Tengarang's Avenue concerning Lord Emperor Teng's Weekly Field and Hangar Maintenance Activity

[tengarang]

I've run some calculations. and determined fully booked 1000mah 4s lipo has an energy density of 16.8 Watt-hours. This should be more than enough to fully operate two 4238 750KV loaded by a 10.6x7.8x3 props. An equivalent circuit consisting of 30 super caps in a network of 500 Farads each at 2.7V will have an energy density of 15.2 Watt-hours. Which is fairly close to a 4s 1000mah pack for emergency purpose in the event of any main supply failure.....

[tengarang]

That sounds... involved. What's your target weight and noise for this apparatus?

As far as this part of the circuit is concerned, there will not be any noise (as there is no AC coupling) as this just DC power circuit powered by a battery driving a few relays charing a cap for a course function. The majority of the noise will be coming from the ESC and REceiver which is standard but ill be adding some Ferrite rings to the lead of the ESC close to the receiver to help cancel out the noise there.

If the input/signal to this circuit was a function then some filtering would have to be considered however this is more of a backup circuit "Spare very lightweight battery" .

There won't be much weight penalty but could eat up some real estate, as the power relays are 1.6oz each and there are two of them and the capacitors are less than 1/2 ounce. The significant weight would be the 2200mah 2s pack and the external Ubec's which are apart of my standard setup anyway for all of my planes that have sufficient real estate. Id say the wiring of the circuit will be some significance in terms of weight added but nothing I implement will be affecting the all up weight by too much. I'd be very surprised if more than 10 oz of weight is needed after all is accounted for.

[Alpha]

That sounds... involved. What's your target weight and noise for this apparatus?

[tengarang]

Since the Black Horse Heinkel He-111 1750mm (68.9") Wingspan model will be my first balsa model, I want to make absolutely sure there is plenty of security features in the event of any possibility of battery failure to the ESC and motor load. I will be building a supercapacitor network circuit to charge and if needed in emergency cases, discharge the high capacitance capacitor network in series by utilizing a couple of external components. The key here is to pick optimized resistance values for the charging and discharging circuitry which will be toggled by a high power automotive relay rated at 100Amps with a 12V coil voltage. It's unfortunate that there aren't any relays that accept 5V coil drive, which means I'll need to put in a 5V to 12V DC to DC step-up converter to mitigate this issue. The 5V input will be driven by the hobbyking Dr. Mad thrust UBEC with 2A output load at 5V, I will be sourcing this module with a 2s 2200mah lipo for driving the ubec driver as well as powering the receiver via the ubec itself. I chose the 2200mah 2s pack because of the high torque servos I plan on using for the ailerons and the high accuracy digital elevator servo, as well as the B-17 1875mm, retract setup. and will utilize a 4800uF cap or this one will work (bind port) to decouple the output SBEC 5V to the RX in conjunction with the Dr. Mad thrust regulated 5V out as well, in case any set of BEC's fail there are sure to be more that are going to be active to ensure a brownout will not occur.

Note: there will be two relays and two Dr. Mad thrust UBEC's which will be sourced by the single 2s 2200mah pack, the relays will need to be individually switched for the supercapacitor circuit to proper charge and discharge as I do not want the battery connected during the discharge phase, and also during normal non emergency operation, I want the capacitor to be an open circuit condition after it is fully charged at 16.2V.

Note: in place of the Dr. Mad thrust UBEC module a DR. Mad thrust On-off switch may also be incorporated in place as a substitute but this also means an external BEC such as the Castle Creations BEC 10A will be used as the main BEC module in conjunction with the integrated BECs of the ESC's

The output of the 5V driver from the Dr. mad thrust module will be the input voltage of the 5V to 12V DC to DC step-up converter which will drive an automotive relay mentioned above. I will set the driving circuit to the AUX2 for the main supply relay, and AUX3 will control the supercapacitor relay. Therefore a Lemon 10 Channel RX with Satellite will be incorporated for this operation, with an external eagle tree stabilizer.

For starters, I plan on using a 0.1 Ohm 1% tolerance resistor and a series (Capacitance is the same and voltage gets added, just like a battery) network of six 2.7V 1Farad capacitors to achieve the desired RC time constant in order to quickly charge the capacitor in about ~3.3 seconds before the flight begins. After the capacitor is done the charging, the current across the R1. With a charging characteristic of Seven, RC time constants will essentially have zero voltage drop across it which will terminate its way across R2 into the active load ESC and Brushless motor loads.

