Issue with Koby 40

[vertico]

So i have this set for heli mode 4, simple enough. When I spool up into a hover at about 2900 rpm (50%) on my 450x I am flying smooth and fine. Anything else greater the heli spools to the higher rpm for about 1 sec then reduces power, spools back to the higher rpm again, reduces power again. Over and over. It does not do this on the ground (odd)

Any ideas?

[dl7uae]

So, what is the difference between hover and standing on ground? Let's think...

Ahh, collective pitch --> motor current --> voltage level depending on battery's IR?

What happens on ground with negative collective?

[vertico]

Originally Posted by dl7uae

So, what is the difference between hover and standing on ground? Let's think...

Ahh, collective pitch --> motor current --> voltage level depending on battery's IR?

What happens on ground with negative collective?

To be honest I don't have a clue what you are suggesting because I understand how a collective pitch heli works. It's not like my RPMs were dropping a little, it was hitting 3600 RPM IN THE AIR and then while in a stable hover DRASTICALLY drop to 2900 then back to 3600, rinse and repeat all at 50% throttle. It would stay at 3600 rpm for about 5 secs before dropping back down to 2900 which would then slowly creep back up to 3600.

My issue was resolved by lowering the pinion which allowed me to run a higher throttle setting. It seems the Koby did not like running that low of a throttle with my Scorpion 2221-6.

[Seasick78]

Just curious... What FBL system are you using in this model? And what radio?

[vertico]

Sorry just noticed your response.


This is with my ikon, Scorpion 2221-6 on 450x w/ DX8 and it's actually still doing it.

It baffles me, If I spool up on the ground and flip into idle up while on the ground it is fine at first then when I get into a hover it starts doing it, over and over again. However, If I spool up in normal mode, come to a hover and THEN flip into IU no problem and it's rock solid. I don't get it. I'm glad I found a work around albeit I don't really understand it.