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Old Sep 13, 2013, 06:46 AM
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Sagitta 600

Hello to all,
I'm about to help a friend scratch build a Sagitta 600, and was wondering if anyone has ever improved the original stab drive setup. I have built this model before and have never been able to get cable to run truly slop free.
Any ideas ?

Thanks,
3810
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Old Sep 13, 2013, 09:55 AM
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Have you tried a guitar string? I've done it on other glider's and it seem's to work fine. You need to use one of the wound string's.
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Old Sep 13, 2013, 02:12 PM
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Hi prodjx,I haven't tried a guitar string, I always use a bike gear cable inside the plastic tubing.
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Old Sep 13, 2013, 03:08 PM
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Yup: http://www.rcgroups.com/forums/showp...6&postcount=40
Alternatively: http://www.rcgroups.com/forums/showp...8&postcount=88

Rest of the thread:
http://www.rcgroups.com/forums/showt...itta+tip+trick
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Old Sep 13, 2013, 03:51 PM
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The hardest part of using a guitar string is possibility of having to ream out the ball end hole. I've also been known for using Sucess Rice perforated bag's in lieu of perforated film in a layup.
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Old Sep 14, 2013, 02:26 PM
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I would recommend using a belcrank rather than the bent cable. There are a variety of materials you can use to keep it lite weight. You will enjoy control authority that is a million times better than the bent sullivan cable. This is especially important on elevator.
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Old Sep 14, 2013, 04:51 PM
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Thanks for all your input guys, looks like a bell crank will be the way to go.
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Old Sep 14, 2013, 08:24 PM
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I think a bellcrank is probably a good idea. However, for the lazy, it's possible to cram in a standard size servo for the elevator. In fact, my old Sagitta 600 had three standard servos. Anyway, the standard size servo may be heavy, but it can handle more friction, and I never had any trouble. I put powdered graphite inside the tube.

I have also seen a pull pull setup with kevlar string and a pulley for controlling this kind of stab. Don't remember the details except that it used a brass tube instead of a pulley. I think the tube was fixed, not rotating. Anyway, I didn't fly it but they guy who did it seemed to like it.
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Old Sep 16, 2013, 05:20 PM
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I hope there are going to be lots of pictures posted of this scratch build???!!!!!!!
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Old Sep 17, 2013, 01:32 AM
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I' m just helping a mate, I will see if I can talk HIM into doing one
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Old Sep 17, 2013, 04:13 AM
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Quote:
Originally Posted by Phoebusflyer View Post
I hope there are going to be lots of pictures posted of this scratch build???!!!!!!!
Me also,just started on a sagitta 600 kit.Finished with rudder and elevator.May be in need for some help with the wing buildup.....
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Old Sep 19, 2013, 10:11 PM
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My suggestions for the Sagitta 600:

-make the tail as light as you can get it
-make the fuselage at the front end of the fin a little wider than it is on the plan. It tends to break here. Alternatively, you can glue a piece of wood on the outside that runs a few inches fore and aft. Preferably sanded thin at the edges so there are no "steps" in the fuselage.
-It may help the handling to make the rear fuselage just a little longer, at least if you can keep the weight down, but then again that isn't exactly a Sagitta 600.
-extend the sheeting just a little further back on the wing. Greatly reduces covering sag.
-make the tail as light as you can get it!!
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Old Sep 20, 2013, 08:21 AM
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Quote:
Originally Posted by lincoln View Post
My suggestions for the Sagitta 600:

-It may help the handling to make the rear fuselage just a little longer, at least if you can keep the weight down, but then again that isn't exactly a Sagitta 600.
Agree on both points. My 600/900 hybrid is an awfully sweet flying machine-- but because it uses a 900 fuse nobody notices it's not a pure 600 until I tell them. (-:
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Old Sep 20, 2013, 07:48 PM
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And take off the "balanced" portion of the rudder and make it part of the fin.
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Old Sep 20, 2013, 07:59 PM
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Other that taking off the balanced part of the rudder, I was going to change the air foil to a s3021.I did this to a sagitta 900 that I built about 10 years a go. The only problem I'm having is with my printer, so at the moment I can not print out the new ribs with profile. When I email the new ribs to work to print, the computer will not open them, so till I get my printer sorted, we will just have to wait.
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