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Apr 30, 2020, 04:14 PM
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Flying Fortress.'s Avatar
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Build Log

Ov-10 Bronco foamie


I finally finished figuring out what I want to build with foamboard... I'm going with one of North American's most beautiful and unique designs; the Ov-10a Bronco. I'm making my Ov-10 have a 3ft (36in) wingspan powered by 2x 2200kv brushless motors on 40a ESCs, spinning 5x4 four bladed propellers running off a 3s 11.1v 2200mah 40c LiPo battery. I'm planning on making it 6ch with flaps and possibly retracts depending on real estate in the nascelles/booms. I'm using Dollar Tree Adam's Readi-board, balsa, hot glue and plywood as the materials.

I am currently working on the wing and after that I will be moving on to the nascelles/booms, after I finish gluing it all together. Hopefully it turns out good, either way I will love it with pride even if it turns out ugly.

I would appreciate any suggestions, comments, history, or ideas for my build. Here are pics of the wing so far;

See page 3 for maiden flight video!
Last edited by Flying Fortress.; Sep 13, 2020 at 04:44 PM. Reason: Progress made
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Apr 30, 2020, 04:23 PM
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Flying Fortress.'s Avatar
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I have completed the wing after days and days of designing along with marking cuts and grooves. I am now currently working on the nascelles/booms.
Last edited by Flying Fortress.; Aug 17, 2020 at 03:22 PM.
May 22, 2020, 01:51 PM
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Cobra1365's Avatar
Update?
May 23, 2020, 02:46 PM
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Sorry to all of you watching this build log, I've been busy with work during this covid-19 stuff and I've had a lot of extra work hours. I've started the nascelles/booms but clearly not a lot of it. I've mostly been figuring out design and scale of each part.
Last edited by Flying Fortress.; Sep 13, 2020 at 04:46 PM.
May 23, 2020, 09:08 PM
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Today I finished the booms for the Bronco, and after dry fitting them to the wing, I can already see an Ov-10 in the parts and pieces of foamboard. I'm next installing the rudder servos and servo extensions, after figuring out where exactly I'm putting them. -Note that I'm building with no plans or instructions, complete scratch build.
Last edited by Flying Fortress.; Aug 17, 2020 at 03:22 PM.
May 25, 2020, 07:16 PM
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rajazo's Avatar

Ov-10 Bronco foamie


Hi FF, your bronco goes great, congrats!
Iím a fan of the Bronco, itís beautiful and a great flyer, and I made one (5 or 6 to be more precise) some years ago that can help you to get done ideas or detect problems.

https://www.rcgroups.com/forums/show...ronco-EB/page7

It was a long way from a simple profile pusher to a twin engine version (post #100)

I hope I can rebuilt my own design soon, now helped with some 3d pieces to more easy and scaled details


Good look on your project!!
May 26, 2020, 11:55 AM
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Flying Fortress.'s Avatar
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Thanks rajazo, I too am a huge Bronco fan. My build is going good except I made a mistake and attached the booms to the fuse before I added a 1in spacer, -oops. I'm going to have to cut and redo it, oh well. I admire your build, is that foamboard you used? Or actually depron it appears. Looks great!

Thanks.
Last edited by Flying Fortress.; Aug 09, 2020 at 12:56 PM.
May 26, 2020, 11:10 PM
Foam is where the heart is
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Hi, I scratch built a little 1meter Bronco many years ago and it is still one of my favourite planes to fly.
It literally flew straight from my hand with no trim or adjustments needed and stayed that way until I recently crashed it. Now repaired and flying as good as ever.

I have some concern with the size of your ailerons as they seem a little on the small side to me. Mine will roll extremely well on full rates so they could be reduced, but not by much. Also, flaps are not really needed as this plane it is pretty draggy, and with windmilling props she slows down enough for a very gentle landing.
I ditched the rudders after a while because they were not all that useful and the complicated linking mech was a bit of an eyesore. I use differential throttle instead.

Anyway, great choice for a build and hope all goes well.
May 27, 2020, 11:04 AM
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Flying Fortress.'s Avatar
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brett.c, your Ov-10 looks great! And yes, I too thought about the ailerons after I put the wing together. I have a problem of trying to make everything to scale, so I made the ailerons and flaps to scale to the real Ov-10 blueprint I used. Might be a mistake in my part, but time will tell. The dual rudders might help a little and make up for my small ailerons, or at least I am hoping it will. If it has a problem with too small of ailerons I will link the flap segments with the ailerons.

Thanks.
Jun 06, 2020, 11:57 AM
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I finished installing the servos and attached the booms to the fuse. I'm hoping to finish this build by the end of this month, since now I have some extra free time.
Jun 07, 2020, 05:13 PM
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I built the vertical stabilizers and hot glued them to the plane, I made them out of balsa because it is the one point of the plane that will have all the stress of elevator input and I had no carbon fiber rods because of covid. I next cut out and installed the rudders which I used packaging tape to hinge. I am now currently working on the horizontal stabilizer/elevator.
Jun 08, 2020, 12:51 PM
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I finished building the horizontal stabilizer/elevator, and after installing a metal geared servo for the elevator, I glued it to the tails.
Jun 11, 2020, 07:28 PM
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I cut out the fire walls out of 1/4in plywood before I burned holes for the wires and screwed on the motors, I gave the motors a little downward angle of attack to keep the plane from climbing to much. I then opened up the bottom of the wing because I forgot to wire everything when I put the wing together, then I wired everything, and cut out some holes for the ESCs to breath through and put the wing back together.
Last edited by Flying Fortress.; Jun 11, 2020 at 07:44 PM.
Jun 11, 2020, 07:31 PM
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I cut out the walls and floor of the fuselage and glued it to the wing, I just cut it out rectangular for simplicity until I glued it on. After drying, I trimmed the walls to make way for the battery hatch/canopy.
Jun 11, 2020, 07:42 PM
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I cut out two square pieces of foam, hot glued 'em together and sanded them to shape to make the cargo door for the Bronco. After that I glued a piece of foamboard to it and added some other pieces to make it slide into the rear of the fuselage as a friction fit between it and the fuselage so it is removable. Then I sanded out the nose for the fuse in the same process before I got glued it to the front. I also tested out the motors and it produced 2lb 12oz of thrust! It's current weight is about 1lb 10oz so it has more than enough power.
Last edited by Flying Fortress.; Jun 27, 2020 at 11:35 AM.


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