Z20 980 vs Gaui 890 KV

[mjdee14]

I now have several flights with the Z20 980 KV. on Eagletree v3

I'm running stock gears with a 14t pinion...i have both 2500 and 3300 Polyquest 25c lipo.

The Gaui as everyone knows runs HOT...Z20 cool as a cucumber, the fan works great.

Gaui Hovering amps....20 -23...Z20 16 - 18...
Gaui 2500mah 6 mins 2000 back in 3300mah 8 - 81/2 and roughly 2400 back in, might have flown a little longer than 8 kept landing to check mah used.

Z20...6 mins only 1600 used flew a few more minutes put back about 2000..so I may be able to get a good 8 minutes of FF, 8's, stall turns, etc. The 3300 went 8 to 10 minutes no problem.

I really need to write this all down and give a more acurate report, but I can definately see the Z20 is much easier on the lipos and stays cool.

It does seem to bog a little on hard climbs outs more than the Guai..

motor and head RPM's were pretty similar...about 22,000 motor and 1850 head.

I need to check with an optical to see how acurate those speeds are..

Bat temp went to about 110 deg with both...

I'll post more when I get more flight time, but overall I like the Z20...will try a 15t pinion at some time in the future.

Anyone else have any figures between these two motors....I can't wait to get some good air time, been too cold to spend any real time at the field..it's a quick fly and run.

[mlinder]

Thanks for this excellent information.

Is this the motor you have?

http://www.helidirect.com/product_reviews.php?cPath=44_386&op=list&sort=2a&&products_id=6027

mlinder

Once I figure out how to get eh proper CG with 3300mah batteries I'll have to get one these motors.

[bstock]

THANKS MJ!!!

Good Stuff!!!

Thanks for comparing the motors/ flight times on the 2 different packs!

I wish we had the same for the Z30 and the Gaui 1100kv 1500w. Regardless... I am sure the Z30 is more efficent.

Have been half seriously considering getting the Z30... but I hear Scorpion is coming out with a new motor that would fit... and I would like to try that also.

[worldofmaya]

It depends... if you need raw power take a Z30. If you need a lot of power but with less power consumption you might take a z20 with kV1700.
-Klaus

[lightbulbjim]

Thanks for the info on run times etc. I have a Z20 980 on mine, still have the Gaui motor sitting in the box unused :twisted:.

Just got some FP 3700mAh packs too, soon as I figure out how to get the thing balanced when they're mounted they should give me some good run times.

[Kepler]

My Z20 is still going strong after atleast 100 flights. Have gone up and down the gear range to get the setup that suits me best. 14 tooth is great for long flights but too soft in performance for me. I have now settled on a 16 tooth which still give me 7 minutes on 3700 mah packs. The motor does come down quite warm now though. Usually around the 135 deg F mark or about a 5 second hold of the motor can before it feels too hot to continue holding.

[mjdee14]

Thanks for this excellent information.

Is this the motor you have?

http://www.helidirect.com/product_reviews.php?cPath=44_386&op=list&sort=2a&&products_id=6027

mlinder

Once I figure out how to get eh proper CG with 3300mah batteries I'll have to get one these motors.

yes it is supposed to be the same motor under the Tonic name. I have the long tail and mine balance almost perfectly with the 3300. I move the bottom back almost to the gear frame and the top one back to the motor and it's close enough.

The 2500 balance right on. I also use separate pack for rx & servos and have that at the back of the frame.

I think I'm really going to like this motor for my style of flying.....good motors are just not supposed to get as hot as the Gaui and it puffed 18c packs...

The Z20 is MUCH easier on the batteries, at least according to the Eagletree data.

I'll post more info as I get it...

It really is fun coming home after flying...charging the lipos and downloading the Eagletree and watching the session....you can mentally see your hovering, turns, pitch pumps, by watching the amp draw and/or rpm change....it's some of the best money I have spent.....also nice to know your ESC is not being over taxed.

I don't think i ever went above 35 amps with the Z20 and while hovering the amps were real steady at 16 -18 but the Gaui would jump all over the place 18 - 22.

[ke6d]

The Z20 is MUCH easier on the batteries, at least according to the Eagletree data.

I'll post more info as I get it...

It really is fun coming home after flying...charging the lipos and downloading the Eagletree and watching the session....you can mentally see your hovering, turns, pitch pumps, by watching the amp draw and/or rpm change....it's some of the best money I have spent.....also nice to know your ESC is not being over taxed.

I don't think i ever went above 35 amps with the Z20 and while hovering the amps were real steady at 16 -18 but the Gaui would jump all over the place 18 - 22.

Why is Z20 easier on the battery comparing to other motors, said RCP H/18 1100Kv geared down to get the same headspeed? For example if the 980Kv Z20 on 15T pinion would have a 2346 headspeed on 6S, the H/18 1100 Kv on a 13T pinion would yield 2354 headspeed on 6S. If we fly both configurations at 90% on identical flying style on identical set of battery, would the amp draw be the same?

I am asking this because I too also hook up an Eagletree to my Hurricane from time to time to check out the power system performance. Today, I decide to hook it up, set the timer for 6:00min on a pair of FP3200 EVO30s, and see what the bird can do at 2200 headspeed. I did big loops, small loops, forward flips, backward flips, rolls, climb out very high follow by at least 3 rotation of tail stall turns and 3 100ft big loops.
The battery was sucked dry at the sound of 6 min timer alarm :(

When I downloaded the data back to my laptop, I was astonished to see that the 100ft loops was drawing 78A out of the pack and peaked my 1000W H/18 motor at 1500W (???) most of the maneuvers are around 50-60A. It was a good thing that I decided to go with a 75A ESC when I built this bird.

How can a 1000W rated motor suck out 1500W in certain maneuvers? Am I missing something?

Cheers,

Dan

[X30PILOT]

After flying my Hurricane for a year on the original Gaui silver 850 KV motor I decided it was time to put in something more efficient. I installed a RCP 35/18/11 1100KV, 1000 watt motor. The Hurricane flew great on this motor but what an amp hog!
On the Gaui motor I averaged 19 amps, the RCP averaged 30 amps. My Trex 600 only averages 33amps. I have just installed a Z-power 20-980. On the First flight I averaged only 16 amps. This motor looks very promising.


X-30

[mjdee14]

Why is Z20 easier on the battery comparing to other motors,
I am asking this because I too also hook up an Eagletree to my Hurricane from time to time to check out the power system performance.

The battery was sucked dry at the sound of 6 min timer alarm :(

When I downloaded the data back to my laptop, I was astonished to see that the 100ft loops was drawing 78A out of the pack and peaked my 1000W H/18 motor at 1500W (???) most of the maneuvers are around 50-60A. It was a good thing that I decided to go with a 75A ESC when I built this bird.

How can a 1000W rated motor suck out 1500W in certain maneuvers? Am I missing something?

Cheers,

Dan

Don't mistake what a motor is "rated" for vs what it "Can" draw. You put such a load on it that it Drew everything the batterieis would give. It's why Fuses blow when you put more draw than they are allowed to take.

The Gaui motors get "Extremley" hot....heat is an indication of lost power.and ineficiency..it's like how a wire heats up if you connect both ends to a powerful battery.

The Z20 is made more efficiently than the Gaui and both runs cooler..(no lost power) and draws less power.

You are also running a much faster headspeed...2200 vs my 1800. And amp draw goes up Exponentially.

I have not pushed this motor yet into loops or any really hard manuvers yet (darn we need spell check)...and will continue to monitor ti with the E Tree.

Would love to see any one elses data on the Z20 or any other motors.

[worldofmaya]

Hi!
You may take a look there -> http://www.rc-heli-fan.org/viewtopic.php?t=33153&postdays=0&postorder=asc&start=15
until
http://www.rc-heli-fan.org/viewtopic.php?t=33153&postdays=0&postorder=asc&start=105
Between Page 2 and 8 you'll find logs with different configuration. He tested different batteries, different motors and pinions. It's German but there should be no problem reading the logs...
-Klaus

[Cralis]

Can I just verify something before I go and order the Z20...

