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Balsa USA Stingray 120

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Old 04-12-2014, 06:22 PM
  #51  
bicyclemonkey
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Originally Posted by balsa brain View Post
Where did you get the landing gear from?
I got it straight from Sig. It's a Four Star 120 landing gear.

The manual calls for sheeting over the top of the fuse behind the firewall. This area is normally for the fuel tank but will be the battery tray if I go electric. I'm making a hatch for it. Either way, glo or e-power, it will be handy to have access.


I just need to whittle it down and sand it into shape.



I need to add a couple more formers/supports.



This part is permanently attached to the top center of the wing. It'll form the cockpit and stop where the instrument panel would be.

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Old 04-27-2014, 09:37 AM
  #52  
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I've been dreading the whittling!



Turned out ok.



The hatch!



Makes life much easier!

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Old 04-27-2014, 12:52 PM
  #53  
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I ended up taking a wood carving class when it was offered at my wood workers club. The class made balsa carving hatches and wing tips a bunch easier. Just having the correct carving knifes on hand is a big help.
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Old 04-27-2014, 01:16 PM
  #54  
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Time to make servo hatches. The plans call for mounting the servos in b/wn a couple ribs on hardwood rails and the push rod exits through a slot in the covering material. No call for an access panel. It would seem the servo is to be covered over completely.



I'm going to go the servo hatch access door route.



I used 3/32" light ply so it would match the cap strips. I used the same light ply b/wn the ribs to form a frame for the door to sit on.



I used some balsa strips on the ends so the covering material would have something to grab on to.



I put some triangle stock on the underside for a little added support.



I used thick CA for all the bonding for this.
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Old 04-27-2014, 05:53 PM
  #55  
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Getting the hardwood blocks glued to the servo door.



I added some gussets to give it some more strength.

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Old 05-03-2014, 06:59 PM
  #56  
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So now the problem is that there's hardly any material to attach aileron hinges to.





This is the 3/16" point hinge...too big it seems.





I'm not sure the size but the small point hinge will have to do.





I'm adding some trimmed down 1/4 x 1/2" balsa to the inside of the trailing edge. There's just not enough there for any hinge to grab onto.





Here it is installed with thick CA.




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Last edited by bicyclemonkey; 05-03-2014 at 07:02 PM.
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Old 05-03-2014, 08:26 PM
  #57  
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Preparing to mount the servos in the fuselage. The manual gave no mention of ways to mound the servos in the fuse, it just showed the recommended location of the servos. Here's what I did.


I cut a couple pieces of 3/32" ply from Hobby Lobby and used the hardwood servo rails that were supplied with the kit and stamped the location with an ink pad.



Drilled and filed the holes for the mounting rails.



Now it's time to glue to the inside of the fuse. I've been using a bottle of thick CA that I'm trying to use up before it goes dry.

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Old 05-04-2014, 09:20 AM
  #58  
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Hey Bicyclemonkey,

Was wondering which servo you show mounted? Throttle?? Love those adjustable arms, and have used them a lot - but mostly on 40 sz planes .

Do wish someone would make a good stiff metal one with mabey the bottom part being adaptable to fit many different splines.

TH has their TL150's on sale which is what I was thinking of using. Plan on running many different engines and suspect some will put plenty of stress on control surfaces.


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Old 05-10-2014, 06:43 AM
  #59  
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Originally Posted by triumphman49 View Post
Hey Bicyclemonkey,

Was wondering which servo you show mounted? Throttle?? Love those adjustable arms, and have used them a lot - but mostly on 40 sz planes .
I think that one's going to be the rudder servo. I've got a HS-625 for the elevator.

I got the holes drilled in the side of the fuse for the pushrod housings.



They will be sanded flush with the fuse so all you'll see is the 4-40 rod.



Here's a close up.



I used a 3/16" brass tube that I sharpened on the end since it cuts cleaner holes than a drill bit.

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Old 05-17-2014, 04:09 PM
  #60  
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I got the pushrod tubes supported and glued in place.



And the landing gear installed.

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Old 05-18-2014, 07:09 AM
  #61  
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Looking really good!

Nice little Volvo back there too
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Old 05-18-2014, 08:13 AM
  #62  
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Originally Posted by JRgraham View Post
Looking really good!

Nice little Volvo back there too
Thanks, and that's what my wife drives, S40 T5. I bought it new in 2006. It's the longest we've ever kept a car lol.

Getting very close to covering this baby!


Got the blocks to support the battery tray I had to make glued in place.



Battery (or fuel tank) tray from the bottom.



From the top.

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Old 06-08-2014, 06:33 AM
  #63  
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I started getting the sheeting on the bottom of the fuselage.



The view from inside.

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Old 06-08-2014, 06:36 AM
  #64  
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I finished up with the battery tray by cutting some notches and adding velcro and screwing it in place. I hardened the screw holes with thin CA.

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Old 06-21-2014, 08:28 PM
  #65  
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It took about 15 minutes to trim it with my Hobby King snap knife, then sand with three grades of sandpaper.








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Old 06-21-2014, 08:28 PM
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A couple close ups.








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Old 06-22-2014, 07:12 AM
  #67  
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Should be laying down some color in no time
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Old 06-29-2014, 11:53 AM
  #68  
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Got the holes drilled in the elevator for the point hinges.


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Old 06-29-2014, 12:50 PM
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The aileron hinge holes are drilled. Now It's time to start the covering. Unfortunately I don't have enough of any base color to complete so I ordered a boatload of covering film from both HobbyKing and HobbyPartz. Seriously, I probably won't ever run out lol.


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Old 06-29-2014, 02:38 PM
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I'm going to get the motor mounted before I glue the tail on. This way I can stand the fuse up on the end to line up the motor.


There was no thrust angle built into the firewall on this kit and the instructions make no mention of any thrust angles. I may mount the motor just slightly to the left so if I need to add some right thrust, the motor won't look crooked.








I just noticed that on my kit build Four Star 120, the engine is square on the end of the fuse and it flies perfect.


https://www.youtube.com/watch?v=dlX9DUxUJyY
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Old 07-06-2014, 07:40 PM
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I'm going to need a longer screw so I can get the motor spaced out far enough. But it looks pretty good!








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Old 07-06-2014, 07:46 PM
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Actually, I was able to add another small spacer and the screw was long enough, there'll be enough prop clearance cause there'll be a spinner back plate behind the prop.














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Old 08-21-2014, 08:07 AM
  #73  
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I had to pick up a deep C-clamp to squeeze in the blind nuts lol.





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Old 08-21-2014, 08:13 AM
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Covering has begun!


Right aileron done.



I attached a strip of covering on the trailing edge so I could go ahead and glue the hinges on.



Here's the point hinge glued into the aileron.



All glued in with Titebond II

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Old 08-22-2014, 09:34 AM
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