RE: MX450 XS Discussion Thread

RE: MX450 XS Discussion Thread
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RE: MX450 XS Discussion Thread - 4/6/2008 3:52:31 PM

osterizer

Posts: 1469
Joined: 3/10/2007
From: Sykesville, MD, USA
Status: offline

Pretty good, Tex. How are you? I hear the weather should be getting better over there now so you can go chop some more corn

.

Heliman-1: I'd try an 11T pinion to start with.

quote:

ORIGINAL: []TEX[]

Been a while since I posted here, strange since I was the thread starter.

Anyway, the T-Rex has passed on to the bay. Looking for something bigger to break.

How goes it osterizer?

(in reply to []TEX[])

Post #: 1326

RE: MX450 XS Discussion Thread - 4/6/2008 4:22:30 PM

osterizer

Posts: 1469
Joined: 3/10/2007
From: Sykesville, MD, USA
Status: offline

hikai- with that setup I'd be looking at tail binding, head speed, and gyro setup or tail range setup. When you power the heli up, the tail should start off with a little right pitch- what does yours look like?

quote:

ORIGINAL: hikai

Need advise on setting up the MX450.
Problem: The heli will rotate counter clockwise when it lifts. If I move the rudder stick about 80% right prior to starting to hover it may then move in a clockwise direction, however it is impossible to control.
The MX450 is configured as follows:
- The tail servo is a Futaba S3114
- The main rotor turns clockwise and the tail rotor turns clockwise
- The tail rotor is configured as shown in the photo (picture) on the front or 1st page of the instruction manual and on the box. (blunt side of top blade of tail rotor if facing the back of the heli)
- Rudder right stick - servo arm moves aft
- Rotate heli nose left - servo arm moves aft.

(in reply to hikai)

Post #: 1327

RE: MX450 XS Discussion Thread - 4/6/2008 7:21:56 PM

dpleasants

Posts: 38
Joined: 1/6/2008
From: Junction City, KY, USA
Status: offline

The screw set is hel002. Their web site is www.rcscrewz.com

_____________________________

David Pleasants
AMA No. 902968

(in reply to hikai)

Post #: 1328

RE: MX450 XS Discussion Thread - 4/7/2008 12:53:03 AM

Ductapemaster

Posts: 14
Joined: 1/29/2006
From: Laguna Hills, CA, USA
Status: offline

Well, I took my heli over to the hobby shop today to get it set up! First off we worked with getting the swash working correctly. I had to switch two servo leads and reverse a bunch of stuff in the radio...my darn radio manual doesn't say anything about which channel is which when hooking up the swash servos! Once we got it working, we took it out to the parking lot for a test flight. We spun it up and it didn't go anywhere! We realized that the pitch was backwards and we were giving more negative collective when it should be positive...not cool since we just got everything adjusted. To fix it we went the cheap route and I just reversed the pitch curve (starts at 100 and goes to 0) and we were set to go. Back out to the parking lot...we spooled it up, gave it a little collective...and...it flew!!!! I was ecstatic! And to think I wasn't the one flying it...

Well, that's my story...it still needs a bit of adjustment before I go fly. A little ESC programming and a small gyro gain adjustment and I'll have my first flight by myself!

Wish me luck!

-Dan

(in reply to dpleasants)

Post #: 1329

RE: MX450 XS Discussion Thread - 4/7/2008 1:33:05 AM

osterizer

Posts: 1469
Joined: 3/10/2007
From: Sykesville, MD, USA
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Good deal, Dan! Glad it's working now- getting a little help there is the best way to get ther.

BTW, you just need to reverse the sign of the collective part of your swash mix. I could tell you how to do it on Futaba, but I don't have a Spektrum radio so I can't point you to just the right setting. Hopefully someone with a DX is listening in.....

(in reply to Ductapemaster)

Post #: 1330

RE: MX450 XS Discussion Thread - 4/7/2008 2:35:01 AM

Ductapemaster

Posts: 14
Joined: 1/29/2006
From: Laguna Hills, CA, USA
Status: offline

I tried that already...it didn't seem to work, but maybe thats just me. They're set at 100% Aileron, 60% Elevator, and 60% Pitch. Should I just reverse the pitch value or should I do all of them? This means more readjusting...I better get used to it!

Thanks!

-Dan

EDIT: Anyone have suggestions on how to mount the battery? Mine just hangs off the end of the "mount" that comes with it...I don't really like this configuration and the body won't fit on it.

< Message edited by Ductapemaster -- 4/7/2008 2:39:48 AM >

(in reply to osterizer)

Post #: 1331

RE: MX450 XS Discussion Thread - 4/7/2008 3:23:51 AM

hikai

Posts: 20
Joined: 8/25/2002
From: CO
Status: offline

osterizer: The tail wants to turn right as the pitch or throttle increases. The normal throttle curve is 0 45 70 85 90: at mid stick or 0 pitch the main rotor turns about 2400 rpm. The KV of the brushless motor (OBL 29/35-10H) is 3500KV. The spur gear is 14T supplied with the MX450. The ESC is an ACE RC BLC-40 No. 8041-H. The motor and esc were removed from a Tunder Tiger MiniTitan. The normal pitch curve is 40 - 50 - 100. The main rotor pitch at the lowest throttle setting for the Normal Throttle and Pitch curves is about -2 degrees. The main rotor pitch at the highest throttle setting for the Normal Throttle and Pitch curves is about +8 degrees. The swash mix is set at 120 degrees with AIR +90, Elev +90 and Pitch +90.

