04    Sujet du message: Répondre en citant

Hallo Vincent,
sehr schön die Bauart mit den schichtverleimten
Spanten, [good]
dadurch sieht der Rumpf sehr schön zierlich aus Very Happy

Johannes
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Clifton
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MessagePosté le: 07/10/2015 23:28    Sujet du message: Répondre en citant

[good2] Very nice job for a beautiful sailplane. I'll followed your job with a lot of interest.


Slingsby Petrel, à mon gout le plus beau de tous, quoi que le Fafnir ... Ah ces ailes en mouette, un jour ....

Rien de ce qui est fini n'est jamais achevé tant que tout ce qui est commencé n'est pas totalement terminé (Pierre Dac)
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bocorvin
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MessagePosté le: 16/10/2015 19:08    Sujet du message: Répondre en citant

Merci pour tous les encouragements!, je continue en Anglais!
Before starting the wing I needed to make the spoilers, because they where not on the plans. I made the spoilers out of 0.6 ply, on top a spruce batten of 8X3 mm. On the ply I glued pieces of 2 mm aluminium in which I drilled and tapped holes for M 2.5. The ply was thicked up with 2 mm balsa to give it an even surface.









The actuators? are made of PCB with brass tube soldered in. Now the actuation itself; in my Nemere 1/8 I had two destroyed servo's. Because the actuation needs to be very stiff to retract the spoilers completely, it needs to be 100% accurate trimmed electronically. This is critical, I made a small trimming eror, the servo's buzzed, and where gone javascript:emoticon('Crying or Very sad')So I tried to find a different solution; when I should add springs to the spoiler to close it and make a lot of play in the actuation, the trimming should't be critical any more. So I made springs out of 0.3 steel wire and some tiny loops in the spoiler casing of 0.2 mm steel in which the springs rested. You can see on the foto a circulair servo arm? wheel? with a slot hole, that should give ample play! Of course the spoilers will go in the casing turning on 3mm axles, you can see that in one of the pictures of the wing.

Now back to the wings, with the wingribs already CNC'ed, I had to scarf the spruce for the spar.

The spar itself is made of 3 layers 2X10, changing in 2 layers 2X10 to a single 2X10 batten at the tip. In a couple of days the basic stucture of the wings was completed.






Next will be the ailerons!
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bocorvin
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MessagePosté le: 23/10/2015 13:52    Sujet du message: Répondre en citant

Last week I had a lot of time, so I started with the ailerons
A big challenge were all the gusset plates. Sixty per aileron!, (top and bottom). I can't make that neatly javascript:emoticon('Confused')!
Luckily I read the article from Eric Spore; "NEMERE 1936" on this forum. In his kit of the Nemere the upper and lower surfaces were CNC'ed ply.
That brought me on an idea. All I had to do was jigsaw them.
I took 4 pieces od 0.6 ply, glued it in three spots together outside the perimeter of the aileron, (its on my last picture of the ailerons). On top I drew th aileron and started sawing with a very fine sawblade.



. In the middle my jigsaw was to short, so I had to cut some.

. It took me a lot of time, but I was cutting all 4 in the same time, great confort!





. I glued on the spruce batten on front, balsa ribs and a balsa trailing adge. I sanded it all into a triangular shape.

. Next I glued the top on it and I had the basic aileron.

On this picture the glued spots are marked, just to make it clear what I meant.

. Next will be the tailsurfaces, a bientot.
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bocorvin
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MessagePosté le: 04/11/2015 23:41    Sujet du message: Répondre en citant

I started with the horizontal tailplane. Because it is elliptical it was to complicated for me to CNC the ribs. I took a shortcut, made the trailing edge of ply, jigsaw again, glued 3mm balsa on both sides. Made the ribs square of 3mm balsa with only a cutout for the spars.

I pinned the leading and trailing edge at half the profile thickness on my building board.

In the three central ribs I made reinforced holes for the connectors. Checked it with the actuator in place.

I made all the ribs fit to the trailing and leading edge, glued in the top spar.

added the tips and upper spar. took it of the board, sanded into a symmitrical profile and covered the nose with 2mm balsa.


Now the verical tailplane, it went about the same. The only difference is the tip, which was laminated from veneer. Later it will be visible.





Next I needed hinges and I made them just as on my 1/8 Nemre, just a bit stronger. I started with an nickle silver (brass is just as well, I happend to have this stuff) strip of 3mm wide and 0.4 thick. Folded it around my pivoting wire (0.9 steel)

and pressed it with a big forceps around this wire.

. Put some grease on the wire and soldered the strip. Later I wrenched out the wire and reamed the hole a tiny bit to give a nice fit.

I glued them in the rudder and the fixed part, these much longer so it will be possible to close the gap (as the original)





Next step was covering with ply, never done that! Luckily I could find a lot on this forum about the bending of ply and indeed, at the moment I poured boiling water over the ply, it bended so easily! Thank you forum! The gluing was quite nerve wracking, but after a couple of mistakes it went on.



. Friday I hope to start with the aileron actuation, a bientot!
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DOMINIQUE DIOT
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MessagePosté le: 05/11/2015 08:43    Sujet du message: Répondre en citant

nickel [clap]


Lorsque on est encore en l'air, c'est qu'il est encore entier.
Dominique
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Walter L.
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MessagePosté le: 05/11/2015 19:25    Sujet du message: Répondre en citant

Good luck for the following steps.

It will become a very nice model.

