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May 05, 2017, 09:34 AM
1st Cavalry Division
Thread OP
Help!

LX P-40 Help Needed


Good Morning All;

I got ahold of a large P-40 about a week ago that needed some work. After some rather creative research, pretty sure it's a Langxiang LXP40. What I cannot find is a diagram or manual that explains the plugs and sequence. If anyone has one, or knows where to "get" one, I really could use the help there. Already burned up the ESC on it plugging in what I thought was the throttle control off the BEC. Thankfully I have another one but don't feel like cooking that one as well. I'll see if I can get a few pictures up here in a few if I can.
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May 05, 2017, 10:17 AM
Kamikaze Ace
Glacier Girl's Avatar
Might try down in the WarBirds section of the forum, there are a couple different threads on the larger P-40's there.
May 05, 2017, 10:29 AM
IMO ( In My Opinion ) →
balsa or carbon's Avatar
Quote:
Originally Posted by 1stCavArmyVet
Already burned up the ESC on it plugging in what I thought was the throttle control off the BEC.
Do you want to know how to plug everything into your receiver ? Which transmitter/receiver do you have ?

Can you explain in more detail what exactly you plugged into what ? Is this a brushless motor/ESC set up ?

A brushless motor ESC with a built in BEC has three sets of wires coming off it . 1 ) A set of two ( red and black ) that plug into the flight pack battery . 2 ) A set of three that connect to the motor's three wires . 3 ) a set of three ( usually red/white/black , or red/brown/yellow ) , with a black plug attached that plugs into the receiver . All electrical connections should be insulated .

The only thing that can burn up the ESC is the wrong battery , the battery plugged in with the polarity reversed , or a motor/prop that draw more amps than the ESC can deliver .
May 05, 2017, 01:16 PM
IMO ( In My Opinion ) →
balsa or carbon's Avatar
Here is what I use to power a 6v receiver , to bind the 6v receiver and set up the 6v servos/retracts/etc on a new plane . This way the ESC/BEC , flight pack battery and motor/prop are not involved ( no danger of accidentally spinning up the prop ) .

https://hobbyking.com/en_us/4-x-aa-b...___store=en_us
Last edited by balsa or carbon; May 05, 2017 at 01:21 PM.
May 06, 2017, 10:10 AM
1st Cavalry Division
Thread OP
There are so many plugs on it that it's almost confusing. I am going to try to get it together enough to get some pics of it today. There is a plug for the rear gear doors, rear gear, LED's, etc etc. Layout is like this....Motor>ESC>BEC?>Small Black Circuit Board> then to a servo plug that is unlabeled. When I first got some of it hooked up, it worked good. I plugged the servo plug into the receiver and fried the ESC so not sure what that is supposed to go to now. Thought it was for the throttle. I thought it was a Shenzhen Lanxiang model but they don't think it is.
May 06, 2017, 10:37 AM
Suspended Account
Well BH still sells the plane
http://www.bananahobby.com/8-ch-blit...html#navImages
May 06, 2017, 12:03 PM
IMO ( In My Opinion ) →
balsa or carbon's Avatar
Quote:
Originally Posted by 1stCavArmyVet
There are so many plugs on it that it's almost confusing. I am going to try to get it together enough to get some pics of it today. There is a plug for the rear gear doors, rear gear, LED's, etc etc. Layout is like this....Motor>ESC>BEC?>Small Black Circuit Board> then to a servo plug that is unlabeled. When I first got some of it hooked up, it worked good. I plugged the servo plug into the receiver and fried the ESC so not sure what that is supposed to go to now. Thought it was for the throttle. I thought it was a Shenzhen Lanxiang model but they don't think it is.
Post some close up detailed pics of everything and I'll try to help .
May 14, 2017, 06:42 AM
1st Cavalry Division
Thread OP
Finally got enough free time to get a few pictures. I'm not big on electrics as I never owned any until a few months ago when I got back into the hobby. I really want to get this girl back in the air, but don't want to mess it up by plugging the wrong stuff in so any help getting an ID on this plane so I can find a manual would be a MASSIVE help.
May 14, 2017, 01:44 PM
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balsa or carbon's Avatar
Quote:
Originally Posted by 1stCavArmyVet
Finally got enough free time to get a few pictures. I'm not big on electrics as I never owned any until a few months ago when I got back into the hobby. I really want to get this girl back in the air, but don't want to mess it up by plugging the wrong stuff in so any help getting an ID on this plane so I can find a manual would be a MASSIVE help.
I can't help you with ID-ing the plane or finding a manual , but I can try to help you getting it all wired up . I recommend getting a receiver battery like I linked in post #4 , that will eliminate the risk of burning things up with your flight pack battery . If you don't want to order one from HobbyKing , you can buy a 4 x AA battery holder at RadioShack ; you'll have to solder or crimp small female connectors ( that will fit onto the male pins on your receiver ) to the red and black wires on the battery holder . Bring your receiver along to RadioShack to be sure to get the right female connector size .

