JCadwell
Key Veteran
Location: Richland WA/ Morro Bay, CA
| That's what we are all here for.
TX- Transmitter
RX- Reciever
I would reccomend buying "Ray's Authoritative Helicopter Manual". Any of the major retailers should have it.
www.heliproz.com
www.ronlund.com
The Sceadu 50 is a great ship. I've got one, and really like it.
Follow the links on this page...
http://www.rchelicopters.org/beginners.mcic
As for curves, here is a brief summary...
Each flight mode (there are usually three or four in nicer radios (Normal, Idle Up1, Idle Up 2, throttle hold)) allows the user to program the respective values of the pitch and the throttle of the helicopter at a variety of transmitter stick positions... The number points available to adjust the ratio of pitch to throttle defines the number of points available from a radio. A radio with three point curves would allow you to adjust the throttle and pitch independantly at the bottom stick position (call this 0%) the middle stick position (50%) and the top stick position (100%). A radio with 5 point curves would let you adjust that ratio at 1/4 stick (25%) and 3/4 stick (75%) as well. The more points you have available, the better you can tailor the relationship between throttle and pitch. The ultimate goal is to maintain a constant headspeed (rotor RPM) throughout a flight, and throughout maneuvers. The more flexibility and resolution you have available to manipulate the relationship between throttle and pitch, the easier this is to do.
For example... A helicopter is started at idle. In order to start it at idle, you need to push the transmitter stick position all the way down in normal mode. At a stick position of 0%, you would then have a throttle setting of almost 0%. The pitch percentages correspond to degrees of pitch, so if 50% was equal to 0 degrees of pitch, you might have 50% pitch at 0% stick if you were learning. You would not want to feed in pitch until perhaps half stick. So the first three pitch points would be the same (assuming a 5 point curve.) You would then develop a relationship between pitch and throttle at each point available to determine that relationship. 1/4 stick might have 25% throttle, and 50% pitch, 1/2 stick would have 50% throttle and pitch, 3/4 stick would have 75% throttle and perhaps 75% pitch, and full stick would have 100% throttle, and 100% pitch. If you only had three point curves, you would only be able to input 0 stick with 0% throttle, 50% pitch, 1/2 stick, with 50% throttle, 50% pitch, and full stick with 100% throttle, and 100% pitch... Does this make any sense at all?
Thanks, John Cadwell |