(in reply to Ductapemaster)

Post #: 1332

RE: MX450 XS Discussion Thread - 4/7/2008 3:42:56 AM

easternav

Posts: 40
Joined: 5/8/2007
From: Chocowinity, NC, USA
Status: offline

Well I guess I'll give the mx another try. The last time I drove her tail first in the ground and desided that I was not going to rebuild it because I wanted a trex 450 se v2,but the price is just out of my range.

So I give it one more try. Does any one know what kind or if any replacement parts can be bought to get better tracking? I have had one heck of a time trying to get them to track.

(in reply to hikai)

Post #: 1333

RE: MX450 XS Discussion Thread - 4/7/2008 3:46:46 AM

easternav

Posts: 40
Joined: 5/8/2007
From: Chocowinity, NC, USA
Status: offline

one more ? how far is the swashplate suppost to tilt? in deg.

(in reply to easternav)

Post #: 1334

RE: MX450 XS Discussion Thread - 4/7/2008 4:00:32 AM

osterizer

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From: Sykesville, MD, USA
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quote:

ORIGINAL: hikai

osterizer: The tail wants to turn right as the pitch or throttle increases. The normal throttle curve is 0 45 70 85 90: at mid stick or 0 pitch the main rotor turns about 2400 rpm. The KV of the brushless motor (OBL 29/35-10H) is 3500KV. The spur gear is 14T supplied with the MX450. The ESC is an ACE RC BLC-40 No. 8041-H. The motor and esc were removed from a Tunder Tiger MiniTitan. The normal pitch curve is 40 - 50 - 100. The main rotor pitch at the lowest throttle setting for the Normal Throttle and Pitch curves is about -2 degrees. The main rotor pitch at the highest throttle setting for the Normal Throttle and Pitch curves is about +8 degrees. The swash mix is set at 120 degrees with AIR +90, Elev +90 and Pitch +90.

Wow- if you're using the Ripper you really need to back off from the 14T- more like an 11T! The 14T will spin the blades off the MX.

With that, next is the gyro and tail servo. Which are you using?

(in reply to hikai)

Post #: 1335

RE: MX450 XS Discussion Thread - 4/7/2008 11:19:20 PM

hikai

Posts: 20
Joined: 8/25/2002
From: CO
Status: offline

osterizer: The tail servo is a Futaba S3114 and the Gyro a Futaba GY401. I've checked the gyro by installing the gyro on different heli with a Futaba digital S9650 tail servo. The hovering was great with the Futaba GY401 gyro installed on the other heli. If the gyro is bypassed and the servo connected directly to the rudder channel of the receiver, the Futaba S3114 servo appears to be ok. Servo is centered with no movement of the rudder stick on the reciever, right stick the servo move in one direction and left stick the servo moves in the opposite direction. I also replaced the Spektrum AR6100 receiver with another Spektrum AR6100 receiver that I had to remove from an byplane. No luck... same symptoms. Any ideas would be appreciated.

(in reply to osterizer)

Post #: 1336

RE: MX450 XS Discussion Thread - 4/8/2008 12:38:19 AM

osterizer

Posts: 1469
Joined: 3/10/2007
From: Sykesville, MD, USA
Status: offline

Hi, hikai. It sounds like you have things going in the right directions. I've used the 3154 (digital version of the 3114), so I'm pretty sure the 3114 should work. I assume you've tried increasing the gain so the gyro will come in sooner?

Also, it's probably fine, but you should also check the tail belt tension so you're sure it's not slipping.

Did you check the pitch range on the tail? When mine was set up at 2400, I'd have about 5 degrees right pitch at neutral versus flat, then full right was about 40 degrees, and left maybe 10 degrees. I had the ball on the servo arm 7 or 8 mm from the center, then trimmed the neutral position in rate mode to hold zero with no transmitter trim by adjusting the length of the pushrod. If you can get it adjusted properly in rate mode, then AVCS will hold without a problem.

(in reply to hikai)

Post #: 1337

RE: MX450 XS Discussion Thread - 4/8/2008 2:20:48 AM

hikai

Posts: 20
Joined: 8/25/2002
From: CO
Status: offline

Hi Osterizer. Changing the gain on the gyro has little or no affect on the symptoms of the problem. The belt tension is adjusted per the instructions and appears to be ok.. If I turn the main rotor and hold the tail rotor there is no slippage.
With the gyro in the non-heading mode the pitch of the tail rotor in the horizontal position is close to neutral (90 degrees) with the rudder stick of the transmitter in the neutral position. Full right stick the tail rotor turns about 10 degrees from the neutral position and full left stick the tail rotor turns about 15 degrees from the neutral position. The servo arm ball is between 7 and 8 mm from the center of the servo arm. You set your tail rotor pitch at 2400... what is 2400 in reference to??? It apprears that your tail rotor will move about 50 degrees from full right to full left stick on the rudder. What is the process to measure the tail rotor movement in degrees. It appears that your tail rotor will move 2x more than my tail rotor.

(in reply to osterizer)

Post #: 1338