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Electric Stunt => Gettin all AMP'ed up! => Topic started by: Dennis Toth on June 22, 2024, 11:50:07 AM
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Looking to switch timers to an FM9 that I have had laying around for a while. Seems I misplaced the program manual. I have the program box but need a copy of the manual, anyone have a scanned copy they could post or PM me?
Thanks, DennisT
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OK, I got the FM9 programing instructions (attached) from Will H (thanks again). Has anyone used the FM9 as just a motor start delay and flight timer letting the ESC (in my case the CC Talon 35) in Control Line mode, Fixed RPM control the motor RPM?
Best, DennisT
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OK, I got the FM9 programing instructions (attached) from Will H (thanks again). Has anyone used the FM9 as just a motor start delay and flight timer letting the ESC (in my case the CC Talon 35) in Control Line mode, Fixed RPM control the motor RPM?
Best, DennisT
I am trying to figure out why you would want to put the RPM in the hands of a CC ESC that needs a computer to program when it is so easy to manage with the FM-9 programming box. I am sure there is a reason, I just can't figure it out.
Ken
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Maybe the $75 for the programming box?
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Have you considered the FM-9oc with pots for RPM?
Ken
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Maybe the $75 for the programming box?
Good point. Does half of what a Jeti box does for only twice the price!
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Dennis,
Look into the Climb and Dive timer here in Gettin all Amped up.
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The reason for using the CC ESC for rpm is simplicity. I have an Excel spreadsheet that I can get very close to the rpm need, when setting up the ESC I just put in the calculated rpm and done. I do the final lap time trim with prop pitch. I have been using the old Ztron timer which for setting the start delay and flight time is simple and can do very short test flights to set handle and check lap time. Lately I've been getting some inconsistent runs from the Ztron and going through the programing to set it for 100$ throttle is a pain (when I bought them I had them set up for 20 sec delay and full power). I have two FM9's and though I might give them a try so that's why my questions.
UPDATE: I found the problem with the Box, the battery holder was not making connection. I moved the battery around and the box came to life. I added a little shim to hold the battery in place and was then able to connect to the FM9.
Just to check it asked for the delay time, then the CC Talon ESC in fixed rpm, I pressed OK, it said Finished - remove power. By this I assume it will now let the ESC set the motor rpm to the value input in the three rpm sections in the ESC setup, correct?
Best, DennisT
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Dennis T
I exclusively use Castle ESC's in "Set RPM" Mode. When using the FM-9 go to the Phoenix Set RPM menu and it will ask you to select either RPM #1 (lowest RPM programed) # 2, or #3 (highest RPM programmed). I try to set the middle RPM as the "preferred" speed with the others set +100 and -100 RPM versus the middle setting. This gives a little room to adjust for conditions - which I rarely do! RPM adjustments are easy, and in exact increments, 100 RPM is a significant change.
KC asked Why Use Set RPM? Because it is the smoothest/fastest acting in governance. RPM graphs show fewer/smaller peaks and valleys in RPM. I notice the motor seems smoother, and have measured a consistent 150 mah reduction in battery usage which I attribute to smoother RPM control. Other payoffs include it self adjust to motor to motor differences in kV. That recently proved handy when I switched out a motor for balance purposes - the new RPM matched the old RPM - EXACTLY.
Primary disadvantage is that you need to reprogram if your set-up requires a new RPM higher or lower than the 3 you have programmed. That's what 1 minute test flights are for! If I am using a prop I know then the correct RPM settings can be found pretty fast. If I am testing a brand new airplane with a never-used prop I will program the RPM in 200 RPM steps to expand the range, hopefully from a little too slow to a little too fast, then fine tune the range to 100 RPM steps.
Of course for test flights you could use High Gov mode for quicker on-field RPM adjustment, then when you find one you like reprogram the Castle ESC to "Set RPM" to gain its advantages longer term.