I am nearing the home stretch on mine and beginning to plan for the maiden…
I am currently at 11.4 kg total weight, ready to fly. This surprised me because my motor and batteries are quite heavy, as is my ESC at over 400g with the added capacitors and cables. The estimated weight per Hangar9 is 12-14.5 kg, so to finish 600g underweight is a nice surprise. I was able to save quite a lot of weight by using PMT 200mm inflatable Bushwheels and using a 110mm fiberglass spinner (both of which look better as well imho)
For those interested, my setup is as follows:
Dualsky GA6000.8 (180kv)
Jeti SPIN 200 Opto
Jeti AddCAP 1640 μF
Jeti MUI 200 (for motor and akku telemetry)
Jeti CB200 w. (2) Rsat2 and magnetic switch
Jeti MGPS
Bavarian Demon Cortex Pro
(2) Jeti 2S LiIo 5200mah packs for receiver and servos
Jeti SP06 with 3S 950mah for lighting control
(7) KST KST DS725MG servos for control surfaces
(1) Hitec D485HW servo for Schleppkupplung
(1) Jeti Spannungsregler Single BEC for the SPIN 200
Some current numbers (from eCalc):
Motor @ Maximum
Current: 162.00 A
Voltage: 40.83 V
Revolutions*: 6703 rpm
electric Power: 6615.3 W
Efficiency: 91.1 %
Power-Weight: 631 W/kg
Static Thrust: 21251 g
Thrust-Weight: 1.86: 1
In reality, I have seen 174A and 44 volts in garden testing, which is still below the limits of the motor, controller, and batteries. These numbers will of course be lower in the air than stationary on the ground. I suspect that the Mejzlik 26x10TH propeller spins a little faster than the 6700 estimated due to its thin profile, and that the akkus are rated quite conservatively in both capacity and C Rating. (I am using two 6S Hacker Power-X 7500 to make 12S)
Nest step: Schwerpunkt. Even though I am underweight, the plane is nose heavy. I will need to make a tray for my 10.400mah flight batteries and mount them behind the cabin. I will avoid at all costs adding lead.
My new Pilot starts his “contract” in March… everything should be well sorted by that time. Fingers crossed.
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