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Nov 15, 2019, 06:38 PM
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Build Log

Xplorer 3 4.0M


I am starting to assemble an Xplorer 3 4M and plan to document the build here. I am planning on using JR/DFA DS189HVs in the wing, S3415s in the fuse, Jeti R9 receiver, and a 2 cell Samsung 35E 18650 battery.

Alan
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Nov 15, 2019, 06:40 PM
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Here are some pictures before starting. One thing I found is the right wing tip pins do not exactly line up with the center section. Is this a problem others have had?

Alan
Nov 15, 2019, 07:19 PM
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Came up with these for servo frames.
Nov 16, 2019, 01:33 PM
Per aspera ad astra
The s3415 are too large and too heavy (30gr). https://flightcomp.com/collections/j...ini-xbus-servo
Something like a kst ms320 (21g) on elevator and a mks6110 (10g) on rudder is ok.

With the heavy 18650 battery and your heavy servos, you will be nose heavy. And keep in mind, that the ballast bar should slide over the servos as well.

/Bernd
Nov 16, 2019, 06:08 PM
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Bernd,
It looks like the ballast bars are about 2' long, how thick are the ones you use?
Thanks,
Alan
Nov 16, 2019, 09:22 PM
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I mocked up a few servo tops out of wood and a piece of wood that is 0.75" wide x 0.1875" thick and 24" long for the ballast. While things might be tight I think I will move forward with the s3415s in the fuse. For weight reasons I may go with a smaller battery. Has anyone used 18350 cells? The ones I am looking at are Orbtronics 18350 1200mAhr IMR cells.

Alan
Nov 16, 2019, 09:24 PM
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For the ballast a 0.75" x 0.1875" piece of steel is 0.48 lbs per foot, so roughly 15 ozs.

Alan
Nov 17, 2019, 10:52 AM
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I put the receiver behind the servos but my receiver was significantly smaller. Hyperion 1400 LIFE fits well for a small battery.
Nov 17, 2019, 12:25 PM
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I am finishing up an Xplorer 3, 4.0 meter wing mated to a F5J fuse. I'm not sure where to start with the CG since I find people are going from 106mm to 135mm from the leading edge based on either the F3J or F5J version. What CG range do you plan on using? I will most likely start at about 114mm and adjust it from there. At 114mm CG the AUW is 65.0 ounces.

Scotty
Nov 17, 2019, 12:43 PM
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Hi,
With X-tail 130 mm is a good starting point.
Aaro

Quote:
Originally Posted by wsmorton
I am finishing up an Xplorer 3, 4.0 meter wing mated to a F5J fuse. I'm not sure where to start with the CG since I find people are going from 106mm to 135mm from the leading edge based on either the F3J or F5J version. What CG range do you plan on using? I will most likely start at about 114mm and adjust it from there. At 114mm CG the AUW is 65.0 ounces.

Scotty
Nov 19, 2019, 08:19 AM
Mark LSF # 3792
Quote:
Originally Posted by jh2rc97
I mocked up a few servo tops out of wood and a piece of wood that is 0.75" wide x 0.1875" thick and 24" long for the ballast. While things might be tight I think I will move forward with the s3415s in the fuse. For weight reasons I may go with a smaller battery. Has anyone used 18350 cells? The ones I am looking at are Orbtronics 18350 1200mAhr IMR cells.

Alan
Alan,

I would be concerned using cells that small. IMHO, batteries are not where one should skimp. I have been using these cells in of my X3 with HV servos in a side by side staggered configuration. They are lighter and shorter than the 18650's with more capacity than the 18350's.

https://www.orbtronic.com/18500-batt...sonic-flat-top

Also, I agree about the comment of weight in the nose. Not being too sure of your servo weights you will need to, most likely, save weight with your servos. My thickest ballast bar weight is 14.67 oz. (that is what I wrote on it). It is 3/4" wide by 5/32" thick by 2' 1/16" long stainless steel. As I have mentioned in your other thread servo height will be a major factor when trying to insert the bars, as Bernd hints. To be blunt I would ditch the thought of using the s3415s servos.

Mark
Nov 20, 2019, 07:42 PM
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Mark,
I am looking to use larger batteries so I have ordered some of the Panasonic 186500s and a Jeti 6 channel rx which is a little smaller. My goal is to not have to remove or mess with wiring to remove the battery. So the rx may go under the battery and use a staggered cell arrangement. Still exploring options.

Thanks,
Alan
Nov 21, 2019, 12:46 AM
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Why do you remove the battery?
Nov 21, 2019, 07:48 AM
Mark LSF # 3792
Yep, no reason to remove the battery, just make the balance lead and a second output lead long enough for charging.
Nov 21, 2019, 03:19 PM
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I like to be able to visually check batteries for issues. I have had Hyperion LiFe packs puff even though they cycled fine. Just my preference.


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