ORIGINAL: DrMotor

Hello Mike: They are totally different planes. The SPUTNIK is much larger than the ZOOM 4D. The SPUTNIK was designed specifically for F3A schedules.

<span style="font-size: medium">ZOOM:
</span>http://www.aircraft-world.com/prod_datasheets/zoom.htm
" The Zoom-Zoom 4D was designed by David Kyjovsky, Czech Republic Indoor Aerobatic Champion...".
It is a pure 3D plane
Wing Span 820 mm
Length 855 mm
All-Up Weight 285g- 345g
Also: http://aerialconcepts.info/index.php...roducts_id=311


<span style="font-size: medium">SPUTNIK:
</span>http://www.topmodel.fr/en/product-de...110m-epp-magma
The SPUTNIK, drawn by Nicolas PIETU is a mini plane of 1,10m (43") wingspan entirely designed in EPP for F3A aerobatics
Wing Span 1100 mm
Length 1200 mm
All-Up Weight 800 -900g

http://www.rcgroups.com/forums/showthread.php?t=1130509
nicolas pietu: "The SPUTNIK is a mini plane of 1,10m (43" ) wingspan entirely designed in EPP for F3A aerobatics.
The geometry of the SPUTNIK and the airfoil of the wing, inter alia, were studied to approach to the maximum of the glide path and the piloting feelings of a 2 meters F3A plane - and this, even in a pretty strong wind! "

From: http://www.rcgroups.com/forums/showthread.php?t=1130509
SUMMARY COMMENTS:
wildpalms: "Having got some serious flying time in with mine now I really do like it. " ... Everyone who sees it is amazed that a foamy can fly this precise and so much like a bigger model.
" ... As an aerobatic practice plane rather than 3D I think you'd be hard pushed to beat it."
" ... Found it one of the best knife edging and rolling planes I have flown.
I have well over a 100 flights on mine now. " ... By far the best plane I have ever flown as an aerobatic trainer. "
"Flies like a much bigger plane. Lovely plane to fly in Knife-edge, my favourite being big KE vertical eights.
Makes a great pattern style aerobatic trainer which is why I have mine. "
" ... I've got the Nicolas Pietu (bit like a French Steve Mallinder) Sputnik and the most awesome EPP model I've ever flown. Rock solid and amazingly precise. Uses a Hacker A30-16M on 4s so not in same class as the RCFactory stuff .... "


Pic of the ZOOM 4D -so you can see the major difference between the two: