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Old Apr 26, 2012, 01:52 PM
Registered User
Deer Park, Tx (East side of Houston)
Joined Oct 2009
161 Posts
Question
Prop selection advice Hacker A40-10S on 4S1P

Hello,

Yes I have a watt meter and Castle Creation data logging but what I don't have is a bunch of props to play with when I get home. I have a 15x7 APC.

I'm not a 3D flyer...yet. I'd like to learn but until then I'm a sport flyer with 3D asperations.

Anyone have a swag as to proper prop selection for a Hacker A40-10S on 4000mah 4S1P battery?

It is about 100 mile RT from home to nearest hobby shop but only 2 miles from where I work. I'm at work today but not again until next Tuesday

I guess I feel like I should get something in case the 15x7 is to much prop.

Any guidance would be appreciated.
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Old Apr 26, 2012, 07:20 PM
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Dr Kiwi's Avatar
Chattanooga, Tennessee, United States
Joined May 2003
27,206 Posts
Unless that motor is good for 112A/1600W... then yes, MotoCalc says that a 15x7 would be too much.


Motor: Hacker A40 10S; 880rpm/V; 3.8A no-load; 0.007 Ohms.
Battery: Thunder Power TP5200 (G4 ProRace 50C) (50C); 4 cells; 5200mAh @ 3.7V; 0.001 Ohms/cell.
Speed Control: Castle Creations Phoenix 60; 0.0012 Ohms; High rate.
Drive System: Direct; 15x7 (Pconst=1.17; Tconst=1) direct drive.
Airframe: Anything you want.
Conditions: 700ft above Sea Level, 29.92inHg, 68F
Motor Amps = 112.7
Motor Volts = 14.2
Input (W) = 1602.1
Prop RPM = 8965
Thrust (oz) = 187.6
PSpd (mph) = 59.4

Since the original Hacker A40-010S is rated for 900W/40A max, and even the new V2 is rated for only 1000W/50A max... it will be toast with a 15x7! On 4s 10x7 seems to be about it as far as amp draw goes... if you want to approach 1000W and yet keep amp draw between 40A-50A... you need about 6s and an even smaller prop.
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Last edited by Dr Kiwi; Apr 26, 2012 at 07:31 PM.
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Old Apr 26, 2012, 08:03 PM
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scirocco's Avatar
Australia, ACT, Kambah
Joined Feb 2001
3,273 Posts
Assuming it's the V2, it will remain within its limits on 4S with 13" up to 13x10, or 14" up to 14x7.

I'd pick up a 13x6.5 and a 13x8 if you're looking for around 650-750 W in

12x6 > 520W, 12x8 > 620W, 12x10 > 715W.

Just don't try the 15x7 on 4S. It would be a reasonable slow speed/3D choice on 3S for about 50A/500W, but you'd need biggish packs to deliver the 50 odd amps.

Dead easy to what if in ecalc - the motor is listed
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