Continuing on my assembly.....
Battery trays:
Spending lots of time building or "Fortifying" battery trays for the separate Receiver and Retract batteries; separate switches for both.
CG Jig:
I found the Plywood CG jig is cut incorrectly from factory (I am alerting MotionRC today of the misaligned jig) - the CG 126mm is correct but the aft semi-hole to rest onto the wing tube needed cut out on my drill press with a hole cutter to allow it to fit for use.
CG:
I am surprised the COG with my dual 6s 100c 8000mAh LiPo mounted all the way forward in the motor box was egregiously nose heavy - this means the model will not require the usual 1lb diver belt weight deployed in the nose!!
Flight Battery tray:
The CG required moving the flight batteries and the battery tray aft, beefing up the lattice work to support the flight batteries, creating a new captive keyhole for the front battery tray tongue, adding a new brace for a secondary battery tray strap and creating a new battery tray thumb screw location for the battery tray.
Receiver and Retract battery trays;
The CG required moving the receiver and retract batteries aft next to the rudder/tailwheel servo......I choose to beef up those surfaces with additional subflooring to support those batteries.
Flight Battery Connectors:
I make a practice of deploying "Anti-Spark" Connectors.....this helps keep connectors clean and hopefully reduces heat build up or resistance of the system
Final Wing Fitment test:
Assembly is nearly completed....CG test, battery relocations, retract testing, surface throw settings, stabilizer set up
Final bits to complete
Next is to CA the exhaust ports and mount the belly tank
Final weight
The model with flight batteries and bits added weighs in at 10986grams/24.22lbs The manual says a completed model is between 21-23lbs
(I have never completed a BH model at or under the manual stated total flying weight)
Components weight:
Right Wing: 1707g
Left Wing: 1679g
Wing Tubes: 298g
Batteries: 1861g
Fuselage: 5443g
eCalc numbers
I use eCalc to help determine prop size and probable power to weight ratios.....according to my weights, batteries, ESC Motor and prop:
Power to weight: 202watts per lb
Wing Loading: 44.01 oz/ft2 = 134.6g/dm2
Flight duration at 72% throttle: 8min
Motor overheat warnings at or near 180degrees possible
Deviations from Assembly Manual:
Fortifying battery trays
Relocating flight battery tray position for CG
Re-cutting CG jig
Estimated hours to completion:
55hrs intermittent
Electronics
DX8 Transmitter
Aura8 Stabilizer
XOAR PJN 22x12 prop
Admiral GP160 180Kv Motor
Phoenix Edge HV 160amp ESC
Amass AS150 7mm Anti-spark connector
HobbyStar 6s 100c 8000mAh LiPo (x2)
LiFe 6.6v 2200mAh Rx Battery
LiPo 7.4v 2200mAh Retract Battery
MPI 6470 power switch (x2)
Hi-Tec 645MG servo (x5)
Hi-Tec 7245mg digital mini (x2 Elevator only)
TwistedGrin
Battery trays:
Spending lots of time building or "Fortifying" battery trays for the separate Receiver and Retract batteries; separate switches for both.
CG Jig:
I found the Plywood CG jig is cut incorrectly from factory (I am alerting MotionRC today of the misaligned jig) - the CG 126mm is correct but the aft semi-hole to rest onto the wing tube needed cut out on my drill press with a hole cutter to allow it to fit for use.
CG:
I am surprised the COG with my dual 6s 100c 8000mAh LiPo mounted all the way forward in the motor box was egregiously nose heavy - this means the model will not require the usual 1lb diver belt weight deployed in the nose!!
Flight Battery tray:
The CG required moving the flight batteries and the battery tray aft, beefing up the lattice work to support the flight batteries, creating a new captive keyhole for the front battery tray tongue, adding a new brace for a secondary battery tray strap and creating a new battery tray thumb screw location for the battery tray.
Receiver and Retract battery trays;
The CG required moving the receiver and retract batteries aft next to the rudder/tailwheel servo......I choose to beef up those surfaces with additional subflooring to support those batteries.
Flight Battery Connectors:
I make a practice of deploying "Anti-Spark" Connectors.....this helps keep connectors clean and hopefully reduces heat build up or resistance of the system
Final Wing Fitment test:
Assembly is nearly completed....CG test, battery relocations, retract testing, surface throw settings, stabilizer set up
Final bits to complete
Next is to CA the exhaust ports and mount the belly tank
Final weight
The model with flight batteries and bits added weighs in at 10986grams/24.22lbs The manual says a completed model is between 21-23lbs
(I have never completed a BH model at or under the manual stated total flying weight)
Components weight:
Right Wing: 1707g
Left Wing: 1679g
Wing Tubes: 298g
Batteries: 1861g
Fuselage: 5443g
eCalc numbers
I use eCalc to help determine prop size and probable power to weight ratios.....according to my weights, batteries, ESC Motor and prop:
Power to weight: 202watts per lb
Wing Loading: 44.01 oz/ft2 = 134.6g/dm2
Flight duration at 72% throttle: 8min
Motor overheat warnings at or near 180degrees possible
Deviations from Assembly Manual:
Fortifying battery trays
Relocating flight battery tray position for CG
Re-cutting CG jig
Estimated hours to completion:
55hrs intermittent
Electronics
DX8 Transmitter
Aura8 Stabilizer
XOAR PJN 22x12 prop
Admiral GP160 180Kv Motor
Phoenix Edge HV 160amp ESC
Amass AS150 7mm Anti-spark connector
HobbyStar 6s 100c 8000mAh LiPo (x2)
LiFe 6.6v 2200mAh Rx Battery
LiPo 7.4v 2200mAh Retract Battery
MPI 6470 power switch (x2)
Hi-Tec 645MG servo (x5)
Hi-Tec 7245mg digital mini (x2 Elevator only)
TwistedGrin
Attached Files
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