Recent content by Scott Drysdale

Bartman..... This is excellent! BTW - My experience has been that none of the forums enable rapid searching by specific topics...... but there is often the ability to enter tags and the bottom of a new post. Is that still the case here or is there a better way now?

Active on Multirotor forums, Multirotor Systems development for aerial video and photo work.

Are the following statements correct? Factors affecting the ability of the Flight controller to maintain horizontal stability include: Angular momentum = motor arm length + motor weight + vertical rotational speed...... http://en.wikipedia.org/wiki/Angular_momentum Motor torque needed to...

Bartman and R_Lefebvre are correct....... Put another way..... FC leveling control relies on the motors capability to respond instantaneously to complete PID loop feedback correction. If the motor torque is adequate for the size of props, there should be little or no delay with motor speed...

Based on what I have been reading, for those considering moving past FW 2.3, they should jump straight to FW 2.6 and skip 2.4......due to an issue with start-up speed. And then there is always the mystery as to why there was a jump from 2.4 to 2.6 and no 2.5 FW release....... a bit confusing...

Based on what I have been reading, for those considering moving past FW 2.3, they should jump straight to FW 2.6 and skip 2.4......due to an issue with start-up speed. And then there is always the mystery as to why there was a jump from 2.4 to 2.6 and no 2.5 FW release....... a bit confusing for...

Is that loud crack you hear when connecting the batteries really your friend? Maybe..... maybe not. Here is what happens inside of microprocessors as a result of inadequate surge protection between your residential service and your PC. Voltage spikes can momentarily reach thousands of volts...

Working thru on the basis of what the newest DJI S900 and S1000 are using and also some of the new batteries that are coming out of Asia specifically for the larger DJI Multirotors: There are two sizes/types of connectors being used, i.e., the AX150 and the XT150. DJI uses the black XT-150 for...

A corroded or worn battery connector will function as a resistor creating a voltage division circuit between battery and the load...... net result is that you will always get less than the full voltage at the load end relative to the power supply end. And as the current demand increases at the...

Bear in mind that the original IMU systems developed back in the mid 60's for the Saturn VB and LEM were able to balance an entire rocket on top of the gimballed motor thrusters/nozzles...... more demanding for the programming as it had to also account for inherent mechanical design instability.

Khaled...... MR stands for Multi-rotor. AUW = All Up Weight. R_Lebfebvre has some give classroom video instructions on the disc area concept as it relates to MRs and conventional rotorcraft. Methanol/nitro fuel to drive a single rotor heli might still be the best choice for long duration aerial...

It is a gyro issue on the yaw axis which needs to be recalibrated. Also much will depend on the yaw axis IMU placement, i.e., above or below the yaw motor. Personally I believe the real source of the problem is the limitation of the simple IMU sensors used on the BaseCAM and Martinez BGCs...

:tennis:Make more sense? Yes..... most liquid fuels have a vastly superior energy density over any battery electrochemistry and there is less dead weight being carried with liquid power as the fuel level goes down. Highest energy density fuel is kerosene followed by diesel, then gasoline and...

This seems to be all about the batteries..... eCalc is one of the better tools for predicting the optimum throttle hover position. But apparently that 50% number is a bit off for those in to aerial video work as it leaves the rig prone much more prone to wind buffeting if I recall correctly...

I just finished configuring one for a friend and there was simply a bit of confusion as to where to plug in to s.bus on the receiver (I thought there were 3 ports - got confused between channel 7 and 8)..... also I did not go to mode B. I think it was the same receiver, the one that comes with...