Hacker B40 9L 70A 1000W regardless of timing - RC Groups
Thread Tools
Jul 18, 2006, 06:31 AM
Neil Jarvis
Neil Guildford's Avatar

Hacker B40 9L 70A 1000W regardless of timing

Can any one help?

I've a Hacker B40 9L running in a DS-30 fan with Hacker OPTO 77 and 4S 4200 TPs.
It was previously run on 5 Deg timing ....results
42A, 600w ish

I advanced it to 15 deg and saw
70A 1000+ watts

I then lowered it slowly back to 5 and saw no change in settings from 70A.

These tests were all done on the work bench with a watt meter and run for only a few seconds.

Can anyone help with this one? Is this a result of a demagnatised motor or something else?

Sign up now
to remove ads between posts
Jul 18, 2006, 10:01 AM
Julian T
Hacker inrunners are 2 pole and require little if any timing advance - I usually set mine to 2 degrees and they seem fine on that. I would have thought 5 was a maximum advisable advance. However, if you only ran for a few seconds demag as a result of overheating seems unlikely. Have you measured rpm to see what you are actually generating power wise? Are you certain you have reset your controller back to the lower advance? If you dropped the advance in stages and kept retrying the motor may not have had a chance to cool between runs and died prematurely as a result.

Jul 18, 2006, 11:14 AM
Neil Jarvis
Neil Guildford's Avatar
I don't think it got all that hot. The whole test took me nearly an hour with cups of tea between.
I am wondering if the ESC is behaving and if the timing has actually altered.

I know of other people running B50's at 25 deg timing with no difficaulties so I think its more of a max amp/watts issue converting the inefficiencies to heat that cause the problems.
Mine seems to be stuck in 15 deg timing mode. That would point to the ESC. I'll try another esc tonight but expect it to be a motor issue.
Jul 19, 2006, 05:13 AM
Julian T
Ok. Good luck - I would be interested to hear what you discover.

Jul 20, 2006, 11:11 AM
Neil Jarvis
Neil Guildford's Avatar
I tried a test with a different hacker 77 opto esc and got the same results.
67A, 980W to be exact.

This points at the motor for sure now....I'll email Hacker and see what they say.

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
How many and which cells for a Hacker B40-9L? Drivie Electric Heli Talk 8 Sep 11, 2003 08:54 PM
FS: Hacker B40-9L caesar95 Aircraft - Electric - Airplanes (FS/W) 1 Aug 21, 2003 11:03 PM
F/S hacker b40-9l and Kontronik smile 40-6-12 and Charger Terkan Aircraft - Electric - Airplanes (FS/W) 17 Feb 13, 2003 03:12 PM
Kyosho EDF/Hacker B40-9L and Master 70-3P OR Jeti 70-3P? TGoodwin Electric Ducted Fan Jet Talk 26 Jun 11, 2002 02:44 AM
Voyager And Hacker B40 9l ERGO60SX Electric Heli Talk 1 Feb 04, 2002 11:49 PM