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Old Mar 24, 2003, 07:48 PM
luc
I plant balsa sticks too
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France
Joined Feb 2000
3,585 Posts
Which mega for my pylon racer

I am looking for 2 combinatrions:
1- on 8 batteries (kan 950), a motor that draws around 10 to 12A (no more ) on a 4.7 *4.7 cam prop
2- Same amps , but on a pack 3S2P of ET1200, which gives roughly 10V.
I am a bit puzzled with motocalc results...anybody has real computations?
lastly last question: is the phoenix 25 a good controller (reliable and efficient) for these motors?

thx
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Old Mar 24, 2003, 08:13 PM
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96S14's Avatar
Calgary, Alberta, Canada
Joined Oct 2002
739 Posts
I have the 16/15/5 and it is probably a little too tame for your target current draw. I draw 15.5A with an Aeronaut 7 x 7 Elektro Carbon prop on 8 HEcells (at 3000 ft). When I had a 5 x 5 on the motor, it seemed to draw under 10A (though I never did measure that setup.) It got 8 minutes of full throttle flight on 8 HEcells...putting the current at around 7-8 A.

I know the 3 turn is pretty hot, so my vote is for the 4 turn wind.

I used Motocalc to size the motor on my Nooner, and was very discouraged to see it predict so poorly. Motocalc predicted a "hotter" motor than what the Mega 5 turn really is. In retrospect, I would have gone with the 4 or 3 turn myself.

Overall, I am impressed with the quality of the Mega, considering its cost.

I don't have any personal experience with the Phoenix 25. I use the Hacker Master 18A contoller and am very impressed with it

Anyways, I hope there's some useful information amongst my ramblings. Good luck.

Ryan.
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Last edited by 96S14; Mar 24, 2003 at 10:53 PM.
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Old Mar 24, 2003, 10:06 PM
Mitch G's Avatar
Naperville, IL USA
Joined Nov 2000
1,886 Posts
Here's some static data I have recorded:

16/15/4, 8x600AE, 5x5 APC-E prop: 11-12A

16/15/5, 8x600AE, 5.5x4.5 APC-E prop: ~9A


Also, I have seen the following data but haven't measured it myself:

16/15/3, 8x600AE, 4.75x4.75 prop: 15.5A

16/15/4, 8x600AE, 4.75x4.75 prop: 10.8A


So, I think the 16/15/4 is probaby the right motor for your requirements.


Mitch
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Old Mar 24, 2003, 11:48 PM
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Joined Oct 2002
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Motor: Mega ACn 16-7-7; 2450rpm/V; 0.047 Ohms; 0.9A idle.
Battery: Hecell; 8 cells; 1050mAh @ 1.2V; 0.0135 Ohms/cell.
Speed Control: Castle Creations Phoenix 10; 0.0013 Ohms; High rate.
Drive System: 4.7x4.7

motor calc gives this combo at about 12 amps
with a efficiency thats above 80% thats pretty good
i have the mega 16-7-7 i havent run it on eight cells
i have run it on 6 cells hecells and 2 series lipoly batterys
at with a little bigger prop 6x3
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Old Mar 25, 2003, 01:01 AM
luc
I plant balsa sticks too
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France
Joined Feb 2000
3,585 Posts
Yhx mitch and Ryan
That's what I was waiting. I will shoot for the /4, that will fit my need
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Old Mar 25, 2003, 02:55 PM
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fly4fun's Avatar
Gilbert AZ
Joined Jun 2001
9,323 Posts
And by the Way the Castle Creations Phoenix 25 controller is terrific.

DAvid
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