ORIGINAL: OhD
ORIGINAL: OhD
I tried the logrithmic curve on the Spin 99/DualSky combination and at first thought it was worse as far as rough startup. However I can see if you start it aggressively it will always start in the right direction so it might work better for geared motors. Then I tried the exponential curve. It is the softest start of all but will start in the wrong direction some of the time. However it has by far the best idle and smoothness coming off of idle. I had it running at 200 rpm. Almost as good as my new ceiling fan. I don't know what that curve looks like so I guess I'll have to map it if I get a tachometer working.
Jim O
I tried to fly with the expo curve today and knew I was in trouble when it took 1/3 throttle to taxi out. The flight was terrible. It was like flying a two stroke with no mid range power. I might be able to compensate for it with the throttle curve in the transmitter but didn't try today. The idle was great and I only used 2694 mAh for the Master's sequence but it is not the way to go.
I went back to linear on the next flight and thought I heard a couple of cutouts during the flight. On the third flight I heard something on the bottom of the Figure M that sounded like something broke. I throttled back and landed okay but it looks like there is still something wrong with the Spin 99s. Is there any success stories with the Spin 75? I really like the data logging feature on the Spins.
Jim O
Jim,
I ran the Spin 75 for awhile but was having some of the same issues you describe with rough start up as well as the idle not being consistent. While I liked the data logging features, I found the volt and amp readings to be unreliable, rpm seemed fine. I did like the programmability features like acceleration, timing, etc. I played with timing from 20 to 30 degrees and funny thing, I ended up at 24 degrees as the setting I thought ran best all around. Guess what, 24 degrees seems to be the default setting on the Jeti Opto Advance 77 and 90 so in my case, the timing programmability didn't buy me anything but I still got to play with it ;-)
I also had a problem with the motor hesitating in the air as I did throttle ups for verticals. I thought I could hear it happening and the Eagle Tree Data Logger proved it was happening so I finally gave up and sent it back, traded it in for a Jeti 77 Opto Advance. I had an early version of the Spin and I would assume there were some programming, recording issues to be worked out. I kept the programming box since I assumed I would end up buying another Spin when the bugs were worked out and I liked some of the features in the box like pulse width and servo test so I kept it.
I also tried exponential for one flight and went back to linear. I use throttle curve on the transmitter programming to shape power response and am happy with that.
How's that Dualsky working out for you? Mine runs great and a couple other guys up here are trying them out. Jerry B is also runnng one now. Mine pulls about 65 amps on a 20x13 and I have all the vertical and speed I need for a 11 lb plane. Can fly the P07 sequence at under 3500 mah at 150 meters and large maneuvers.
Don