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Which prop with a 500mAh 2S 25C and a 2208 2150kv motor?

#1
Another question about batteries here. I want to use this 500mAh 2s 25C battery with this 2150kv motor from my AXN Floater-Jet. I am still learning about lipos, but the battery can put out a constant 12.5A (.5x25=12.5), right? So how big of a prop can I use with that motor? thanks!
 

earthsciteach

Moderator
Moderator
#3
Keep in mind that the limiting factor may be prop clearance of the tail boom. The prop will cut a very nice chunk out of the plane if the diameter is too big.

The bigger question is, why are you using a 500 mah 2s for that plane. That is WAAY underpowered! You'll want a minimum of 1300 mah, 3s with that motor and plane! I'd bet the 2s with 6x5 prop will barely keep the plane in the air.
 
#4
Keep in mind that the limiting factor may be prop clearance of the tail boom. The prop will cut a very nice chunk out of the plane if the diameter is too big.

The bigger question is, why are you using a 500 mah 2s for that plane. That is WAAY underpowered! You'll want a minimum of 1300 mah, 3s with that motor and plane! I'd bet the 2s with 6x5 prop will barely keep the plane in the air.
Hehe, sorry I forgot to say that I am using that motor on my Old Fogey scratch build. For my AXN, I use a 2200 with a 6x4 and it flies beautifully! I am going to place an order from hobbyking with various props and batteries so I can experiment with different setups, but I didn't want to put too big of a prop on and end up frying something. I was thinking I could go even bigger than a 6x4 because it is just a 2S or am I wrong?
 

Foam Addict

Squirrel member
#5
Actually, it would more than keep it in the air, but it would be super tailheavy!
I fly mine with a 1300 3s by the rudder and elevator servos for high performance, and a 4 cell 800 for blistering can'tkeeptrackofit speeds.
Get a couple of 30c 3 cell 1300's and be happy!
oops, just read it's for the fogey. Get a 30 or 35c batt, and make a superfogey!
use an 8x4 prop on two cell, but upgrade the c rating!
 
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#6
Actually, it would more than keep it in the air, but it would be super tailheavy!
I fly mine with a 1300 3s by the rudder and elevator servos for high performance, and a 4 cell 800 for blistering can'tkeeptrackofit speeds.
Get a couple of 30c 3 cell 1300's and be happy!
oops, just read it's for the fogey. Get a 30 or 35c batt, and make a superfogey!
use an 8x4 prop on two cell, but upgrade the c rating!
You can run the AXN on a 4S? With the stock motor and ESC? Also, which prop?

Getting a higher C rating for a superfogey does sound fun and I might try that! But I also want to try to fly this plane indoors so for that I think I will need the 2s 500mAh.
 

Foam Addict

Squirrel member
#7
Yes, all stock. stock motor, prop, and esc.
I got it up to 96.3 with clipped wings and a slight tailwind on a 4 cell.
I am working on super fogey mark II at the moment. Mark I had a 60" span!
 

Foam Addict

Squirrel member
#9
My advice is wait for a cool-cold day 32f-50f with low pressure, and then it should get that fast. Mine had superclipped wings, until I realized that air launching it from my sensei is not a good long term solution!:black_eyed: I'll post a measurement later. Make sure to tighten up your set screws after flight, so the motor can't leave unannounced.
Also, I have never flown 4s when the temps are above 50f. so...
Good luck!
I am always willing to help.:)