RE: 35% Electric Extra
JZRF6C: The motor wires are 8 gage, and are the ones that came with the motor, the others are 10 gage. The wires don't get warm during a run, but the runs haven't been long enough to really check it out. We are beginning to question exactly what motor this is, as there are no markings, logo, serial number or manufacturers identity anywhere on it. It may be a prototype or a knockoff, and not really capable of handling what we're feeding it. Thanks for your thoughts. Ray
Posted on: 9/2/2012 12:09 PM by Author "RAYGIB" in the forum "3D Electric Flying!"
http://www.rcuniverse.com/forum/fb.asp?m=11214631

RE: EVERYTHING YOU WANT TO KNOW ABOUT ELECTRIC FLIGHT
Thanks for reading my 'book'. I don't know what it is either.....so I'll post a pix in giant scale.
Posted on: 9/1/2012 8:13 PM by Author "RAYGIB" in the forum "Electric Training"
http://www.rcuniverse.com/forum/fb.asp?m=11214049

RE: EVERYTHING YOU WANT TO KNOW ABOUT ELECTRIC FLIGHT
Dear aeajr: Thank you for your reply to my inquiry. From someone authoring over 7000 posts I will certainly pay attention to what you post. However, I’d like to offer a few words in my defense. Living in rural Maine does not present the opportunity to experience much hands on education on big RC airplanes, particularly electric ones. No one in this area has seen a motor of this size, let alone run one, so we must experiment to some degree. As for my not knowing the pedigree that the motor, let me state that I purchased it at auction, and it came with no paperwork or instructions, and the motor itself has no markings whatsoever on it (see attached picture (I hope)), no logo, manufacturer, model or serial number. The price was right, so I purchased it and the seller stated that I might find some information on a Hacker webpage. Upon doing so, I came across a web page showing the Hacker A150-8. It certainly looked like the motor in my possession, the dimensions were identical. Consequently, I concluded the motor I had was a prototype of the A150, or a ‘knock-off’. A web page from Aero-Model had a list and description of all Hacker motors, including recommendations for the A150-8. This page showed the same model number for two motors, the difference being one operated on, apparently, two 6S Lipos in series at 42-44 volts and 155 amps (as you point out in your post) and the other on 7S in series for 48 volts and 188 amps. I chose to operate at the lower voltage and wired two Turnigy 6S 5000 mah LiPos in series to obtain the 42-44 volts. An identical set was wired in parallel with the first set to add flight time. A Turnigy 200 amp Monster ESC was purchased to complete the system. I did consult with a knowledgeable colleague living some distance away and described what I was doing and he had no concerns, saying it sounded OK to him. Of course, hindsight is better and I should have put an ammeter in series between the batteries and ESC and run some tests but none were available anywhere local so I had to order one, along with its external shunt. The motor responded during the initial turn on with the proper sounds, the recommended size Xoar 27 X 12 wood prop spun in the proper direction and all seemed well, I did not do a full power test prior to the first flight but did run it up quite a bit and there was plenty of power. You know the rest. When the ammeter arrived and was inserted I was quite surprised that the system was running at just over 200 amps at full throttle! You are probably correct in assessing that the ESC could be damaged. I have not tried to run things again until I can get a smaller prop to drop the amperage. What size would you recommend? Effort was made to keep things in their proper range, but with the recommended prop the current draw is too high. You are, of course, correct that 8000 watts at 44 volts is 181 amps. I was expecting the amperage to be around the recommended number of 150, and thought a 200 ESC would be plenty. I am aware the recommended ESC is a 220 amp one. Perhaps this undocumented motor has a problem. I’ve requested Aero-Model to examine and test it, and haven’t heard back from them at this point. Sorry I’m so long winded, but the details are important. Again, thanks for your thoughts and perhaps you could recommend a prop size.
Posted on: 9/1/2012 7:26 PM by Author "RAYGIB" in the forum "Electric Training"
http://www.rcuniverse.com/forum/fb.asp?m=11214003

RE: EVERYTHING YOU WANT TO KNOW ABOUT ELECTRIC FLIGHT

Posted on: 9/1/2012 7:14 PM by Author "RAYGIB" in the forum "Electric Training"
http://www.rcuniverse.com/forum/fb.asp?m=11213988

35% Electric Extra
Trying to fly a 35% Hangar 9 Extra 230 with electric power. Presently have what I believe to be a Hacker A-150 installed in this plane. Using Turnigy 200 amp ESC with four 5000 mah 6S Lipos in series parallel combination delivering 44.4 volts to ESC. Model flew once and experienced uncommanded motor shut down after less than a minute, landed dead stick. However, motor came back on to taxi aircraft back. Tried to fly again but motor would not stay running under full power, and sometimes under partial power, shutting down at 70 amps sometimes even when started cold. If power is brought in slowly the system will reach full power and may or may not stay running. When it shuts down, it seems to come right back with reduction of power to idle and then back up. Motor gets hot after a 20 second run. Spektrum DX8 transmitter with telemetry. Batteries furnish no less than 42v when delivering full power at slightly over 200 amps, so low voltage isn't the problem. Have a video of test runs of the motor in the plane, but it is 82 megabytes in size and takes forever to up and download. Anyone have any ideas as to what the problem may be?
Posted on: 9/1/2012 6:40 AM by Author "RAYGIB" in the forum "3D Electric Flying!"
http://www.rcuniverse.com/forum/fb.asp?m=11213438

RE: EVERYTHING YOU WANT TO KNOW ABOUT ELECTRIC FLIGHT
I need help! I've converted my Hangar 9 35% Extra 230 to electric power. The motor is believed to be a Hacker A150, which is rated at 8000 watts, 44.4v and 200 amps. I have a 200 amp Turnigy Monster ESC and 4 Turnigy 5000 mah 6S LiPos in a series parallel conbination delivering the 44.4+ volts and somewhat over 200 amps (measured with a 200 amp ammeter with a 75mv shunt). It flew once for under a minute before the power died and dead sticked in. However, power was there to taxi back. Holding the plane down for testing, with the ammeter in series between the batteries and ESC, the set up will pull just over 200 amps at full power, but only for 20 or 30 seconds before it shuts down uncommanded. The motor gets quite warm in that short time. Even when started from ambient temperatures sometimes the motor will drop off line at only 70 amps when the power is coming up. The voltage from the 4 LiPos never drops below 42 volts, even under full power, so low voltage would appear to not be the problem, although anythings possible. If the power is brought up very slowly, full power may be attained, but it usually doesn't last more than 30 seconds. Anyone any ideas on how to fix this short of putting the DA 100 back in?
Posted on: 8/31/2012 6:44 PM by Author "RAYGIB" in the forum "Electric Training"
http://www.rcuniverse.com/forum/fb.asp?m=11213098