Mini K-Bar

smoke · Post by **smoke** » Thu Mar 12, 2015 1:00 am

Well I made the changes the cc bec has not arrived so I did the rewire using the internal bec. I now have the esc going straight into the kbar. Checked everything out it all worked like it should. The real test will be Sat morning. Again guys thanks for all the help.

Tony · Post by **Tony** » Thu Mar 12, 2015 9:44 am

Hope it flies like a bird mate... Good luck

smoke · Post by **smoke** » Mon Mar 16, 2015 1:05 am

Even after rerouting the wires. Still losing power. I just finished going trough all the wiring I don't like the connection between the esc and batt plug. I will replace the plug and try that. Then if that don't fix it. I will add the cc 10a bec. (just don't want bec on the 450 but if I must so be it)

Tony · Post by **Tony** » Mon Mar 16, 2015 12:40 pm

Well if you try the 10amp ESC and it fixes it then you know where the problem lies... If it doesn't fix, then at least you've eliminated the 5-6 volt side of things... What about the motor itself... Is that ok?

Superbad · Post by **Superbad** » Sat Mar 21, 2015 3:02 pm

I have been doing some reading on the Vstabi web sit and came across why the Vbar (kbar) shuts down
it is do to the servos back feeding in to the unit

Mikado did testing and found that a 6800uf cap cures the issue of backfed voltage and current spikes

you can also use a 4700uf cap

smoke · Post by **smoke** » Sat Mar 21, 2015 6:03 pm

Thanks for the info.My question is do you just plug the 6800 uf cap into an open channel on the rec. If so I have one plugged in already but it only 3300uf that may be my problem. Even putting the cc bec on didn't stop it from cutting out. Funny thing if you are high enough when I cuts out power will come back soon enough to recover b4 a crash. I definitely will try the cap thanks again.. To reply to you Tony as far as the motor. Have tired different motor still same thing.

Superbad · Post by **Superbad** » Sat Mar 21, 2015 6:31 pm

Mikado says 6800uf
But there is a guy testing it on a bench with the 4700 he says he cant get it to brown out with it
He was doing this for a smaller heli and said the 6800uf was just to large in size for the micro heli
And from what I get its plugged in to a open port on the V bar (kbar)

smoke · Post by **smoke** » Sun Mar 22, 2015 2:44 am

I will try 4700 also and see what happens. Thanks again..

smoke · Post by **smoke** » Mon Mar 23, 2015 1:17 am

Well I spent all morning reading all the info I could fine about the brownout issue I keep having. Seems to me a cap sould fix the problem. Just for all of you to know that's trying to help me with this. Using standard rec connection no sat or anything like that. So I made a y cable so I can connect the cap into the kbar. I made the connection at rxb so the cap connects there . So now I have 2 set of power wires going into the kbar plus the cap. Its got to work now. lol ( I hope)Until I get this figured out I'm afraid to fly the 500. I guess I could get the Ikon I like it anyway. Just want to wait until I am better pilot first. b4 spending that kind or money.

Graham Lawrie · Post by **Graham Lawrie** » Mon Mar 23, 2015 1:24 am

I am the same. i test the "death" out of anything before i feel safe:) the hardest restriction on this hobby is the expense ££$$.

smoke · Post by **smoke** » Mon Mar 23, 2015 1:35 am

Well I just keep working at it with all the help I'm getting from everyone we'll get it worked out .

Superbad · Post by **Superbad** » Mon Mar 23, 2015 3:32 am

Its not a sat problem I have read even people with regular RX having the problem also
It is all going back to servos back feeding in to it causing the shut down .( is How i have been reading it )
and it seems not to happen with BL servos
I have not seen this happen on any of my Helis 1 has align servos 1 has JR servos and the last with KTS servos
Might be time to just get a a little bit better set of servos
If I tear up my KST servos I think Im going to try out some OMG servos

smoke · Post by **smoke** » Mon Mar 23, 2015 4:07 pm

Maybe a set of kst215 is what I need .The turnigy 306g is what I am running now . I was thinking they were the same as the kst. idk.

Tony · Post by **Tony** » Mon Mar 23, 2015 4:52 pm

this has just rang a bell for me... when i had my 450 i had the 306 servos with the mini Kbar and occasionally it would lose power. i didnt think much of it at the time, just gave it more throttle... Lee flew it at Tarifa and found the same thing. we thought it was a bad connection...

anyway, i dont have the heli now, but i do still have the electronics, so my thought is to rig it all up on the bench and do some tests, i have a storage oscilloscope i can put the 5 volt supply on to monitor and see what i come up with... i will certainly let you know if anything crops up... and ill sort a solution out....

those 306's i have i had to take them to bits and put insulating tape on the PCB to stop it shorting..... have you done this??

smoke · Post by **smoke** » Mon Mar 23, 2015 7:59 pm

Tony I really appreciate all this effort you guys are putting out for me. See this is why RC Hangout is the best!!!! Yes I did insulate them b4 I ever put power to them ..

Tony · Post by **Tony** » Tue Mar 24, 2015 11:27 pm

hey Smoke, ive done some tests with my setup and not finding any spikes in the 5 volt supply, i have all 4 servos connected up and even when i put a load on them and twiddle around with the cyclic stick theres still nothing of concern, i get a 40-50mV ripple in the supply which certainly would not cause brown out..

can you tell me how you have wired it all up, i think there was some confusion on this earlier... wires from Rx A, B, C to receiver and wire to ESC. i will do mine exactly the same and try again...

im using a Hobbywing SkyWalker 40 Amp esc with a 3amp Bec. 4 x TGY306 servos, Kbar Koala (the Blue one) and an AR6200 Spektrum RX

cheers bud

smoke · Post by **smoke** » Wed Mar 25, 2015 12:27 am

Ok frsky V8R7-II hv rx yellow kbar rxa goes to ch1 ail ch2 ele ch4 rud, rxb goes to esc and the signal wire from esc goes to ch3 for thr but the sig from rxb goes to ch5 gain, rxc puts power to rx and the sig goes to ch6 for pitch. ch7 and 8 not used. Having a hard time explaining this hope you understand it .. Thanks again Tony. Almost forgot it 40a YEP esc

Tony · Post by **Tony** » Wed Mar 25, 2015 9:04 am

thanks Smoke, its wired more or less the same as mine, although i do have a different RX and Kbar (Blue one). the 5 volts is pretty much rock steady on mine and thats with a lot of pressure on the cyclic servos. so unfortunately i cannot duplicate your problem which is a bummer as id of liked to sort this issue out...

smoke · Post by **smoke** » Wed Mar 25, 2015 12:34 pm

Hey Tony thanks for the effort.

Tony · Post by **Tony** » Wed Mar 25, 2015 10:13 pm

Sorry I couldn't help mate, I even took RX off my quad to set it all up....

Did you do the mods to the 306 servos, can't remember if you answered that..

RC-Hangout

Mini K-Bar

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