Now for the discharging part of the circuit:

If should the discharge circuit ever be needed, in case if a battery happens to be bad or if the runway is too crowded or if its too windy (and therefore multiple attempts to land is needed requiring emergency energy); an act of God determines that the battery is gonna quit and there's nothing left, beyond Low voltage cut off for the ESC's to suck on, then we will simply hit the AUX2 switch to open the battery relay, and immediately close the AUX3 switch to close the capacitor relay which by now is fully charged, via the Dr. Mad thrust unit modules to and energize the relay coil by driving 12V to it via the DC to DC step-up converter. The supercapacitor initially is at 16.2V terminated by R2 (50ohms this value will be calibrated upon experimentation) with a wide tolerance resistor which was chosen to achieve an RC time constant to reach a ~3minute discharge (theoretical at 50Ohms) characteristic. But this being an active load with variable throttle should keep enough to buy enough time to bring the aircraft down safely should a battery network give up.

I will create a debug board and simulate which R1 and R2 values will really be feasible. Because the active load is going to be variable with throttle input, it might be noteworthy to increase the value of R2 to 70ohms (or more) to reach a higher RC time constant and discharge time, but I will stick with these theoretical values to start with to see what might happen until I get a debug session going.

[tengarang]

[tengarang]

Rancho San Antonio 05/31/2019 Modified FMS XF6F-6 Hellcat 1100mm

Blog Post Entry#7,

Serial Number: Aircraft#8 of the Tengarang Fleet
Type: Tail Dragger
Application: Military/Fighter
Designation/Identifier: FMS XF6F-6 Hellcat 1100mm
Nationality: USA
Motor: Eflite BL15 880KV
Propeller: FMS 10.5x8x4
Power Source: 4s 2200mah
Radio/Modulation: DX9/DSMX

[tengarang]

Float Plane Rescue Aparatus USS Pier Pressure Titanic II

[tengarang]

Where is this field?

Rancho San Antonio Wild Life Refuge Los Altos Hills California

[Marco Polo]

Where is this field?

[tengarang]

Took the Maule Up today for some FPV action

as i chased a Eflite P-39 and Cherokee around, modification details in my blog below

[tengarang]

HE111 Scheme for the MotionRC Black Horse

[tengarang]

Stewies new look

sporting the Dynam FW-190 spinner and parkzone 10.6 x 7.8 x 3 powered by 1000KV power 25, from a apc 11x8x2 on 4s 2200mah.

with the 3 blade and heavier loading prop i will be running her on 3s

the prop loading factor difference is 2891.413643; a significant boost.

[tengarang]

I have started the accumulation and testing of parts for the soon to come HE-111 twin-engine German Bomber from the second world war.

The Dynam Hurricane Spinner (65mm diameter) with the Dynam standard prop 13x7x3 will be employed to load the NTM 4238 750KV outrunner. Two 3s (12.6V no load // 11.1V under load) in parallel will be powering the twin bomber

Dynam Hurricane Spinner

https://ebay.to/2HpbUjP

Dynam 3Blade 13x7x3 prop

https://amzn.to/2YzpMxM

NTM prop drive 4238 (42mm diameter) x (38mm Can Length)
https://hobbyking.com/en_us/propdriv...ner-motor.html

Dynam FW-190 5mm shaft to 8mm (M8) pressure fit prop adapter https://rover.ebay.com/rover/1/711-5...UAAOSwHMJYGkTl

Lemon 7channel RX with Satellite https://amzn.to/2HtwPSO

According to various sources on https://www.hobbysquawk.com/
the 13x7x3 inch prop will be big enough to clear the ground on take off as long as the tail does not go above the horizontal horizon.

If somehow there is an unforeseen mechanical issue with the 13x7x3 prop which has a prop loading factor of 21749.19038

We can also retrofit the HE-111 with a smaller parkzone prop 10.6 x 7.8 x 3 which has a prop loading factor of 13137.93765

The difference in prop loading facto is a whopping 8611.25273
which means if the smaller prop is used then a 4s 4000mah pack will be employed for flight operations.

[tengarang]

A vessel is a ship or a large boat ;)and I didn't see any seaplanes in that list LOL

fun fact watch video

[tengarang]

https://www.facebook.com/groups/moti...0843884397198/

Before I start another post about the HE-111 i want to say if you plan on using a motor with M6 or 6mm Shaft and you are not planning on doing any custom CNC machining to elongate the prop adapter for the 6mm threaded shaft such that the FMS STUKA Spinner (65mm) https://amzn.to/2LSEEG8 and 3-piece prop https://amzn.to/2W5ZFB2 could be used then my suggestion is to go ahead and go with the stock spinner that comes with the ARF kit which is what I am likely to do since I plan on using the Eflite BL15 850KV motors (https://www.motionrc.com/products/e-...utrunner-850kv) with the standard shaft size. which is pretty much equivalent in dimension to the recommended motor Admiral GP2 3520-950kV Brushless Motor (https://www.motionrc.com/products/ad...rushless-motor)


