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-   -   OV-10 Bronco 81" (http://www.rcuniverse.com/forum/twin-multi-engine-rc-aircraft-192/566432-ov-10-bronco-81-a.html)

halflight 02-18-2003 04:03 AM

OV-10 Bronco 81"
Anyone build Uravitch's 81" Bronco? Nearly completed and it's coming in about 12 lbs. or so. What engines are you using?

nemesis4u 02-18-2003 04:59 AM

Hi, I am about to start on mine....I measured the plans and I believe .91 OS FX's will fit if you don't use the wooden block offset on the firewall...THey may protrude out of the top though...just a little....Mr lumpkin aka TWIN MAN says to go large like a .61 and up if you fly off grass besides you can throttle back...I am still debating myself...

nemesis4u 02-18-2003 05:20 AM

color schemes
By the way what color scheme are you going with??? Any mods to the plans??? I heard you are probably gonna come out tailheavy.....move that battery to the nose....

nemesis4u 02-18-2003 05:22 AM

ACHTUNG!!! Caution!!!! I remembered that you'd better reinforce the horizontal stab/elevator mounts as 3 seperate people had elevators fly off in flight.... Just a warning..

Wayne22 02-18-2003 06:28 AM

OV-10 Bronco 81"
There is a post nearby that I started several months ago about my Dad's OV-10.

12 lbs is really light. Ours is closer to 20 (for a number of reasons - including a pound of ballast in the nose ) and 2 saito 91's provide plenty of power.

It is a sweet flyer!

twinman 02-23-2003 01:45 AM

My ears are burning. Yes, if the plane is over twelve pounds and you fly off of grass, I would suggest at least 90's.
Mine at rcwarbirds.com is a little heavier and I wanted scale three blade props, so it has a "Little" larger engines.
Good Luck,

Steven Sloan 03-01-2003 12:50 AM

OV-10 Bronco 81"
I scratch built a 70 inch version. Mine is about 13lbs I'm not sure always been to scareed to weigh it!! I first flew it off of grass with a pair of MDS.40's It was scarey a little low on power no room for mistakes. I went to a pair of Thunder Tiger .61's and made a fun airplane to fly. I mistake I made was not putting flaps on it, landing speeds are very high. We have about 900 foot of very nice grass runway and it takes most of it to land! Live and learn high wing loaded airplanes need flaps!

Fili 03-11-2003 03:47 AM

OV-10 Bronco 81"
I have both nacelles framed up and the fuse framed on mine. I wasnt going to put flaps on, but now I think I will. Still havent chose what retract to use. I've been shopping, found some scale looking retracts, but $$$. But I like em!.....Don't tell anyone, but I ran nyrod thru the fins for the elevators..... Then I read to beef up the stab area...... so I chose to drill a few holes and glue 1/8 inch dowels thru the stab and plywood nacelle sides......Yup you guessed it. Shhhhhh.... I drilled right through the nyrod caseing on both sides. Put a dowel right through em' both...duh
Actually, my repair job made things a little smoother, and I believe stronger.
This is a cool looking plane, I can't wait for the first high speed low pass........

Steven Sloan 03-13-2003 01:33 AM

OV-10 Bronco 81"
I will not tell you know sometimes things just happen! I have alway felt it usaully was for the better. I think you will like having flaps. I took off work Friday it going to be nice here and hope to get a few more flights on the OV-10. I will try to get a picture to post.

rhakkenberg 03-14-2003 09:18 PM

OV-10 Bronco 81"
PICTURES PLEASE!!!!!!!!!!!!!!!!!!!!!!!

pa_28r_200 03-14-2003 10:05 PM

OV-10 Bronco 81"
I've got the smaller version with 2 OS 28's, and I'm contemplating building the larger one...anybody know who's making glass cowls for it ??? What retracts are you guys using ??

