total loss of performance HELP!

Coyote · February 11, 2014, 12:57:36 PM

Could it be your lipos are damaged and dropping their volts under throttle being applied ?

FPVSteve · February 11, 2014, 01:20:00 PM

^ this .... stick a voltage monitor on the balance port and watch what happens when you increase throttle (with a prop on for loading).

lrosm · February 11, 2014, 02:48:01 PM

i have put one on my two batteries

1800 3S

No 1 4.19
no 2 4.22
no 3 4.16

all 12.5v

2200 3S

No 1 3.96
No 2 4.00
No 3 3.96

all 11. 9v

lrosm · February 11, 2014, 02:48:43 PM

NB

sorry this was the load of my batts unconnected.

lrosm · February 11, 2014, 02:51:54 PM

on my 1800 3S on full load my voltage drops to 11.6

off load 11.9
on full load 11.6

lrosm · February 11, 2014, 02:54:14 PM

my 2200

offload 12.4
onload 12.1

so all looks good there.

lrosm · February 11, 2014, 03:00:20 PM

just double checked my prop is on with the numbers facing fwd towards the cockpit.
i am going nip out & have one more go now!
standby!

chris-s · February 11, 2014, 03:23:00 PM

Quote from: lrosm on February 11, 2014, 03:00:20 PM
just double checked my prop is on with the numbers facing fwd towards the cockpit.
i am going nip out & have one more go now!
standby!

OK, well thats right then. Check the hub aint cracked, thats what prompted me to replace mine, it was fine one week then the next week it "wasn't right", turned out the hub had cracked, it flew but badly, then of course in haste I put on a new prop, the wrong way, and it wasn't much better - duh!

Chris

FPVSteve · February 11, 2014, 04:09:22 PM

Potentially failing ESC or bad solder joint which can't handle the current draw.

Loopdreams · February 11, 2014, 04:13:31 PM

Reckon it's still not calibrated properly. If something was ok until you changed something then it's likely to be related to the thing you changed.

lrosm · February 12, 2014, 01:02:56 PM

well that didn't go well!
still no real power & unfortunately hit a gust of wind just as I took off, flip it backwards & nose down. shattered the plane nose completely. already had one rebuild but shattered at these weak points again. not sure if i can rebuild this time.

on HK now for a bixler2 shell & think i will rebuild!

cheers for all you input everyone.

Coyote · February 12, 2014, 04:03:27 PM

Fit one of these:

http://www.hobbyking.com/hobbyking/store/__29440__NTM_Prop_Drive_28_36_2200KV_696W_UK_Warehouse_.html

Then don't worry about power :) If it needs an ESC put a Turnigy Plush 30 amp in or a Plush 40 if you want to go 4s with ridiculous amounts of grunt :)

Job done :)

lrosm · February 12, 2014, 10:33:22 PM

hi coyote,

that is exactly the motor I already have! i was planning on upgrading the orig bixler. so will put this motor on the new one. i have the 30amp ESC too! this motor will push my bixler nice & high for my FPV!

cheers.

gtv · February 13, 2014, 07:11:44 PM

Quote from: Coyote on February 12, 2014, 04:03:27 PM
Fit one of these:

http://www.hobbyking.com/hobbyking/store/__29440__NTM_Prop_Drive_28_36_2200KV_696W_UK_Warehouse_.html

Then don't worry about power :) If it needs an ESC put a Turnigy Plush 30 amp in or a Plush 40 if you want to go 4s with ridiculous amounts of grunt :)

Job done :)

whats the battery life though with that? I quite like to run times out of my stock motor, but it is lacking in power.

Coyote · February 13, 2014, 07:21:08 PM

It was Dakarsg who flies with it on his Bixler, he got very bored before he had to land but hopefully Stu can reply with a flight time figure.

The motor had loads of power, but also meant that when not gliding you could cruise at much lower throttle than with the stock motor so if was pretty efficient