cptsnoopy
Posts: 540
Joined: 2/26/2005
From: Phoenix, AZ, USA
Status: offline
|
quote:
ORIGINAL: OverDosed
and wot did snoopy mean by 95-85-95 ?
Using a digital transmitter you have settings you can adjust and normally they are in % of travel. for some transmitters 0% is as far one way as you can go and 100% is as far the other way from center that you can go with 50% being the middle. My JR8103 is like that. When I get a new heli or power system in an older heli setup to run for the first time I set the transmitter to show what % of output travel it is telling the throttle to hold. Then I have someone else use an optic tachometer and while I slowly spin the blades faster and faster they tell me how fast the blades are spinning. When I get to the desired rotor blade speed, I look at the transmitter to see what % throttle travel on the transmitter is giving me the desired speed of the rotor blades. I remember that number and then shut down and unplug the batteries from the heli. Then I set the transmitter throttle curve to give me the desired speed by setting the % throttle travel as the low point (at the 1/2 throttle stick position) and I set a curve that goes from that point to a higher %throttle travel point as the near the ends of the stick travel because there will be an increase of blade pitch commanded also and the motor will need more power to compensate for the higher blade load.
on my 8103 I have 5 positions I can set. Low, 2, 3, 4, high these represent positions from idle through max throttle. I also have three flight mode settings that can use different throttle settings for each. these are call (on the JR8103) norm, st1, st2 I start flying in norm mode, this lets me have the motor stopped for plugging and unplugging the batteries before and after flight. my modes st1 and st2 are set the same. They have max desired throttle at the low positsion and the high position and a slightly lower desired throttle setting in the middle, hence the name, throttle curve.
so, for example my normal throttle curve for takeoff, landing and being able to stop the motor/rotor blades is.
norm: 0%, 2: 85% 3: 85%, 4: inh, high: 95%. you could use this setting all day long if you did not plan on doing acro or inverted flight.
for acro or inverted it is nice to be able to utilize your negative pitch that is available. to do this you need the motor producing the same power/pitch values as you did for normal flight with positive pitch. so my st1 and st2 flight mode settings are:
low: 95%, 2: inh, 3: 85%, 4: inh, high: 95%. now, if you go upside down during a manuever and you want to support the heli while inverted you just lower the throttle stick to what would normally be idle and the transmitter will output a command to increase power on the motor to keep the blades spinning at the correct speed.
All of the above settings are matched to rotor blade pitch changing along with the throttle changes. that is another similar setting in the transmitter called pitch curve.
If your transmitter has "exponential" capabilities then they should be turned on for the settings that I show. This allows a smoother transition between the setting points low, 2, 3, 4, and high for each flight mode.
|
Printable Version
All Forums >> RC Helicopters >> Electric RC Helis >> RE: Align T-rex 600 Build Thread - Pics inside! 
RE: Align T-rex 600 Build Thread - Pics inside! - 
WE THE GENERAL PUBLIC DEMAND TO SEE THE 
