RE: Falcon 40 (Exceed heli) Forum  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       

All Forums >> RC Helicopters >> Electric RC Helis >> RE: Falcon 40 (Exceed heli) Forum
Page: <<   < prev  237 238 [239] 240 241 242 243 244 245 246   next >   >>  

Login
Message << Older Topic   Newer Topic >>
RE: Falcon 40 (Exceed heli) Forum - 5/22/2008 5:56:40 PM   
dknovick



Posts: 710
Joined: 1/19/2005
From: Albuquerque, NM, USA
Status: offline
quote:

ORIGINAL: stalledout

No real luck, possibly some improvement, but not much. One question I have, do you keep turning the pot/screw, complete multiple revolutions, or is it more like a clock face, with different settings based on whether you are pointing to 1,2,3,4,5,6,7,8,9,10,11 or 12 o'clock? To me, it seems like the latter. Any help clarifying or other suggestions would be appreciated.

The pot is suppose to adjust the tail motor. I'm currently in the process of figuring out what it actually does (see above posts).

The pot is a single turn without any stops, so it will go round-an-round. On my pot, I noticed there's a large dead band around the point where it "flips" (goes from 0V to 3.3V). If you're near there, you can turn it 1/8 of a turn without and change.


_____________________________

What goes up, most come down. How hard depends on you!

(in reply to stalledout)
       Post #: 5951

RE: Falcon 40 (Exceed heli) Forum - 5/22/2008 5:57:08 PM   
broggyr



Posts: 603
Joined: 1/22/2007
From: Naugatuck, CT, USA
Status: offline
quote:

ORIGINAL: dknovick

The controller *does* add more yaw thrust for increased main throttle. With my heli sitting on the bench and the main motor unplugged, as I increase the throttle, the tail increases as well. I'm holding the heli steady, so there's no gyro input. So the controller must add tail thrust proportional to the main motor.


I agree with this as well, from a practical standpoint. As previously noted, when I [used to] apply throttle, the tail would ramp up as well, then though there wasn't any movement in the heli. There's gotta be some kind of mixer in there.

On my current heli, the main motor/esc is entirely separate from the tail motor/esc, the only common point being the Rx. I can control my tail motor from 0 rev to full power completely independently from the main, something I could not do with the OEM 4-in-1.


_____________________________

irony [ay-ruh-nee, ay-er-nee] adj.:
Like goldy or bronzy, except made of iron

(in reply to dknovick)
       Post #: 5952

RE: Falcon 40 (Exceed heli) Forum - 5/22/2008 5:58:22 PM   
dknovick



Posts: 710
Joined: 1/19/2005
From: Albuquerque, NM, USA
Status: offline
quote:

ORIGINAL: helojerry

Normally, diodes are used to protect drive transistors from inductive kick on devices that contain coils like relays, motors, and solenoids. When current flow thru an inductor is suddenly interrupted, a large voltage spike can be generated. That would be my best guess.


Correct! To add a little more, it's called a flyback diode.


_____________________________

What goes up, most come down. How hard depends on you!

(in reply to helojerry)
       Post #: 5953

RE: Falcon 40 (Exceed heli) Forum - 5/22/2008 6:02:10 PM   
helojerry


 

Posts: 73
Joined: 4/17/2008
From: Phoenix, AZ, USA
Status: offline
quote:

ORIGINAL: helojerry


quote:


Can anyone tell me what the diode is for. Am i damaging anything?


Normally, diodes are used to protect drive transistors from inductive kick on devices that contain coils like relays, motors, and solenoids. When current flow thru an inductor is suddenly interrupted, a large voltage spike can be generated. That would be my best guess. It is there to protect the output MOSFET in the 4 in 1. You are probably fine if things are still working OK. It is probably a good idea to add the diode if you can. The exact specs are not critical. It just needs to be a rectifier type diode that can handle a reasonable amount of current like 1 amp or more. I think Dave listed a part number in an earlier post. Just be sure to install it in the correct direction the cathode should go to the positive motor terminal. The cathode is marked with a white or black stripe depending on the color of the diode body.

Hope that helps.

Jerry


Sorry. I blew that. The diode is a 28v zener, not a simple rectifier diode. The inductive kick is going to be a positive voltage, so a simple diode won't do it. All of the previous comments still apply. The part number Dave listed was 1N5871. The zener voltage needs to be a few volts higher than the maximum battery voltage.

Jerry


(in reply to helojerry)
       Post #: 5954

RE: Falcon 40 (Exceed heli) Forum - 5/22/2008 6:13:13 PM   
dknovick



Posts: 710
Joined: 1/19/2005
From: Albuquerque, NM, USA
Status: offline
quote:

ORIGINAL: The_Seeker

Hey,

Thanks for the reply. With the century motor is it suggested that you add the diode in addition to the capacitor that is between the poles?


To be safe, I would. The diode is a 1N5819 (the part number a couple of pages back was wrong, it's fixed now). It's a 40V 1A Schottky diode. Anything in that range would be fine (make sure it's a Schottky!). I think I still have a few around, you can PM me your snail-mail, and I can send you one.

