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GREAT PLANES EXTRA 300S, 60 SIZE, ELECTRIC CONVERSION, 2019 BUILD ALONG

nhk750

Aviation Enthusiast
Got the elevators sorted out and ready for some soldering on the Golden links. Im trying to figure out the pull pull rudder now using fishing line to check my wire runs. From my research you dont want the cable to touch anything, so I am using the dremel to clean out the run a bit and I may have to add a little support as Im grinding one of the formers away a bit.
 

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nhk750

Aviation Enthusiast
I'm still learning a bit here. I worked on the setup some more and finalized my geometry. Since I have a very narrow window for the cables to run out the back of the fuse on this plane I had to cross the cables, ideally you want a parallelogram ( both cables the same length, not crossed and both servo and rudder horns the same length). But, when crossing the cables I have read it's recomended to use an offset arm (towards the tail) to help keep the cables at a 90deg angle to the servo pivot point. I read this in a few articles and manufactures recomend this too. My servo and rudder horn arms are about the same length. I ran the program and also hooked everything up with fishing line tight and it all works good. According the the program I should only have 0.003" of slack and it does seem that way. I cleared any wood out of the way of the cable runs and it looks good too, although I'm not sure if I should glue in some reinforcements where I ground the formers away. My brain is tired now, so I'm calling this one good enough.
 

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Joker 53150

Mmmmmmm, balsa.
Mentor
It's *probably* ok as-is, but some CF CA'd in there certainly wouldn't hurt. Are you going to add some type of material for the pull-pull lines to exit the fuselage cleanly? I've used short section of pushrod tubes for that in the past, which helps keep the cable from hitting the covering.
 

nhk750

Aviation Enthusiast
"They" say to have the cables as free as possible and not touching anything, so I'm centering them in the slots and leaving the slots open as possible when covering. That way the cables will have ample room to move about and this will also allow some extra air venting in the rear. It may deter from the "scale" look, but it will be functional.
 

nhk750

Aviation Enthusiast
Got the Extra on her feet for the first time and beginning to sort out all the electronics. I realized I did not have a radio for it yet and had to get a Spektrum AR6600T on order. I'm also going to use the Castle Creations telemetry link as I did on my Super Dragon build and I like how simple it is and how it gives you very accurate ESC temp and voltage reading. I just need to remember how the throttle power wire and where it is disconnected when using this set up. I guess I can take the Super Dragon apart and see what I did in there if I cant figure out the wiring...I just cant remember for some reason...

Soon I will have a picture of it in the bones and ready to cover. This getting the house ready to sell business is really messing up my build time though...
 

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nhk750

Aviation Enthusiast
Im working on hinging the ailerons and servo linkage now, when thats done the plane will be ready for full assembly in the bones and covering will be next. I still need to glue in a battery tray, but that will be easy and straightforward, I’m waiting for the radio so I can check balance before installing battery tray so I can shift things around if needed. We are going into full “sell the house mode” and progress may halt on this project for a while.
 

nhk750

Aviation Enthusiast
Got the Extra finished today, now just need to make a battery tray, solder some Golden clevises on the linkages, paint, apply Ultracote and decals.
I used some Sullivan ball links on the aileron servos and I like how that came out and got nice 90deg angles on the control linkages, then got the Extra all up in the bones. The weight is at 2900 grams (6.393 pounds) with no battery, battery tray, radio or covering, so I think it will be around 7.5 lbs when all done which is the heavy side of the scale, but thats ok as it will have plenty of power.
Unfortunetly, I need to pack it up and postpone the finishing process as we are gearing up for a move and the house is going on the market in two days...to be continued...
 

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jaredstrees

Well-known member
She's a beaut! Good luck with the move as well. My house goes on the market March 15th, and I know what you mean about the getting the house ready to sell insanity. I haven't touch my build pile in two weeks.
 

nhk750

Aviation Enthusiast
It is a challenging build and I’m not sure I like the build design, but the end product is nice, just be careful as the sheeting is easy to damage with no covering on yet.