<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;">Yes David there are hobby bushless controllers that reverse. The R/C cars and boats are starting to pick up on brushless too.<br><br>Here are a few links to check out:<br><br><span><a target="_blank" href="http://www.teamnovak.com/products/esc/gtb/index.html">http://www.teamnovak.com/products/esc/gtb/index.html</a></span><br><span><a target="_blank" href="http://www.hobby-lobby.com/boatcont.htm">http://www.hobby-lobby.com/boatcont.htm</a></span><br><span><a target="_blank" href="http://www.castlecreations.com/products/barracuda-80.html">http://www.castlecreations.com/products/barracuda-80.html</a></span><br><span><a target="_blank"
href="http://www2.towerhobbies.com/cgi-bin/wti0093p?&C=MJE&P=0">http://www2.towerhobbies.com/cgi-bin/wti0093p?&C=MJE&P=0</a></span><br><br>Some are kinda pricey but brushless is considered high end.<br><br>Thanks,<br><br>Glenn<br><br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;">----- Original Message ----<br>From: dpa <dpa@io.isem.smu.edu><br>To: dprglist@dprg.org<br>Sent: Monday, June 11, 2007 4:09:13 PM<br>Subject: [DPRG] R/C heli technology<br><br><div>Howdy,<br><br>Did my first hover today with my new helicopter, (a TREX-450 with a<br>Spektrum DX7 radio, for those in-the-know :)<br><br>This is some seriously cool technology. The gyro itelf is about the<br>size of a nickle, and includes an 8-led "level meter" with 5 green <br>leds for programming modes and a push button for user input! The <br>motor is brushless with a very nifty speed controller that uses sound<br>output for programming
feedback and the R/C link for programming input,<br>all based on timing, for things like slew rates, gain controls,<br>and gain limits. Extremely nice.<br><br>The whole thing lights up like a Christmas tree and sings like R2-D2<br>during powerup. I love it!<br><br>The heli uses a 2200 mAh 11.7v LiPo battery pack about the size<br>of a small Snickers candybar, that charges in just one hour. <br><br>Once again I think we robot folks have a great ally in the R/C car/<br>plane and now helicopter crowd. Seems like one of these "heading<br>hold" gyros might be just the ticket for odometry+gyro robot<br>navigation, indoors or ourdoors.<br><br>Does anyone know of a brushless speed controller that can be reversed?<br><br>The helicopter, of course, just runs the motor in one direction and<br>reverses the pitch of the blades, but a robot needs to be able to<br>reverse its motors in software. The speed controller has
three<br>leads and reversing any two of them reverse the direction of the<br>motor. That suggests that it would not be difficult to build a<br>controller that can reverse the motor. Anybody know if such a<br>thing exists?<br><br>best,<br>dpa<br><br>_______________________________________________<br>DPRGlist mailing list<br>DPRGlist@dprg.org<br><a target="_blank" href="http://list.dprg.org/mailman/listinfo/dprglist">http://list.dprg.org/mailman/listinfo/dprglist</a><br></div></div><br></div></div></body></html>