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Aug 20, 2013, 07:18 PM
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limmacslim's Avatar

Sbach 342, profile quick build 36" plans

This is my profile Sbach 342. I searched & found a few different sbach's knocking around here but thought I would share my plans incase anyone is looking for a simple park sized profile version that flies on a blue wonder sized motor.
Im a bit of a noobie with the 3d stuff but it does fly good . Its stable, floaty & makes a nice 3d trainer, very easy to prop hang, harrier & jack knife but has its own small quirks. In general its pretty easy going & I think for a learner would be easy to fly in a sporty fashion, a heavier & quicker sport setup would probably also work well.

Its made with 6mm depron, 92cm / 36" wingspan, 79cm / 31" length. AUW should be around 250g (around 5.9 oz/ft² WL, 4.8oz/ft² CWL), my one came out at 260g.
My current setup is a rewound 1300kv blue wonder motor, 9x3.8 prop, 12a HW esc, 3x 9g servos, 450mah 3s lipo, 4ch frsky rx.

The wing is marked at 30% of the MAC which makes a decent (slightly nose heavy) starting point for the CG, I found it needed to be roughly 10mm rearward for level flight both inverted & normal way up.
I have a 6mm hollow carbon rod for the wing spar & too much hot glue, the motor area is setup for a blue wonder & may need enlarging for a motor with a wider base. I used zero thrust angles. The wing fence shape was "borrowed" from another Sbach design.

This is a hastily chopped together video of me tooling around at the park with an older airframe which needed more authority on the elevator & ailerons.
Sbach 342 92cm depron RC model (4 min 10 sec)

A more recent unedited video of the current setup.
Sbach 342 depron RC model (4 min 46 sec)
Last edited by limmacslim; Aug 22, 2013 at 08:39 PM.
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Apr 11, 2014, 08:34 AM
Retired CAD guy
birdofplay's Avatar
Well I just liked this design a bunch and I also loved the way limmacslim flew it in the
vids provided above.
Most vids don't really "wring out" and new design and show it's true capabilities.

regardless, I asked limmacslim if I could CNC cut this design and then promptly
SCALED IT UP to ~ 50" span.
My neighbor has an ADDICTION X and wanted something about that size
to get comfortable with before getting serious with his Addiction.

Using 2 FULL sheets 9mm Depron , some serious 6mm sq CF for a VERY STIFF Spar
and a Motor Mount borrowed from the "Hammer" , we came up with the plane in the Pic

Final LG , Specs and Equipment will follow soon but it flys well in strong wind
fills the bill for my neighbors Addiction X " trainer" and then some.

I will make this available as a CNC cut Kit with ply horns and CF spar.
Gerry is lobbying me to invest in and offer a Full Kit on this one.
So after we get the LG and optimum Motor and Prop size nailed down
I may offer the total package as an option,


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Apr 11, 2014, 11:49 AM
All can fly...Launch stronger!
ttersu's Avatar
Great new Bob!
Apr 11, 2014, 11:58 AM
Retired CAD guy
birdofplay's Avatar
Thanx ttersu.

In the next hour or so I plan to go out and get some Vids of this new Larger Version.

Apr 11, 2014, 03:19 PM
Registered User
limmacslim's Avatar
Hey Bob, nice work . Looking forward to seeing it fly!

Im also currently building another one for an indoor meeting in a sports hall. Not sure how large the venue is so it will be a smaller version with 3mm depron, maybe 27" span & aiming for lower wing loading than the last one. Im trying to get it to work with a low kv 11g 1811 turnigy motor.

I will try to get some video up if its built & working in time for the meet on monday.
Apr 11, 2014, 03:46 PM
Retired CAD guy
birdofplay's Avatar

We are waiting for the 4mph winds predicted to calm down below 10 mph !

Bu there's a couple more pix while you are waiting for vids.

BTW Based on Gerry's Prototype build, I've revisited the CAD file and added a routed channel for the spare to go in plus cutouts for all servos
as well as aileron cut out holes for alignment.


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Apr 11, 2014, 09:22 PM
Retired CAD guy
birdofplay's Avatar
Went out just b4 sunset and got vid on my Galaxy note
Plus some more om my old Lumix camera
Trouble is I havent used the win vid editor much
So it'll take me awhile to get it all together.