After learning about the open diameter of the cowling is slightly larger than 75mm, I revisited this topic again to come up with an even better solution to help achieve the scale look as much as possible. Reference the .pdf manual below.

https://cdn.shopify.com/s/files/1/10...111_Manual.pdf

When using the Dynam hurricane Spinner which is measured to be 65mm. The cowling opening itself is a bit larger than 75mm, which means there will be a ( ~10mm = 0.4inch) gap between the spinner and the cowl opening. In my opinion, this would look a lot better than the aforementioned KI-61 FMS spinner because it's only either a 50mm or 55mm maximum diameter which in turn will leave a gap that is bigger than I would have liked. Hence taking another look at alternatives with regards to the spinner backplate diameter. This also means the scale look will also call for a fitting prop which brings me to the conclusion of using the 13x7x3 Dynam one-piece prop and the Dynam hurricane spinner set. The center hole for this mechanicals requires an M8 or 8mm diameter opening which means we will then need to pair these components with a motor that will employ an 8mm or M8 threaded shaft. I have seen pictures from a fellow hobbysquak member shows his Graupner HE-111 which I have come to learn is the predecessor model of the black horse release shos a 11x7x3 MAX prop. Go to post #3511.

https://www.hobbysquawk.com/forum/rc...900#post194900

As you can see from the photo with the 11-inch prop, there is still a bit of clearance between the prop tip and the fuse itself.
I have a few motor combinations I found online below to drive the 13x7x3 dynam prop, depending on your budget and or component availability inside your hangar/manufacturing plant.


Dynam Hurricane Spinner

https://ebay.to/2HpbUjP

Dynam 3Blade 13x7x3 prop

https://amzn.to/2YzpMxM

3s and 4s will require at least two 4000mah 3s or two 3300mah 4s packs. Required ESC will be 80A
FMS 4258 650KV

https://amzn.to/2JMb9TK

3s and 4s will require at least two 4000mah 3s or two 3300mah 4s packs. Required ESC will be 80A
Freewing 4250-580kV

https://www.motionrc.com/products/fr...utrunner-motor

3s and 4s will require at least two 4000mah 3s or two 3300mah 4s packs. Required ESC will be 70A
Turnigy Aerodrive SK3 - 4240-620KV Brushless Outrunner Motor

https://hobbyking.com/en_us/turnigy-...ner-motor.html

3s and 4s and 5s will require at least two 4000mah 3s or two 3300mah 4s packs or two 5s 1800mah to 2800mah packs Required ESC will be 80A
PROPDRIVE v2 4258 500KV Brushless Outrunner Motor

https://hobbyking.com/en_us/propdriv...countrycode=US

3s and 4s and 5s will require at least two 4000mah 3s or two 3300mah 4s packs or two 5s 1800mah to 2800mah packs Required ESC will be 80A
FMS 4258 550KV Brushless
https://www.motionrc.com/products/fm...rushless-motor

[tengarang]

ki-61 spinners can for the HE-111 can be found on amazon. they are 50mm at the back plate of the diameter which should look scale to the German version of the HE-111

[tengarang]

Exciting news on the fifteenth of May 2019
MRC has released the Heinkel He111 1750mm (68.9")

I will be moving forward with the following setup BOM (Bill of Materials Below)


-Motor 3648 770KV with M6 threaded shaft to fit the stock spinner qty = 2: https://amzn.to/2LGqvLY

-FMS 10.5x7 3-Blade Propeller qty = 2: https://amzn.to/2YAxh7N

-Castle Creations CC Bec 10A 6S Switching Regulator: https://amzn.to/2LULoD8

-retracts standard qty = 2: https://www.motionrc.com/collections...pare-parts-tab

-Digital high torque Servos: https://hobbyking.com/en_us/turnigyt...sec-22-5g.html

-Motor shaft without hex for the 4 screw footprint of the 3648 770KV qty = 2: http://smallpartscnc.com/index.php?r...product_id=175

-Battery 3s qty = 2: https://www.motionrc.com/products/ad...xt60-connector

-Battery 4s qty = 2: https://amzn.to/2VBnL7j

-ESC first choice: FMS 70A with 5A SBEC https://amzn.to/30vSoKe

-ESC second choice: https://www.motionrc.com/products/zt...c-with-5a-sbec

-6800uF bypass cap to combine esc SBEC and 10ACC BEC external voltage stablization to rx for insurance: https://amzn.to/2LYw5tx

-Miscellaneous power cables and Y-harness

[tengarang]

[tengarang]

[tengarang]