First time scratch build-- Uravitch 81" OV-10 Bronco  
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All Forums >> RC Airplanes >> Twin & Multi Engine RC Aircraft >> First time scratch build-- Uravitch 81" OV-10 Bronco
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First time scratch build-- Uravitch 81" OV-10 Bronco - 3/20/2008 5:01:32 PM   
cmoore806


 

Posts: 164
Joined: 8/1/2002
From: Bay Village, OH, USA
Status: offline 		Hey everyone. SO I bought all kinds of fancy tools in preparation for this moment. I spent most of my modelling time building planes on a building board on the dining room table. After moving to a home of my own a year and a half ago I put in a workshop in the basement. So I have a band saw, a scroll saw, a belt/disc sander, a spindle sander, and plenty of bench space. I also had picked out a couple of plans for planes and am saving them to build later. I put in my order at Balsa USA for the wood I need to build the Uravitch Giant Bronco and the order came to me in three days! What a great surprise. Anyways, I always read about how to transfer plans to wood and how to select the right wood, etc. Now I finally had a chance to build a kit from plans!

Here are some pictures of the ribs I cut out so far. Wish me luck!



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_____________________________

Chris Moore
AMA 497715
       Post #: 1

RE: First time scratch build-- Uravitch 81" OV-10... - 3/20/2008 6:49:02 PM   
cobi.p


 

Posts: 31
Joined: 1/10/2008
From: rosh ha-ain, ISRAEL
Status: offline 		hello to you
let me be the first one to congratulat you with the best of luck and a happy build

you have choose your self a very good and well fly plane for your first progect and from a very excellent designer .

i will watch your post very close because i want to build this one too .

let's see your progress come ........

cheers - cobi

_____________________________

i believe in " KISS " - ( Keep It Simple Stupid )
building the don smith B-24 J 1/9 scale

(in reply to cmoore806)
       Post #: 2

RE: First time scratch build-- Uravitch 81" OV-10 ... - 3/20/2008 8:57:41 PM   
CanDo


 

Posts: 78
Joined: 2/23/2006
From: Ventura, CA, USA
Status: offline 		-Hi, I built my smaller Uravitch Bronco from plans, and the wing and horizontal stabilizer on my 80" OV-10. I also bought the 80" ARF (for the nacelles and fuse) and removed the covering to change its colors. This gave me a chance to see how it was built. The short story is build it light, especially any part of the plane that is aft of the CG (like the nacelles, vertical stabs, horizontal stab, etc. Some things you should decide early on is: one piece wing or 3 piece wing?; which gear to use? (fixed , retracts); which motors to use? (2 stroke, 4 stroke, electric); etc. These decisions will determine the details of your design. Note, as far as I know every 80" Bronco built (including ARFs) was tail heavy, some more so than others.
-If you go to " CanDo " at:
http://www.rcuniverse.com/community/profile.cfm?section=profile&forum=1&memid=237938
you can see what the Bronco ARF looks like without the covering. Notice that the ARF substituted balsa for lite ply in the fuselage and nacelles, and it is a one piece wing.

(in reply to cmoore806)
       Post #: 3

RE: First time scratch build-- Uravitch 81" OV-10 ... - 3/22/2008 11:16:43 AM   
fancman


 

Posts: 1121
Joined: 11/21/2002
From: N. Charleston, SC, USA
Status: offline
quote:

ORIGINAL: CanDo

-Hi, I built my smaller Uravitch Bronco from plans, and the wing and horizontal stabilizer on my 80" OV-10. I also bought the 80" ARF (for the nacelles and fuse) and removed the covering to change its colors. This gave me a chance to see how it was built. The short story is build it light, especially any part of the plane that is aft of the CG (like the nacelles, vertical stabs, horizontal stab, etc. Some things you should decide early on is: one piece wing or 3 piece wing?; which gear to use? (fixed , retracts); which motors to use? (2 stroke, 4 stroke, electric); etc. These decisions will determine the details of your design. Note, as far as I know every 80" Bronco built (including ARFs) was tail heavy, some more so than others.
-If you go to " CanDo " at:
http://www.rcuniverse.com/community/profile.cfm?section=profile&forum=1&memid=237938
you can see what the Bronco ARF looks like without the covering. Notice that the ARF substituted balsa for lite ply in the fuselage and nacelles, and it is a one piece wing.

Exactly right. Ditch the ply sides for balsa as they did for the ARF. My kit built Bronco was much heavier than the ARF because the ARF doesn't use ply sides or the thick bass wood formers in the fuselage. Build the nacelles as light as possible and you will still need about a pound of weight in the nose to balance.

