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05-05-2005 11:14 PM  12 years agoPost 1
Showstopper

rrVeteran

pensacola, Fl

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There are a select few who decide to run the 6s pack. I am running a Mega 16/15/5 and a CC25. I have been flying around with a 4 s pack and everything has been fine. I decide to go to a 6s pack and the CC25 burns up. I run an external BEC and have done everything I can think of for high voltage. Nothing works. I have tried this before but I burnt my motor up. Now that I have all the right motor BEC ect. The CC25 burns up. Whats happening? any help would be great.

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05-05-2005 11:35 PM  12 years agoPost 2
Raptorsoup

rrNovice

Grand Bay, Alabama USA

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Lets see,

6 cells is over 22 volts. Lipos which are 3.7 volts/cell. The CC manual for the PHX 25 says no more than 16 cells total with disabled BEC. I believe that the cells referred to in the manual are Nicad or NIMH which would be around 20 volts at 1.3 volts/cell. Maybe you are reaching the limit of the ESC?

How much current are you drawing? Are the packs and/or motor hot?

I run 3 cell packs with a Lehner motor and have all the power I want. I might try 4 cell packs to get the current down some.

Just my thoughts,

Tim.

P.S. Neil...I just bought a Rotorworkz CF frame. The stock frame cracks easy when modded for CCPM. It should be in tomorrow.

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05-05-2005 11:43 PM  12 years agoPost 3
derrickbwg

rrApprentice

Lexington, Kentucky

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I believe raptorsoup has given you the right answer. You need a larger esc. Some folks can run amps right up to the limit and have no problems..until something spikes the amp draw and they toast the esc. Do a little checking on 6s setups and see what other guys are running for an esc.

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05-05-2005 11:48 PM  12 years agoPost 4
Showstopper

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pensacola, Fl

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Hey Tim how did you figer out that the frame breaks so easly-lol. Anyway I don't have all the power I need. I run +10 -10 and cannot get the jump that you need for attempted 3D. Anyway I just would like to see if anyone else runs this setup any what kinda speed control they are running.

PS: tim What happened. How did you break the frame. I have not been able to break mine yet. But I have not hit hard or anything yet. Now yesterday I came close to puting it in but close only counts in hourse shoes and hand grenades. lol

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05-05-2005 11:51 PM  12 years agoPost 5
Showstopper

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pensacola, Fl

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Derrickbwg. Volts up amps down. either way My pack should run really cool to the touch. Another thing I didn't even get off the ground. I clicked into my idle up mode to set the head speed and it just quit and did not start angain.

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05-06-2005 12:00 AM  12 years agoPost 6
Raptorsoup

rrNovice

Grand Bay, Alabama USA

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I was doing some hovering in the front yard and tried a piro and it drifted away from me and when I tried to recover a light post hit it.

Came out of nowhere!

I know that you draw less amps but the ESC still has to hander the power generated, i.e. watts. The manual does say no more than 16 cells (nicads) which is around 20 volts.

With my TP 2100 Gen 2 batteries and Lehner motor, running around 2800 RPM head speed (thats with my throttle curve set at only 70%), It's scary fast and powerful. My pitch is linear at -3 to +10 in normal (50% throttle, hover at around 6 degrees) and -10 to +10 in idle-up (hover at less then 6 degrees).

Tim.

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05-06-2005 12:09 AM  12 years agoPost 7
Showstopper

rrVeteran

pensacola, Fl

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Thanks for that expensive info. Anyway Tim guess what!!! we just got back from the run and while we were up there we purchased a Funtana 90 and we are going to make it electric. This is going to be cool.

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05-06-2005 12:09 AM  12 years agoPost 8
derrickbwg

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Lexington, Kentucky

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there should be a good 7-8 amp drop going from 3s to 6s but a max amp draw on 6s could be as high as 18 amps or so. I'm not sure what else could toast a motor and an esc at different times besides to much...maybe some of these smart electronic gurus will have an explanation for us.
path, I thought thats what most were using along with the cc35.

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05-06-2005 12:33 AM  12 years agoPost 9
Showstopper

rrVeteran

pensacola, Fl

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derrickbwg

first off the motor that I had burnt up was a mega 16 7 10. A 10 turn motor. I smoked that simply because I burnt the magnet wire covering off the armature wire, creating a direct jumper across the motor. Then I got the motor that everyone recomended for the high voltage 5and 6s packs. I have flown a 6s setup and a 5s setup. I was smoking my BEC's then I went to the external BEC and everything was supose to work great. No more BEC burn ups. The amp draw problem that you have mentioned is not even posible with a 1450. Ihave been flying 4s packs for 15 min. A 1450 can only pull 18 amps for about a min. So thats can't be it. A CC25 is rated for 25amps 20volts. The only thing that bothers me is that my speed control lasted a couple secs. I just had run the rotor head up to about 100 RPM and was going to go into idle up 2. I clicked the switch and the motor quit. Anyway I appreciate the help and the ideas.

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05-06-2005 02:11 AM  12 years agoPost 10
derrickbwg

rrApprentice

Lexington, Kentucky

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.

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