TiredIronGRB's 2285mm OV-10 Bronco Build

[mr.frankenjet]

beautiful nice work, yet cruel and unusual punishment to some ;)

[Ole-Timer]

The OV-10’s wing is square not swept, so MAC is the same over the entire span. Where your finger is in the picture equates to 40% of MAC. That is indeed an aft cg that will most likely result in a crash. The cord of your wing appears to be around 14 inches so
14 x 20% = 2.8 inches ...... 14 x 25% = 3.5 inches ....... 14 x 30% = 4.2 inches .....
I’d get the cg forward to around 3.5 inches aft of the leading edge provided your cord is 14 inches. You can do an exact measurement of your cord and fine tune that.

[TiredIronGRB]

The OV-10’s wing is square not swept, so MAC is the same over the entire span. Where your finger is in the picture equates to 40% of MAC. That is indeed an aft cg that will most likely result in a crash. The cord of your wing appears to be around 14 inches so
14 x 20% = 2.8 inches ...... 14 x 25% = 3.5 inches ....... 14 x 30% = 4.2 inches .....
I’d get the cg forward to around 3.5 inches aft of the leading edge provided your cord is 14 inches. You can do an exact measurement of your cord and fine tune that.

Yes, 15" so at 25% it's 3.75" which looks about right to me for it to be just a tad nose heavy.

[TiredIronGRB]

I could add a pilot to add some nose weight, what scale would you guys say...1/6?

[fhhuber]

I could add a pilot to add some nose weight, what scale would you guys say...1/6?

Full scale 58 ft wingspan.
What wingspan for the model?
Appx 90 inches...

That's 1/7.73 so I'd look at 1/8 scale pilot figures

[Twowingtj]

Wouldn't it be nose heavy if I cg to the rear of where my finger is?

If you have to move your finger back to get it to balance level, there's too much weight aft of where the cg is supposed to be.

[TiredIronGRB]

Full scale 58 ft wingspan.
What wingspan for the model?
Appx 90 inches...

That's 1/7.73 so I'd look at 1/8 scale pilot figures

Yes, 90" windspan.

[OV10]

Full scale was 40 ft span
1/5.3 scale @ 90 inches ;)

[fhhuber]

oops... looked up the wrong plane :p....

[pullupnow]

Mine from back in the day.. I still have it.. built it from the Uravitch plans in 2001. Converted to electric last winter. I wouldn't worry a lot about the cg, anywhere near the spar will work. