Flight Model Sbach 342 (ARF balsa) - RC Groups
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Mar 25, 2012, 03:26 PM
Crash proof pilot
FlyDave's Avatar
Build Log

Flight Model Sbach 342 (ARF balsa)

Hi all !

I start this thread to show the building of my freshly received Sbach 342 made by Flight Model (www.flight-model.com)

This is a picture of the finished product, found on the producer website.
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Description: The finished product (not mine)

Some technical info's :

Name: Sbach 342 55" EP
Numbers: M082
Wing span: 55"/1400mm
Wing area: 38.14sq.dm
Length: 53.4"/1357mm

You can find this model on Hobbyking or others online shops.
I bought mine from a local Swiss supplier.

I'm waiting the electronic parts, so don't expect a finished build so fast
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Mar 25, 2012, 03:45 PM
Crash proof pilot
FlyDave's Avatar
Ok, starting !

I begin with the landing gear... the easiest part

The landing gear is made in black painted alluminium, fixed with 3 allen screws on the airframe.

First picture show the parts contained on the bag :

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The wheel support (sorry for my english translation) is fixed on the LG only partially, first thing to do is to mount the wheel. I've added two washers, because i don't like a direct contact between the wheel and the support axle, the picture show what i mean :

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Try to fix the wheel stop collar with the screw in the up direction, you may need to adjust it later.
The wheel should spin freely, but without much "play".

Next step... put the wheel cover.

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To tighten the nut, simply put a small screwdriver on the small hole, on one side of the wheel axle.
It is not necessary to align perfectly the cover now, you can do it later

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Do the same thing on the other side, and... tadaa.. a completed landing gear

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p.s. : btw, sorry for my english.. i try to correct my grammar mistakes when i find them eheh.
Last edited by FlyDave; Mar 25, 2012 at 04:04 PM.
Mar 25, 2012, 04:01 PM
Crash proof pilot
FlyDave's Avatar
Next step, vertical stab.

First i put the stab on is slot, then i mark the position with low tack adesive.
Another trick is to put the adesive on your jeans a few times, if you don't do that, the risk is that you damage the oracover when you remove it.

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Do this on each side, then remove the stab and with a small blade cut and remove the oracover, best if a little under the marked position (2mm is enough).

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Attach this part with wood glue, it is perfect for balsa vs balsa.

A note : the part show a little gap when mounted, you can fix it with a sander, or you can leave it as it is, it's up to you.
The important thing is to check that when glued, the vertical stab should be aligned with the airframe, as shown in the last picture.

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Mar 25, 2012, 04:39 PM
Crash proof pilot
FlyDave's Avatar
Next thing i can do while waiting for the remaining parts, is to glue the ailerons on the wing.

First i glue the cyano hinges on the wing. Using thin Zap with the extender tips allow an easy application of the glue exactly on the center slot of the hinge.

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Once done that, you put the aileron, checking to have the same gap (the smallest you can) on the whole lenght, and also be sure that the root of the aileron don't touch the wing, leave enough gap to move freely.

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An easy way to find the hinges position, and the point where to put the glue, is to bend the aileron and put a lamp behind, you can clearly see the hole as in this picture :

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After the cyano has dried, move the aileron and check for free movement, then if you see a little white fog on the oracover, remove it with a rag and alcohol.
Mar 25, 2012, 05:04 PM
Crash proof pilot
FlyDave's Avatar


Glueing the aileron and elevator horns.

Be careful, on the bag there is 2 sizes.
The long horn goes on the ailerons, the smaller on the elevators.

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The carbon fiber horns surface is shiny, you must sanding it a little with sandpaper, so the glue grab better.

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The little G10 (fiberglass) plates contained in the kit is glued to the horn with thin cyano.
Caution !! this is my first mistake !

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Description: first mistake !!

I've only late discovered, that on the kit there is only 4 plates, two for the rudder horn, and two for the ELEVATOR horns !!
It was too late when i discovered, but it is not a problem, i've used a 0.30mm fiberglass sheet and cutted two more myself (see later).

Ok, the horn with the glued plate is now glued with 5-min epoxy to the ailerons.
Check that the glue cover the sides of the hole, and the horn, then push it inside.
Remove the excess resin with rag and alcohol before it catalyze.

