View Full Version : Apex V4 motor kit review

10-11-2005, 11:52 AM
OK im not on the payroll :D but i asked nicely and was given a kit to review and build,
as in the pix attached it comes nicely presented all magnets already fitted.the 20mm stator looks a nice design.

10-11-2005, 12:01 PM
the first trick to building this kit is to make a handle from a wooden dowel ,taper it so its a jam fit,the next is to wrap 4 turns of insulation tape hard up against the stator on the long side of the dowel,this insures that when you finally fit the stator onto the bearing tube, the cross over wires between the stator poles dont get jammed between the stator and the shoulder on the bearing tube/base.

10-11-2005, 12:10 PM
On to the wind the wire suplied was .3mm wich i increased to .35mm
and used the Y connected diaghram and wound 15 full turns ,my finishing turn always crosses over the start and i rotate the stator to the next post in that direction.

10-11-2005, 02:18 PM
Looking forward to some performance data :D

10-12-2005, 07:04 AM
after cutting the 3 central connecting wires down to 5mm long i scraped the insulation off about 3mm then twisted together soldered and fitted the small heatshrink,and bent it over into a posistion where it would not be fowled by the drum, then i cut down the main connection wires also to 5mm scraped and soldered 3 x 50mm lengths of silicon wire and fitted some heatshrink up as far as to touch the stator you will notice i fitted a larger size over the top of this again so the wires are side by side not all bunched up, now fit the wires through one of the holes in the backplate/ bearing tube and slide the stator into place,at this point i use some loctite 480 black max and put one drop on that half hole you can see on the inside edge of the stator hole,twist the stator slightly side to side then apply another drop and settle the stator into a nice posistion where the wires are not pressed hard up against one side and leave cure overnight.

10-13-2005, 11:43 AM
Final assembly, strip wire ends put heatshrink on wires then solder the male connectors that are supplied in the kit to the ends of the wires ,slide heatshrink up into posistion and shrink them,the front bearing was already installed I only had install the rear wich was a nice fit,take the shaft and fit the clip into the groove,slide the shaft into the rear bearing all the way,place the circlip end of the shaft on a firm surface and take the drum and evenly push it on and down all the way,rotate and check that there is no binding ,there is a fair amount of cogging wich is normal,if everything seems fine ,using the loctite i place 1 drop between the shaft and the drum hub and with a pin track it all the way around,yep overnight cure again,you got to have some patience;) ok when cured you can make your own test mount just make sure you have a clearance hole in the centre for the shaft.
In conclusion this was a very easy kit to build ,my choice of winding was to suit the lower c lipo's to power small lightweights and to suit a beginner, I know hotter winds will make this kit even more attractive to the experienced :D here is the results of the testing.
15 turns .35mm connected Y
no load 7.5v 13800 rpm 0.600ma = 1840 kv
GWShd 7035 7.5v 4.1 amps 10000 rpm =212g = 7.48oz thrust.

cheers Lez.

10-15-2005, 01:35 AM
Thats about US$ 24 for this kit BTW. http://static.rcgroups.com/forums/images/smilies/biggrin.gif

11-04-2005, 01:45 PM
I to am keen to see some testing results.
I just bought one from wattsuprc and am keen to see how other people are setting theres up.

11-06-2005, 05:58 AM
Im a little surprised that no one else has submitted some winds and test results.

11-06-2005, 10:18 AM
Hi olmod :)

I still haven't built the motor I bought for my son yet :o We built a simple profile bi-plane which I promtly flew into the nearest light pole on it's third flight and blew it into a thousand pieces......oooops :rolleyes:

Anyhow, I felt so bad, as he spent a heap of time building and finishing it I bought him a thunder tiger expo 3d as a replacement yesterday. They are a simple profile "extra" styled plane. This is where you come in hopefully!

It's 31.5" span, 252.3 sq.in and 9.3 oz, I assume this weight is with the "370" geared motor.

What sort of wind should I try for this plane? I have a 2 cell etec 1200 HP pack and 2 3S tanic 830 pack. He would like to do 3D with it (what 12 year old flyer nowdays dosen't!), so we want a heap of thrust of course!


11-06-2005, 02:46 PM
definately go with a heavier wire like .45mm or .5 mm it will help with efficiency;) if you can fit 18t on id give that a a try, and use hd7035 or 8040 prop, apc tho good in some sizes tend to be amp hungry in these sizes.

11-07-2005, 01:14 AM
Thanks Olmod. When you say HD, I can only seem to find the SF gws props.
I have some of those GWS 10*6 props that I think are HD?, I realize they are too big for this application, but are they the same shape as them ?

