RE: OV-10 Bronco 81
 

My last Bronco arf had the same OS 91's as well never had a engine fail but I did have glow igniters on it. I lost it while inverted I had no response at all the throttle went wide open and went straight into the ground total loss. I trashed everything except the retracts mains they where spared.

RE: OV-10 Bronco 81
 

gg

RE: OV-10 Bronco 81
 

Hi all,I just finished my Bronco.It has OS 75ax power,Sierra retracts,Dynamic Balsa cockpit w/2 12" pilots[only had to add 4 oz of nose weight] Can't wait till spring to fly.

RE: OV-10 Bronco 81
 

62dave37

What was your total weight? I was thinking of going with a cockpit kit but didn't know how much weight that would add. You know you got to post some pic's of your new bronco!:D

RE: OV-10 Bronco 81
 

I made a decision to start my Bronco Arf build but first I'm going to do something Different. I spent a few hours last night trying to take out the wrinkles in the covering This didn't work out so well. It seems like the glue is no longer holding I could pull off the covering with little to no force at all, I also found a few cuts as well. So I'm going to strip the the bronco and re-cover it with a Military Green scheme. See pic below. I will post my build of this arf lets see if we could keep this thread alive for 10 years! 8 Days to go and this thread will be 8 Years old! Last week I sent a PM to Rich Uravitch aka aeroscale letting him know how old this thread will be. He sent me a reply last night. Below was his reply

"Thank you very much. I really hadn't realized that the thread had been alive that long! I'm glad R/Cers are enjoying it. Just finished a second 109" version and I think I'll stop the scaling up process there. Should probably start looking for a surplus 1:1 version next!
Again, thanks!
Rich"

RE: OV-10 Bronco 81
 

I have to agree with Mike setting up all dirted up with full flaps and gear coming in steep with an assault approach to a round out flair just over the fence setting it down on the mains like a butterfly with sore feet ... PRICELESS

RE: OV-10 Bronco 81
 

Update on my Bronco arf build I'm about halfway threw stripping the covering off. I would post some pic's but I left my camera at work. But I'll post some pic's later. Anyway as I'm stripping the Bronco I'm thinking what power plants I'm I going to use. Glow is out so it is up to gas or electric. I was talking with a friend and he has 2 zenoah 20cc engines he would sell to me cheap but I think the 20's are a little too big. But I told him I'll pick them up and see if they would fit and we will go from there. As for electric I have seen many if Rich Uravitch's post and video of his electric Bronco I've always wanted to try a bigger electric plane. I've got a little more money this week do to selling a kit so this money will pay for my engines or motors will see.

RE: OV-10 Bronco 81
 

BadLemon,My Bronco is just under 23lbs.It was going to need 2+ lbs to balance.The cockpit was just under 2 lbs.

RE: OV-10 Bronco 81
 

No pics yet. As soon as we can get outside. lol

RE: OV-10 Bronco 81
 

Here's the new "monster". Twin 50cc RCDF, 48 lbs. Flies like all it's predecessors but better!
AEROSCALE

RE: OV-10 Bronco 81
 

Very NICE! :D Rich!


I want to order a set of plans and parts from you do you have an idea on the release date yet? Truly awesome! I want one!:)
Have you maiden your new Bronco yet?

RE: OV-10 Bronco 81
 

Here is 4 USMC scheme's I'm considering to recover my ARF kit.

RE: OV-10 Bronco 81
 

Hi Gaines

I'm concidering using the RCGF 15cc gas engines and would like your input on them. I do have 2 = Zenoah 20i's I got from a friend but I think they are to big for the AFR Bronco frame. Also are the 3-blades props used in flight?

Thanks

Doug

RE: OV-10 Bronco 81
 

Doug,

The CD I sent with the parts has a large number of photos of my walkaround of the only privately owned Bronco in the US taken during BroncoFest V near Fort Worth, TX. It is the third photo in this set. It will probably be the one you pick. More detail than you will ever need.

Gaines

RE: OV-10 Bronco 81
 

Doug,

The RCGF 15cc engines are enough power for my 24 pound Bronco but just barely. I painted my Bronco so if you Monokote the stripped ARF you should be able to get it in at about 21-22 pounds with the engines. Another alternate for the RCGF 15s is the JBA 15. It has front mounted carb and beam mounts. All of the reports that I have seen says that it is bit more powerful than the RCGF. I think the G-20IE's will be too much engine for this model.

Here is the link for the JBA engine on RCU. http://www.rcuniverse.com/forum/m_9609247/tm.htm

The Master Airscrew 3 blades are used in flight. A Xoar or Bambula 2 blade would provide more thrust but then it wouldn't look as cool:).

