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HelicopterMain Discussion › travel adj.
10-21-2009 03:29 PM  8 years agoPost 1
dave90

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newport news

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hello guys

i learned the basic and advance way to set up a helicopter...not into hard 3D but 2D

and i always wonder about a certin thing on the radio setup but will not want to try it on my real models due to the fact i do not know the outcome or this adjustment

on the travel adjustment i been told to leave it at all 100, which i did. then i notice you can not only decrease travel adj. on the radio, you can increase it to about 150 if i remember.

if i increase all the main travel adj. like elevator ail. and pitch. will it make the helicopter react faster then it being set at 100?

and do anyone here do that seting? and is thier a major different in flight and is it worth doing?

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10-21-2009 03:40 PM  8 years agoPost 2
ShuRugal

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Killeen, TX

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eh, dont know who told you not to adjust your travels, but they seem to want you to burn up servos.

Travel adjustment is used to keep your servos from trying to move past a mechanical obstruction. You should set up your travel adjusts on each channel so that the servo stop -before- it or something it drives binds on another part or its own overtravel-stops.

AMA 700159

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10-21-2009 03:44 PM  8 years agoPost 3
brandov2

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az

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Actually you need to set the travel atleast 100 under that is hard on servos...If it binds at 100 move the attach point on the servo wheel in..If It does not bind yes it will make the swash etc throttle arm move farther in travel above 100 to answer your question..And in turn will give more cyclic etc..But make sure when and if you do there is no binding anywhere and the servo is not at the end of travel..Really depends on if its mechanical mixing or ccpm also..Except for throttle
Hope that helps

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10-21-2009 03:45 PM  8 years agoPost 4
Frank Bostwick

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Cincinnati Ohio

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Travel adjust can be use for a lot of things. You can use it to adjust out most CCPM interactions. I use it on the gear chnl to adjust my gyro gain. Its used to adjust the length of travel in A direction. For instance if you set up for zero pitch at center stick and have a pitch range of +- 10 deg, and are just learning, you could use Travel adj to limit the NEG and or Pos pitch to your liking. (this would work best on a NON CCPMe heli where 1 servo is used for pitch only). Yes you can use it to "Over drive" servo travel and yes it will have an effect where ever you use it. How much effect depends on where and how much you choose to use. Id say most people use it today to adjust out interaction from CCPMe helis and or to eliminate binding conditions in the control system. There is a good HF vid on travel adjust, sub trim and dual rates, well worth the time to watch it until you understand it.

RIP ROMAN

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10-21-2009 03:57 PM  8 years agoPost 5
dave90

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newport news

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i am sorry.

when i said not to use travel adj. meaning not to go over 100...

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10-21-2009 04:31 PM  8 years agoPost 6
T-Rex-Flyer

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Panama City, Fl

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brandov2
Actually you need to set the travel atleast 100 under that is hard on servos
Really, I've not heard that, why would setting under 100 be harmful to you're servos?

If the wings are traveling faster than the fuselage, it's probably a helicopter.

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10-21-2009 04:34 PM  8 years agoPost 7
cbflys

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Nesconset, NY - USA

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If you look at it from the servo back, it may be a little easier to understand ...

Servo speed and torque do not change as endpoints are varied; only the amount of servo travel does. So for instance, to produce equal pushrod deflection, you can increase end points and move the pushrod closer in on the output shaft. In this case, what you've essentially done is to increase the amount of time it takes the pushrod to cover the same distance. But you've also 'mechanically' increased torque; simply due to the leverage gained by using a smaller 'arm'.

Now look at the servo. Its positioning accuracy doesn't change with endpoints either. What does change is the number of position 'steps' between the transmitter control limits. Said another way - servo positioning accuracy remains constant; you just get more steps between the control limits (due to the increased travel) as you expand the endpoints.

Some believe that having more steps between the travel limits really does increase resolution. But consider this; smaller stick movements are necessary to produce equivalent servo movement as end points are expanded. So the positioning resolution gained at the servo is reduced proportionally at the transmitter.

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10-21-2009 04:40 PM  8 years agoPost 8
brandov2

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az

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I have had a couple guys tell me that over the years..One well known pro.. I had been setting mine using lower end points and had two or 3 burn out on same thing..I shortened arm got another servo set it at 100 or slightly above no more problems.. Just think the optimum is 100 endpoint..

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10-21-2009 04:45 PM  8 years agoPost 9
cbflys

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Nesconset, NY - USA

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The further out you attach a pushrod, the harder the servo needs to work. It all boils down to a balance of torque and speed.

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10-21-2009 05:31 PM  8 years agoPost 10
dave90

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newport news

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ok guys

i been haveing issues with my 700 traveling from full neg to positive

when im at center stick i use subtrim to level the swashplate, and the swash plate is leveled as can be in mid stick..but once i give it neg. the swash plate becomes unleveled for example...center zero..travel to neg..and the swash plate slowly becomes unleveled in full neg..i return to mid stick she is leveled...i go to full positive its becomes unleveled..

basicly on the one side which is i think the pitch servo side...it travels alot further then the ailron side going both neg and pos. but in center she becomes leveled..

do i fix that on my pitch on travel adj? or is it a link size issue?

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10-21-2009 06:37 PM  8 years agoPost 11
cbflys

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Nesconset, NY - USA

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Find a good tutorial on eCCPM setup. But in a nutshell, you don't use sub-trim to level the swash. Use subtrim to get the servo arms 90 degrees to the pushrods at mid stick, then use the links to level the swash. Once that's done, use travel adjust if necessary to level the swash at full negative and full positive.

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