RunRyder RC
WATCH
 1 page 106 views Post Reply
HomeScale✈️AircraftScale HeliRoban Scale Helicopters › Roban 700 Cobra
07-29-2021 01:55 AM  52 days ago
Topic Vote0Post 1
DCORSAIR

rrVeteran

Selma, Calif.

MyPosts All Forum Topic
💎Sustaining Member
Roban 700 Cobra
I just picked up a new Roban 700 Cobra, it was already built but not flown, it now has a Kontronik 160 ESC, MKS 1220 cyclic servos, KST 1035 tail, Futaba R6203SB rx, Microbeast 4.2 fbl controller, Life 2100mah 6.6v buffer battery, lights are on a separate system, 2000mah NiMH runs those, Scorpion 560kv for power, flies great so far, the first video is the very first hover test, the second video is the first actual flight, almost didn't go well, listen closely and you can hear the motor cut out, so I set up to auto it in but then the motor powered back up so I set it down after hovering a bit to see if it would do it again, turned out I just programmed my radio wrong as for throttle calibration in the Kontronik so I went into slow spool up was all.

Watch at YouTube

Watch at YouTube

D. Lee.....t.Born again.t.....
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
07-29-2021 10:16 AM  51 days ago
Girard Ibanez

rrVeteran

Tucson, Arizona (formally from Guam)

MyPosts All Forum Topic
On 2nd flight, were you on normal or Idle1/Stunt 1.

I'm guessing you were on normal and reduced the throttle/collective during flight so that the Cobra descended and the ESC shut off then went to soft spool up.

If that analysis is correct I would suggest you add a throttle point at approximately 15% point. That way if you reduced the throttle stick for more negative pitch you are not at the default 25% point where the ESC shuts down.

I don't use Idle1/Stunt1 or any idle up. My throttle curve is setup 0%, <~15% than flat line to 76% Governor mode at 1550 rpm. I have a higher headspeed for 2 reasons, 1) tail rotor authority and 2) to stay within the ESC efficiency range and that's with "free wheeling". Kosmik ESC Governor set to GovStore.

Team Thunder Tiger
since 6/2005 to 12/2014
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
07-29-2021 02:37 PM  51 days ago
DCORSAIR

rrVeteran

Selma, Calif.

MyPosts All Forum Topic
💎Sustaining Member
Thanks for the info, I also don't use any idle up programs, never have actually on scale anyway, I run a flat throttle curve with no govenor, so I had my end points wrong from the start, so yes when I pulled negative, it went into slow spool up, reset my end points and reprogrammed it all, now have two more complete flights on it and no problems, I have set up four of these so far with the Kontronik and just forgot to set up a new program for this Cobra....D. Lee.....t.Born again.t.....
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 106 views Post Reply
HomeScale✈️AircraftScale HeliRoban Scale Helicopters › Roban 700 Cobra
Print TOPIC

 2  Topic Subscribe

Sunday, September 19 - 2:59 am - Copyright © 2000-2021 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online