RE: Mx-400 purchase  
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RE: Mx-400 purchase - 7/25/2007 11:28:15 PM   
osterizer


 

Posts: 1544
Joined: 3/10/2007
From: Sykesville, MD, USA
Status: offline 		With the lock nuts on it, blades for the TRex will often interfere on the ends. The only ones I have used that don't are Helimax and MAH. That said, I don't usually need to trim much (for example, I took off less than .5mm with a Dremel on the last set of SAB blades I put on it).

(in reply to Orion1024)
       Post #: 251

RE: Mx-400 purchase - 7/26/2007 6:02:11 AM   
Orion1024



Posts: 1384
Joined: 5/27/2006
From: Bolingbrook, IL, USA
Status: offline 		Thanks for the info on the blades. I gave them a closer look today (and pics of various blades online) and I guessed this might be the situation with the blades. For the time being, I think I'm going to use the same 290mm woodies I run on the 36 and take a little off the ends. I also need to do this with these blades when I run them on the 36, as they hit the inside of the blade grip. It's a definite plus to be able to use the same parts on two different helis. Well, I'm happy to say I got the last mechanical problem with the MX400 fixed today! My main gear was essentially perfect, but the autorotation gear wobbled up and down pretty badly and was binding on the tail drive gear. So I took the autorotation gear out and soaked it in boiling water and bent it back straight. Everything is working silky-smooth now, however, I did notice there looks to be potential for binding in the head with combinations of too much pitch and cyclic, so I'm going to start out conservative on the pitch range. Hopefully the receiver I ordered will be here tomorrow so I can finally get to the good stuff!

(in reply to osterizer)
       Post #: 252

RE: Mx-400 purchase - 7/27/2007 3:18:28 AM   
Orion1024



Posts: 1384
Joined: 5/27/2006
From: Bolingbrook, IL, USA
Status: offline 		Just put the blades on for a few pics. Ooooh...Ahhhh! It's getting there.

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(in reply to Orion1024)
       Post #: 253

RE: Mx-400 purchase - 8/6/2007 10:26:22 PM   
Orion1024



Posts: 1384
Joined: 5/27/2006
From: Bolingbrook, IL, USA
Status: offline 		Well, I'm still in the process of getting the MX setup (3 weeks now) and have hit a few snags along the way that have delayed me. First problem was the ball in the swashplate sticking. I got it a lot better, but noticed the other day that it still wasn't completely smooth...so I broke down and ordered the aluminum swash. When I did a low RPM spin up I noticed that the plastic T hub was also wobbling, so I also ordered the alu T. I've also had the same plastic T problem with my 36, so I can't blame Heli-Max too much...but I won't be buying any more plastic T's! So, while waiting on parts I decided to try to fix the sloppy stock tail unit. I noticed the tail pitch wouldn't always return to neutral (quite often it was pretty far off) and found that the problem is due to the slider only having one bearing (and it is loose, no less). Since I already had parts for the 36 I decided to put a Walkera 36 tail on it. It's WAY better now...there's no slop, the slider moves slick as glass (due to the chromed 36 shaft), and there's oodles of tail pitch. To get the tail mechanically adjusted, I'll be moving the tail servo to the boom. Here's a few pics of the new tail and current setup...


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(in reply to Orion1024)
       Post #: 254

RE: Mx-400 purchase - 8/10/2007 12:34:36 AM   
jw637362



Posts: 456
Joined: 1/11/2004
From: Golden, CO, USA
Status: offline 		Okee Dokee - Well I am a total loss here and feel like an idiot. I have it all put together and plugged in. I go to hover it in the kitchen and the collective is backwards from the throttle.
IE: I give it more throttle and the pitch goes negative. Obviously I say to myself - reverse the servo to make it go Positive Pitch. Duh.
I now reversed the throttle as well and about damaged the heli again....... Put it back to normal now........
This is where I am really confused.
I have a 6 channel receiver. Hitec / electron.
1-
2-
3-
4-
5-
Batt / 6-
I have looked at my old photos and cannot get a good reference of what I had everything plugged into. Old reference material in this thread is no good as it is for an 7-8 channel receiver. I have the GY240 so it goes in the same slot as the rudder servo.

Can you give a guy a clue as I seem to have missed the last one.
Picture is prior install but cannot tell the collective / elevator / ailerons / cables apart.

Thanks a bunch,
Jeff





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(in reply to Orion1024)
       Post #: 255

RE: Mx-400 purchase - 8/10/2007 5:20:42 AM   
AirmanBob



Posts: 380
Joined: 6/14/2004
From: Emmett, ID, USA
Status: offline 		Assuming you are using a Futaba transmitter for heli's.

ch 1 Aileron Servo (it sits in the thingy that goes up and down.
ch2 Elevator
ch3 ESC
ch4 Gyro
ch5 Gyro adjust (if used)
ch6 Pitch (it makes the Ail servo go up and down)

ch1 rev
ch2 rev
ch3 rev
ch4 rev
ch5 nor
ch6 nor

Swash 1-S

Does that help ?