The original diode is a 1N5817 (dyslexia strikse agani ) !
20V 1A Schottky. I prefer a larger safety margin (40V vs. 20V)

-Dave

< Message edited by dknovick -- 5/22/2008 6:17:13 PM >

_____________________________

What goes up, most come down. How hard depends on you!

(in reply to The_Seeker)
       Post #: 5955

RE: Falcon 40 (Exceed heli) Forum - 5/22/2008 6:25:15 PM   
The_Seeker


 

Posts: 23
Joined: 3/10/2008
From: Atlanta, GA, USA
Status: offline
quote:

ORIGINAL: dknovick


quote:

ORIGINAL: The_Seeker

Hey,

Thanks for the reply. With the century motor is it suggested that you add the diode in addition to the capacitor that is between the poles?


To be safe, I would. The diode is a 1N5819 (the part number a couple of pages back was wrong, it's fixed now). It's a 40V 1A Schottky diode. Anything in that range would be fine (make sure it's a Schottky!). I think I still have a few around, you can PM me your snail-mail, and I can send you one.

-Dave



Dave the offer is much appreciated. I still have the diode from the stock motor sitting in my tool box it's just a matter of soldering the thing on. As always thanks to everyone who responded.

On another note thought I would suggest an upgrade for the Falcon. Found this a few weeks back. I didn't want to post it here until I had my bird setup with it. It rocks no more busted frames. The boom connector blows the one on the stock frame away. The frame includes the skids so no need to upgrade to the SuperSkids. If you go with this frame and subtract the costs of buying superskids separately I think it's an awesome deal. Stability is vastly improved I've noticed a significant decrease in vibration. As far as flying my bird is rock solid now. The only modification required is a shorter servo arm for one of the servo's. I picked up some z bend pliers and knocked that out no problem. I picked up this frame last week for $12 (it was on sale) but I didn't want to post it here have you guys buy it and it not work. Anyway it's at $19.75. If you plan on sticking with your Falcon 40 for a while or plan to keep your 40 in addition to other Heli's I would recommend picking up this frame and a set of Z bend pliers.

< Message edited by The_Seeker -- 5/22/2008 6:34:02 PM >

_____________________________

T_S

(in reply to dknovick)
       Post #: 5956

RE: Falcon 40 (Exceed heli) Forum - 5/22/2008 6:32:00 PM   
helojerry


 

Posts: 73
Joined: 4/17/2008
From: Phoenix, AZ, USA
Status: offline
quote:

ORIGINAL: dknovick

Correct! To add a little more, it's called a flyback diode.



Dave,

We had a guy earlier that was blowing MOSFETs left and right. Could it be that he lost his protection diode?

Jerry

(in reply to dknovick)
       Post #: 5957

RE: Falcon 40 (Exceed heli) Forum - 5/22/2008 7:00:47 PM   
dknovick



Posts: 710
Joined: 1/19/2005
From: Albuquerque, NM, USA
Status: offline
quote:

ORIGINAL: The_Seeker

Dave the offer is much appreciated. I still have the diode from the stock motor sitting in my tool box it's just a matter of soldering the thing on. As always thanks to everyone who responded.

No worries, just make sure you put it on correctly!


quote:

ORIGINAL: The_Seeker

On another note thought I would suggest an upgrade for the Falcon. Found this a few weeks back. I didn't want to post it here until I had my bird setup with it. It rocks no more busted frames.

That is a sweet frame! And I have z-bend pliers. However, my superskids are working for me. Next time a break a frame, I'll have to give this a try.


_____________________________

What goes up, most come down. How hard depends on you!

(in reply to The_Seeker)
       Post #: 5958

RE: Falcon 40 (Exceed heli) Forum - 5/22/2008 7:05:30 PM   
broggyr



Posts: 603
Joined: 1/22/2007
From: Naugatuck, CT, USA
Status: offline
quote:

ORIGINAL: helojerry
Dave,

We had a guy earlier that was blowing MOSFETs left and right. Could it be that he lost his protection diode?

Jerry


If I'm not mistaken, that was GAU-8


_____________________________

irony [ay-ruh-nee, ay-er-nee] adj.:
Like goldy or bronzy, except made of iron

(in reply to helojerry)
       Post #: 5959

RE: Falcon 40 (Exceed heli) Forum - 5/22/2008 7:07:21 PM   
dknovick



Posts: 710
Joined: 1/19/2005
From: Albuquerque, NM, USA
Status: offline
quote:

ORIGINAL: helojerry

Dave,

We had a guy earlier that was blowing MOSFETs left and right. Could it be that he lost his protection diode?

Jerry

Gau-8? He's probably lost a lot of other things... .
But I'm pretty sure he has the diode on the motor. It's a good question though. When he gets a on again, we can ask.


< Message edited by dknovick -- 5/22/2008 7:08:16 PM >

_____________________________

What goes up, most come down. How hard depends on you!

(in reply to helojerry)
       Post #: 5960

RE: Falcon 40 (Exceed heli) Forum - 5/22/2008 7:15:02 PM