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Old Dec 29, 2011, 08:43 AM
Shut up and Fly!!!
jw357_23043's Avatar
United States, VA, Hartfield
Joined Aug 2011
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Quote:
Originally Posted by hercdriver7777 View Post
20c would work. The other part of the equation is that the higher the C rating the better the battery will hold voltage under load giving you more power. And again different mfgs under or overrate their packs. In this case I would look for something in the 25-40c range.
Thanks Herc,
I'm going with the 30 to 40 range. More power is better.
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Old Jan 09, 2012, 07:19 PM
Registered User
Melbourne, Australia
Joined Sep 2007
41 Posts
hi everyone,

i'm after some advice on motor/prop/battery setup.

i prefer to use Scorpion motors and in other replies I've read that the 4035-330 and 4035-250 are good choices.

some suggestions on a setup to be used 75% precision flying and 25% 3D would be great. i already have a few other models for 3D only (PA Addiction X, Ultimate AMR) but I'm after something larger for competitions and handling the wind a bit better, that's why i'm looking at the EF Extra.

thanks, fj
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Old Jan 09, 2012, 10:57 PM
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USA, GA, Cochran
Joined Jun 2008
20,175 Posts
Quote:
Originally Posted by fjaust View Post
hi everyone,

i'm after some advice on motor/prop/battery setup.

i prefer to use Scorpion motors and in other replies I've read that the 4035-330 and 4035-250 are good choices.

some suggestions on a setup to be used 75% precision flying and 25% 3D would be great. i already have a few other models for 3D only (PA Addiction X, Ultimate AMR) but I'm after something larger for competitions and handling the wind a bit better, that's why i'm looking at the EF Extra.

thanks, fj
if you are going after handling wind better,and I'm guessing some iMac stuff,and you are decided on the scorpions,Id suggest going 8s like around 4000 mah,and the lower kv 4035.you will probably be in the 20x8 or 20x10 area for a prop depending on the watts and amps you are looking for.
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Old Jan 10, 2012, 04:41 AM
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Melbourne, Australia
Joined Sep 2007
41 Posts
thanks for the response manta.

i've calculated some different combinations and the Scorpion 4035-230 on 8S and either a 20x10E or 19x12E will give around about the same peformance - the 19x12 will actually give slightly more static thrust (around 3% more) but amps/watts stay around the same mark (70 amps, 2050 watts approx.).

now i just need to decide on battery size - 4000 or 5000 mAh. i might wait until most of the plane is together and weigh it before deciding on battery size.

thanks again for the help.
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Old Jan 10, 2012, 06:07 AM
Advocating for RC Aviation
USA, NJ, Phillipsburg
Joined Jul 2010
1,390 Posts
With the recommended Axi at the top of this thread, mine is equally capable in 3D and IMAC (flew some basic last season) on 8S 5000's (18x8 Xoar). If one wants to fly the sequence twice, I would not recommend less than 5000 x2. If one is more into hucking, perhaps 4000's would be enough? And lots of 3D oriented folks have gone 6S on this thread, as I recall. 230 is a very low KV and more of a 9-10S KV by my experience, FWIW. Cheers! Dana
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Old Jan 10, 2012, 06:00 PM
Shut up and Fly!!!
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United States, VA, Hartfield
Joined Aug 2011
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Quote:
Originally Posted by Manta1 View Post
if you are going after handling wind better,and I'm guessing some iMac stuff,and you are decided on the scorpions,Id suggest going 8s like around 4000 mah,and the lower kv 4035.you will probably be in the 20x8 or 20x10 area for a prop depending on the watts and amps you are looking for.
Wow!! All I can say is that the 230kv must be a monster!! I'm running 320kv and it pulls with massive amounts of power on 8s 5000.
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Old Jan 11, 2012, 11:43 AM
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USA, GA, Cochran
Joined Jun 2008
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Quote:
Originally Posted by fjaust View Post
thanks for the response manta.

i've calculated some different combinations and the Scorpion 4035-230 on 8S and either a 20x10E or 19x12E will give around about the same peformance - the 19x12 will actually give slightly more static thrust (around 3% more) but amps/watts stay around the same mark (70 amps, 2050 watts approx.).

now i just need to decide on battery size - 4000 or 5000 mAh. i might wait until most of the plane is together and weigh it before deciding on battery size.

thanks again for the help.
You are welcome.I m trying to power my planes with less amps/more efficiently.So I like a little more voltage (8s) I run a 4325-280 motrolfly and get around 2200 watts with a 20x8 carbon fiber prop and only pull around 69 amps..Temps stay happy.pull out is very generous. So i figured with the scorpion the kv closer to the one i run should be similar..cant wait to see you huck it.


Quote:
Originally Posted by jw357_23043 View Post
Wow!! All I can say is that the 230kv must be a monster!! I'm running 320kv and it pulls with massive amounts of power on 8s 5000.
yea 230kv may need a good bit bigger prop for 8s.320kv with a lil smaller prop around 19 inches may be better.
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Old Jan 12, 2012, 08:43 AM
Shut up and Fly!!!
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United States, VA, Hartfield
Joined Aug 2011
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yea 230kv may need a good bit bigger prop for 8s.320kv with a lil smaller prop around 19 inches may be better.[/QUOTE]

I was thinking of going with a 19x10 and see how efficient it works. Any recommendations? I have a Xoar 18x8 now and it runs at 50 amps on 8s 5000.
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Old Jan 13, 2012, 07:43 PM
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Melbourne, Australia
Joined Sep 2007
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i'm undecided about using Savox 1251MG's or 1258TG's for ailerons and elevators. if i'm going to run 8S batteries do you think i'll need the extra weight of the 1258TG's in the tail?

thanks, fj
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Old Jan 13, 2012, 08:26 PM
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Columbia SC
Joined Feb 2005
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The battery tray has more room to grow towards the nose. So, heavier servos in back would not be an issue.
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Old Jan 13, 2012, 09:07 PM
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Melbourne, Australia
Joined Sep 2007
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thanks herc.
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Old Jan 15, 2012, 11:45 AM
DFC~ We Do Flyin' Right
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Joined Nov 2008
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Just found this thread... I got lots of reading to do.
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Old Jan 15, 2012, 03:14 PM
I am ready for HHAEFI!!
powerlines's Avatar
United States, GA, Cochran
Joined Apr 2004
6,573 Posts
Quote:
Originally Posted by hercdriver7777 View Post
The battery tray has more room to grow towards the nose. So, heavier servos in back would not be an issue.
This is True.. I am running the recomended in the back.. I have my 6S batt on the wing tube.. I may have to put some stronger servos in the tail before SEFF!!
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Old Jan 16, 2012, 01:19 AM
Shut up and Fly!!!
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United States, VA, Hartfield
Joined Aug 2011
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Originally Posted by powerlines View Post
This is True.. I am running the recomended in the back.. I have my 6S batt on the wing tube.. I may have to put some stronger servos in the tail before SEFF!!
What kv motor are you running again? Also, what is the empty weight of your EF Extra300?
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Old Jan 16, 2012, 04:28 AM
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Melbourne, Australia
Joined Sep 2007
41 Posts
I ordered my Extra today, the orange/blue one. Can't wait for it to get here !!! Hopefully it will be here around Wednesday or Thursday.

The wind around here has been terrible for a long time, always too windy for my current fleet of planes (mostly smaller sizes like the PA Ultimate AMR). Getting something this size will hopefully allow me to fly more !!
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