Jack Crossfire's Blog – April 2010 Archive (5)

DEATH OF A FLAG







The 1st flag to be lifted autonomously suffered an acidic fate...



















when our field battery fell over & leaked acid on it. Lead acid

batteries do pour… Continue

Added by Jack Crossfire on April 30, 2010 at 11:30am — 2 Comments

This week in aerospace

AUTONOMOUS MARCY 2, OCEAN VIEWS, AIPTEK HELL













Back over the golf course to test yet another camera mount.…



















Continue

Added by Jack Crossfire on April 23, 2010 at 11:08am — 8 Comments

THIS WEEK IN AEROSPACE

MARCY 1, MARCY 2, VIKA 1, TILT SHIFT TERRORISM, AIR FORCE RESEARCH



DEATH OF A RADIO



Finally surrendered the ground station to tethering. It was a long battle with 72Mhz, 2.4Ghz XBees, & 900Mhz FSK but we never had enough money to make it reliable enough. Still using a custom transmitter with 8 channels. Went with a 2 conductor audio cable & 1/4" TRS connectors for the most reliable connection possible.



Nothing is more reliable than the 1/4" TRS connector,… Continue

Added by Jack Crossfire on April 16, 2010 at 12:04pm — 5 Comments

AIPTEK P-HD WARS

MARCY 2 FOAMED UP









Replaced the radio foam with Marcy Foam #2009 & that fixed the vibration, driving the gains way up. Yeah, it's that important.









Discovered PWM on Marcy 2 only updated at 166Hz. These problems are caused by lack of bits, so you try prescaling the timer to fit it in 16 bits. That broke rate damping. Only explanation is PWM granularity… Continue

Added by Jack Crossfire on April 9, 2010 at 10:57am — 5 Comments

MARCY 1 & MARCY 2 4 U

MARCY 2 CONTINUES AS A TRI ROTOR, RETURN OF STILL PHOTO TIMELAPSES



MARCY 1 ATTITUDE HOLD 4 U



Attitude hold on Marcy 1 seems to be a disaster. In the wind, She seemed to actually stabilize with the attitude hold on. When She got near the trees, that must have confused the thermopiles & caused her to bank away from the trees, leading to a seemingly stable position in the middle of the fairway.



In 1 short break between storms, the attitude hold was a… Continue

Added by Jack Crossfire on April 2, 2010 at 11:30am — 1 Comment

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