RE: what the? Axe CP jumping in the air!  
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 >> Helimax >> RE: what the? Axe CP jumping in the air!
Page: <<   < prev  1 [2] 3 4   next >   >>  

Login
Message << Older Topic   Newer Topic >>
RE: what the? Axe CP jumping in the air! - 9/6/2007 3:39:44 AM   
strat1960s


 

Posts: 256
Joined: 7/27/2007
From: Great Falls , MT, USA
Status: offline 		Ok, that very well could be the answer. Are you suggesting greasing it? Where and how much??

Ted

_____________________________

I always have fun. Some times are more fun than others.
http://www.aimpages.com/strat1960s/profile.html

(in reply to PilotLight)
       Post #: 26

RE: what the? Axe CP jumping in the air! - 9/6/2007 4:54:53 PM   
alienteabagger


 

Posts: 312
Joined: 2/28/2007
From: miami, FL, USA
Status: offline 		Remember that a stock AxeCP uses z-bends on the servo control arms. Z-bends are inherently sloppy. That little bit of slop will translate into a slight movement of the swash which equals a change in direction. Once you get rid of the z-bends (intall ball links), then you have to deal with the "sticky collective". The plastic balls on the swash can have mold flash on them and if these aren't smoothed out they can cause the ball links to stick causing the swash to stick to one spot requiring more servo input than necessary which translates into a jumpy heli.

Then there's "transitional lift". If you fly in any kind of wind (including ground effect), changes in lift across the rotor disc will cause the heli to rise or fall. Especially with the AxeCP where the stock headspeed is pretty low. The only way to combat this is by using a higher headspeed.

_____________________________

Zit: T-Rex450SA Tiny: Thunder Tiger Raptor 50
http://www.rcuniverse.com/forum/m_7591039/tm.htm

(in reply to strat1960s)
       Post #: 27

RE: what the? Axe CP jumping in the air! - 9/7/2007 9:15:43 PM   
Iceman140


 

Posts: 29
Joined: 8/8/2007
From: Chicopee, MA, USA
Status: offline 		A lot of good sugessions, unfortunately they could all be right me thinks. I've seen belt driven tails snap to the right a couple of inches, but that was too obvious. The linkage was binding and when the servo overcame the binding the sudden overshooting of the linkage caused the snap. Same can happen in a binding swash, causing snap upward or downward. It doesn't take much.

I understand the tail motor drawing power away from the main motor thing, but in a belt driven tail, the tail rotors will draw down the main rotor speed as well, thus the throttle to gyro curve thingy that has to be setup. I'm not sure if the AxeCP motor is that responsive to cause a snap when the tail motor shuts off. Maybe. Depends on how fast the rise or fall is.

If you drill out a servo arm hole with anything over .055, it will be too big for the Z-bend link wires. Yeah I know, it's really tempting to use that 1/16" drill bit, but it's actually .0625 and too big for Z-bend wires. It would add even more slop.

Keep us up to date guys. Any solution that works is a good solution.

Ed

(in reply to alienteabagger)
       Post #: 28

RE: what the? Axe CP jumping in the air! - 9/7/2007 9:58:05 PM   
MMatheny


 

Posts: 805
Joined: 1/23/2003
From: Dickinson, TX, USA
Status: offline 		I have always used LubriPlate to pack my servos and other things that need to slide

_____________________________

Mike
"Never use your shins as a blade tracking device" - Mike

(in reply to Iceman140)
       Post #: 29

RE: what the? Axe CP jumping in the air! - 9/7/2007 11:21:38 PM   
alienteabagger


 

Posts: 312
Joined: 2/28/2007
From: miami, FL, USA
Status: offline 		When I had my AxeCP I replaced any and ALL z-bends with ball links. It is a cheap and effective mod. Then I smoothed all the ball ends on the swash and head assembly to eliminate binding. The sudden jumping stopped and became a slow and controllable up & down drift!