I really liked using the Note pad as it was easy to keep
The plane in the frame.

Apr 12, 2014, 02:03 AM
Registered User
closeflyby's Avatar
Great Job!

It looks like it flies really nice. I think I'm gonna have to build one when I have the time! The sbach is one of my favorites. Do you have any problems with the motor getting too hot? Isn't the 9" prop with 3s a little to much for the blue wonder?
Apr 12, 2014, 08:14 AM
Registered User
limmacslim's Avatar
closeflyby, I have been running my motor with a 9x4.8 for something like 10 months with no issues although the motor is rewound with thicker wire & stays cool at 10a-11a. Its actually the 450mah 25c lipo's that don't like it . An 8x4 prop also works well.

There's probably not a definitive answer because the blue wonders do come in a few variations but im pretty sure I have heard of others running 9" props on a stock motor, I have a 16 magnet WYE version which was bought from here
I also use these gws "clone" props because they are pretty efficient compared to similar props & draw less current.

This is the current state of my "used & abused" motor, the copper still looks like new & in very good condition.
Apr 12, 2014, 08:27 AM
Retired CAD guy
birdofplay's Avatar
Nice looking Wind.
Even , Clean & Tight !

I used to wind my own too.
Another fun and informative part of this hobby.

still working on vid 9 I had to sleep )
Maybe yet today.

Apr 12, 2014, 08:52 AM
Registered User
limmacslim's Avatar
Thanks Bob. All in good time with the vid, sleep in pretty important stuff

I agree, its a very satisfying & often helpful thing to do.
Last night I tried to get a 1811 motor running on 2s with an 8x4 but it did not behave well with the larger props. I moved onto a 11g m2020 motor which is known for having bad stock windings & being very inefficient, It now has a reasonably tight low-kv wind on it & am hoping for better performance. Fingers crossed.
Apr 12, 2014, 10:05 AM
Retired CAD guy
birdofplay's Avatar
Ok here it is !

I just did a quick clip and sound track.
I just used WinLiveVideo maker on WIn7 laptop.
Nothing Hollywood about this one,
except Gerry's Nice paint job.

Sbach50 (3 min 38 sec)


Last edited by birdofplay; Apr 12, 2014 at 10:38 AM.
Apr 12, 2014, 10:48 AM
Registered User
limmacslim's Avatar
Awesome job & Nice flying!

Your larger version looks very light & floaty, wing loading seems excellent, it looks even more forgiving than the smaller version.

Also looks like a lovely day for flying over there .
Apr 12, 2014, 01:38 PM
Retired CAD guy
birdofplay's Avatar
Thanx, but ...
My vid was CUT while yours were continuous and Close in.

We're learning, however :-)

yup yup yup :-)
Spring is coming ! 75 F today but 20+ Mph winds in attendance :-(

YES the weight before some LG additions was only 18 OZ .

I'm thinking that a Beefy LG like the Hammer has and a bit larger motor
shouldn't affect that floatyness too adversely.

Gerry has ordered a $30 motor from Wicked and I have some alternatives to try
before spending another $30 and yet another motor.

Given the span, I am going to try a 3010B-1300kv 400w motor that I already have in house.
Will use a 40A ESC Plush and check the watts with various props B4 venturing out.
Probably Prop it to get far less that 400w and keep the amp draw under 40 ( obviously ) .

I have "MY" fuse assembled and the wings center glued with ailerons cut off.
The spar goes in next. While that dries I'll be tapering the Surfaces .
I really DO NOT see the need for a Build Thread as this is SO straight forward.
And it's for intermediate to Expert fliers anyway. I mean 3D, of course.

I have 4ea CS-239HV MG servos in the drawer.
So even tho they are for Thin Wing use I'm going to slap them in the Sbach anyway.

Gerry and I both "want" to get 2 of these in the air at the same time SOON !

It wasn't too many months ago that I'd though about a fairly calm spring time with a few
new prop in slot, slide on ground, Jets test but then Gerry came along and dragged me
into OUTDOOR 3D .
Now I have the HAMMER and This Sbach and an old Piaget for calm days.

Hmmm I wonder how the Piaget would do SCALED UP ? wheeee :-)


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Apr 12, 2014, 02:20 PM
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corsair214's Avatar


yes and even more windy tomorrow

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