My SSE project is just about done. All I have left to do is final assembly of the main landing gear and final installation of the electronics (receiver, EEC, BEC). I also need to order a set of batteries so I can do a final balance.
I polished up the main gear bracket and clear coated it yesterday. I was unhappy with the look of the clear coat though, as the polished aluminum seemed to lose much of its luster under it. The only reason for the clear coat was to protect the shine, so I stripped it off with a bit of acetone and buffed the aluminum back out again. This time, I put on a simple coat of carnauba wax to protect the aluminum finish.
I also painted the wheel pants white. I was happy with how they came out, until I came back to check on them and found a hair settled into the paint on one. I will see how it looks after the paint fully dries, but I am likely to do a little light sanding and add one more coat of paint to both before final assembly.
I have not been out flying yet this season and I want to get some stick time on some of my old standby birds before trying a maiden on the SSE, so for now, I will move onto my next build.
With my SSE project nearing completion, I cleared off some bench space and kicked off my next build, a Sig Hog Bipe. I will build it as a “fantasy scale” early Army Air Corps plane with the blue fuselage and yellow wings color scheme. I am also thinking about some sort of custom cowl instead of the traditional Sig style open nose.
Of course I am planning an electric conversion. Sig calls for 6.5 – 7.5 lb all up weight and a 0.60 sized glow motor. For electric motor sizing, I’ll round up to an even 8 lbs and plan on 150 watts per lb, which will put me right at 1200 watts. I want to keep with 6S batteries (22.2v), which will then need to draw about 54 amps.
I like to have the motor on had when I start the build, so I can use the motor mount as a template to drill mounting holes in the firewall before assembling the firewall into the fuselage. I am leaning towards a Cobra C-4130-12 motor. Their site includes a prop chart which lists about 1120 watts with a 13×6.5 prop and just a tick under 1200 watts with a 13×8. The 13×8 prop (drawing 54 amps), is just a bit over the 52 amp continuous limit for this motor, so as long as I am not flying max throttle all the time, I should be in a safe zone.
Battery capacity may be an issue though. I am hoping to use the same batteries here as my SSE. For the SSE, I want to keep to 4000 mAh maximum in order to keep to a reasonable weight. But 4000 mAh may not give me enough flying time for a heavier plane drawing higher current. As always, there are trade-offs with electric set ups, and I need to digest on this a bit before I make my final selection.
Since I have not finalized motor selection, I will get started on the wing panels now. Given my slow build rate, by the time I am done there, I will have settled on a motor and have it in hand. I will be back traveling again this week, so I won’t even be able to start until the week after, though.