Box Fuse Sbach 20"ws or 30"ws PDF and Pics - Page 13 - RC Groups
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Oct 12, 2012, 08:38 AM
Registered User
timatworksg's Avatar
I would add right thrust too. These small micro planes have a fast spinning prop and if you build it light, lotsa prop torque. The HH UMX planes have very obvious down and right thrust angles, so a little right is good. 21" may be a little big for the p51 gear,...unless you can get her to weigh approx the same as the UMX version. Otherwise, 17-18" with a little wider on the wing and elevator chords perhaps? But of your going profile, 21" may just work out well. Keep it light and use glue where needed. Don't When I started building I always overdid it. Then thru time, all those places I overdid, never really needed any...haha!

Best of luck! And report back! On a side note, my Sbach is still around and perfect for a slow sporty flight when 3D isn't in the mood. Tho she can 3D, I just love watching her fly patterns with those destictive colors!!
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Oct 15, 2012, 08:32 PM
Registered User
I did re-size to a 17" half was just too small.I am gonna go on and do a big one too.Just gotta get the electronics.Re sizing was an adventure I did it by accident on this.I found a set of old plans for a balsa Storch; well 39 pages later I got plans to build one as big or bigger than the cover plane on RC Airplane.....Needless to say that one won't be built in the foreseeable future.I did get one the right size this morning and I think I have it figured out now for repeatable success.
Sep 29, 2014, 02:54 PM
Registered User
Hey how are the wings glued together?
on the pics I see a kf profile but the plans just show 2 wings glued together.
and wheres the battery door or where is it placed?

maybe some other things I need to know.

thanks already!
Sep 29, 2014, 04:45 PM
TheOne420's Avatar
Originally Posted by BASTHEBEAR
Hey how are the wings glued together?
on the pics I see a kf profile but the plans just show 2 wings glued together.
and wheres the battery door or where is it placed?

maybe some other things I need to know.

thanks already!
the kf wing is an easy addition most of us here just made the top and bottom piece about 1/4 inch past the spar when measuring from the leading edge. you can then simply notch out the side fuse panels at the thickness of the added foam.
the top fuse nose piece is often used as the battery door so from the canopy to the nose is where the battery should end up.
Sep 29, 2014, 10:34 PM
My hovercraft is full of eels.
Wheeee! So glad to see this thread again. I was just cleaning my garage the other day, trying to make room for more planes because I just don't have enough.

Room... not planes. Well... yes, planes! This plane! I need a new, bigger one. Something that can handle a 3S 1000. Oh yes... we're talking 36" or bigger wing. Woohoo!

I have a lot of foam.

sooo much foam....
Oct 09, 2014, 05:47 PM
Registered User

Why does the 20" version have a double kf profile and the 30" version just a single plate?
And where are the right electronics listed for both planes?
Is there any difference in flight on the both?

Thanks !
Sep 16, 2015, 10:21 AM
Registered User
Sorry for bringing up this old Thread! But I am thinking of building the sbach!
I'd like to use my D2822/14 with 1400kv on a 3S1300 Setup (I got the batteries from my quadcopter, so I'd like to use them!) eCalc tells my something about a 8x4,3 with 684g thrust, and 70km/h pitch.

What I don't know: Does the Sbach fit to my specs? Which size should I build?
Sep 16, 2015, 11:53 AM
TheOne420's Avatar
That should be just fine. I used a 2822 1200kv on the 30" version with unlimited vertical on a 9" prop so you should be right about the same. Your setup will have a little more speed but should be great.
Sep 17, 2015, 01:38 AM
Registered User
Thanks! Whats the weight I should calculate for the whole setup? Just for knowing the Thrust/Weight ratio?

I ordered some NTM Prop Drive 28-26 with 1000kv and could run:

10x5 - 678g Thrust and 53pitch
9x7,5 - 535g Thrust and 75kmh pitch
9x4,5 - 544g thrust and 53kmh pitch (and sic 8min runtime!)

If theres any chance I'd like to use this motor for the sbach, because the Turnigy D2822 suits my Depron Corsair (there is a thread in here somewhere) way better (I think ;D)

What do you recommend?
Last edited by man1ac; Sep 17, 2015 at 01:59 AM.
Mar 08, 2017, 04:54 PM
What goes up . . . Damn trees!
I'm surprised there hasn't been any activity on this thread for the past 18 months as judging from the build photos here it really is a good looking plane, so I thought I'd screw my courage to the sticking place, stick my head over the parapet etc . . . and build one.

I've built and flown a couple of Nutballs and a Drenalyn but thought the time was right to a) build something of a more traditional plane shape and b) get to grips flying a plane with ailerons. I've previously had a Parkzone micro Sukhoi which I managed to percussively deconstruct in a fairly short space of time, but I'm planning on putting in a lot more simulator time before I fly the Sbach.

The build is coming on well and I'll post a few pictures in a day or two, but I have a couple of questions on the electricals if someone is willing to advise.

I'm building a 21" wingspan with KFM4 steps and planning to use a lot of what I already have to hand so will be using 450mAh 2S or 3S batteries and a 12A ESC. I've also got Turnigy C2024-1600 (17g) and C2028-1400 (22g) and Hextronic 1300Kv blue wonder motors to hand. My thoughts were to use the C2024-1600 with the 3S batts and a 7x5 prop. I'm never going to be looking for looking for very high top speed or performing high-g manoeuvres, just something I can fly at moderate speed while I get used to flying with ailerons. Does this setup sound sensible?

I've got three Turnigy 1440A 4.4g servos but my gut feeling is these won't be man enough for the job and I should really wait a few days for some HXT500's to arrive. Agree? (Update - I've just found a handful 6g servos lurking in a box - Look like HXT500 although no name label but smooth enough and feel strong - Ideal!)

More generally, what was the reason for moving the horizontal stab. and which was the preferred position? The 30" plans on post#1 show it in line with the wings and the 21" as slightly above?

I'm really enjoying building the box design and hope my finished result does TheOne420's hard work justice. I'll update progress and post pics in a while.

Mar 18, 2017, 11:45 AM
Registered User
Last post was quite a while ago so not sure if anyone is still looking at this thread. I've got an 1100kv 75g motor, how big wingspan would I need. Thinking of sizing up the 30" plans to 36 or 40"?
Mar 19, 2017, 06:34 AM
What goes up . . . Damn trees!

The Yellow Peril.

Done and ready to take to the air! Could be a while before the maiden though as it's way too windy today and the weather forecast for the week looks pretty grim At least it will give me more practice time on the simulator.

The wing is KFM4 and there's 2 strips of carbon flat running down the fuse for rigidity and one across the horizontal stabiliser. Weight without battery is 130g (4.6 oz) and I'm using the Turnigy C2028-1400 motor and a 7x5 prop. I've not got a test rig set up but with this combo on a 2S battery it feels a bit better than 1:1 thrust to weight ratio. With a 3S it will be wild! The servos are HXT500 and I've got 2S 500mAh and 3S 450mAh batteries to play with.

I was initially going to mount the battery below the wing-line but then found it needed to be further back than I expected to get the balance and the space was already taken by the aileron servo so I had to increase the height of the nose a bit to fit. The black sharpie running down the nose hides the join nicely The area around the motor mount is a bit scrappy but I'll maiden it first in case I need to alter the motor angle.
Last edited by AndyGadget; Mar 19, 2017 at 09:08 AM.
Mar 19, 2017, 11:28 AM
My hovercraft is full of eels.
4.6 oz without the pack with on the box fuse is awesome. 21" is going to be super responsive and fast. You are going to love that!
Mar 19, 2017, 11:59 AM
Reap the wild wind
headlessagain's Avatar
Certainly have some low rates and lots of expo available. The smaller the model the twitchier they tend to be.
Mar 19, 2017, 04:29 PM
What goes up . . . Damn trees!
21" is going to be super responsive and fast.

Certainly have some low rates and lots of expo available.
Given those comments, I DEFINITELY need more simulator time before I take it for a test flight

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