Steven Sloan 03-16-2003 02:04 AM

OV-10 Bronco 81"
I build mine the cheap way, we fly off a grass field I did fixed gear. I also do not have cowling on this one. I had a small one with MDS .28s on it and the overheated with the cowls. The way the fire wall is on the OV-10 you need to duct the hot air out some way, mine did not have enough exit area. I fixed it the easy way on the bigger one I left the cowls off. Yea I know it does not look right but it sure is fun to fly!!!

Wayne22 03-16-2003 07:01 AM

OV-10 Bronco 81"

PICTURES PLEASE!!!!!!!!!!!!!!!!!!!!!!!
here is a couple....


Wayne22 03-16-2003 07:03 AM

OV-10 Bronco 81"
It is modeled after one NASA still uses for atmospheric research.


Steven Sloan 03-16-2003 03:30 PM

OV-10 Bronco 81"
Nony, What kind of engines did you use? Do you have trouble keeping them cool?

Fili 03-16-2003 05:43 PM

OV-10 Bronco 81"
Thank you so much for the photos, I read the review in the latest issue of MAN, I'm thinking about going with the Thunder Tiger GP61s.I also like the Precision retracts, They offer both fun scale and scale. Check them out at http://sierraprecision.com/prod16.html
Century Jet air had a set for the Bronco as well. I emailed Robart but they havent gotten back to me yet. (It's been two weeks)
These are,I Think, what I'm going to use in mine, I still have to build the wing, So I have time to research and ask around.
Oh Yeah, How did you fasten the stabilizer to the finns? I'm looking for a quick,strong way without having to rebuild (too much) what I already have built.

Wayne22 03-16-2003 06:47 PM

OV-10 Bronco 81"
It is powered by 2 Saito 91's. The engines were moved 2" forward for clearance and it helps with the cg. They run perfectly - no problems at all with cooling.

I will have to get back to you on the stab mounts. It is my Dad's plane, and I will check with him. I know they are strongly reinforced over what the plans recommend.

drifter 03-17-2003 09:36 PM

fiberglass parts
1 Attachment(s)
They are available but I don't know from whom. I bought these from someone here on RCU. The balsa parts are from the Uravitch plan. The glass parts are less boxy and just look better. Going to use two St 90's. It will have 14 servos and two flight packs (one in each boom.) Elevator servos are mounted in the fins. too much binding and slop using bell cranks. Spring Air retracts.

Sarah 03-17-2003 10:05 PM

OV-10 Bronco 81"
Hi Drifter,

I would be grateful if you could put a picture of the retracts on this topic as I am thinking of getting the Spring Air units for my Bronco.

Many thanks,


drifter 03-17-2003 10:43 PM

1 Attachment(s)
The retracts are heavy duty with a firewall mount nosegear. Simple wire struts. The nose gear strut from Springair was unusable because the coil struck the gear frame preventing complete retraction. I had to bend my own. The scale gear from Sierra looks good but is way out of my price range for a sport plane.

Russ Verbael 03-18-2003 02:30 AM

I was an OV-10 Driver......
1 Attachment(s)
I loved flying the OV-10...did a tour in Vietnam as a Forward Air Controller.

Anyway, you guys are doing a great job with your Broncos.

Here is a pic of a full size OV that is at Davis-Monthan AFB in Tucson.

fw190d9 03-18-2003 04:05 AM

Russ, What squadron did you fly with? Im asking because my father was FAC in 68-69. His call sign was Covey 220, Based at DaNang.
Evan Quiros
Looks like Im gonna have to add a bronco to my warbird collection. Drifter, Id like to know who makes those fiberglass parts.

drifter 03-18-2003 06:07 PM

I purchased them here from this ad:

Sarah 03-18-2003 07:22 PM

OV-10 Bronco 81"
I am about to make a new building board to build a number of models on. Could someone please let me know what size of board will be required to build the Bronco on, as I am waiting for the plans to arrive.

Many thanks,


halflight 03-19-2003 01:08 AM

building board
Sarah, I built one (the 81") on a 24"x48" board.
Lots of luck.

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