Best regards
Walter
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bocorvin
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MessagePosté le: 11/11/2015 15:53    Sujet du message: Répondre en citant

Merci Dominique pour les encouragements and thank you Walter for your nice comment!
First some pics of the hinges of the rudder, I use a wire which spans all the hinges and it sometimes tricky to get it in, I made some guidance from 0.6 ply,

cut it al lot smaller and glued it on the rudder.



.
I also glued 6mm balsa cut of to 45 degrees on front of the rudder and sanded it round.


For the picture I laid a strip of ply on the fixed part of the rudder just to get an impression what it should look like.


Now I had to do about the same with the ailerons. First I made a rebate in the trailing edge in which the strip ply, which should close the slot, would fit. Out of some scrap material I made a sand contraption and sanded the rebate.






With a shortened saw blade clamped into a handvice I made the slots in the spruce front of the aileron and glued the hinges in. The hinges in the trailing edge were done about in the same manner. In one wing I folded the doubling of the hinge out, in the other wing I reinforced it with some small pieces of ply.The wire , 0.7 mm steel, was more difficult to get trough all the holes.






I glued bals on the front of the aileron, sanded it round, made some gaps for the hinges.


for the picture and to see if all fits I laid a strip of ply over the gap.

.
I already made some parts for the aileron actuation, I hope to start with that! A bientot!
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caralp_laurent
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MessagePosté le: 11/11/2015 23:52    Sujet du message: Répondre en citant

Hello Vincent,
Beautiful building ! The 1/6 scale gives a good span for all slopes Wink

Lolo



Lolométéo, rétro addict ;o)

"On commence à vieillir quand on remplace ses rêves par des regrets"
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bocorvin
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MessagePosté le: 17/11/2015 21:09    Sujet du message: Répondre en citant

Merci Lolo, malheureusement il n'ya pas baucoup des pentes en Hollande javascript:emoticon('Sad!
About the ailerons, the original Nemere was actuated with two segments and cables. I think it was the only way to control the twist (and flutter)in the big ailerons. The problem in the model is the thickness of the wing on the spot where the actuation is.

on that spot it is 15 mm thick, I can't get a servo in it. I thought to get more resistance against torsion in the aileron, but I didn't found a easy solution. I realised when I should couple both actuators (like the real thing) the aileron would become very stiff. I made a jig out of ply and jigsawed the bellcranks, pre drilled with 0.7 mm holes, later drilled or reamed to the required diameters.




This are the CNCed segments and a epoxy bellcrank

All the bellcranks must have the same throw.

I tried to put the bellcranks in line with the push/pull rods to the aileron to minimize slob.
The rod to the aileron segments (rudderhorn) is 1 mm, in two pieces connected with a carbon tube which will be glued after the oratex is put on.


This picture is just to make it clear.

I use a reamer to get a nice fit. Now you can see the servo, both coupled bellcranks who actuate the aileron






The big gap with the girder will be filled later!

This is how it looks on my 1/8 Nemere.
Finishing the segments and planning it so that I can oratex it before putting the aileron, part of the push/pullrod and segments in place,.





I also made some servo mounts.





I put the servo in place connected with a 0.7 steel wire stiffened with a carbon tube.






Now another thing; the spoilers. I made springs to close the spoiler ( see much above) just to prevent servo's destroying itself (yes it happened). ('Crying or Very sad'). On this foto you see an easier solution. In the (blocked) closed position I positioned the servo arm horizontally.

now the spoiler is under tension, the servo is at rest an it can be blocked. ('Very Happy')


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DOMINIQUE DIOT
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MessagePosté le: 17/11/2015 23:43    Sujet du message: Répondre en citant

[clap] [clap] [good]


Lorsque on est encore en l'air, c'est qu'il est encore entier.
Dominique
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MessagePosté le: 22/11/2015 21:57    Sujet du message: Répondre en citant

Merci Dominique pour les smiley's!!, je continue le progres de mon Nemere, en Anglais..
Having completed the basic structure of the wings, I could go further at the fuselage. I use an enlarged plan of my Nemere 1/8, which was covered with balsa. I changed some things (later it appeared not all!) so it could be covered with 0.6mm ply.
I started with the wing joiner.

10 mm dia alu tube for the 8 mm carbon wing joiner, front and back ply, top and bottom 10 X 3 spruce, filled up with balsa and epoxy with microballoons. I wanted to glue this contraption between two frames. Sadly there was only one frame, so I laminated a second (partial) frame.

. It is checked if it is horizontal and square.

. Now with the aid of the ribs I put the rear beam in.



I wanted 3 mm balsa as base, so I made a rebate on the frame just behind the pilot, as support for the ply and specially the fairing with the wing.



. Now the wing "stubs"could be aligned.






I never covered a model with ply, so I hesitated starting with that. First I filled up the frames between the girders with balsa , sanded it down and glued ply (as a gusset plate) on it. Thanks to the articles of Eric Spore I managed (after a few failures) to get the panels on.







. It appeared that the fisrt part behind the wing was longer than the original, so I tore it out, laminated an extra frame and covered it again.





. Another part which I feared was the nose, I thought using 0.6 mm veneer instead of ply, you can sand it without changing the colour. First I filled in the space between the two front frames and made a balsa nose, which was already hollow for the ballast later.





Sanded it in shape (took some time!)

Put on the veneer with thick cyano.







There aren't much pictures of the real thing..

I was quite happy I got it on!


a suivre.


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