Help! Selection of Motor,Propeller,Battery,ESC for high speed aerobatics

[Karthik1130]

Hi all,
I have made the FT Spitfire with 48inch wingspan and correspondingly increased the size of fuselage proportiontely.I want to learn fast aerobatic flying with this warbird. What should be the motor,esc,battery,propeller for this enlarged plane to learn high speed aerobatics? Please help!
How to learn the selection of this components?

Please help!

Regards,
Karthik

 

[TEAJR66]

You could use the radial "C" pack on 3s and get great performance. When you want to speed it up, 4s and a 9x6 prop.
If that wing is longer than the original design, you will want a carbon spar to keep the wing stiff.

 

[Karthik1130]

Today,maiden flight was a success with FT Spitfire Master series.
But, unfortunately the ESC burnt down completely in mid-flight and crashed.
The following were the hardware used:
1) Motor: Ready to sky- A2212 2200KV brushless motor
2) ESC: Simonk generic 30A
3) Battery: Orange LiPo 3S 1300mAH
4) Propeller: Orange HD Propeller 9045
4) Servo: TowerPro 9g servo


Handlaunched the plane with 3/4 of throttle. It elevated smoothly and flew for 5 seconds and then ESC burnt down in fire completely.

Please help why this has happened? what should be the setup required for performance and high-speed aerobatics?

 

[Mr NCT]

Today,maiden flight was a success with FT Spitfire Master series.
But, unfortunately the ESC burnt down completely in mid-flight and crashed.
The following were the hardware used:
1) Motor: Ready to sky- A2212 2200KV brushless motor
2) ESC: Simonk generic 30A
3) Battery: Orange LiPo 3S 1300mAH
4) Propeller: Orange HD Propeller 9045
4) Servo: TowerPro 9g servo


Handlaunched the plane with 3/4 of throttle. It elevated smoothly and flew for 5 seconds and then ESC burnt down in fire completely.

Please help why this has happened? what should be the setup required for performance and high-speed aerobatics?

That motor with a 6x5.5 prop will draw almost 35 amps. Your motor is too small for that airplane and the prop you are using. Flite Test recommends:

• Motor: Radial 2218/1180Kv
• ESC: Flite Test 40A
• Propellers: 10 x 4.5

 

[Karthik1130]

The following are the hardware planning to use:
1.DYS D3548-4 1100kv BLDC Motor
2.Readytosky 80A ESC 2-6S Brushless ESC Speed Controller
3.Orange 3300mAh 4S 25C/50C (14.8V) Lithium Polymer Battery Pack
4.Propeller Electric 12X6

Is the above hardware ok to use for high speed aerobatics? Please suggest.

Additionally,a A2212 1400kV motor is available. Can I use 4S battery with 9 inch propeller, 30A ESC for this motor?

 

[Merv]

...Is the above hardware ok to use...

I think it will be OK. You should test is on a watt meter to be sure. They are not very expensive, less than $30.

I'm currently using a DYS 3530 1700kv with a 8x8 prop, 50 amp esc 2200 3S battery. It goes pretty fast.

Another test, run it full throttle for 10 seconds, the stop, check the temperatures of the motor, esc & battery by touching them. Warm is OK, but if so hot you don't want to hold them, then stop. Try a smaller prop. If it passes, try a 30 second run. If it passes, try a 60 second run. If it passes, it's time for a fly. It always a good practice to check the temp of everything when you land. Stuff that worked when it mild outside, may over heat when it's hot outside.

 

[Karthik1130]

I think it will be OK. You should test is on a watt meter to be sure. They are not very expensive, less than $30.

I'm currently using a DYS 3530 1700kv with a 8x8 prop, 50 amp esc 2200 3S battery. It goes pretty fast.

