Thread Tools
May 08, 2016, 08:43 PM
Closed Account
Quote:
Originally Posted by Jim Frahm
The only difference between the flap and aileron servo install other than the servos is the brass horn needs to be shorten a bit. I put the brass horn in a drill and then use a cutoff wheel on the dremel. It makes a very neat cut.

The fuse servo tray comes installed. The builder needs to cut the openings for their servos.
Smart idea with the drill Jim
Sign up now
to remove ads between posts
May 09, 2016, 04:21 PM
MSgt, USAF Ret.
Jim Frahm's Avatar
Thread OP
Quote:
Originally Posted by zephirus
Smart idea with the drill Jim
Thanks! Just make sure the drill and dremel are turning opposite directions.

Jim
May 09, 2016, 04:25 PM
MSgt, USAF Ret.
Jim Frahm's Avatar
Thread OP
Just about to wrap this build up. The fuse servos are installed. Now it's time to build the 2 cell 18650 pack. I'll start that next.

Jim
May 09, 2016, 07:44 PM
MSgt, USAF Ret.
Jim Frahm's Avatar
Thread OP
The is the charge lead I made so I can charge the battery with the balance lead.
May 09, 2016, 10:31 PM
MSgt, USAF Ret.
Jim Frahm's Avatar
Thread OP
Okay, the AUW is 56.57 oz with no nose weight but the CG would be 140
If you add 2.21oz to the nose that brings the CG to 120 and a AUW of 58.78oz.

I'll take some complete photos when the weather clears.

Best,
Jim
May 11, 2016, 05:50 AM
Thermal Wrangler
DrFragnasty's Avatar
Thanks for sharing the build Jim especially the battery wiring; I've got some 18650s from a laptop that could use the same treatment. 58.78oz (1.66Kg) is a great result for a 3.6m ship.
May 11, 2016, 08:43 AM
Registered User
Jim, where do you buy those cells? I've been using Samsungs which work great but are listed at 2400mah.

Great work as usual.
May 11, 2016, 10:36 AM
MSgt, USAF Ret.
Jim Frahm's Avatar
Thread OP
Quote:
Originally Posted by Bmwjoon
Jim, where do you buy those cells? I've been using Samsungs which work great but are listed at 2400mah.

Great work as usual.
Here you go: http://www.batteryjunction.com/efest-4167-flat.html
May 11, 2016, 11:20 AM
Registered User
If you want to try a higher capacity NMC cell from an OEM than your Samsung cells, you can try this one:

http://www.orbtronic.com/lg-hg2-20am...-18650-battery

I have had good luck with orbtronics. They ship all their cells in a plastic case that is protected by foam in a cardboard box. A different vendor sent me loose cells just thrown into a padded envelope. Couldn't believe it! Some of them were slightly dented as a result. . .

I'll be using the LG cells in my next build. The Efest cells are an NCA cell which are considered to be more volatile than NMC cells. Maybe not in issue in NJ or WA, but in SoCal fire hazards are a real concern. . .

You can compare tests of these 2 cells:

http://www.dampfakkus.de/akkutest.php?id=531

http://www.dampfakkus.de/akkutest.php?id=592

The value I like to look at is the capacity at 3.5 volts. I set my voltage alarm at 7 volts (3.5 per cell). So even though the Efest has more capacity down to 3 volts, the LG has more of what I would consider usable capacity.

You can see similar behavior in the popular Panasonic NCA cells that people are using:

http://www.dampfakkus.de/akkutest.php?id=609

FWIW.
Tom
May 11, 2016, 12:34 PM
MSgt, USAF Ret.
Jim Frahm's Avatar
Thread OP
Tom,

Thanks for sharing! This is exactly why I like to do build threads. Up to now I wouldn't have considered using other cells until I read the results of the tests you listed. I'll order some cells from orbtronic for my next build.

Thanks again,
Jim
May 11, 2016, 02:18 PM
Registered User
Glad you found it helpful Jim!

The damfakkus site is pretty amazing and definitely worth going through. They certainly have tested a lot of batteries of different makes and sizes (not just 18650's) and present the data in a reasonably easy to read way.

The variety of cells available is overwhelming and sites like this really help give an idea of what the cell is really capable of. You can see that some of them are really bad and are not even close to the advertised spec. Also, the way some of the manufacturers criteria for determining capacity is not practical for our use. So the usable value doesn't correlate well to the advertised spec.

Tom
Last edited by Kiesling; May 11, 2016 at 06:02 PM.
May 11, 2016, 05:41 PM
Daryl Perkins's Avatar
Jim,

Awesome build thread. Applies to Explorers too! Nice job, and thank you.

Tom, thanks for the battery help

D
May 11, 2016, 07:21 PM
MSgt, USAF Ret.
Jim Frahm's Avatar
Thread OP
Quote:
Originally Posted by Daryl Perkins
Jim,

Awesome build thread. Applies to Explorers too! Nice job, and thank you.

Tom, thanks for the battery help

D

Thanks, Daryl

I believe this applies to most of NANs models.

Best,
Jim

Final photos will be posted tomorrow.
May 11, 2016, 07:42 PM
Registered User
Wow great info, thanks.


Quick Reply
Message:

Thread Tools