Respected Seniors.

I am new for RC flying. now i completed scratch build FT Explorer.  my prop is 1045R. Motor rotating Clockwise whice  produce air towards nose side. I attached its photo here.  I know something goes wrong, am i using wrong prop or motor rotating in wrong direction!?

Plz guide me what should i do to set the correct prop & correct rotation.

with regards

Vijay

Following things to be looked at if the prop is a regular prop( CCW) in a pusher plane
1. looking at the plane from the front.( Nose point towards you) the Prop must rotate counterclockwise.
2. The marking on the prop( prop details) inscribed on the prop need to be facing towards the front.

This should help

1. Reverse rotation direction (by interchanging any two wires from the Esc to the motor)

2. Remove the prop and put it back with its convex surface facing foward, ie towards nose.

3. Prop may be too big. Pl post motor ID (like 2826, 2212 etc) and rated rpm/volt (like 1100kv, 1400kv etc. Also say whether using 2s or 3s Lipo.

Best wishes.

KK Iyer Sir,
Motor : A2212 / 2200Kv
Bty :   2200 mAh 3S LiPo

@vijayrithik,

I find that some vendors are supplying this 2212, 2200kv motor with a 10x4.5 prop.
This is totally unsuitable, especially on 3s.

These 2212 size motors come in different variants like 1000kv, 1400kv, 1800kv, 2200kv etc.
The purpose is to support props of different sizes diameter and pitch.

A large light model (with low wing loading) will need a large diameter prop. With low pitch and/or low rpm, as it will fly slowly. Low rpm means either low voltage (eg, 2s) or low kv (eg, 1000kv)

A small heavy model (with high wing loading) will need to fly fast, for which it needs a higher pitch and/or higher rpm. Higher rpm means either higher voltage (eg, 3s) or higher kv (eg, 1400-1800kv)

And at higher rpm, you have use a smaller dia prop to avoid overloading the motor.

Please try this test:
Run the motor with the 10x4.5 prop and 3s lipo at full throttle for a few seconds. Be very careful as a blade could break off and hit you causing serious injury. Stop the motor at once if you get a burning smell. Otherwise stop it after 10-15 seconds and feel it’s temperature. If it feels hot, or even warm after such a short run, it is overloaded. Ie, the prop is too big.

As far as I can make out, these motors are rated for 10amps continuous (12a for max 30 seconds).
If you have a wattmeter, it’s easy to check whether this is being exceeded. Otherwise try to borrow an ammeter...

BTW, I’m using a 6x3 prop on a 2200kv motor (after a 7x3.5 threw a blade due to too high rpm!)

Regards

P.S.
Here’s an interesting exercise.
Calculate the speed of the tip of the prop...

iyer sir pls correct me if i am wrong
it will suit 7x4 pro max for saving the motor
for his model 1000kv or 1100kv motor will suit for better result

Alex,
The recommendation in the FT Explorer specs is prop size 8x4.5 - 9x6 with 3s lipo and a 1000kv motor
With 3s and 2200kv, even a 7x4 would overload...

Vijay,
See my Whatsapp msg of 19th Sep last year!
Still in Jhansi Cantonment?
Regards

Edit
Contact Alex Bessie (Madurai). He has made really good progress in the last 6 months

Yes sir, I am in Jhansi. Sure i will contact Mr Alex Bessie who already texted me with his contact No.
 
I am regret to say, i could not review your valuable guidance from our whatsapp chat as my mob software crashed in Dec 2019 and thus unable to recover old msg in watsapp.

sir how to calculate the speed of tip of prop?  how to it find?

Im owed to thank you KK Iyer sir, Rooster sir and Bessie sir for your guidance. After i go through your info i did the follwings :-

1.  I changed rotation of motor from CCW to CW spin (bcoz Reverse prop (1045R, 9047R & 8045R) only avlb with me at present).

2. Mounted the prop convex surface facing towards nose of plane.and the prop push the plane forword.

As per Iyer sir suggestions, my action and its reactions are :-

1. run the motor with prop 8x4.5 for 30 sec in full throttle. Felt high heat in Motor & ESC (30A).

2. Run the motor with Prop 9x4.7 for 30 Sec in full throttle. Felt high heat in motor & ESC.  I felt good thrush comparing to 8*4.5 prop thrust.

3.  Now used 10x45 prop and run with due cautions & motor ran upto 25% throttle speed only, thereafter the motor speed redued despite increased the throttle. So I disconned the Bty. Felt normal heat in motor and ESC.

i gave good time to cool the motor&ESC betwn test 1 2 3.

Vijay, dont use any prop bigger than 7 inch,that too on low rpm. Better use 5 or 6 inch.
have used this motor,
6*4 will be best match in regards to power consumption, thrust and avoid over heating of motor.

Thank Manoj. I have to order once lock lifted off.