RE: First time scratch build-- Uravitch 81" OV-10 Bronco  
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All Forums >> RC Airplanes >> Twin & Multi Engine RC Aircraft >> RE: First time scratch build-- Uravitch 81" OV-10 Bronco
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RE: First time scratch build-- Uravitch 81" OV-10 ... - 3/27/2008 4:00:28 PM   
CanDo


 

Posts: 78
Joined: 2/23/2006
From: Ventura, CA, USA
Status: offline 		Nice work! I don't know what glue you use for skins, but I've had good luck with "Titebond II". For those who don't already know, the aliphatic glues are strong and easier to sand smooth (and light!). I used masking tape to pull the pieces together, then I put some weight on them to keep them flat while drying. Works great!

(in reply to cmoore806)
       Post #: 26

RE: First time scratch build-- Uravitch 81" OV-10 ... - 3/27/2008 4:03:50 PM   
cmoore806


 

Posts: 164
Joined: 8/1/2002
From: Bay Village, OH, USA
Status: offline 		I also use titebond, but not titebond II. I dont have anything against other titebond glues its just that this is what I have in the shop =) I used thin ZAP CA on the cap strips since it is easier to do that than it would be to use titebond and masking tape.




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Chris Moore
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       Post #: 27

RE: First time scratch build-- Uravitch 81" OV-10 ... - 3/29/2008 3:39:33 AM   
cmoore806


 

Posts: 164
Joined: 8/1/2002
From: Bay Village, OH, USA
Status: offline 		What kind of engine mounts do you guys like to use in twins? Through reading I have learned that soft mounts arent a good idea. I would love to get the OS aluminum mounts but at $31 each it would be a little expensive for the engine mounts. Any recommendations?

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Chris Moore
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       Post #: 28

RE: First time scratch build-- Uravitch 81" OV-10 ... - 3/29/2008 5:11:10 AM   
rrudytoo



Posts: 644
Joined: 12/23/2002
From: Simpsonville, SC, USA
Status: offline 		cmoore806,

I've used the Great Planes adjustable glass-filled mounts for years without a problem. They're relatively cheap and adaptable for most any application. I mount them solidly to the firewall with no anti-vibration considerations at all.

Al

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(in reply to cmoore806)
       Post #: 29

RE: First time scratch build-- Uravitch 81" OV-10 ... - 3/29/2008 1:04:49 PM   
cmoore806


 

Posts: 164
Joined: 8/1/2002
From: Bay Village, OH, USA
Status: offline 		Thanks Al,

I was looking at either that one or a Hayes (similar enough). At $5 each it is easier to stomach! Anyways. Here are a couple more pictures of progress. I cut the scarf joints and they are ready for gluing. As soon as the bottom wing skin halves joined together dries I will have some bench space to make the basswood spars.

I dont know how I made scarf joints in the old days without a bandsaw and a disc sander!



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Chris Moore
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       Post #: 30

RE: First time scratch build-- Uravitch 81" OV-10 ... - 3/30/2008 4:12:02 AM   
cmoore806


 

Posts: 164
Joined: 8/1/2002
From: Bay Village, OH, USA
Status: offline 		Here is my progress so far. I am slowly working my way down the wing and aligning everything perfectly before I weight it in place and glue the joints. I spent a good amount of time making light plywood 'frames' for the locations where there will be openings in the balsa wing skin (servo hatches, openings in the nacelle and fuselage areas), This should give the area plenty of strength with little increase in weight. I will keep plugging along!

It is nice to just stand back and admire the wing---all that wood is actually starting to look like an airplane!






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Chris Moore
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       Post #: 31

RE: First time scratch build-- Uravitch 81" OV-10 ... - 4/4/2008 2:54:14 AM   
cmoore806


 

Posts: 164
Joined: 8/1/2002
From: Bay Village, OH, USA
Status: offline 		How do you guys get nice 90-degree bends in torque rods and still get the thing in the wing? I can get one bend in one end using a vice but cant get a good bend on the other end once it is put through the nacelle wing ribs.