(in reply to CanDo)
       Post #: 4

RE: First time scratch build-- Uravitch 81" OV-10 ... - 3/22/2008 7:07:44 PM   
CanDo


 

Posts: 78
Joined: 2/23/2006
From: Ventura, CA, USA
Status: offline
Cmoore806, you picked a good project to work on. Rich put a lot of effort in this design to make it enjoyable to build. To be honest, I enjoy building as much as I enjoy flying his planes! When you bring it out for the maiden flight you will have a plane to be proud of, plus you will have a plane that makes you look good when you fly it. Don't tell any anyone, but as long as you tune the motors carefully (happy motors = happy owners!), check the CG, etc, this plane is not difficult to fly. It's not a trainer, although it was my twin trainer, but it is a smooth and predictable plane, especially for landings. If you scan through some of the other OV-10 threads, you will learn a few more helpful hints from guys like Fancman. These guys have "been there, done that" and they know what they are talking about. Good luck...have fun!

(in reply to fancman)
       Post #: 5

RE: First time scratch build-- Uravitch 81" OV-10 ... - 3/23/2008 12:08:54 AM   
cmoore806


 

Posts: 164
Joined: 8/1/2002
From: Bay Village, OH, USA
Status: offline 		I wont be switching the ply with balsa as recommended for two reasons, one, I cut out the ply already and two, it just wouldnt make me comfortable. The ply cant hurt and the lite ply is, well, not that heavy. I will save weight elsewhere: two stroke engines instead of four, spring-air retracts not scale struts, one piece wing instead of three piece....Cutting is going well now...I took a little break to build an edge-truing fixture! Thanks for the words of support and advice!

_____________________________

Chris Moore
AMA 497715

(in reply to CanDo)
       Post #: 6

RE: First time scratch build-- Uravitch 81" OV-10 ... - 3/23/2008 3:25:00 AM   
cmoore806


 

Posts: 164
Joined: 8/1/2002
From: Bay Village, OH, USA
Status: offline 		Does anyone have experience with Spring-Air retracts? I ordered the mains and nose gear but need to pick out an air valve, tank, and fittings. I plan to use a robart air valve for the three way gear. What did you use?

Here is a picture of the edge truing fixture I built today. I cant use it yet since the polyurethane is still drying.

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Chris Moore
AMA 497715

(in reply to cmoore806)
       Post #: 7

RE: First time scratch build-- Uravitch 81" OV-10 ... - 3/23/2008 3:26:05 AM   
cmoore806


 

Posts: 164
Joined: 8/1/2002
From: Bay Village, OH, USA
Status: offline 		And here are some misc. parts I cut out yesterday.

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Chris Moore
AMA 497715

(in reply to cmoore806)
       Post #: 8

RE: First time scratch build-- Uravitch 81" OV-10 ... - 3/23/2008 3:38:06 AM   
fancman


 

Posts: 1121
Joined: 11/21/2002
From: N. Charleston, SC, USA
Status: offline
quote:

ORIGINAL: cmoore806

Does anyone have experience with Spring-Air retracts? I ordered the mains and nose gear but need to pick out an air valve, tank, and fittings. I plan to use a robart air valve for the three way gear. What did you use?

Here is a picture of the edge truing fixture I built today. I cant use it yet since the polyurethane is still drying.

I have a set of Spring Air Retracts that I used in my kit built Bronco. With the weight of the Bronco in the kit built form you're probably going to be at about 20 lbs and if you're flying off grass you're going to find the spring air retracts and the music wire gear lacking. I've been there and done that. Gear had to be straightened after every flight. I'd be more than willing to sell them to you for a good price if you would like.
The Spring Air Retracts are very easy. all you need is the fill and retract valve and a very small air tank.

< Message edited by fancman -- 3/23/2008 3:39:54 AM >

(in reply to cmoore806)
       Post #: 9

RE: First time scratch build-- Uravitch 81" OV-10 ... - 3/23/2008 1:50:58 PM   
cmoore806


 

Posts: 164
Joined: 8/1/2002
From: Bay Village, OH, USA
Status: offline 		Is there anything I can do to the 3/16" struts to help them not bend?



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Chris Moore
AMA 497715

(in reply to fancman)
       Post #: 10

RE: First time scratch build-- Uravitch 81" OV-10 ... - 3/23/2008 2:54:00 PM   
fancman


 

Posts: 1121
Joined: 11/21/2002
From: N. Charleston, SC, USA
Status: offline 		I couldn't figure out anything to do to stop the bending. Others have said that there was no problem with bending if the model is kept to 17 lbs or so but I don't see how you get there with the plywood and such. The ARF is built with balsa sides and no heavy formers in the fuselage. You'll just have to see how things turn out.



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(in reply to cmoore806)
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RE: First time scratch build-- Uravitch 81" OV-10 ... - 3/23/2008 3:14:05 PM   
Fili



Posts: 345
Joined: 10/8/2002
From: Queensbury, NY, USA
Status: offline 		I also had problems with the spring air struts bending. I just ordered the scale struts from Lenny at www.shindinmachine.com/ I wasnt too worried about the bending, just wanted to make a few changes for this upcoming season.

To help with weight I drilled lightening holes in the ply fuse sides and the nacelle sides all the way to the tail. She still came in at 19#

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Phil
CORSAIR Brotherhood #20

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       Post #: 12

RE: First time scratch build-- Uravitch 81" OV-10 ... - 3/23/2008 4:09:43 PM   
CanDo