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Electric Stunt => Gettin all AMP'ed up! => Topic started by: Mark Mc on March 22, 2018, 02:02:20 AM

Title: SIG Akromaster kit bash
Post by: Mark Mc on March 22, 2018, 02:02:20 AM

I have most of a SIG Akromaster kit left over, and I have an idea for an electric trainer I want to do.  I’m just trying to decide which power system to use.  Brodak has two power systems that I could go with, but I can’t decide which to use.  The website shows an EPS-15 and an EPS-18.  Both use the same 18 amp esc, FM-0c timer, 3S 1800MaH battery, and 8x4E prop.  Only difference is the motor.  The EPS-15 uses the Arrowind 2210-25 at 1560KVA, and the EPS-18 uses a Black Magic 2215 at 1180KVA.  Also, an 18A esc seems a little small.

(https://s5.postimg.org/f0bh97qjb/Capture1.jpg) (https://postimages.org/)

Opinions?

Mark

Title: Re: Power system for a SIG Akromaster kit bash
Post by: GERALD WIMMER on March 22, 2018, 04:22:41 AM

Hello Mark I would be going for the EPS18 but with a 30amp ESC.
 Have a similar sized model (Aeromodeller Mirabilis) that is only slightly larger, that is 22.5oz ready to fly with a Apache APM30-18T 905Kv and uses a 3S 1600Mah 3cell and ground scraping 11x7 prop which flies out the F2B pattern nicely and with a few laps to spare.
Regards Gerald

Title: Re: SIG Akromaster kit bash
Post by: Mark Mc on April 07, 2018, 08:17:26 PM

Well, cleaning up my work table showed that I already have the specified speed controller, timer, and three props for the above systems.  Since I have the other stuff, I went ahead and bought the motor and two batteries for the EPS-15 Sport package from Brodak.  I have most of an Akromaster wing kit, some rock hard elevator and stab pieces, and a heavy plank of a fuselage, so I made up a working drawing for a full fuse plane. 

(https://s5.postimg.org/8hxff0sef/Plans.jpg) (https://postimages.org/)


The fuselage was drawn to the width of the BH-1877 battery and BH-1836 motor.  The medium 1/16” balsa sided fuse will be built around a 3/16” balsa crutch with 3/16” cross pieces and 1/16” sheeting top and bottom.

(https://s5.postimg.org/5nua1kasn/Crutch.jpg) (https://postimages.org/)
(https://s5.postimg.org/5nua1kiif/Sides.jpg) (https://postimages.org/)


I cut a new stab and elevators from decent wood, and mildly re-profiled the fin and rudder.

(https://s5.postimg.org/l9bllj9w7/Tail_surfaces.jpg) (https://postimages.org/)


I bought some more 1/16” sheet and a roll of yellow covering this afternoon to continue the build when I get some time.

Mark