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Apr 12, 2011, 09:44 PM
high-speed freak
opualuan's Avatar
Thread OP
Discussion

Modern Mega DD equivalents


Time was, Mega 16/15/x series was THE inrunner to beat for price/performance. I feel old.

I'm looking to build a fast DD plane that would be great with the modern equivalent of the 16/15/4 motor (2300rpm/V, 2.7oz, 250-300W). Outrunners would be a pain for mounting in this project. Looking to run 3S on a 5-6" prop.

There are so many random brands out it's very difficult to pick one! It's a nice crunchie so I'm avoiding cheapies, but NEU is out of the price range. What is a reasonable match to the Mega on the current market?
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Apr 13, 2011, 04:33 AM
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Bruce Abbott's Avatar
Typhoon EDF 4W
Apr 13, 2011, 09:23 AM
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I was thinking maybe an Arc, but the closest thing I found is ~30g heavier. http://www.shop.chuckshobbies.com/pr...&categoryId=71

I would avoid the Ammo's, the shafts are too weak.

The leopard motors seem pretty nice if you can find one to your liking in the CONUS.

And the HETs do seem like some decent units.
Apr 13, 2011, 09:40 AM
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Mark Wood's Avatar
Neu. Available via Castle Creations.

*edit* Oops! Out of the price range per the OP.

mw
Last edited by Mark Wood; Apr 13, 2011 at 05:14 PM.
Apr 13, 2011, 10:53 AM
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Dr Kiwi's Avatar
A 28-37-3 is only 77g:
Apr 13, 2011, 12:44 PM
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gotboostedvr6's Avatar
opualuan,


Its obvious the posters above are recommending motors they are comfortable with.

I will argue that no motor manufacturer on the market today that can produce a motor that is capable of outperforming a MEGA gram per gram. Testing has proven this to be true.

The "modern" equivalent of a 16/15/4 is a MEGA 16/15/3.5/SE in 3.2,4,or 5mm shaft. The lower turn count in combination with the more efficient magnets brings down the kv to match the 4 turn motor. The 3.5 turn motor also uses thicker wire reduceing the internal resistance which in turn increases the power potential and reduces the operation temp.

Options when ordering MEGAs :

16 stands for the diameter of the rotor, you may choose 16 for 28mm or 22 for 36mm diameter motors.

15 is the length of the rotor except for for 28mm motors with "e" designation which is +5mm; You may choose 7,15,17,20,25,30,35,40mm long rotors.

3.5 stands for the turns of wire, presently you may choose from 1-7 turns of wire with two choices of .5 between each whole number which is further explained below.

S stands for the lower kv style of wind, you may also choose "R" which is slightly higher kv and lower resistance

E stands for the efficiency magnets which on 16 series means +5mm on the rotor.

C stands for 5mm shaft; you may also choose 2.3mm, 3.2mm, 4mm and 5mm on 16 series motors.

100,000 rpm bearings are also an option

(2.3mm is a 3.2mm shaft internal turned down), (4mm is a 5mm shaft internal turned down).
Apr 13, 2011, 01:49 PM
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Mark Wood's Avatar
n/m. Didn't read the OP well enough.

mw
Last edited by Mark Wood; Apr 13, 2011 at 05:14 PM.
Apr 13, 2011, 02:23 PM
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gotboostedvr6's Avatar
In my travels i have collected a ton of data to form my conclusions. Both my testing and others.

To prove one way or another some testing is in order. Do you presently have any Nue motors that you have done testing on or could do some testing on? I have a decent amount of MEGA data and a handful of motors to get the testing done on. I could also possibly ask a friend or two to do some prop tests using ice. i know of a few people that have Nue motors aswell.

Maybe when you have a second you can pm me motors you have that are Neu and ill see if any of my MEGAs are close enough to get some data points.

I'll use a few different Castle ICE speed controls and a fluke meter to confirm voltages for my graphing. (ice voltage is always low for some reason) .

It would be nice to get some hard evidence to backup whatever the bottom line is.
Apr 13, 2011, 02:44 PM
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Bruce Abbott's Avatar
Quote:
Originally Posted by Mark Wood
Neu. Available via Castle Creations.
Too expensive?

Quote:
Originally Posted by Dr Kiwi
A 28-37-3 is only 77g:
Could be a good choice if you don't mind using a slightly smaller prop (to compensate for the higher Kv).

Quote:
Originally Posted by gotboostedvr6
The "modern" equivalent of a 16/15/4 is a MEGA 16/15/3.5/SE
Where do you get these from? (it doesn't seem to be listed on Mega's website, and Google only found your post!).
Apr 13, 2011, 08:42 PM
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Dr Kiwi's Avatar
Quote:
Originally Posted by Dr Kiwi
A 28-37-3 is only 77g:
Could be a good choice if you don't mind using a slightly smaller prop (to compensate for the higher Kv).


Well Bruce, I got as close as I could... until they produce a 28-37-3.5 that's as close as I can get! The /3 will run a 5" or 6" prop reasonably close to the 250-300W requirements.
Apr 13, 2011, 09:36 PM
high-speed freak
opualuan's Avatar
Thread OP
guys, I appreciate all the input! This will be for a twin, so 2x $100+ motors is too much for my project. I'm sure NEU makes some great motors, but I'll have to carefully pick which project I run with a NEU.

Between the unpredictable $15 bargain models the delta-foamie guys hunt for and the NEU 1105/1107 ($109-$119) exists a middle ground I'm looking for- say around $50, hopefully with good vendor support in the US.

Due to the economy/US dollar I doubt 16/15/x MEGA can be had for a reasonable price any longer. No?

ARC is sounding like a good match. Anyone ever have a bad experience with them?
Apr 13, 2011, 09:51 PM
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Mark Wood's Avatar
What wind Neu would you be considering?

mw
Apr 13, 2011, 10:31 PM
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gotboostedvr6's Avatar
Mark,

Is your question directed at me?

-Dave
Apr 13, 2011, 10:35 PM
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gotboostedvr6's Avatar
opualuan,

HET is your best bet if you want something low dollar that is worth investing in.

-Dave
Apr 14, 2011, 12:30 AM
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Mark Wood's Avatar
Quote:
Originally Posted by gotboostedvr6
Mark,

Is your question directed at me?

-Dave
No. Sorry. I should have used the quote. I have a pair of 1107/2y motors that might work for him without having to pay full boat. I was going to use them in a twin edf but I have a pair of 1110/1.5y motors for that instead if I ever get that far.

Omar's got a very cool project going where small props like APC 5x3 Sports would work nicely at ~25.5 amps each on 3s.

mw


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