Slipstream 50cc SBach 342

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Background Trimming Flight statistics
Specifications Modifications Flight experiences Links

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Background

As the 2012 flying season and my aerobatic practice progressed I began to think of a scale aerobatic airplane for 2013. I figured I'd buy a 30cc sized Almost Ready to Fly airframe and equip it with the components that fit best. In October, however, a complete 50cc SBach came up for sale on an online forum at an excellent price. The seller was someone I knew - we talked it over, and I bought the plane. Hello, giant scale!

There was some cleaning up to do changes I wanted to make, so it was overhaul time. I realized after I got the plane into my workshop that the landing gear was badly twisted. The seller offered to fix it. He did a great job and when he brought it back to me I got to work. The to-do list was extensive (see the Modifications section below)... but I'm done and the plane is flying beautifully.

After not flying the plane for more than a year I came to the conclusion that I just did not have the time to commit to aerobatic practice. Rather than let it gather dust, I sold it to a fellow member of my flying club.

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Trimming

This is a work in progress guided by Peter Goldsmith's excellent article. See the trimming page for details.

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Flight statistics

Flight time: 3h 07m
Takeoffs: 35
Landings: 33 (two minor crashes)

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Specifications

Wingspan: 2210 mm (87")
Length: 2006 mm (79")
Weight: 9.0 kg (19.8 lbs)
Powerplant: Desert Aircraft DA-50R 50cc two-stroke gas
Receiver: Futaba R6008HS
Receiver battery: 6.6V 2500 mAH A123
Ignition battery: 6.6V 2200 mAH A123, regulated to 5.2V
Ignition kill: Smart-Fly fibre optic
Aileron servos: Savox SC0251MG x 2
Elevator servos: Hitec HS-5945MG x 2
Throttle servo: Hitec HS-625MG
Rudder servo: Hitec HS-5945MG

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Modifications

Gear replacement

Cockpit

Covering

Electronics

Firewall

Fuel system

Wheel pants restoration

Landing gear

Gear mount repair

Setup

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Flight experiences

2014/05/21 Working with the CG has resulted in much better behaviour. Was much too nose heavy before; landings are easier now.

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Overhaul photos

All photos

Airframe manual1

Powerplant manual

1The Slipstream 50cc manual is lacking in detail and poorly written. It does list the recommended control throws and CG but in my experience the specified CG - 150 mm from the leading edge of the wing - is much too far forward. The copy I have was scanned by a friend who owns the same plane; repeated requests to Slipstream for a copy of the manual went unanswered.

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