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While I was doing this I had sent an email to Andreas asking if the 122" Extra 330SC could have the hatches installed by the factory. I was jealous of the new 102" Extra 330SC that already had them installed. What I didn't realize is that on the 102" plane the servo attaches to the hatch. I wouldn't want that on this size plane with the size of the aileron we're pushing with 500 ounces of torque on a servo. Here is the information from Andreas.
~~~~~~ The servo access of the 3.1m is of completely different nature than of the 2.6m. On the 2.6m the servos mount to the hatch and the hatch has to be mounted structurally strong to the wing skin. On the 3.1m such a hatch design is not necessary. It neither has to carry any load, nor has it to be removable quite often for access. That is because the servos are mounted structurally sound in the ribs. For the large ailerons this is definitely the better engineered way to mount the high torque servos. For access, we always lived the philosophy that an Xacto knife can solve this problem in literally 20 seconds. Put a square of masking tape (maybe 3" x 3") on the area where you want to open the access, draw a pencil line on the tape precise enough to follow with an Xacto knife. Then poke the knife in, cut along the line (it will cut the foam sandwich like butter) and pop the hatch out. Remove the tape. Done. I guarantee this doesn't take more than 1 minute. And it doesn't add a single gram to the structure. Once you have installed and set up your servo, you take the hatch and press it into its old position. You will see that you barely need to hold it with anything because the knife cut hasn't left any gap, so the hatch is held in place. You can take a thin, high quality clear tape from the office supplies and stick it on top of the cut and that hatch isn't going anywhere unless you want to take it off for servo maintenance. You barely see it, it doesn't weaken the structure, you haven't added weight except 20 cm of clear tape, what more do you wish for? And it took a few minutes at most. The ones who want to mount the servo without a hatch can still do so. In Europe there are quite a few. ~~~~~~ Excellent information from the designer of the plane. Thanks, Andreas!! I see why it's optional and see why it can be just a quick access and tape it back on. I think Andreas suggesting to cut through the masking tape is a great tip. That may keep the line a little cleaner. I would still add a couple small balsa blocks to hold it in place while you tape the hatch back on. Perfect!! |
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awesome assy as usual Dean!!!
if I ever have money again... this might be a successor to my SX!! What Tx are you using? |
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The first of the "New 2013 series modifications and improvements" is the "Aileron hinging". I asked Andreas what that meant. He told me, "Previously it was one long hinge pin through the center hinged aileron. The aileron therefore had to have a long spar. Now it is 4 separate hinges with only short pins, no spar anymore. The aileron is not so easily removable any more but it saves approximately 100 gram in each wing."
Cool. Since I'm shooting for no less than 41 pounds and no more than 42 pounds, any help from the designer to save weight is good. A little over 7 ounces removed from the plane. When I asked Andreas about the "4 separate hinges with only short pins" he told me, "the short tubes are squeezed with a pair of pliers on both ends, when installed, so that they actually press slop free into the outer bearings. That way they can't create wear because there is no movement, and they will not be able to slide out. We were testing this method the full last year's flying season with Niklas Roth, a young German pilot." Here are the pictures of the "4 separate hinges with only short pins". |
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I'm using the AirWild Hobbies MLP servo arms on this plane. I chose the 1.5" arms since I'm only looking for 25 to 30 degrees maximum throw on the ailerons.
I drilled at tapped them at 1.25" just in case they end up with too much throw. |
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