Lets compare this jet to one of the best! The $5000!!! BVM Electra http://www.bvmjets.com/Pages/kits/Electra_ARF.htm
There's only a diffrence of 29cm there in the WS. And thats what really matters.
Here's the BIGGY!
I think if the Viper has any kind of half decent setup, it will fly just fine
Yes! the Electra has a 110mm fan, but then again, the Viper isnt going to be carrying the extra 6lbs, now is it