Scheibe SF-34
2-seat trainer

Photo by Chris Ruf

Photo by Steven Kempf

Photo by Steven Kempf

Photo by Steven Kempf

Photo by Chris Ruf

Photo by Jeff DiNucci

Photo by Jeff DiNucci

Photo by Jeff DiNucci

Photo by Jeff DiNucci


SF 34 Flight Manual

SF 34 Instructions for Continued Airworthiness

SF 34 Repair Instructions

SF-34 Datasheet from the British Gliding Assoc


General Details, for reference only see manual
Manufacturer: Scheibe
Plane Name:


Country Of Origin: Germany
Designer: Egon Scheibe
No. of Seats 2
No. Built 40
L/DMax: 35 95 kph / 51 kt / 59 mph
MinSink: 0.70 m/s / 2.3 fps / 1.36 kt


Specifications for reference only see manual:
Span Area Empty Weight Payload Gross Weight Wing Load Water Ballast
m ft sq.m sq.ft kg lb. kg lb. kg lb. kg
kg lb.
15.8 51.9 14.8 159.3 330 727 210 463 540 1190 36.49 7.47 0 0
Aspect ratio: 17
Airfoil: Wortmann FX-61-184
Structure: GFRP
Engine: N/A

The SF-34, which first flew in 1978, was Scheibe's first two-place production glass fiber design. ATC

S3 1 spacers3  2spacers3 3

In 2019 we upgraded the panel. Below is the manual for the LX Nav S3 vario installed in the SF-34 front panel.  The S3 is an amazing little box.  It is a standalone, electronic, TE compensated audio vario with altitude and speed to fly built in that uses very little power. 
Mark pre-programmed almost all of the functions (including polar) and units, so you have very little to do when you want to use it.  There is a single knob (push/turn) on the lower left of the unit that controls everything.  When you are preparing to fly, install the battery and turn on the master switch.  Push the S3 knob for a second, the unit will come on - it takes about 20 seconds to boot up and self-calibrate. 

The first thing you will see when it's ready is the field elevation dialogue box (calibrates the altimeter function) - turn the knob until the barometer setting is highlighted, push the knob for a moment to select, then set to the barometer setting shown in the glider's altimeter after you set field elevation (890', usually around 30.40"hg) - this way the vario will be the same as the altimeter.  Once set, push the knob for a moment, it will go to the main menu, turn the knob clockwise until you highlight exit, push again, and the main vario screen will show, and you're ready to fly.  Turn the knob clockwise to increase audio volume (it turns on at zero). 

The Linked manual explains everything.  Note that this is a vario only - no GPS or GPS interface, but it is very sensitive and has speed-to-fly (the instructions explain how set the MacCready) - also attached is a discussion on MacCready theory (an easy read, on a complex subject) for those of you not familiar with the subject - if you want to fly the SF-34 cross-country you need to read up on this to optimize your flying (actually, even when puttering around the local area),  Enjoy!

LXNav_S3vario_manual.pdf & discussion on MacCready theory
Link to LX Nav website with latest version of manual

S3 screen overview

SES homepage

Last modified 23-Aug-2020 by CR