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Mar 25, 2012, 05:14 PM
Crash proof pilot
FlyDave's Avatar

Elevator horn

On the elevator now.

As said before, i've made a mistake using the plate that goes on the elevator horn, on the aileron.
So... the first thing is to build another.

I've many fiberglass sheets on my drawers, so i've taken the smallest (0.30mm thick) and cutted two more plates with an xacto knife.

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Do the same thing as the aileron horn. Sand the surface, glue the plate with cyano.
Find the horn hole on the elevator using a lamp behind the oracover (sorry for the bad quality picture)

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Cut away the oracover, only on the bottom side of the elevator!
At this point, use 5-min epoxy and glue the horn on the hole.

This is the most important place of your aircraft ! Check that you really put the glue on the hole sides, on the horn, and that the whole assembly is well placed.
This part should never break! If you lose the aileron or the rudder you can still save your airplane, if you lose the elevator you lose the airplane and you can injury someone. Concentrate on the elevator assembly, really.

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Mar 25, 2012, 05:16 PM
Crash proof pilot
FlyDave's Avatar
That's enough for today.

I've checked the tracking nr. of my order, engine and esc should arrive tomorrow, but the servo's aren't shipped until now... have to wait.
Mar 30, 2012, 12:38 AM
Look Up!
gewiens's Avatar
Your gonna love this plane. I must have 30 flights on my HK one and it just handles awesome.
Mar 30, 2012, 02:48 AM
Crash proof pilot
FlyDave's Avatar
Originally Posted by gewiens
Your gonna love this plane. I must have 30 flights on my HK one and it just handles awesome.
I'm sure gewiens, it look very well built

Engine, ESC, batteries and propeller arrived today ! will continue soon this build-log.
Apr 01, 2012, 03:33 AM
Registered User
flying my sbach in the next 2 hours, cannot wait! FlyDave - I am sure you will know this but please remember to reinforce the elevator- I have after reading all the posts on this model..
Apr 01, 2012, 09:56 PM
Registered User
how did it go, im interested in this model
Apr 03, 2012, 09:45 AM
Crash proof pilot
FlyDave's Avatar

Motor mount

Just a little update...

Someone on HK review, said that the G60 motor just "fit perfectly" on this airplane.
Well.. this is totally WRONG

The motor is too big to be used with the original mounts, as you see in the first picture, i have mounted the engine with the aluminium cross, and the propeller shaft is pushed all the way back.
It stick out tooo much to be used with a spinner with backplate.

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So i tried to gain some mm (inches) from the front. Removing the "cross" i gained 2mm, and the motor was mounted directly on the firewall using the center holes already existing, you just need to enlarge the holes a bit to fit the 4mm screw.

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I have used 4x16mm screws + spring washer + flat washer.
This is a picture of the backside, sorry for the bad quality.

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Another 2mm was gained, shortening the motor shaft with a dremel.
Now it's a little better, but still not enough for a nice "zero gap" fitting with the spinner.

Sorry but i was so angry that i haven't taked other pictures after the modifications.

A better mod is to shortening the nose as gewiens has done, look at his thread.
But actually i want to fly this thing soon, before the rain of May, so i will fly it as it is, and will think about better mods in the future.

Tomorrow i should receive the servo's so i can continue.
Apr 03, 2012, 09:50 AM
Crash proof pilot
FlyDave's Avatar
Sorry but something does'nt work with my images... they don't scale down automatically....
Apr 03, 2012, 09:53 AM
Look Up!
gewiens's Avatar
My plane is holding up perfect with my mod. It's stronger than stock with all the extra bracing I put in. Not sure why the made motor box so long.
Apr 05, 2012, 12:27 PM
Crash proof pilot
FlyDave's Avatar

Today i received my servo's.

I don't know who is the i*iot who has suggested those item's on HK, but they are totally wrong !!

The servo's are too thick and they don't fit the elevator mounting holes, nor the aileron's holes that are 25mm thick.
Another bunch of money gone to the wc....

I can't find servo's that have the correct size and that fit the thickness, so i think i must modify the holes making some adapters and using smaller servo's.

Now i remember also why i hate those damn ARF's... you have always something to modify to make it fly..

I'm sorry but i can't update this thread until i find a economical solution, i have already spent too much for this thing.

Another lesson learned : NEVER thrust your vendor (especially chinese ones..)

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