I am putting together a Modeltech extra 300L ARF and I have a question about the control arms that mount the flaps. I have 2 control arms that are substantially larger than the others. Do these go on the ailerons, elevator or rudder control surface?

anyone??

I built one these a few months ago. I'm at work right now. If you can wait until tonight, I'll go look at mine and get back to you here.
BTW, do you mean the Magic Extra 300L or the Extra 300?


Joe

Magic extra 300L

You mean the control horns ... I guess ... okay ... the ones for the rudder are larger and also the same, you attach them as a pair. Hence, 2 horns on one control flap.

The rest (ailerons and elevators) are a combination of one horn and one square backing plate. Remember the small nuts are for the rudder control horns!

Yep!!!! I just went to look at mine and that's exactly the case.

BTW Chris, run the control rods first and see where they line up. Then attach the horns. This worked great on mine. No binding. You're going to love this plane.

Joe

The one thing about this plane is that the fuselage is fragile. I had a good time flying mine over the last couple of days, handles nice but you will need to add some down thrust, I added 2 small washers (like those used for the under carriage) to the top of the engine mount.

True, I added balsa and CA to make mine stronger. I had a really hard landing (wind gust came and went on landing) and did no damage except for a broken prop. It's true that's it's fragile but it's also very light. A little balsa and CA in the right places and it will be much stronger. Also put CA on any joint that you can access. It makes it a lot stronger and adds hardley adds any weight (grams).

I'll check my thrust the next time I'm out flying, thanks.

Joe