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/translat...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



After some work on the sizing



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.




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

The rectangle is cut per the cad drawing



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







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



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






Stéphane

[sruelle]

Here is how it look when everything is put together

Boom motor socket and stabilizers




All together at the bench






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?