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jpsabo's blog
Posted by jpsabo | Mar 04, 2012 @ 06:05 PM | 2,833 Views
I built a test stand to get a better understanding of the motors and props that I use. The flybrushless.com website has a great collection of results, so I contributed what I have collected to the database there.

Avroto 2814-11S 770 kV
http://www.flybrushless.com/motor/view/615
Tiger MT2216 900 kV
http://www.flybrushless.com/motor/view/616
Note: GemFan CF are carbon reinforced.


Posted by jpsabo | Dec 20, 2011 @ 03:33 PM | 2,592 Views
Break-In Procedure - Hyperion G3 LiPo are robust and do not need a complicated break-in procedure. We recommend that the first 5 uses are limited to 3C charge rates, and that pilots use throttle management to avoid long periods of max-rate discharge for those first 5 flights. Note also the other care suggestions below. Those apply pretty generally to any LiPo pack, not just Hyperion G3...

http://media.hyperion.hk/dn/g3lipo/
Posted by jpsabo | Sep 11, 2011 @ 12:27 PM | 2,919 Views
Here's a link to a nice online app to give you an idea of how weight, motors, props, battery, etc. all fit into flight time.

http://www.ecalc.ch/xcoptercalc_e.htm
Posted by jpsabo | Sep 10, 2011 @ 11:11 PM | 2,986 Views
Posted by jpsabo | Aug 28, 2011 @ 12:28 AM | 8,227 Views
A collection of links about PIDs and tuning

1) http://www.rcgroups.com/forums/showp...postcount=7460

2) http://www.multiwii.com/software
PID controller involves three separate parameters: the term Proportional, the term Integral and the term Derivative. The variation of each of these parameters alters the effectiveness of the stabilization.

Applied to a multirotor, the coefficients of these parameters can be translated by their behaviour:

Proportional coefficient: alone, it may achieve stabilization. This coefficient determines the importance of action on the engines in relation with the values measured by the gyroscopes. The higher the coefficient, the higher the tricopter seems more “rigid” versus angular deviation. If it is too low, the multicopter will appear soft and will be harder to keep steady. One can “feel” this setting by handling the tricopter and trying to change its orientation: the higher the parameter, the higher the opposition is important. In practice, this parameter must be set alone and increased up to be the limit for obtaining small oscillations. If too high, the system becomes unstable by amplifying the oscillations.

Integral coefficient: this coefficient can increase the precision of the angular position. In practice, when the tricopter is disturbed and its angle changes, the term Integral remembers the disruption and apply a correction to the engines to get the right angle. We can see this term as an heading hold factor. Typically if
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Posted by jpsabo | Aug 14, 2011 @ 04:03 PM | 2,939 Views
Posted by jpsabo | Aug 14, 2011 @ 11:19 AM | 3,199 Views
I've used these motors on 2 quads (frames from http://www.hoverthings.com) and have been pleased with their performance. I have a third build planned with these motors as well.

http://montorc.com/M2814Shaft.aspx
Posted by jpsabo | Aug 14, 2011 @ 10:32 AM | 3,435 Views
For those using the Quadrino MultiWii controller from witespy (http://www.rcgroups.com/forums/showthread.php?t=1438619), here is a record of the PID changes I have made for v1.7 (Quad X) and v1.8 (Quad X and Quad +) of the MultiWii software.

https://docs.google.com/spreadsheet/...Xc&output=html

You can get the controller here (2 versions, basic and advanced, are available): http://witespyquad.gostorego.com/
Posted by jpsabo | Aug 14, 2011 @ 10:20 AM | 3,296 Views
I've used these ESCs in 2 builds (Fyetech FY90Q and Quadrino MultiWii) and have been happy with their performance.

User guide: http://dl.dropbox.com/u/788548/Quadcopter/MayTech.pdf
US Source: http://montorc.com/MT30ABEC.aspx