Question about a propeller

[NathanSchool]

Hey forum! I was wondering where I can find resources regarding the correct electronic parts for a propeller that has these generic specifications:

• 13x6.5 Carbon Fiber Electric Propeller for RC Airplane
• Size: 13x6.5
• Mounting Hole: 8mm
• Adaptor Rings: 1x 5mm /1x 6mm
• Hub Thickness: 8mm

Thank you!

 

[luvmy40]

Hmm, usually people size their motor and ESC to a specific model plane and then choose the prop based on the motor and battery combination.

I am far from an expert on this, but I would say you want a larger can, low kv(1000kv or less?) motor with that big, fairly aggressive prop.

 

[Mr NCT]

Hey forum! I was wondering where I can find resources regarding the correct electronic parts for a propeller that has these generic specifications:

• 13x6.5 Carbon Fiber Electric Propeller for RC Airplane
• Size: 13x6.5
• Mounting Hole: 8mm
• Adaptor Rings: 1x 5mm /1x 6mm
• Hub Thickness: 8mm

Thank you!

A Cobra C3520/10 980kva motor has a 5mm shaft and with a 3 cell lipo will give you 2438 grams thrust at 47.5 Amps but an 80 amp ESC is recommended.
https://innov8tivedesigns.com/images/specs/Cobra_3520-10_Specs.htm

 

[danskis]

Well - google is your friend. It probably doesn't have to be carbon fiber. Some more info would help. Do you have the motor yet? What's the motor going on, etc.

 

[NathanSchool]

Well - google is your friend. It probably doesn't have to be carbon fiber. Some more info would help. Do you have the motor yet? What's the motor going on, etc.

I'm currently looking at a Typhoon HET EDF 700-83 Motor 39mm 630Kv (8mm shaft) to attach to the prop.

 

[NathanSchool]

A Cobra C3520/10 980kva motor has a 5mm shaft and with a 3 cell lipo will give you 2438 grams thrust at 47.5 Amps but an 80 amp ESC is recommended.
https://innov8tivedesigns.com/images/specs/Cobra_3520-10_Specs.htm

Will the motor fit the prop?

 

[HVB79]

Maybe you already know this but don't need or want a motor with a 8mm shaft.

Most of the time people use a motor with a smaller shaft, for example 5mm, and a prop adapter that would be in this example 5mm on the shaft side and 8mm on the prop side. Given that you have rings for 5mm and 6mm you could also use an adapter with an output dynamiter of 5 or 6 mm.
For Example This Adapter

 

[Mr NCT]

Will the motor fit the prop?

I looked up the Typhoon HET EDF 700-83 Motor 39mm 630Kv and it says it's for turbines. It's not a motor I know anything about. The Cobra motor definitely will.

 

[NathanSchool]

Could this motor work: https://store.flitetest.com/emax-cf2822-1200kv-motor/

 

[HVB79]

Could this motor work: https://store.flitetest.com/emax-cf2822-1200kv-motor/

No, that motor is far to small and high KV.

You need something more like this:
https://store.flitetest.com/ft-radial-4030-510kv-monster-brushless-motor/
This motor is a bit oversized but everything else in the Flite Test store is too small.
Also because it has an threaded 8mm adapter built into the motor bell you don't need a prop adapter.

 

[NathanSchool]

No, that motor is far to small and high KV.

You need something more like this:
https://store.flitetest.com/ft-radial-4030-510kv-monster-brushless-motor/
This motor is a bit oversized but everything else in the Flite Test store is too small.
Also because it has an threaded 8mm adapter built into the motor bell you don't need a prop adapter.

Would a 3-cell LiPo battery be recommended with this motor?

 

[NathanSchool]

Is an 80 A ESC still needed if I go with this motor?

 

[Mr NCT]

Is an 80 A ESC still needed if I go with this motor?

The store doesn't spec an ESC but the one review said that it drew 90A in a static test.

 

[HVB79]

You could run the 4030 510kv motor on 3 to 6 cell LiPo battery. The amps are going to depend on how many cells you are using.

With a 13x6.5 and a 510kv motor you would want more cells not less as a 13 inch prop is relatively small for this motor. That is assuming you want to get the most thrust out of the system. If you don't need that much thrust you could setup a system with a 3s battery.

Go spend some time trying out different combinations over on the ecalc website. Doing this will help you get a better understanding of the different ways a 13x6.5 prop can be used and what size motors are reasonable.

https://www.ecalc.ch/motorcalc.php

 

[Mr NCT]

So you have a propeller. Are you trying to build a plane around that propeller or doing something else? Please let us know so we can be more helpful.

 

[Aslansmonkey]

My Scout XL swings a 13x6.5 prop using a Sunnysky 2820 800kv motor. I don't remember the ESC but I think it's a 60a or 80a.

I've flown it on both 3S and 4S batteries.

Here's a link to the motor, should you be interested...

https://sunnyskyusa.com/products/sunnysky-x2820-brushless-motors

 

[NathanSchool]

So you have a propeller. Are you trying to build a plane around that propeller or doing something else? Please let us know so we can be more helpful.

Yes I'm trying to build a plane around the Prop.

 

[danskis]

You can save yourself a ton of $$$$ by building your plane around a $20 motor. Or just pick a plane that you like that recommends a $20 motor.