Originally Posted by
Gray Beard
This is a bit odd, I was using the 4*60 to teach building and the nyrod or clear plastic rods in the red tube is what we often used. I now live in Vegas and fly from a dry lake bed or asphalt runway. It goes from the 20s to about 115 here so you could say we have a temperature shift and the plastic rods don't create that much of a trim change. I'm from Tacoma and now what Washington is like and if your trim is shifting more then a click or a beep or two you have another problem.
If the outer tube isn't glued in tight all along it's length about every 6 or 8 inches it will allow the rod to shift and it will change the trim but your temperature doesn't get hot enough to be a big problem.
You can change out the nylon rods and use metal without any RF problem. I have never had any type of RF hit with a glow engine, even with AM or FM. I did with gas powered planes but trhat was before 2.4.
My outer tube is glued well in the airplane. As an experiment, I placed my Sig 4 Star out in my driveway in direct sun light for about ten minutes w/out the wings on. The rudder and elevator were centered when I placed it out there.
10 minutes later the rudder was bent to the left and the elevator was up. Neither by a lot but noticeable to the naked eye and enough to cause a trim change.
In my kit build instructions, Sig even warns about this and says to make sure the trims on the elevator and rudder are paid attention to because of the plastic rods.
I have a gas 15cc engine on it.
Can I just remove the inner plastic tube and replace it with 4-40 pushrods even though they are not as tight as the inner plastic tube was?