Saturday, 17 November 2012

Electric Schwing Development

Schwing electric is sleek but not made for just E soaring! 

Milling on the Schwing electric is about to start but I just couldn’t help sharing the development that’s gone into this project so far.
The electric fuse will be fully interchangeable with the glider version which meant quite a design challenge to keep within the wing root spacing and still have a decent power set up.
In the end we managed up to 6s capability using 28mm diameter motors. So this will cover 500w with a 28mm outrunner on 3s or up to around 2.5kw on 6s!

Design specification was for up to 6s! Here we configure 3 x 3s packs to check the spacings. 
Following on from power train tests we have been doing for F3B electric we’ve been looking into the motors too using a geared 28mm diameter in runner to give high efficiency up to around 1.3kw and lower. They are 64mm long and a bit bigger than most geared motors you can find. These will run with more power and cooler. It’s just simple physics, the bigger the motor the bigger the magnets and the bigger the stators and more efficiently it will run at the same power level. One of these with the right KV, gearbox and prop will give bursts well over 2kw on 6s, which should be quite an outrageous hotliner with the sleek, clean Schwing airframe!  
Cone design with integral battery tray 

Fuse has air exits moulded in  

Skinny electric gliders can now run efficiently on 800w+ on 3s ,4s, 5s and 6s using 16-17’’ props using 28mm diameter motors. Of course you can get to these power levels with shorter motors but you’ll find the power out is much less and you’ll find they get hot very quickly!      

Bigger makes all the difference- stock Hacker geared B40L, 58mm long motor and our test with a 64mm long can using a Reisenauer gear box

Prototypes to be made at the Sloperacer workshops and just can't wait to fly one of these! 


  1. Why not just make it suitable for 36mm inrunners then it will be able to take a wider range of motors. What's the point of tapering the nose down to 28mm?

    1. The Schwing is very slim!
      To make the E Schwing interchangeable with the Schwing glider wings the fuse joiner width has to remain the same which is 28mm, otherwise it would mean providing a new joiner with every E fuse. This really restricts the size of the motor and a 36mm diameter 'can' really wouldn't work. So our solution was to design around 28mm diameter motors and develope more powerful ones of this size. The Schwing and many electric gliders will benefit.