Bob

< Message edited by AirmanBob -- 8/10/2007 5:24:16 AM >

(in reply to jw637362)
       Post #: 256

RE: Mx-400 purchase - 8/10/2007 5:48:32 AM   
AirmanBob



Posts: 380
Joined: 6/14/2004
From: Emmett, ID, USA
Status: offline 		Also.... replace that Heli-Max ESC.

Get an ESC that can be programmed for at least the following:

No Brake
Soft Start
Timing........set the timing for the 6 pole Heli-Max motor to HIGH..
It makes a world of difference.

I use an UltraFly 25A ESC with a programming card that I got at
tower hobbies. It has a built in 2 amp Bec.

And remember....longer blades flex more (more boom strikes)
when you consider upgrading the blades. Longer blades means
bigger load on the motor also.

Just trying to be helpful...

Bob

(in reply to AirmanBob)
       Post #: 257

RE: Mx-400 purchase - 8/11/2007 3:32:31 AM   
jw637362



Posts: 456
Joined: 1/11/2004
From: Golden, CO, USA
Status: offline 		Airman Bob - thanks for the reply, I use an Airtronics radio. RD 6000 - I use the GY240 gyro so no seperate channel on that.
The speed control will be changed as well. I will replug the servos as you stated and give it another shot. Thanks again,
Will report when done, cross your fingers,
Jeff


(in reply to AirmanBob)
       Post #: 258

RE: Mx-400 purchase - 8/11/2007 4:16:50 AM   
AirmanBob



Posts: 380
Joined: 6/14/2004
From: Emmett, ID, USA
Status: offline 		Well okay...but, I'm not sure those setting will translate
to an Airtronics radio. Won't hurt to try them I guess
but take the main blades off first when you test it.

Bob

(in reply to jw637362)
       Post #: 259

RE: Mx-400 purchase - 8/11/2007 4:59:07 PM   
jw637362



Posts: 456
Joined: 1/11/2004
From: Golden, CO, USA
Status: offline 		Ok - well....I kept thinking the "elevator" was what made it go up and down rather than collective pitch. I had the servo's revered. Thinking planes again.... I had to go back through my thread and find where someone else had told me that as well.

Out to the Field

Thanks,
Jeff

(in reply to AirmanBob)
       Post #: 260

RE: Mx-400 purchase - 8/17/2007 4:03:35 AM   
hobby_man


 

Posts: 230
Joined: 1/13/2004
From: circle pines, MN, USA
Status: offline 		hey gang run time on a 2100 mah 20c 3s lipo,
maybe 5 minutes ad the battery is real hot, and I even puffed one.
I have a

mx400/ark
castle creations phoenix-25, high gov. 8 on the throttle response, the rest is factory setting
ARK motor
315mm blades

and this could be the problem, some really good sized traing gear

any ideas why I am going through the batteries, I have to run this maked out to lift the train gear

http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXM034&P=ML

(in reply to jw637362)
       Post #: 261

RE: Mx-400 purchase - 8/17/2007 4:24:44 AM   
osterizer


 

Posts: 1544
Joined: 3/10/2007
From: Sykesville, MD, USA
Status: offline 		What's the kV of the motor, power capacity, and what pinion? What blades? Have you checked the usual suspects-- driveline bearings, head binding, tail belt too tight, servo binding?

The Phoenix 25 is a really good ESC, but I'm surprised it hasn't flamed-- based on a 5 minute run time, you're pulling 25A if running the battery flat. The batteries should be able to take that load without damage, though.

(in reply to hobby_man)
       Post #: 262

RE: Mx-400 purchase - 8/18/2007 4:53:44 PM   
hobby_man


 

Posts: 230
Joined: 1/13/2004
From: circle pines, MN, USA
Status: offline
quote:

ORIGINAL: osterizer

What's the kV of the motor, power capacity, and what pinion? What blades? Have you checked the usual suspects-- driveline bearings, head binding, tail belt too tight, servo binding?

The Phoenix 25 is a really good ESC, but I'm surprised it hasn't flamed-- based on a 5 minute run time, you're pulling 25A if running the battery flat. The batteries should be able to take that load without damage, though.



I finally got the MX400 dialed in and it handles great, until I took the traing geat off. I got about 6 packs of real flight. NOW after about 2 minutes of run time the motor starts to osilate and the shust down.

I autorotate to the ground and then the motor starts and stops and (jerks) a few times and then nothing.

Did I fry the speed control (castle Phoenix-25 with an ARK motor) or is the motor fried? OR?????

(in reply to osterizer)
       Post #: 263

RE: Mx-400 purchase - 8/18/2007 5:05:17 PM   
hobby_man


 

Posts: 230
Joined: 1/13/2004
From: circle pines, MN, USA
Status: offline 		the drive train is smooth as silk, I may have the pinion gap a little narrow. how did you figure the 25amps? MATH?


her is the motor, I think it is anyway


KX850144A 430L Brushless Helicopter Motor (3550KV) ( AGNM4365 / KX850144A )