Scratch build a SLS?

[sruelle]

Any body interested in the design of their own SLS?

Can show how I have done mine, I have enough pictures to make a short build log

Stephane

[Dean M]

Come on Stephane, lets see it....i'm not affraid to ask.

[Mark Popov-Dadiani]

Well, we're waiting with anticipation.

[SCOTTROD31]

Come on stephane show it to em
ive seen it its purty cool
scott

[sruelle]

Ok, Lets start.

Story started 3 years ago, probably summer 2008 after buying a 1/4 DG800 manufactured by S2G from NESAIL.

Very good kit for the money. The DG800 that is reproduced is a DG800S, and we will see later that it would have been better to pict a DG800A or B. Fuse is the one on DG600 with a skinny boom.

After reading and helping the build of my friends on the GPR website (http://lesgpr.free.fr), GPR stand for Grand planeur Radiocommandés means, Big RC Sailplanes . There is probably a good 10 different type of SLS on the website. I did decided to go for mine, that will be of course different than the other!

I specially liked the one of Jean Poulou that you can find on the link

http://translate.google.com/translate?client=tmpg&hl=en&u=http%3A%2F%2Flesgpr.free.fr%2Faccueil%2Faccueil. htm&langpair=fr|en

pick summary and propulsion hidden

His idea is : as simple as possible, as cheap as possible! Challenging for a SLS!

Finaly I did choose a mix of his SLS and the SLS available from JK

So it will be a parallelogram, with folding prop and the axle will be the main wings joiner!

Now let design it. First step we need to see how it will work and here a CAD program like autocad help a lot for the measurements.

First a picture of the fuselage

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After some work on the sizing

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Stéphane

[Dean M]

Continue!!!! common Stephane stop teasing us.... :)

[sruelle]

Dean,

the trick is how to make a pod without machining anything!

this website helped me a lot

http://www.speedymetals.com/default.aspx

you can find any metal, in any dimentions (by the in or ft) just need to browse what you are looking for.

I just need two pieces here, a thin aluminum pipe that will be used as the mast and a rectangle profile a little bit thicker that will hold the motor.

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Then just need to use a press drill, a metal saw and a metal file.

The rectangle is cut per the cad drawing

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and a roller bearing is inserted on the back as it will act like a pivot, on the front the pivot will be some ball connectors

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Stéphane

[sruelle]

The boom need to be stiff but it does not require a real thick tube to achieve that the thiner the ligther

A brass tube is inserted to be able to screw without any gap the axle between the two roller bearings
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Then the tube is drilled to be able to put the joiner tube into it, later on the tube will be cut in three sections, two that will be fixed and the last one that will spin over the wing joiner

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Stéphane

[sruelle]

Here is how it look when everything is put together

Boom motor socket and stabilizers

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All together at the bench

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I will be in more details as you request and will explain later on how it does work to install all of that in the fuse

Stéphane

[Tom]

Very cool......what is the weight of the unit as it sits in the last picture?

[sruelle]

Difficult to say Tom,

I did not took the weight during the built...

The unit finished with motor esc servo... is about 500g #18oz

Motor is 235g
servo is 115g

Stéphane

[SCOTTROD31]

video of stephanes slshttp://www.youtube.com/watch?v=XwIdOMkO8Gc







scott

[Mark Popov-Dadiani]

Very clever!

[Efin]

Hi all,
I also built my own SLS unit...for 5m ASW28/18
maybe it could be inspirated for somebody.
see http://efins.rajce.idnes.cz/2012_02_08_ASW28_18_E/

[sruelle]

I realize that there is not any pictures of the finished saiplane, so here we go

Picture is fresh from today, I put out the DG800 just after my return from Europe, that is the first time that I fly it this year, just magic with a magic day, look the clouds on the back of the picture. AWESOME, but wish I would been able to come to Delaware... next year maybe

http://www.rcaerotowing.com/forum/attachment.php?attachmentid=11244&d=1345422258

Stéphane

[studioRS]

Guys, here is a 1:10 scale SLS, RMS (Remote Motor System) or properly known as a, "Klapptriebwerk" (retractable engine) that is supplied installed in three different 2m EPO foam sailplanes. These are very accurately represented, work well but, fragile as ever and made out of plastic :( . They are inexpensively built and need modifications to fly well. Once done with modifications (glassed fuselages, strengthened wing spars better hinges, control rods, MG servos, etc), the sailplanes are a complete joy to fly and of course, thermal better because they are light. Slope soaring is amazing too. A perfect sailplane for those { oops HUGE sink moment feeling days... } without lift. Hit the gear switch and up comes a motor - recovery! With my graphic sticker set, fixed working suspension they plain look very, very scale. Purists, don't shrug these off, they fly really well. Also a great way to get someone into the sport for little investment, learn how the dynamics of sailplanes glide through turns and work. The HK ASK-21Mi even has a steerable nose wheel !!, but unfortunately is the cheapest of them all.

http://www.hype-rc.de/shop_image/product/873c3049527e977d620ec72988733048.jpg

My DG-1000
http://www.rcaerotowing.com/forum/attachment.php?attachmentid=11961&d=1347680835

http://www.rcaerotowing.com/forum/attachment.php?attachmentid=11964&d=1347680845

This below photo is not me, nor my DG-1000, but shows it being enjoyed by scale sailplane pilots when they first came out..
http://pierre.rondel.free.fr/images3/DG1000_EPP/images/DG1000_061.jpg
http://pierre.rondel.free.fr/images3/DG1000_EPP/index.htm

ST Models DG-1000 (http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXYYS4&P=ML)
ST Models DG-1000M (http://www.hype-rc.de/deu/shop/product/018-1526/bk-dg-1001m-rtf-bl-lipo-2-4ghz.html) (Europe only for now through Hype...)

HK ASK-21Mi (http://www.hobbyking.com/hobbyking/store/__14895__Hobbyking_ASK21Mi_Glider_EP_EPO_PNF_.html )

I've rebuilt one of these on a DG-1000 with wood, fiberglass, metal strips and CA. The bottom half is still plastic but the top half is wood. Used a different motor (much stronger) and prop. I haven't flown this yet rebuilt, but will report back.

Future project is to take one apart and get the plastic pieces into a CAD drawing so that it can be machined at any scale.

http://www.rcaerotowing.com/forum/attachment.php?attachmentid=12263&d=1347900181

http://www.rcaerotowing.com/forum/attachment.php?attachmentid=12262&d=1347900179

http://www.rcaerotowing.com/forum/attachment.php?attachmentid=12261&d=1347900177