Am I right in saying that I can still use my stock ESC (75amp) that came with the EP550, with the Z20? No need to change ESC, right?

Also, am I correct in saying that I can still use my 2200 25C packs (times 2) with this engine? No need to change to an expensive 6S pack, right?? I wan to be able to use the same packs I use on the EP550, as I do on my Trex 450 (and soon to be, Trex 500)

[mjdee14]

Can I just verify something before I go and order the Z20...

Am I right in saying that I can still use my stock ESC (75amp) that came with the EP550, with the Z20? No need to change ESC, right?

Also, am I correct in saying that I can still use my 2200 25C packs (times 2) with this engine? No need to change to an expensive 6S pack, right?? I wan to be able to use the same packs I use on the EP550, as I do on my Trex 450 (and soon to be, Trex 500)

Cralis....

Yes & Yes....actually the Z20 draws less current than the stock Gaui 890 or 1100 motors and is "nicer" to the batteries....

you will actually be helping the batteries by using the Z20..

if your not into Hard 3D then he Z20 is a good choice, if you want Raw Power then the Z30 is a better choice, BUT you will most likely want bigger batteries.

[Cralis]

Thanks Mjdee. So I can still use 2 3cell packs?

Yes, I am thinking of getting 2 new 3200 packs, but for now, can I buzz about for maybe 5 minutes with 2100 packs and the Z20-980?

[mjdee14]

So I can still use 2 3cell packs?

but for now, can I buzz about for maybe 5 minutes with 2100 packs and the Z20-980?

YES

[erbrou]

YES

Thanks Mjdee. So I can still use 2 3cell packs?

Yes, I am thinking of getting 2 new 3200 packs, but for now, can I buzz about for maybe 5 minutes with 2100 packs and the Z20-980?I fly 6:30 min with 2x FP 2170 mAh evo25c, Z20-980 kv motor and carbon blades (sport flying, using 1700 mAh-80% rule)

[mjdee14]

I fly 6:30 min with 2x FP 2170 mAh evo25c, Z20-980 kv motor and carbon blades (sport flying, using 1700 mAh-80% rule)

What gearing are you using...the 14t or 15t? and are you using the stock Gaui gears?

That's pretty good time for just 1700 mah's


What is your set up?

[erbrou]

What gearing are you using...the 14t or 15t? and are you using the stock Gaui gears?

That's pretty good time for just 1700 mah's


What is your set up?I bought this Hurricane 550 kit: http://www.readyheli.com/204002_Hurricane_550_XES_PRO_SE_Helicopter_Combo_p/204002.htm. Set-up: Z20-980 kV motor, 14T pinion, stock "ok" gears, GY401/Futaba 9254, S9452 servos on cyclic, ESC phoenix-80 (Castle Creations), Dimension Engineering SportBEC, stock carbon blades. I am using a normal throttle curve of 0, 50, 80, 90, 100% at this time. Also, my driving belt is not very tight.

I am actually suprised myself by the flight time that I am able to get. I set my timer to 6:30, after the buzz, I take 15-20 sec to land and I usually put less than 1700 mAh into my packs.

[devious17]

I got a Z-Power 20 A motor on mine was wondering what is the difference between the Z Power 20 to the 20A model, anyone?

[bstock]

The Z20A is said to be a newer and slightly more efficent design. I first read of them (and have only seen them) at tppacks.com.

[mjdee14]

I got a Z-Power 20 A motor on mine was wondering what is the difference between the Z Power 20 to the 20A model, anyone?

From what i have read they are made with a different core material that allows it to be more efficient, but one of the distributors said that with normal flying you most likely would notice much difference. It really helps when your pushing the motor in the higher limits of it's range....it will run cooler, therfore more effiecently.

If you have an older version I would'nt worry about it. One person has both and said he really can't see much difference with his normal flying.