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Oct 28, 2008, 11:30 PM
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Death of a T-Rex


Well, the revelation about $12 motors changes everything.

It's time to put the T-Rex down. The starboard servo is repeatedly failing 4 a reason & that is either a damaged BEC or extreme sensitivity of the HS-65 servos to stalling.

The hope was to get a full life out of all 4 servos until burn out, but a replacement servo & BEC is 1/2 the cost of a complete quad rotor.

All crashes with the T-Rex were servo wear, radio failure, & tail belt failure. Quad rotors should never wear out since they have no brush motors. Assume U can control the radio failures & U have no reason to expect the quad to crash in normal operations.

Brushless motors + ESC's: $22 * 4
2 pusher props: $8
2 puller props: $2
Carbon fiber rods: $20
--------------------------------------
Total: $120

The economics don't support articulated rotors anymore. Our recently federally funded bank's credit card seems to have reset for November.

Now some secrets of lwneuralnet. It might be hackable to support backpropagation through time.



net_begin_batch

// solve network forward in time
net_compute

// compute error gradient for network backward in time
net_compute_output_error

// Need to get the derivatives from the inputs of one net_train_batch to
// the outputs of another net_train_batch.

// Set derivatives
net_train_batch

// Adjust weights based on average error gradient for all time
net_end_batch
Last edited by Jack Crossfire; Oct 28, 2008 at 11:52 PM.
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