Leopard vs HK 3674's

[siberianhusky]

Over on RCU someone has taken apart a pair of 3674's for comparison, by pictures they are not the same motor. Stators are completely different.
He them did some pulls with air props I guess, he compared a leopard, the HK and a stock genesis motor.
The HK motor had the highest amp draw out the 3, but there were no rpm or torque numbers so it may have put out more power.
The stock genesis motor was just slightly behind the leopard in terms of amp draw.
Not my work or findings, not sure what he used to get the values and some important data is missing.
Thought I'd post this as he does have pictures of the two taken apart.

http://www.rcuniverse.com/forum/m_10994002/tm.htm

How big a difference does a slotted stator make vs a non slotted stator? I was under the assumption that with modern magnets and manufacturing there wasn't much of a difference anymore.

[Snowride]

That whole darn shootout was just plain silly. One used motor, one new motor. One being 1650kv the other 2200kv. Assuming a slotted design is better? Not really and on the contrary, read this. http://www.servo2go.com/support/file...TECHNOLOGY.pdf

It would have had some merit if the 2 were new and of the same kv.

[martin]

This has been the big question for some time is the HK Turnigy motors the same motors inside as the Leopards. The thing that i questioned was HK Turnigy motors that had the same numbers ie model numbers & kv as the Leopards had a much lower max voltage than the equivalent Leopard.

[siberianhusky]

Who care about his " motor test" never claimed it had any validity, the pics of the motors were the interesting part. Don't think the construction of the stator will change once a motor is run! Very well might with the difference in KV though.
Anyway. First time I've seen ANYBODY post pics of the two side by side taken apart. Heard lots of guesses educated and not as to if they are the same motor.
Still waiting for someone here to take apart a pair that are the same KV and put an end to the debate. Talk is cheap, at least that guy tried to figure it out!

[martin]

This would explain why the Turnigy motors are so cheap compared with the Leopards (i had herd that Leopard dealers couldnt buy Leopards for the price HK were selling the Turnigys for). With no slotted stator they are probably much cheaper to produce. I was thinking of trying one of the HK ones hoping they were the same motor inside but ill stick with the Leopards.

[Snowride]

Hmmm, productions runs and line changes happen all the time. This does not mean what you see is what you get. Here are pics of my Turnigy 4082 1600kv delivered within the last month. If somebody with a Leopard 4082 1600 can do the same we can see the differences. It has a slotted stator if that is what you are looking for. The same leopard goes for $110 the Turnigy goes for $50. There are likely subtle differences such as bearings and maybe magnet quality. The Turnigy uses CZ&TJ brand bearings which is some unheard of outfit in China but does not mean they are not very good quality. Casing and fitment are fantastic quality.

[dana]

I own all leopard now, but I did at one point buy a green tacon, which lasted about 5 runs then broke. I'm curious about these hk motors, because I am looking for motors for some budget builds I'm doing. Def interested in quality. My leopards have been good to me....

[Snowride]

I own all leopard now, but I did at one point buy a green tacon, which lasted about 5 runs then broke. I'm curious about these hk motors, because I am looking for motors for some budget builds I'm doing. Def interested in quality. My leopards have been good to me....

I used an orange Tacon 1700kv all summer long in my Spartan which ran long and hard without a hitch. Like this one. http://www.hobbypartz.com/96m812-3674-1700kv.html

[dana]

Yes I was informed later that the orange tacons are closer to leopard than the green ones. Not sure why. Plenty of guys on here use the green ones with no problem, maybe I just got a lemon. The stator blew apart on mine

[martin]

The stator & rotor in that 4082 look the same as my Leopard 4074, the bearings in my 4074 are NSK made in Indonesia. Maybe just cheaper bearings in some of the Turnigy models.

[Snowride]

Problem is, what bearing is best? Single seal, double seal, no seal, stainless, ceramic? If you like or think NSK is better, then pop a couple in. They are rather cheap and certainly are no where near the price differance. http://www.ebay.com/sch/i.html?_from...All-Categories. Personally I think you should have a few in the tool box just in case no matter what brand motor you choose. I like to take my motors apart every so often and clean them up and also spray a little jigaloo in them to keep things lubed and water resistant. What is jigaloo? http://www.jigaloo.com/ca/e_products_jigaloo.php

[siberianhusky]

I guess we have to readjust our ideas of marketing, try to adopt the chinese mentality.
To me it makes no sense for the manufacturer to sell a motor that has developed a reputation for quality, then turn around and sell the same motor under a bunch of different names for up half the price.
To me it's the same as GM selling a 'vette as a Geo for half the price for the same car, go figure which people would buy.
Either we're paying a huge markup for the leopard name or there is some difference we're missing aside from bearings, Quality of copper? Are the magnets the same? Cheaper grade of materials for stator and shaft?
I traded my leopard 4074 for a Motley Crew before running it, a couple of us are going to be running the 3665 2100kv HK motor in JAE riggers this summer. Have to see what's inside when I get it.
I'll have the Eagletree hooked up to it so I'll get some data when things thaw.

[jkr]

Over on RCU someone has taken apart a pair of 3674's for comparison, by pictures they are not the same motor. Stators are completely different.
He them did some pulls with air props I guess, he compared a leopard, the HK and a stock genesis motor.
The HK motor had the highest amp draw out the 3, but there were no rpm or torque numbers so it may have put out more power.
The stock genesis motor was just slightly behind the leopard in terms of amp draw.
Not my work or findings, not sure what he used to get the values and some important data is missing.
Thought I'd post this as he does have pictures of the two taken apart.

http://www.rcuniverse.com/forum/m_10994002/tm.htm

How big a difference does a slotted stator make vs a non slotted stator? I was under the assumption that with modern magnets and manufacturing there wasn't much of a difference anymore.

The Turnigy except the dif kv is a 2 pol motor.

[jkr]

Problem is, what bearing is best? Single seal, double seal, no seal, stainless, ceramic? If you like or think NSK is better, then pop a couple in. They are rather cheap and certainly are no where near the price differance. http://www.ebay.com/sch/i.html?_from...All-Categories. Personally I think you should have a few in the tool box just in case no matter what brand motor you choose. I like to take my motors apart every so often and clean them up and also spray a little jigaloo in them to keep things lubed and water resistant. What is jigaloo? http://www.jigaloo.com/ca/e_products_jigaloo.php

When i buy a Leopard the first thing i do is to put a pair ceramic bearings.
They are wear resist and high rpm.

[jamespl]

I have run the 4074 2000kv in my genesis on 4s since dec and it runs a dream. With a x645 prop it doesn't even get warm after a 5-6min run and that's with the timing at 15deg. I can't say if they are as good as the leopards but for the price I will deffo be using them again.