Hi,

The wings alone are 4.2Kg for both. If I remove all the installed equipment, I will still have remaining 12.6Kg for the airframe plus UC, trust tube and empty fuel tanks.

I have installed the following equipment:
[TABLE="width: 547"]
[TR]
[TD]Qty
[/TD]
[TD][/TD]
[TD]grams
[/TD]
[/TR]
[TR]
[TD]1
[/TD]
[TD]Wren 160 turbine
[/TD]
[TD="align: right"]1700
[/TD]
[/TR]
[TR]
[TD]8
[/TD]
[TD]8x Savox SC1256TG Servos
[/TD]
[TD="align: right"]419.2
[/TD]
[/TR]
[TR]
[TD]2
[/TD]
[TD]Futaba R7008SB receivers
[/TD]
[TD="align: right"]21.8
[/TD]
[/TR]
[TR]
[TD]1
[/TD]
[TD]Powerbox Cockpit SRS
[/TD]
[TD="align: right"]130
[/TD]
[/TR]
[TR]
[TD]1
[/TD]
[TD]Powerbox Gyro SRS
[/TD]
[TD="align: right"]50
[/TD]
[/TR]
[TR]
[TD]2
[/TD]
[TD]Lipo 2200mah
[/TD]
[TD="align: right"]266
[/TD]
[/TR]
[TR]
[TD]1
[/TD]
[TD]Lipo 33000mah
[/TD]
[TD="align: right"]183
[/TD]
[/TR]
[TR]
[TD]1
[/TD]
[TD]Jetronic Break Valve
[/TD]
[TD="align: right"]32
[/TD]
[/TR]
[TR]
[TD]3
[/TD]
[TD]Jetronic Dual Valve
[/TD]
[TD="align: right"]96
[/TD]
[/TR]
[TR]
[TD]1
[/TD]
[TD]UAT with fuel
[/TD]
[TD="align: right"]200
[/TD]
[/TR]
[TR]
[TD]17.5
[/TD]
[TD]22awg servo wire
[/TD]
[TD="align: right"]262.5
[/TD]
[/TR]
[TR]
[TD][/TD]
[TD]Total equipment weight[/TD]
[TD="align: right"]3360.5
[/TD]
[/TR]
[TR]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD][/TD]
[TD]Airframe, Trust tube, UC, and 3x empty fuel tanks weight
[/TD]
[TD="align: right"]12639.5
[/TD]
[/TR]
[TR]
[TD]2
[/TD]
[TD]Wings including UC but no lights
[/TD]
[TD="align: right"]4200
[/TD]
[/TR]
[TR]
[TD][/TD]
[TD]Fuselage including cockpit no pilot
[/TD]
[TD="align: right"]8439.5
[/TD]
[/TR]
[/TABLE]

You said you had the Viper S I don't think you need a 160 in it and I don't think trust tube rated for a 160. I think it would fly on 22 lb turbine you would save 400grams

Damo

Hi Damo,

I have a Jetcat P80 and a Wren 160. The difference between them is Wren 160 is 40grams heavier.
I ordered a 160 size trust tube from FEJ.
Since the runway is 180meters, I preferred the 160 size for nearly the same weight of the P80.
I still do not know if it came a little heavy from FEJ factory, since if I remove all the equipment it still weighs 12Kg.
The question is if it will be able to fly and land safely that wing loading. The effective runway is 130m since there is fencing on the approach of the runway, I lose around 50m away from fence for the touchdown.
I am calculating a wing loading is around 68.37oz/sq.ft, 213g/sq.dm.
I have an FEJ F16 1/8 scale that weighs 10Kg dry and it takes 75% of the runway to get to a stop.

Regards
Vince