I have the .5, so I will use that. 18 turns? I'll definately need a stator holder like you use, the practice winds I did a while back were done holding the stator by hand, what a pain......

Actually are you interested in winding one of my spare stators for a fee? I don't know if it would be financially viable for both parties, just thought I'd ask. Your winding work is outstanding, mine looks like a short waiting to happen........ :o

I know it defeats the purpose of buying a DIY kit :rolleyes: , but if you would like to do one, or two stators if it is more worth your while, let me know.


11-07-2005, 05:40 AM
The gws hd are shaped like a traditional bread and butter knife, the slow fly's i dont use for direct drive i consider them dangerous over time as they develop fatigue lines when used for direct drive at high rpms. i buy mine in from the states as not enough shops here have a good stock of all the sizes and you get a good deal on multiples buying them that way as shops here only sell singles.ill pm you as to winding. cheers Lez.:)

02-21-2006, 05:53 AM
I mated an earlier Apex300 (v2 ???) to the existing gearbox/prop combination that came with the Expo and although I'm only running a 2cell lipo (1050mah), hovers (temporarily) out of my hand. I'm pretty sure I wound it with .5 wire with 15 turns. Never gets hot and gives decent run times.

12-22-2006, 05:34 AM
This might be an old thread but I am trying to work out what wind would give me around 1300Kv with this motor.
Any Ideas.

12-22-2006, 09:20 AM
I would be guessing around 20 turns,its been a while since ive seen any data,but someone may have done one. merry xmas :)

12-23-2006, 07:29 AM
Thanks Les.
I plan to use this second DIY 300 I have to fly a 3mm depron 3d foamy (home built) Bipe on a 2 cell 800ma LiPo from wattsup and prop it so it's drawing around 9A at full power static.
I will let yas know how it went.
The price of ready built motors has pushed these DIY motor out of the market I guess.
Do you know of a 500 size DIY motor as I would like to wind one for my electric buggy.

12-23-2006, 08:43 PM
What kv n amps ?

12-24-2006, 11:43 PM
I am thinking around 4000-5000kv A's I'm not sure posibly up to 35A.
The output shaft need to be 1/8" as the pinions are this size.

12-25-2006, 03:07 AM
Wow winding your own motors to your specs. Thats way beyond my talants :p Hi everyone, If anyone would Know, You Guys should, this will be easy for you :) Can anyone tell me what size glow engine this motor would be equal to, I just bought it on e bay, I think it might be a 30 to 40 size glow, but I am Just not sure, Thank you in advance, Chellie
ps the ad said its rated at 1000watts

12-25-2006, 03:23 PM
Next time, better start a new thread Chellie.

Forget about a straight comparison between IC engines and electric motors. IC power is specced at high rpm's and as such are never used. IC power ratings differ to much from electric power ratings. Rules of thumb for electric power:
www.ezonemag.com (http://www.ezonemag.com)
-> FAQ -> 805 - What does the Watt-hours/pound rule tell me?
-> 806 - How do I match an electric power system to a given airframe?
-> 807 - How do I convert a gas powered plane to electric?

Vriendelijke groeten ;) Ron
diy motor building tips & tricks (http://www.rcgroups.com/forums/showthread.php?t=240993)
diy brushless motor discussion group (http://www.yahoogroups.com/group/lrk-torquemax)
Drive Calculator (http://www.yahoogroups.com/group/D-calc/) download & discussion group
int. E fly-in & diy outrunner meet (http://home.hetnet.nl/%7Eronvans/), Aug.26 2007, Nijmegen, the Netherlands

12-25-2006, 10:12 PM
Is there a 500 size DIY motor available

01-10-2007, 02:17 PM
Just as a matter of interest I wound a single wire 0.42mm twenty times around each pole.
Test on a 2cell lipo.
APC 9x4.7
5800 RPM

I am impressed

01-10-2007, 06:07 PM
Is there a 500 size DIY motor availableList of outrunner manufacturers, kits too:

Vriendelijke groeten ;) Ron
diy motor building tips & tricks (http://www.rcgroups.com/forums/showthread.php?t=240993)
diy brushless motor discussion group (http://www.yahoogroups.com/group/lrk-torquemax)
Drive Calculator (http://www.yahoogroups.com/group/D-calc/) download & discussion group
int. E fly-in & diy outrunner meet (http://home.hetnet.nl/~ronvans/), Aug.26 2007, Nijmegen, the Netherlands

01-10-2007, 10:28 PM
Thanks Ron.
Just what I needed.
BTW My family is from Holland . Wish my mum had tought me the dutch language.

01-11-2007, 05:54 PM
Maybe the new Scorpion motors?

Vriendelijke groeten ;) Ron