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Chris Moore
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       Post #: 32

RE: First time scratch build-- Uravitch 81" OV-10 ... - 4/4/2008 3:52:25 PM   
CanDo


 

Posts: 78
Joined: 2/23/2006
From: Ventura, CA, USA
Status: offline 		Chris, nice work on your wing, it's a shame you have to cover it all up! Sorry I don't have an answer for your torque rod "challenge", I put a servo on each control surface (that's why I have 14 servos!).
-Les-

(in reply to cmoore806)
       Post #: 33

RE: First time scratch build-- Uravitch 81" OV-10 ... - 4/4/2008 4:49:13 PM   
cmoore806


 

Posts: 164
Joined: 8/1/2002
From: Bay Village, OH, USA
Status: offline 		Les,

I know what you mean. I am a JR man myself so I am very happy that JR has their Sport line of inexpensive servos! With ten servos it is the extensions that would be expensive. All I have to do is order 25 feet of wire and solder connectors for a week of evenings and I will be set with the wiring!

Chris

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       Post #: 34

RE: First time scratch build-- Uravitch 81" OV-10 ... - 4/4/2008 5:29:14 PM   
FallDownGoBoom



Posts: 170
Joined: 10/12/2003
From: Colbert, WA, USA
Status: offline 		Chris:

Great build so far. Your work is admirable.

I built one of the little Bronco's a couple of years ago and put quad flaps on it. Rather than using torque rods, I combined the way the Top Flight Bonanza and Wing B-25 approach their flaps. I ran 4 flex cables through the ribs, one for each flap, with a 90* bend so that the cables come out perpendicular to the flap leading edge (that's from the Wing, you can see the rudiments if you go to Artazlin.com and look at his B-25 builds). Fabricated a control horn out of 1/16 ply and build it into the leading edge of each flap (you can look at the Bonanza construction manual online for details.) Soldered a clevis to the end of each cable, then connected that to the control horn. That way the flap controls are invisible when the flaps are up.

At the other end of the four cables, a JR 537 was buried in the shear web in the center of the wing. I put easy connectors on each side of the servo control horn, and then connected two cables from each side onto the control horn. That way the flaps get "pushed" down and pulled up. On the little Bronco one 537 was sufficient... I'd probably do two servo's on your big one, one for each side.

Just an idea.

Fred

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       Post #: 35

RE: First time scratch build-- Uravitch 81" OV-10 ... - 4/6/2008 2:44:42 PM   
cmoore806


 

Posts: 164
Joined: 8/1/2002
From: Bay Village, OH, USA
Status: offline 		After a dry run to make sure everything fits right and will set into place under weight I layed out a thin layer of polyurethane glue on the wing and wet the wing skin slightly to help the glue cure. Things are looking pretty good so far and the glue should set up nicely. After te bottom of the wing is sheeted I will build the top wing skin, sheet the top of the wing, separate the ailerons and flaps, cap them off, and hinge them.

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       Post #: 36

RE: First time scratch build Uravitch 81" OV-10 Br... - 4/16/2008 2:46:22 AM   
cmoore806


 

Posts: 164
Joined: 8/1/2002
From: Bay Village, OH, USA
Status: offline 		Guys,

I have a NIB .91 Surpass II with a pump and am considering buying a second and putting them on the bronco. Do you think that .91 four strokes would be too much engine? I figure it would cost the same for me to buy one more .91 four stroke OS engine as it would for me to buy two two-stroke engines....if not cheaper.




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RE: First time scratch build Uravitch 81" OV-10 Br... - 4/16/2008 3:57:40 PM   
CanDo


 

Posts: 78
Joined: 2/23/2006
From: Ventura, CA, USA
Status: offline 		It''s your call. I put 2 OS .91 Surpasses (non-pump) on mine. I know from past experience that it''s not difficult to get at least 8lb of static thrust from each motor. With a 18lb plane, you''re talking about nearly 1:1 thrust to weight for your Bronco. I only have a little experience with a .65 Saito engine, but it has been very reliable for me.

(in reply to cmoore806)
       Post #: 38

RE: First time scratch build Uravitch 81" OV-10 Br... - 4/16/2008 6:02:52 PM   
cmoore806


 

Posts: 164
Joined: 8/1/2002
From: Bay Village, OH, USA
Status: offline 		Les,

Did you have to move the firewalls back to accommodate for the longer engines? Did it interfere with the leading edge of the wing where the dowel connects to the nacelle? I will probably go for the .91 surpasses (can swing a larger, more scale 3-blade prop) if the length isn't an issue as much as I think it may be. I am still working on the wing and will finish it completely before I move to the nacelles/fuselage/tails...I have only looked at plans and set the engine on the side view so I am hoping you can lend some first hand experience.


Chris




< Message edited by cmoore806 -- 4/16/2008 6:03:32 PM >

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Chris Moore
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(in reply to CanDo)