RE: OV-10 Bronco 81
 

Gaines

Thanks for the info I'll check out the CD you sent me I should have the package today or tomorrow the latest I'll let you know when I receive it. Your right on the zenoah 20's they are just a little too big for a 81" Bronco. Thanks!

Doug

RE: OV-10 Bronco 81
 

Hey everybody

Today is the official 8Th. Birthday of this thread! I had to post something today, I wanted to put up some pictures of my build but I'm just to sick to do much today. I caught the FLU from my daughter! I would have to say I have never officially had the Flu until now! I thought I was going to die, but I think I would have to get better first to die! I got tired of just laying around so I thought I would get on the internet to pass some time then remembered today was the 18TH. Everybody have a great weekend I'm going to lay back down I'm getting dizzy[:@] !

RE: OV-10 Bronco 81
 

Just a small update and pic's, I finally beat the Flu I don't ever want to catch that again so next year I'm going to get a Flu-shot. Last night I finished stripping the Bronco. All of the covering pulled off by hand no heat needed. I hated to do it but I seriously think I would of had the covering coming off in flight![X(] Just 3 areas on the the wing and left vertical stab I had to use heat to remove the covering. I did find a couple of wing ribs that had cracks in them and 2 pieces of sheeting was lifting up off the rib. I also had a some damaged sheeting on the horizontal stab. All areas where easily repaired But know I want to fill sand sand some dents and joints. I would like to start covering the Bronco but I have to place an order for it the LHS only stocks the covering that is relatively used. I think I'm going to work on mounting the retracts as well.

I was wondering if anybody out there modified the wing so it could be broken down in two pieces? I have a couple of ideas 1: to add 3 hard points and bolt the 2 wings together. 2: Cut the outer wing half at the outer nacelle add 2 hard points and a wing tube I would also have a add another servo to operate the outer flap this would bring the flap servo count to 4. Does anybody have any other ideas?

Lastly The Bronco pic below is the scheme I'm going with. To me the wing looks like it is entirely painted white? Does anybody know for sure?

RE: OV-10 Bronco 81
 

-I made a 3 piece wing from modified plans. I added 2 more servos for the outboard flaps, it's just a matter of connecting the ailerons and outboard flaps, sliding the panels together and fastening them. I figured the fewer things I have to assemble at the field, the better.
-I tried to copy the '68 VMO2 squadron in Vietnam, but the picture wasn't clear enough to tell if the bottom of the wing was white or gray, so I just made it white.

RE: OV-10 Bronco 81
 

Badlemon,

I have a picture of an all white wing. It is not the same squadron, but basic aircraft colors are generally not left up to the squadron. I think you can use an alll white wing with confidence if you can't find proof.

RE: OV-10 Bronco 81
 

I did mine the same as CanDo

RE: OV-10 Bronco 81
 

I did mine in this sceme

RE: OV-10 Bronco 81
 

CanDo

You said you did a 3 piece from modified plans, did you make the mods your self or did you get the plan mod from some body? The wing is already built because it is an ARF "I'm sure you know that" I want to make the 3 piece wing like you did even Gaine Smith's Bronco has a 3 piece wing it would be nice to only plug in the wing panels and not have to asemble the hole frame. I had another Bronco ARF with the one piece wing and it we a bit of a pain at assemble at the field. I'm just a little scared I don't what to cut the wing to find out I have to pull off the sheeting as well and then there goes the ball game.[:@] I guess this is what make the hobby so much fun!:D Thanks for any help you could give me.

RE: OV-10 Bronco 81
 

To be honest, after inspecting the ARF's wing, I decided to start over. I started with the Uravitch plans, but instead of making a one piece wing, I made the main center panel and two outer panels. The panels are joined with 3/4" aluminum tubing and sleeves from TNT. You will also need some smaller tubing at the trailing edge to prevent the wing panels from rotating. If you check out some of the bigger aerobatic planes, you will see a similar set up to install the wing panels. When I finished, the 3 piece wing was stronger and slightly lighter than the ARF's one piece wing! I also saved ~2oz in the tail by replacing the horizontal stabilizer; the wood they used to frame up the stab was very heavy. For some reason, the distance between the nacelles was different on the ARF, so replacing the stab solved that problem as well. Note, every Bronco seems to come out tail heavy, more weight aft of the CG means more nose weight later on.

RE: OV-10 Bronco 81
 

Here are some photos and a drawing of the fill and cap ribs I used to make the three piece wing. A TNT tube and sleeve assembly is used for the joint. Works great; make the cuts carefully and you won't have to strip the wing covering at all.
AEROSCALE

RE: OV-10 Bronco 81
 

All we need now is for someone toi offer those parts as a lasercut option!

