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emir_82

Well-Known Member
Joined
Jun 25, 2014
Messages
54
Location
Rosario
Depending on the application. But for anything bigger than a Cri Cri I would recommend the emrax motor. They have a lot of options and with power to spare, they also give you a list of controllers that work well. At least until I finish my own motors and start to sell them I firmly recommend those.

Edit:
Do not go with MGM compro. The take forever to answer an email, even for buying stuff. If you already bought something, after sale is a true nightmare. I have a 7 months delay in my project because the controller came with a flaw and we had to send it to the factory. Of those 7, one month was trying to contact them because they never answer e mails or return calls. I am not exaggerating, I called more than 50 times in the later months to have answers. Also, I am not the only one with problems like these.
They may have all the hype in the friedrichshafen, but they treat the clients like garbage.
 
Last edited:

BBerson

Light Plane Philosopher
HBA Supporter
Joined
Dec 16, 2007
Messages
13,584
Location
Port Townsend WA
Some are buying wrecked electric motorcycles and stripping out the whole electric system (motor, controller, gauges,battery, charger, etc.)
Might be something similar with an electric bicycle.
 

Armilite

Well-Known Member
Joined
Sep 5, 2011
Messages
3,318
Location
AMES, IA USA
Electric Motor's and Controllers are not the problems, their available in 20-75+hp, it's the Batteries Cost vs Weight vs Flight Time, vs Recharge Time. People aren't Buying a Part 103 Ultralight with a 50hp Hirth, like the Phienox 103 at around $15,500 or the Aerolight with a Smaller Engine. Most Part 103's can fly 1-2hrs on 5 Gallons depending on Engine and Speed used. Most Part 103 Airframes fall into the 170-180lb Range, so 74-84lbs Max for Electric Setup. Even if you Build your own Battery Packs there still very expensive, like $4000+ea and you need at least (2) Battery Packs for say 1:15min of Flight, with just a 25hp Engine that Cruises at 20-22hp. That's WHY they're wanting $40,000+ for the Electric Lazair and Electric Spyder. To get the 18650 Battery Price down, you would have to Buy 20,000 Cells at a time Direct from China, then $1 each, at Radio Shack they were $5 each. The Green 18650 3.2v Cells are used the most in these different Battery packs. Belite was using the Bigger Blue Hedway 40152's I think before they stopped working on Electric. I would use the Red Hedway 38120's myself. These Lithium's, also have to be replaced in about 7-8 years also. Try Selling your Plane when it needs $8000+ of New Batteries. Same for them Electric Cars. I like the Principle but just isn't Cost Effective yet.
 

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Armilite

Well-Known Member
Joined
Sep 5, 2011
Messages
3,318
Location
AMES, IA USA
e-Lazair:
https://www.rcgroups.com/forums/showthread.php?1412424-100-scale-Electric-Lazair

Here is what I have chosen so far:

Two 10 kw Turnigy CA120-70 motors with 32-12 props reconfigured to WYE terminations.

Two JetiSpin OPTO 300 controllers.

96 pieces of Zippy 5000 mah cells arranged in 6 packs of 16s4p each.

Six of FMAdirect PL8 v2 chargers, each one running off two 12v 900 watt Dell Poweredge 6650 power supplies wired in series to get 1800w at 24v.

Testing so far shows that I can expect to have close to 2 hours endurance (turned out to be 1 hr 20 min, so much for tests) with this 'legal' ultralight setup and then be able to recharge the batteries in about 1 hr (turned out to be 1 hr 15 min, not too bad a guess).

e-Spider:

I don't think either got put into Production yet.e-Lazair Test.jpg e-Lazair Stats.jpg e-Lazair.jpg Flightstar e-Spyder.jpg
 

Armilite

Well-Known Member
Joined
Sep 5, 2011
Messages
3,318
Location
AMES, IA USA
I watched the eLazair fly at Oshkosh. He had two Honda generators to charge it. (could just yank the Honda engines out and fly with that:cool:)
=========================================
Yes, I agree, Honda/Clone Engines would be much Cheaper. Predator 212cc was just on Sale from Harbor Freight $99.95, normally $119.99. With Mods 13hp to 15hp.
 

Tiger Tim

Well-Known Member
Joined
Apr 26, 2013
Messages
3,312
Location
Thunder Bay
I watched the eLazair fly at Oshkosh. He had two Honda generators to charge it. (could just yank the Honda engines out and fly with that:cool:)
It’s usually pretty sunny for most of Oshkosh, I wonder how many square feet of solar panels you’d need around where it’s parked to be all charged up to fly each evening?
 

BBerson

Light Plane Philosopher
HBA Supporter
Joined
Dec 16, 2007
Messages
13,584
Location
Port Townsend WA
I don't know his power load, but if a 20 kW/hr flight he would need about 200 of the 100watt panels to charge in one hour or 50 panels with four hours of bright sun, is my quick estimate.
He wanted to fly across America. Haven't heard anything.
 

GeneG

Well-Known Member
Joined
Jul 5, 2019
Messages
74
Location
Arkansas
I don't know his power load, but if a 20 kW/hr flight he would need about 200 of the 100watt panels to charge in one hour or 50 panels with four hours of bright sun, is my quick estimate.
He wanted to fly across America. Haven't heard anything.
Or use fewer panels, store power in storage cells and dump it into the flight batteries like a Tesla charge station.
 

Bille Floyd

Well-Known Member
Joined
Sep 26, 2019
Messages
282
Depending on the application. But for anything bigger than a Cri Cri I would recommend the emrax motor. They have a lot of options and with power to spare, they also give you a list of controllers that work well. At least until I finish my own motors and start to sell them I firmly recommend those.

...
The low voltage Emrax-188 is an axial flux motor . Looking at the data chart ; does it
need to run at 3,000 rpm minimum, to be
most efficient ?

https://emrax.com/wp-content/uploads/2016/12/emrax_188_technical_data.pdf

15kw is more than enough to power my Rigid
wing HG ; but i want to have enough Hp
in the unit i buy , to self launch a HP-14 glider
off a grass airfield . Can the same motor be
use for both projects ?

Looking forward to what , "You" come up
with ,for a 30kw motor (emir_82) !!

Bille
 

emir_82

Well-Known Member
Joined
Jun 25, 2014
Messages
54
Location
Rosario
Yes,

You can use the emrax for both project. Look at the power vs rpm chart.
The power output increases with the motor speed. If you need more power you have to go to a smaller propeller running faster or make a reduction with belts and pulleys.

Next week I'll get the last materials to start the production of the prototypes.

Let's see hoy the work!

Regards
 
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