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This thread is privately moderated by Jack Crossfire, who may elect to delete unwanted replies.
May 19, 2009, 12:22 PM
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BofA needs $500,000,000,000

All because of those gyros doubling in price, now your bank needs double the bailout. Now your government needs to print double the money.

Ghetto IMU damage:

Passive components: $44.21
Gyros: $53.92
Transparencies: $32.76
Draino: $7
Ferric Chloride: $10.96
Photoresist board: $13.16


U know, it would have been cheaper to buy $90 of $parkfun breakout boards. Hopefully this'll come out cheaper in a few more boards. We can now build lighter boards for everything.

The actual cost of ghetto IMU consumables in 5/17/2009 dollars:

Gyros: $30
Passive components: under $1
Photoresist board, transparency & chemicals: under $2

Obviously much more in 5/18/2009 dollars, but at $33 it's not your normal IMU.

Then there's the Feigau spin copter disaster:


How R U supposed to recover that in a tri rotor?

Cost to use 2 more Feigau's + Chinese ESC's in a tri rotor:

Feigau 17g 150g thrust $33 * 2
Micro servo: $20
Tax: $8.6
Supersimple 10A $8 * 2
Chinese shipping $30


Cost to buy ESC's locally:

Feigau 17g 150g thrust, 3" propellers $33 * 2
Micro servo: $20
Castle 9A $25 * 2
Tax: 11.6


Cost to start over with chinese parts:

AD-C5 Micro Motor 4.6g 90g thrust, 2.5" propellers $18.20 * 3
Supersimple 10A $8 * 2
Chinese shipping $30
Micro servo: $20
Tax: $2


Batteries are the same. Hobbycity says those AD-C5's can't make as much thrust as the Feigau's, so U might still recover the Feigau investment. The AD-C5's would make a smaller vehicle, but the Feigau's have never been tested with 2.5" propellers.

If the spin copter was enclosed in a really strong duct with angled vanes instead of stators, it might still work. Need a carbon fiber autoclave.
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