 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
| HomeDiscussion Groups General ModelsRailroadsRocketsRadio Controlled Air ModelsHelicoptersLand ModelsWater ModelsModelGeeks.com Contact UsLink To UsSearch & Site Map |
Model Forum / Radio Controlled / Helicopters / February 2008Twitchy tail rotor
I have an Heli-Max AXE CP all electric helicopter. Recently the tail rotor has become twitchy. It changes it's RPM often and instantly. Twitchy is the best way I can describe it. This makes it pretty hard to control the heli. Thee heli has had a few tail strikes on the ground ( enough to break the rotor and gear teeth) and a few low altitude (3 or 4 foot) crashes but nothing I would have considered very bad. Any idea what might cause this. I hate to just start replacing things that aren't bad. Low transmitter batteries? Bad ESC. Bad tail rotor motor? coustanis brought forth on stone tablets: > I have an Heli-Max AXE CP all electric helicopter. > Recently the tail rotor has become twitchy. It changes it's RPM often [quoted text clipped - 11 lines] > Bad ESC. > Bad tail rotor motor? bad gyro? > coustanis brought forth on stone tablets: > [quoted text clipped - 15 lines] > > bad gyro? I'm not sure it has one. I seem to remember reading that it did but I sure don't see it. >> coustanis brought forth on stone tablets: >> [quoted text clipped - 16 lines] > I'm not sure it has one. I seem to remember reading that it did but I > sure don't see it. its all in the receiver brick 4 in 1, receiver gyro and speed controllers > >> coustanis brought forth on stone tablets: > [quoted text clipped - 18 lines] > > its all in the receiver brick 4 in 1, receiver gyro and speed controllers I looked it up. It does indeed have one. One board is the receiver and the other is the E board with the gyro / mixer etc. That is one tiny gyro. Hard to think it would have much effect. Anyway, there are some tuning pots on that board for tweaking gyro gain and tail rotor trim. Wonder if it got banged around too much. Is that common? Would a twitchy tail rotor be a symptom of a bad gyro? > >> coustanis brought forth on stone tablets: > [quoted text clipped - 18 lines] > > its all in the receiver brick 4 in 1, receiver gyro and speed controllers I looked it up. It does indeed have one. One board is the receiver and the other is the E board with the gyro / mixer etc. That is one tiny gyro. Hard to think it would have much effect. Anyway, there are some tuning pots on that board for tweaking gyro gain and tail rotor trim. Wonder if it got banged around too much. Is that common? Would a twitchy tail rotor be a symptom of a bad gyro? > >> coustanis brought forth on stone tablets: > [quoted text clipped - 18 lines] > > its all in the receiver brick 4 in 1, receiver gyro and speed controllers I looked it up. It does indeed have one. One board is the receiver and the other is the E board with the gyro / mixer etc. That is one tiny gyro. Hard to think it would have much effect. Anyway, there are some tuning pots on that board for tweaking gyro gain and tail rotor trim. Wonder if it got banged around too much. Is that common? Would a twitchy tail rotor be a symptom of a bad gyro? > >> coustanis brought forth on stone tablets: > [quoted text clipped - 18 lines] > > its all in the receiver brick 4 in 1, receiver gyro and speed controllers I looked it up. It does indeed have one. One board is the receiver and the other is the E board with the gyro / mixer etc. That is one tiny gyro. Hard to think it would have much effect. Anyway, there are some tuning pots on that board for tweaking gyro gain and tail rotor trim. Wonder if it got banged around too much. Is that common? Would a twitchy tail rotor be a symptom of a bad gyro? coustanis brought forth on stone tablets: >>>>coustanis brought forth on stone tablets: >> [quoted text clipped - 27 lines] > Wonder if it got banged around too much. Is that common? > Would a twitchy tail rotor be a symptom of a bad gyro? yes. I have also seen the tail rotor "develop a mind of its own' at the very end of the battery charge. Apparently, when the battery voltage gets low enough, gyro operation becomes erratic for some reason. bob > coustanis brought forth on stone tablets: > [quoted text clipped - 37 lines] > > bob This happens on a fresh charge, unless my battery packs are bad. They're pretty new and don't have that many charges on them. They get hot after running and I put them in the refridgerator or freezer for a quick cool-down prior to recharging. I recharge for two hours. I'll get a fresh charge and pay close attention to see if it's twitchy at the start. > > >> coustanis brought forth on stone tablets: > [quoted text clipped - 26 lines] > Wonder if it got banged around too much. Is that common? > Would a twitchy tail rotor be a symptom of a bad gyro? Sorry for the triple posts. The network here kept stalling and I didn't know the post was submitted. >I have an Heli-Max AXE CP all electric helicopter. >Recently the tail rotor has become twitchy. It changes it's RPM often [quoted text clipped - 11 lines] >Bad ESC. >Bad tail rotor motor? My money is on option 3 - bad tail rotor motor. Pretty common failure for thse micros with a motor driven tail rotor. On Feb 4, 4:51 pm, The OTHER Kevin in San Diego <skiddz "AT" adelphia "DOT" net> wrote: > On Mon, 4 Feb 2008 09:47:21 -0800 (PST), coustanis > [quoted text clipped - 17 lines] > My money is on option 3 - bad tail rotor motor. Pretty common failure > for thse micros with a motor driven tail rotor. Well, I suppose th if I hook a volt meter to the motor and see no voltage fluxuations, it would be the motor. If I see an erratic voltage jumping about, it must be in the circuit somewhere. > On Feb 4, 4:51 pm, The OTHER Kevin in San Diego <skiddz "AT" adelphia > "DOT" net> wrote: [quoted text clipped - 23 lines] > If I see an erratic voltage jumping about, it must be in the circuit > somewhere. I have a blade cp and that symptom usually means that the tail motor is loosing torque and the gyro is trying to compensate for the problem. So if you put a voltmeter on the connections it will fluctuate. Sometimes it can be adjusted with the gyro in the 4-in-1 until it holds steady but eventually the tail motor has to be replaced mainly because it will overheat after a minute or two of flying around and start acting up again or worst kill your 4-in-one. Frankly I would try replacing the motor first since its roughly 10 dollars at the LHS and the 4-in-1 runs around 40 to 60 dollars depending on who manufactures the thing. > > On Feb 4, 4:51 pm, The OTHER Kevin in San Diego <skiddz "AT" adelphia > > "DOT" net> wrote: [quoted text clipped - 36 lines] > at the LHS and the 4-in-1 runs around 40 to 60 dollars depending on who > manufactures the thing. I didn't think the LHS would have such a specialized thing. Tower Hobbies wants 25 bucks plus shipping. I'll give that a try. Thanks. >I didn't think the LHS would have such a specialized thing. Tower >Hobbies wants 25 bucks plus shipping. >I'll give that a try. GWS FW50H motor, GWS direct drive kit and a GWS 3030 prop will ease the load on the tail motor, provide better TR control and not burn a hole in your pocket. On Feb 5, 2:47 pm, The OTHER Kevin in San Diego <skiddz "AT" adelphia "DOT" net> wrote: > On Tue, 5 Feb 2008 11:13:11 -0800 (PST), coustanis > [quoted text clipped - 6 lines] > the load on the tail motor, provide better TR control and not burn a > hole in your pocket. I'm going to look into that. Thanks, On Feb 5, 2:47 pm, The OTHER Kevin in San Diego <skiddz "AT" adelphia "DOT" net> wrote: > On Tue, 5 Feb 2008 11:13:11 -0800 (PST), coustanis > [quoted text clipped - 6 lines] > the load on the tail motor, provide better TR control and not burn a > hole in your pocket. Google only returns fishing equip on that. You wouldn't happen to have a link, would you. Thank you. >Google only returns fishing equip on that. You wouldn't happen to >have a link, would you. > >Thank you. Here's one to start you off.. http://www.helihobby.com/html/blade_helicopter.html On Feb 6, 2:06 pm, The OTHER Kevin in San Diego <skiddz "AT" adelphia "DOT" net> wrote: > On Wed, 6 Feb 2008 08:33:19 -0800 (PST), coustanis > [quoted text clipped - 7 lines] > > http://www.helihobby.com/html/blade_helicopter.html Thank you. |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.