SMALL - SMALL - Telemetry SMALL - Radio
Thread Tools
Old Mar 24, 2003, 07:48 PM
I plant balsa sticks too
luc's Avatar
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?

luc is offline Find More Posts by luc
Reply With Quote
Sign up now
to remove ads between posts
Old Mar 24, 2003, 08:13 PM
Registered User
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.

96S14 is offline Find More Posts by 96S14
Last edited by 96S14; Mar 24, 2003 at 10:53 PM.
Reply With Quote
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 G is offline Find More Posts by Mitch G
Reply With Quote
Old Mar 24, 2003, 11:48 PM
Registered User
Joined Oct 2002
28 Posts
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
GaryH is offline Find More Posts by GaryH
Reply With Quote
Old Mar 25, 2003, 01:01 AM
I plant balsa sticks too
luc's Avatar
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
luc is offline Find More Posts by luc
Reply With Quote
Old Mar 25, 2003, 02:55 PM
fly4fun's Avatar
Gilbert AZ
Joined Jun 2001
9,323 Posts
And by the Way the Castle Creations Phoenix 25 controller is terrific.

fly4fun is offline Find More Posts by fly4fun
Reply With Quote

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Which Motor For My HW 609 and FJ-3 Fury Joe Elston Electric Ducted Fan Jet Talk 17 Nov 30, 2002 11:40 AM
Which receiver for my Zero (Dual conversion vs. weight)...? sizam Parkflyers 8 Sep 24, 2002 03:54 AM
Which MEGA for LOGO 10 Karlosak Electric Heli Talk 2 Jun 07, 2002 07:47 PM
Help! Which motor for my Robbe P51!? marmal43 Foamies (Kits) 1 Dec 11, 2001 08:45 PM
Which battery for my X250 8 cell or 10 cell, help Joe Elston Sport Planes 4 Sep 19, 2001 03:16 PM