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Old Aug 01, 2010, 04:47 PM
K4UAV
dalbert02's Avatar
Miami, FL
Joined Jul 2003
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Will HK401b work with CC Thunderpower ESC for tricopter?

I have just finished the mechanical aspect of building my tricopter. Now I am installing electronics. My question is has anyone been able to get the HK401b gyro to work with Castle Creations Thunderbird 18s? Thanks,
-dave
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Old Aug 02, 2010, 02:59 PM
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BobRCnut's Avatar
Phoenix area
Joined Apr 2004
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Thunderbird 18's are not a good choice for tri's or quad's because the throttle endpoints are set AFTER arming the ESCs. This means that, under the right conditions, the ESC could reset its throttle endpoints while in flight. This is documented in several places in the Castle Creations vendor forum. Castle says they're essentially for fixed, wing, single motor only applications.
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Old Aug 03, 2010, 07:09 AM
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dalbert02's Avatar
Miami, FL
Joined Jul 2003
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Thank you. Do you think connecting power to the ESCs with throttle at "full up position" and then bringing it back down to hear the 'beeps' would set the throttle end points correctly? Or would the endpoints still vary throughout the flight?

Thank you again,

-dave
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Old Aug 03, 2010, 10:47 PM
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With the TB18's, that will not work because the ESC ignores anything but full low throttle. When you move the throttle to lowest point, the ESC arms itself. At that point you've set the low endpoint, but you must then move the throttle to full on, and the motor will go to max RPM and the TB sets its high throttle endpoint. Most other ESCs (including other Castle ESCs such as the Phoenix and ICE series) do not work this way... powering up a Phoenix or ICE with the throttle wide open sets the upper endpoint, but powering up a Thunderbird ESC with the throttle wide open simply puts the ESC in manual programming mode, and the Thunderbirds do not have a programming option for throttle range.
The worst case scenario is if you power up, arm the ESC (setting low endpoint in the process), then go to 75% throttle. After 1.5 seconds, the ESC will set the high endpoint to 75%. Later on, during the flight, you go to 100% throttle for more than 1.5 seconds... and the TB18 will reset its high endpoint to 100%, and now your throttle curve has changed. Once it's set to 100%, it will remain that way until power off, and the sequence starts over fresh at next power up.
Here's a link to a Castle Creations tech's description: http://www.rcgroups.com/forums/showt...rbird+throttle
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