Sorry for my poor english.Sometime I maybe use wrong words or gamma.

I received this kit 3 months ago.Well packing and no damages.

Unpacking the packages.
Nice finishing,My cat like it very much.
FEJ forgot to put a lighting controller and have some missing parts.So,I send an e-mail to them and have to wait for it about 1-2 month.

It came with 4000 cc. tank.FEJ suggested for the stock tank that Kingtech turbine should not be used,because of it has more fuel consumption than other turbines.So,I decided to use Jetcat P140RX.(Actually,I want to use K140G than P140RX.)

After waited for lighting controller and missing parts for 1 month.Took about 3 weeks to finished this job.

It passed maiden flight last sunday.Dry weight is about 18 Kg.

Unfortunately,everythings perfect except P140RX.Its sound does not smooth.This sound is liked a turbo prop engine running with prop.Jetcat is not a top quality engine anymore?

Here are my videos.

https://www.youtube.com/watch?v=xpA4lRcK2Io Second flight

https://www.youtube.com/watch?feature=player_detailpage&v=kDMidYKT62U Lighting system

https://www.youtube.com/watch?feature=player_detailpage&v=VZj58hON_30

Congrats on your maiden flight

looks great! Congrats on maiden.

Congrats on your maiden!

The bottom line is Flyeagle was underselling the kingtech dealers and was caught so now they dont want anyone flying kingtech to try and hurt kingtechs bottom line. So if you want the kingtech get it.

Thank you.
Oh,I forgot to give some informations.Mine uses 140RX with 4000 cc. stock tank that can fly about 8-9 mins per flight with average 70 % of throttle stick.For control throws value to maiden flight,I used values from skymaster viper-L manual
these are Ele=20 mm.,Rud=25mm.,Ail=15mm.,Flap take off= 15 degree and Flap landing = 45 degree.
I think it 's a little fast for me,so l reduced to 80 % of the original throws.My viper can take off by using about 150-200 m. of runway length.
In my opinion,140 engine size is match with this model with no options like smoke system or moving pilot.If you want vertical performance and carry more options,you should try 160 size.

More, I have listened to your videos, I can't hear anything (and i dont think anyone else on here has either) Has anyone with a lot of experience listened to it up close to help you?

I can hear it when i use headphones. On startup and on your final i can hear it.....almost sounds like a turbine heli. Very strange

Low rpm you can really hear it.....when at full throttle i cant hear it.

Actually,this sound occured continully from start to stop the engine,but can hear clearly when the throttle position is from idle-30% . My camcoder cannot record enough details of sound because of lound noise environment that exceed the limit of microphone.
From the maiden flight video ,if you listen carefully at 4.20 mins.I used 50% of throttle and you will hear the sound like a frequency pattern.Ten of people in that day (as you will hear they said in this video) decided that this engine sound like a turboprop running with propeller. And at 5.25 mins.,you can hear this sound again.

I tested it on a bench stand before,but I ignored it.
I checked my Viperjet and confirm that everythings were fastened very well and no vibration.

Oh!If you still can't hear it.Please see this video at 6.20 min.It sounds like Anakin's race ship.
http://www.youtube.com/watch?feature=player_detailpage&v=5dcqnEFIw3A#t=382 Jetcat still believe in their QC,but this club has 4-5 jets that use P140RX and everyone comfirmed this engine have some problems.
Finally, if Jetcat cannot suggest me to repair it by myself.I have to send it back to factory and have to pay a shipping cost THAT it shouldn't happened with me.
I decided to pay more and bought this engine because Jetcat is a Hi-END turbine engine company and believe in their QC.The result is.......

what do you have the CG set at?