:)

Bill S.

RE: OV-10 Bronco 81
 

Hmmm, maybe the next OV-10 will have a 3 piece wing?!! Double check your dimensions to make sure your plane will fit in your vehicle, I had to separate the wing panels at the nacelles to make mine fit in my car. Because I also wanted to make some changes, I decided to start over.

RE: OV-10 Bronco 81
 

CanDo makes a good point. Measure your vehicle before deciding where to cut your Bronco wing. When cut at the point shown (outoard flap/aileron juction [color line also]), the center panel spans 52". The same technique would apply if you decide to make the cut just outboard of the nacelle, but you will need to make minor modifications to interconnect the inboard and outboard flap panels.

AEROSCALE

RE: OV-10 Bronco 81
 

I agree Form what I measured if I cut the wing panels like you did the main wing panel will be 52" with the plug in panels removed. This is what I need for sure and will fit in my truck for sure. Thanks aeroscale for the wing modification and pic's this will help a lot.:D

Lastly any update on the 109" Bronco plans???;)

RE: OV-10 Bronco 81
 

What size wing tube did you use 3/4" or 7/8"? I can't print out the diagram my printer stopped working.

RE: OV-10 Bronco 81
 

I received the engines I'm going to use, They are the JBA 15cc gas engine. I purchase them from Valley View RC www.valleyviewrc.com
They where suggested by Gaines and he gave me a thread here on RCU that talked very highly about them.

RE: OV-10 Bronco 81
 

The tubes themselves are .88, the phenolic sleeves are .94.

RE: OV-10 Bronco 81
 

Just a quick update I was traveling all week for my employer just got back last night. I received the wing tubes from TNT that Rich suggested for the wing modification. I also received the new mono-coat as well. I have been having trouble mounting the Sierra nose gear because it retracts forward as the scale unit does. I found out that Sierra has a sport and scale kit for the uravitch bronco and the scale nose gear unit is for the KMP 96" Bronco so it is a little bigger and would not fit the pre-installed retract rails. I had to remove them and 2 bulk head formers and come up with a new retract mount. I started to make a new mount with plywood I have the pieces cut I just have to glue them into the fuselage. If everthing goes well today I should have the retracts mounted and the wing tubes installed. Well see.

RE: OV-10 Bronco 81
 

Badlemon,Be sure to mount the nose gear at a 15 degree angle so the front wheel will be completly up in the nose.

RE: OV-10 Bronco 81
 

Hi 62dave37

Thanks for the tip and Yes you are right but I had to go a little more angle to 18 degrees to get the wheel all the way in. The strut will have a slight forward rake but that shouldn't be a problem.

RE: OV-10 Bronco 81
 

Does anyone know where the plastic parts can be found for the 81 inch OV 10 Bronco. Rich Uravich has stopped taking orders for these parts and I am in need of them. Any help would be appreciated.

RE: OV-10 Bronco 81
 

I have only stopped taking orders for plastic parts for my designs to avoid disappointment to those who order. My supplier is no longer making them for me and I am seeking a new supplier for the parts. It is, hopefully, a temporary situation for which I am actively seeking a solution.

Rich

RE: OV-10 Bronco 81
 

Well it's been awhile since I have looked at this thread do to too much traveling for the company I work for. Well traveling has slowed down some but I won't get the 80" Bronco finish this year so I will finish it over the the fastly approaching Winter. I did build a another Bronco this year I found a 52" arf Bronco and installed a pair of hacker motors. I just maiden it 2 Sundays ago and know have 11 flights on it. It flys just like it's big brother, at first I was a little worried about taking it off from grass but it is no problem so I would like to put some retracts in it over the winter. The Bronco flys great with the electric motors and now has me fired up to complete the 80" Bronco and it has got me to rethink my choice of using gas engine and going with electric motors. I've never had great luck with fuel engines and with today's electric motors it just makes sense to me. I also found out that Gaines Smith "gsmiths6879" lost his 4Th Bronco a short time ago do to both engines failing at once. I felt sorry for him he put a lot of custom mods into it to make it more to scale. To me it is the best looking Uravitch 80" Bronco to date. Look back a few pages to see some pic's he posted of his custom build and mods. I hope it to restart the 80" build soon but here is a video of the 11 flight of my 52" Bronco.

http://www.youtube.com/watch?v=R71ePn5wxxg

RE: OV-10 Bronco 81
 

Don't have anything lined up for a Winter build and was thinking about one of these kits. Are the plastic parts available now or is this kit basically dead?

RE: OV-10 Bronco 81
 

Kits are still listed at www.hobbyhangar.com