In photo #5 , I see two thick ( red and black ) wires coming off the bottom ( I assume they go to the flight pack battery ) . I can't really see what is coming off the top - is it just a lead that goes to your receiver ? If so , that is an external BEC ( NOT an ESC ) for powering your receiver/servos/accessories .

There should be three wires coming off your motor ( assuming it's brushless ) - what are they attached to ?
Last edited by balsa or carbon; May 14, 2017 at 03:06 PM.
May 14, 2017, 03:16 PM
1st Cavalry Division
Thread OP
The ESC was fried so I am putting a new 50amp in it. Those are the wires seen going into the nose of the aircraft. I had it working good until I plugged that servo wire into the RX that comes off the BEC. Thought it was for the throttle control. Guess not. Soon as I plugged it in, the ESC cooked.
May 14, 2017, 04:57 PM
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balsa or carbon's Avatar
Quote:
Originally Posted by 1stCavArmyVet
The ESC was fried so I am putting a new 50amp in it. Those are the wires seen going into the nose of the aircraft. I had it working good until I plugged that servo wire into the RX that comes off the BEC. Thought it was for the throttle control. Guess not. Soon as I plugged it in, the ESC cooked.
I'm confused about what you believe is your ESC and BEC .

What do you believe that thing is you're holding in photo #5 ? From what I can see in that photo - I don't think that is an ESC , it only has TWO sets of wires coming off of it , so I think it's an external BEC ..... that is NOT for throttle control . If it was an ESC , it would have THREE sets of wires coming off of it - a set of two thick wires ( red and black ) that go to your flight pack battery , a set of three wires that go to your brushless motor , and a set of three SMALL wires ( that looks like a servo lead ) that go to your receiver's throttle channel .

" I had it working good " . In what manner was it working good before you plugged it into the receiver ? A brushless motor ESC will not work at all without being plugged into a receiver and getting a signal from that receiver . If you just plug the flight pack battery into an ESC that is not getting a signal from a receiver , the ESC ( and motor ) will just make some beeping sounds , but will not spin up the motor .
May 14, 2017, 06:00 PM
1st Cavalry Division
Thread OP
The ESC is in the front. The item I have in my hand is the BEC. I had it plugged in (those that were labeled) to the RX and had the surfaces and motor working. There was one plug that I was confused about (4th picture) and plugged it in to test it. That is when the ESC fried.
May 14, 2017, 06:58 PM
IMO ( In My Opinion ) →
balsa or carbon's Avatar
Quote:
Originally Posted by 1stCavArmyVet
The ESC is in the front. The item I have in my hand is the BEC. I had it plugged in (those that were labeled) to the RX and had the surfaces and motor working. There was one plug that I was confused about (4th picture) and plugged it in to test it. That is when the ESC fried.
Can you trace the 4th picture mystery wire to see what it goes to ? The ONLY lead that should be plugged into the throttle channel on the receiver is the one coming off the ESC .

To test any of those other small(3)wires with the small black plugs , I would use a 6v receiver battery ( like the ones I've linked ) . That way you're not using your higher voltage flight pack battery ( 3S or 4S ? ) which is the only battery capable of frying things . After all the control surfaces , retracts , LED's , etc. ( that operate on the 6v receiver battery ) are working properly ..... THEN connect the ESC's small(3)wire lead to the receiver's throttle channel , and the ESC's thick red and black wires to the flight pack battery .
May 14, 2017, 07:23 PM
1st Cavalry Division
Thread OP
I think I'll try to do a video showing the entire setup. May be easier to do. I will try the lower voltage battery pack I have. It's about the same setup, just with a plug already on it
May 14, 2017, 07:46 PM
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balsa or carbon's Avatar
Quote:
Originally Posted by 1stCavArmyVet
I think I'll try to do a video showing the entire setup. May be easier to do. I will try the lower voltage battery pack I have. It's about the same setup, just with a plug already on it
What's the voltage of that battery pack ? Most receivers and servos are 5v or 6v max .


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