can anyone that has built the Karken as to how many channels would be needed? I just checked the hobby shop here and I could get a 4 channel or a DX5 or DX6. The only thing I have a problem with the 4 channel is that it will not come with mixing or rec. both the DX5 and the DX6 are out of my budget at this time. so my question is this without the receiver or mixing can the 4 channel be still used?
I haven't built a Kraken but I believe it can be flown with three channels if you use an on board V-tail/elevon mixer and a y connector for the twin motors.
If this is your first plane I suggest starting with the FT Flyer rather than the Kraken. Flying wings can be more challenging to get to fly and the Kraken is really big so more challenging.
If budget is tight for the controller either:
HobbyKing
HK-T6A-M2/ Flysky CT6B - make sure to get the
programming cable
or
Turnigy/FlySky i6
The HKT6A/CT6B requires a PC to program it and you can do quite a lot with it but you will be happier with the i6.
The HobbyKing and Turnigy versions are usually priced a bit better but you can buy the FlySky versions elsewhere.
Another super low budget alternative is to get a used DSMX DX5e. You can find these for around $40, sometimes with a receiver. I would avoid the older DSM2 ones personally but they can work. Not as flexible as either of the two above but you can fly Spektrum DSMX BNF models with it which is a plus depending where you live. You can buy replacement Orange or Lemon DSMX receivers for not too much.
Generic 4ch type TXs will get you going if that is all that is available but unless this plane is a one off for you, you will want something better almost immediately. Having servo reverse switches is convenient. Some may even have a vtail/elevon mix setting avoiding the need for an on board mixer.
Just be aware that different brand TXs do not typically work other brand RXs. HobbyKing is very confusing in this respect because it re-brands several incompatible makes even within it's own sub-brands.