Another test, run it full throttle for 10 seconds, the stop, check the temperatures of the motor, esc & battery by touching them. Warm is OK, but if so hot you don't want to hold them, then stop. Try a smaller prop. If it passes, try a 30 second run. If it passes, try a 60 second run. If it passes, it's time for a fly. It always a good practice to check the temp of everything when you land. Stuff that worked when it mild outside, may over heat when it's hot outside.

I have carried out the test as you mentioned with the 2s lipo 850mAh with 9045 propeller and 30A ESC on A2212 1400kV motor. It was working good in full throttle for 1minute in bench test.
Can I use the above-mentioned parts, except instead of 2s a 4s lipo?
But,the motor specification sheet says only upto 3s lipo is recommended.

Please help! what will happen if I use 4s lipo on this motor? can I use the same 30A ESC with this 4s lipo?

 

[Merv]

...Can I use the above-mentioned parts, except instead of 2s a 4s lipo?...

Maybe but probably not, if you go to a 3S or 4S, you must redo the test above.

Increasing the cell count, that is going from 2S to 3S, increases the voltage. This makes the motor spin faster, which will increase the amp draw. The current prop may be too big, you may need a smaller prop for 3 or 4S. A smaller prop reduces the amp draw. You will not know until you test it.

The motor will likely be Ok going to 4S, provided you use the correct size prop. I can't say the same for the ESC, the eltronics inside may not tolerate 4S. You will just need to see what it is rated for. If it is rated for 4S or more, you will be OK. Provided you don't exceed the amps.

Sounds like you need to be on the lookout for a watt meter.

 

[Piotrsko]

I will add: 4S instead of 2S may spin the prop so fast that the tips go supersonic and you lose thrust just to make noise. Ever wonder why drones and quads are so noisy?

 

[Karthik1130]

Thanks a lot, everyone.gonna try the 9045 propeller on 3S 3300mAh lipo battery, on A2212 1400kV motor. After gluing the fuselage skin over the tail end bulkheads using foam by incorporating FT master series construction method,the strength at the tail end has increased remarkably.

 

[Karthik1130]

It was a failure. couldn't able to do self launching. it didn't take off, instead it crashed within few metres and the bamboo skewers in the front of the powerpod came out of the fuselage.
After that, used packaging tape to prevent the wobble of powerpod under full throttle, during handlaunching, but it crashed again. The right wing, and the front end of fuselage got broken.

During the first launch, I made some mistake, which I am not sure what it was.
Please help!

 

[Karthik1130]

Today , tried again with self handlaunching. It was a complete success.
but unfortunately the wings got broken in mid-flight, as I didn't provide foam spar in the middle section of wing.
I found installing foam spar connecting two wing half in the center difficult, and spar gets broken, while installing.

Can we use MDF board of 3mm thickness as spar? Here plywood of 6mm is only available.
or what other alternative material available?

 

[Mr NCT]

Today , tried again with self handlaunching. It was a complete success.
but unfortunately the wings got broken in mid-flight, as I didn't provide foam spar in the middle section of wing.
I found installing foam spar connecting two wing half in the center difficult, and spar gets broken, while installing.

Can we use MDF board of 3mm thickness as spar? Here plywood of 6mm is only available.
or what other alternative material available? View attachment 244513

Bamboo skewer sticks work well.

https://a.co/d/0fUZIR4Q

 

[Karthik1130]

This time , have installed straight plywood wingspar of thickness 5mm shaped in a rectangle of length 1.5mm and breadth of 30mm.
This is a flat wing with no dihedral.

Regards,
Karthik

 

[Karthik1130]

The maiden was a complete success, under windy condition of 25km/h.
Roll characteristics were docile.A slow trainer aircraft for everyone.
But crashed unfortunately while landing.

 

[Karthik1130]

In every build, always getting across a problem in control rod Link between servo arm and control horn. Its always going as a trial and test for the correct selection of servo arm hole for complete range of motion of the control surface.
The servo makes jitter sound at extreme end and then gets repaired. How to achieve the full allowable range of motion as shown in flite test build video?