_____________________________

Zit: T-Rex450SA Tiny: Thunder Tiger Raptor 50
http://www.rcuniverse.com/forum/m_7591039/tm.htm

(in reply to MMatheny)
       Post #: 30

RE: what the? Axe CP jumping in the air! - 9/8/2007 5:02:19 PM   
strat1960s


 

Posts: 256
Joined: 7/27/2007
From: Great Falls , MT, USA
Status: offline 		Has anyone gone to the aluminum componets and had the same problem with their heli popping up?
Here is a copy of the emial I sent to Heli-Max and Tower Hobbies requesting info.

I’ve had a Heli-Max AXE CP for a few months now and I’d like to make a few upgrades. I was wandering if you could help me out.

Upgrade # 1: I’d like to replace all the swashplate linkages with the Z-bends to regular ball type linkages. What size ball linkages would you recommend and do you carry them? (I’ve been told the Z-bend type linkage sometimes binds causing the heli to pop up while in flight once the bound linkage breaks free.)

Upgrade # 2: I’d like to replace the swashplate, center hub & button, slide block and seesaw and flybar carrier with the aluminum parts available at Tower Hobbies. I however would like to leave the blade grips plastic to avoid further damage in the event of a crash. Will the plastic (stock) blade grips fit the aluminum center hub?

I'll have to wait and see what they have to say.

With all these folks having simular problems with the AXE CP popping up or down on them, you'd think the folks at Heli-Max would take a little more intrest in whats going on with their product.

I'll keep you all posted.
By the way I came into the shop to fly today, but I can't it's the Nat'l Guard's weekend to work in our shop. No flying for me this weekend. NUTZ!
Ted

_____________________________

I always have fun. Some times are more fun than others.
http://www.aimpages.com/strat1960s/profile.html

(in reply to alienteabagger)
       Post #: 31

RE: what the? Axe CP jumping in the air! - 9/8/2007 7:44:07 PM   
thestratcat



Posts: 1276
Joined: 5/7/2005
From: Dwight, IL, USA
Status: offline 		great news for me guys....

my Axe CP is no longer doing this jump thing... I crashed it a week or so ago and it no longer does what helicopters are supposed to do...

and on the continuing good news note....

I built my new heli and finished it this morning, it's a MX400/MX450 combination.. anyhow, when I try to fly this one, it does the jumping thing....







I sure do wish I hadn't pissed off the heli-gods

_____________________________

"If guns cause crime, all of mine are defective" ~ Ted Nugent.

(in reply to strat1960s)
       Post #: 32

RE: what the? Axe CP jumping in the air! - 9/8/2007 8:15:19 PM   
K94max


 

Posts: 67
Joined: 6/23/2007
From: Johnson City, TN, USA
Status: offline 		Strat, is the swashplate and head gear made of plastic or aluminum on the MX400? I've switched to a DX7 and AR6100 reciever on my AXE and it seems "smoother" but it may be because it is relatively new since it was replaced by Hobbico. I am having a problem with i "floating" up and down (can't find the sweet spot on the throttle stick yet) but it is not as severe as it was. Still yet, it is fairly new and my old one didn't start "popping" until i had flown it a couple of months.
I am thinking that there is some play in the plastic head/stock servos that allows some minute changes in the pitch and I think that is just something that is common with the Axe (plastic and servos) allowing some movement. I would think that all metal would be stiffer and not allow any play but I don't know.
Congrats on the MX400 - may I be nosy and ask your thought process in stepping up to the 400? I can't decide if I want to get something like the TREX450 or go on up to something like the Hurricane 550 in size. TOO Many choices - SO Little money.


