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Jun 17, 2009, 12:29 PM
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jbourke better run another magazine ad

2 days on the Blog page. Either U people R too focused on your day jobs or The Goog changed its algorithm.

Ghetto blimp

Another idea is ghetto blimp. Instead of those gigantic envelopes U multi billion dollar home owers stuff away in your 1,000 sq ft mansions, ghetto blimp would be an 11" party balloon. It would offset some of the weight of the computer, sonar, & Xbee. The electronics + $20 Walmart power system would hang under it & it would spin around like spin copter. It would use the same throttle phasing & unbalanced payload to get translation, but solve the weight problem with heleman.

It would be completely impractical, but it would prove indoor sonar flight & eliminate the risk of spin copter.

The minimal sonar autopilot is coming in at 10g. The balloon reduces it to 5g. U could probably get the autopilot to 5g by using a 900Mhz radio chip, no sonar amplifier, & eliminating the Walmart computer.

Unfortunately, any time U introduce blimps, it turns into a toy.

Atmel vs Microchip 900Mhz

fully powered antenna output
smaller package

needs RF choked antenna power
bigger package
not at digikey

Everything from Atmel is newer. We would interface the chips with SPI & forget about extra microcontrollers. Probably couldn't fit GPS in Vika 2's RAM with that method.

More Vika 2 4 U

Whew. Vika 2 is definitely a crash prone wreck. The Super Cheap ESC's don't cut off. She's too weak to stay in the air by 10.0V & appears to enter a horizontal oscillation & altitude loss. U think it's PID miscalibration but it's really, wait for it, saturated PWM output. Your flight time is around 5 minutes.

Another upgrade to the position derived heading code, no wind, & she seems a bit more stable. IDG300 drift is a real problem. The 1st attempt usually flies away as the gyro temperature is unadapted to the prop wash. The 2nd attempt starts out loose & tightens up as the gyro temperature stabilizes.

So the office of management & budget doesn't want to fund anything until Vika 2 can fly circuits, automatically take off & land.
Last edited by Jack Crossfire; Jun 17, 2009 at 12:38 PM.
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