I am new member in the X-UAV Talon club, I have just received my Talon with the extension wing.
I'm working to put the right combination of motors, prop and batteries:
I am looking to have the maximum flight duration over 90 minutes.
The weight of my FPV gear with all antennas, cables, cameras is around 750g.
The weight of the talon + motors + ESC + servo is around 1400g, So the total weight without the batteries is around 2150g
Regarding the battery, I can use multiple options based on motors and prop:
Multistar Battery Weights:
3S 5200 mAh is 325g.
4S 5200 mAh is 433g.
Option1: 3S configuration 2 parallel batteries => 3S 10,400 mAh: 650g. Total flight weight 2,800g
Option 2: 6S configuration, 2 series batteries => 6S 5,200 mAh: 650g, Total flight weight 2,800g
Option 3: 4S configuration, 2 parallel battery => 4S 10,400 mAh: 866g.Total Flight weight: 3,016 g
Option 4: 3S configuration 4 parallel batteries => 3S 20,800 mAh: 1300g. Total flight weight 3,450g
Option 5: 6S configuration 2 parallel + 2 series => 6S 10,400 mAh: 1300g.Total flight weight 3,450g.
What motors and prop should we use with every option, and what flight duration will we get?
I have those motors: but I can buy others if needed:
Motor 1: OSMG9530 http://www.osengines.com/motors/motors/motor-specifications.pdf
OMA-3825-750 (.30 Size)
Rotor Diameter (mm): 38
Magnet Length (mm): 25
Weight (oz/g): 6.7 (190)
Motor 2: Jamara E-Motor Magnum A2820/6
Specifications Revolutions / v : 1000
Internal resistance : 59mOhm
Idle current: 2.0A
Max A: 37A / 60S
Shaft Diameter : 4.00mm
NiMH Battery : 8 ~ 14
LiPo Battery : 3 ~ 5
Propeller NiMH: 11x8 Propeller LiPo : 3xLiPo 11x6 / 10x7 4xLiPo
Motor 3: Emax BL2826/06: http://www.toysonics.com/emax-bl2826-06-950rpm-v-outrunner-brushles...
New Emax BL2826/06 950Rpm/V Outrunner Brushless Motor
No. Of cells: 3-4 Li-Poly
Max. efficiency: 86%
Max. efficiency current: 20- 30 A (>78%)
No load current / 10V: 2.1 A
Current capacity 61 A/60s
Dimensions: 30x26 mm
Shaft diameter: 5 mm
Weight: 182 g/6.41 oz
Recommended model weight: 2-3.2 kg
Recommended prop without gearbox: 13*8; 12*8
A 40 A ESC "should" be fine, you won't be drawing that much current.
Don't use wooden props, the tips will hit grass/twigs, etc on landing, and break.
I am using 3S and I see 37A + when I am at maximum speed. that's why I prefer 75A and already I had the 100A so I am ok with it.
I don't know if there is some negativity in it. is there?
I have been developing multicopters so no deep knowledge for planes.
I got the idea against wooden props.
Actually, I think the same danger (hitting the grass/twigs) exists for APC props.
I have never used wooden but will try.
@Eliot,the negativity is price.
ZTW 40A opto 600hz esc $14 while 90A opto YEP esc $111.
Anyway any esc opinion for sunnysky 3508 580kv?
Baris, my current measurements are somewhere on this blog....
APC props get marks on the from hitting grass, etc, but they don't break easily.
Electric wooden props are very flimsy.......
For landing I cut all power, and let the motor windmill, it sort of acts as an airbrake.
Also, if it is spinning on landing, it won't hook up easily.
My feeling is that a stationary prop can hook up solidly with vegetation, and rip the motor out, or break. I've seen that happenon someone else's aircraft...
First of all, thank you for documenting and providing your results.
Did you use a folding prop on your talon?
I think it was smart of you to stick w/ 3s since all VTX runs without stepping down voltage on 3s which is quite nice.
Did you ever make a comparison with Li-Ion batteries vs your multistar?
My Talon with wing extensions has a 3548 900 KV Turnigy motor, 12x8 prop, 12000mAH 3S battery pack, and even no wind hand launch I do standing still.
I have a APM 2x in it, launch in manual mode, with full up elevator trim.
I found that the CG is better 10mm to the rear from the markings on the wing.
Once it is in the air I move the trim back to center.
Best airspeed for me is 60KM/H, It can easily stay up for 60 minutes
Maybe you can help advise a good motor for the following setup:
-I have flown a Talon with a T Motor 3510-700Kv on 4S, 13x8 Graupner propeller : fine up to 3.5Kg for taking off with no Wind. This motor config provides a maximum thrust of 1700 grams.
-Issue : the weight of the plane is now 4.5Kg (more payload) and it does not take off without Wind (it takes off fine with Wind). I concluded that this motor config is a bit too weak for taking off 4.5Kg (although I have the wing extensions)
-So I'd like to find a good motor providing more thrust (than the current max of 1700g), probably a thrust required of 2.2 Kg.
-I was thinking about the Cobra 3520/12 but it is not available in Europe.
Do you know of a similar spec'd motor that can be purcahsed in Europe ?
I'm no expert on electric motors, and I don't like eCalc either :-)
As I posted earlier, my setup works for me, but then, I only fly with two GoPro's
I use Turnigy motors and 3S packs, that way all 12V cameras and other electronics etc. can run directly off the flight batteries, if I choose to fit such.
If I were you, I would fit a 3548 1100 Kv motor, 13x8 eFlight prop, and 3S packs.
Your 3510 700Kv motor sounds a bit weak for payload, even on 4S packs.
This one with 3S should run at about 500-600 W, depending on propeller size, should put you in the correct "watts per pound" rating.
I normally work on 100 Watts per pound of aircraft......
Yeah, that is my call, on a 3S pack you will be drawing 7 to 9 Amps @ 60 Km/h airspeed.
Not too sure what you have in the nose, I had to put 3x 4000 or 5000 mA/h 3S packs to get the CG right.
Most of my build pictures are here somewhere on the forum.
(And other nonsense I might have written !)
So @ total 15000 mA/h, drawing 10 Amp, a perfect world gives me 1.5 hours.
This is @ 200m ASL.
As I mentioned, running my build through eCalc gives me nowhere near what I have proven in the real world.
Full throttle hand launch takes about 20 Amp, cruise @ 60 Km/h just below half throttle.
Flying in Auto varies 7 to 9 Amp.
I don't fly commercial, and lost my field a while back, but soon will be in the game again :-)
thx for the advice. Will take a look at this motor and test it.
Indeed my 3510 700Kv + 13" props is perfect for endurance (we fly easily 90 min with LI-Ion self made pack 4S 23800mah) for a 4.5Kg total, but not so good for taking off.