_____________________________

Flying is for the Birds / Flying heli's is for the Nuts
Heli-Max Axe CP

(in reply to thestratcat)
       Post #: 33

RE: what the? Axe CP jumping in the air! - 9/8/2007 8:20:12 PM   
thestratcat



Posts: 1276
Joined: 5/7/2005
From: Dwight, IL, USA
Status: offline 		K94,

on the MX, it's an all aluminum head with a plastic swash plate...

oh, my thoughts on the 400 size... I guess it was price, the 600's are out and all, but you have to figure in chargers and li-po's and that also.. I don't want to go to the big boy stuff. I am tinkering with the nitro idea also, but I decided on electric first just because of ease adn I can sneak off during work and fly my electric and get an hour or two of flying at work!

I think both the T-rex or the MX400 or 450 is a great choice from what I've seen. I'll be getting a t-rex this fall for a winter project I'm sure..



< Message edited by thestratcat -- 9/8/2007 8:22:45 PM >

_____________________________

"If guns cause crime, all of mine are defective" ~ Ted Nugent.

(in reply to K94max)
       Post #: 34

RE: what the? Axe CP jumping in the air! - 9/8/2007 8:25:41 PM   
K94max


 

Posts: 67
Joined: 6/23/2007
From: Johnson City, TN, USA
Status: offline 		OK, Thanks. Did I read that the MX is jumping like the Axe did also?


_____________________________

Flying is for the Birds / Flying heli's is for the Nuts
Heli-Max Axe CP

(in reply to thestratcat)
       Post #: 35

RE: what the? Axe CP jumping in the air! - 9/8/2007 8:30:12 PM   
thestratcat



Posts: 1276
Joined: 5/7/2005
From: Dwight, IL, USA
Status: offline
quote:

ORIGINAL: K94max

OK, Thanks. Did I read that the MX is jumping like the Axe did also?



yup!



_____________________________

"If guns cause crime, all of mine are defective" ~ Ted Nugent.

(in reply to K94max)
       Post #: 36

RE: what the? Axe CP jumping in the air! - 9/8/2007 8:38:20 PM   
K94max


 

Posts: 67
Joined: 6/23/2007
From: Johnson City, TN, USA
Status: offline 		Not cool. If you were like me, upgrading the radio on mine and I thought things would be better. I beat the h*** out of it though with boom strikes so I quit flying it and spent a week on the sim trying to get used to the radio. Still not dialed in like the stock radio was set so it caused a new learning curve.
I hope you can get your new one flying smoother for you. As you stated earlier, you would think the Heli-max would get into this hopping about problem since it seems to effect more than one of thier models of birds.


_____________________________

Flying is for the Birds / Flying heli's is for the Nuts
Heli-Max Axe CP

(in reply to thestratcat)
       Post #: 37

RE: what the? Axe CP jumping in the air! - 9/8/2007 9:38:36 PM   
alienteabagger


 

Posts: 312
Joined: 2/28/2007
From: miami, FL, USA
Status: offline
quote:

ORIGINAL: thestratcat

K94,

on the MX, it's an all aluminum head with a plastic swash plate...

oh, my thoughts on the 400 size... I guess it was price, the 600's are out and all, but you have to figure in chargers and li-po's and that also.. I don't want to go to the big boy stuff. I am tinkering with the nitro idea also, but I decided on electric first just because of ease adn I can sneak off during work and fly my electric and get an hour or two of flying at work!

I think both the T-rex or the MX400 or 450 is a great choice from what I've seen. I'll be getting a t-rex this fall for a winter project I'm sure..





Told you to send me ur MX.... I know a way of appeasing the heli gods. It involves broekn heli parts and the spilled lube of other RC vehicles...

_____________________________

Zit: T-Rex450SA Tiny: Thunder Tiger Raptor 50
http://www.rcuniverse.com/forum/m_7591039/tm.htm

(in reply to thestratcat)
       Post #: 38

RE: what the? Axe CP jumping in the air! - 9/9/2007 12:22:20 AM   
Shack Man


 

Posts: 31
Joined: 5/1/2007
From: Somerset, KY, USA
Status: offline