help

[Dtodt13]

i did my brushless conversion finally and im having an issue. when i spool up and it gets under load the esc and motor keep resetting. my solder joints all seem good, theres no connectors. also a few seconds after take off there is a very bad drop in power. if i keep the throttle going past that the motor will shut off completely and the esc resets.

hp05, 120sr tail motor, xp-7a, 250mah battery

here are some pics of the job.

[Dtodt13]

i resoldered the motor connection as well as put the power supply positive on the front of the board. nothing better. im going to guess its my batteries. i bought this heli second hand with the batteries so idk how used they are. i have hit LVC a number of times when i first started flying it. any other ideas out there?

also, it wobbles really hard. the boards are all stuck well so im guessing its the motor causing it? how would i fix that?

[ahummingbird]

I would double check the solder joints to the board and have a careful look at the wires just before the solder joint. it will fray and break the strands leaving only a few strands trying to carry all the current.
And yes these 1s lipo's are not as sturdy as the larger multi cell packs and can fail so try some different batteries if you can.

[NCcraig]

From the looks of what you have going there, I would resolder everything and get rid of all the wire spices. Power the ESC from the battery then power the 3-1 from the ESC. Solder the motor wires directly to the ESC. Also check that the motor is clear of the frame after modification and not rubbing anywhere. Then get a new battery or two.

As far a the wobble, it could be anything from a cracked main shaft to a bad bearing. I would get the power situation resolved first then figure out the mechanical problem.

[Dtodt13]

thanks guys. i can direct solder the motor, but i worry about the wires conducting too much heat to the motor when burning the enamel off them. as for the converter, ill have to take the prongs off. im going to try a new battery before i try getting rid of the splices. this is my first ever solder job so i dont want to mess up pieces before it even flies right.

[NCcraig]

Originally Posted by Dtodt13

thanks guys. i can direct solder the motor, but i worry about the wires conducting too much heat to the motor when burning the enamel off them. as for the converter, ill have to take the prongs off. im going to try a new battery before i try getting rid of the splices. this is my first ever solder job so i dont want to mess up pieces before it even flies right.

Don't worry about the heat hurting the motor removing the enamel. I've done it more times than I can count and never had an issue.

[Dtodt13]

Just picked up an eflite 500mah 25c with Jst connector. I'll get back with an update when it's installed

[Dtodt13]

Originally Posted by Dtodt13

Just picked up an eflite 500mah 25c with Jst connector. I'll get back with an update when it's installed

woo the power issue is solved! it flies strong now. as for the wobble, my blades werent tracking well so i put on the bulleted blades and its much more stable. theres now a slow wobble looks like its coming from the tail. i have the 120sr rotor on there that ive cut some off so thinking maybe its not balanced i put the stock rotor on it and it improved slightly. not enough to really fly it though.

[JonJet]

Using the stock 120SR tail rotor with a BL main and 120SR tail motor is not going to give you any tail authority...

Use the RCC 65mm prop in CW rotation

[Dtodt13]

Originally Posted by JonJet

Using the stock 120SR tail rotor with a BL main and 120SR tail motor is not going to give you any tail authority...

Use the RCC 65mm prop in CW rotation

yes but first id just like it to have a stable hover lol.

[JonJet]

Of course...but without the tail authority of the RCC 65mm tail prop, you won't get a stable hover...

Kinda like wanting a smooth idle with an empty tank

[Dtodt13]

Originally Posted by JonJet

Of course...but without the tail authority of the RCC 65mm tail prop, you won't get a stable hover...

Kinda like wanting a smooth idle with an empty tank

well i just balanced the tail with a small piece of tape and the wobble is gone. theres a wobble now when i let off the throttle and it decents, just like the problem they have out of the box. i think that has something to do with the swahplate being loose right? and im going to have to get new blades because my non-bullet ones are ate up and i think the high head speed mixed with chopped up blades doesnt mix.

[Dtodt13]

its also a very windy day today in kansas so im limited to indoor testing

[JonJet]

If the bullet blades are ok, I'd just use them...more stability is better with such high headspeeds

But you need to solve the tail authority issue

[Dtodt13]

Originally Posted by JonJet

If the bullet blades are ok, I'd just use them...more stability is better with such high headspeeds

But you need to solve the tail authority issue

i really dont feel any issue with the tail authority.. yet. ill have to test it outside with flips and stuff. but hovering around it feels fine. now its time to trouble shoot the wobble on decent

[JonJet]

Yep...the stock mCPX tail feels fine "hovering around" too, remember?

But time will tell

[Dtodt13]

well i cleaned the servo contacts, tightened everything down, and put a new piece of 3m tape on the esc. the non-bullet blades still cause death wobble, and with the bullet blades thers a tiny tail wobble. i think with a rcc 65mm tail rotor and a new set of mains it should be all good. i took it outside and did one flip despite the heavy wind gusts and it feels awesome.

[daveapplemotors]

Hey Dtodt13.
Could your mainshaft be the trouble?

[Dtodt13]

Originally Posted by daveapplemotors

Hey Dtodt13.
Could your mainshaft be the trouble?

I treableshot the whole thing last night and everything seemed to check out fine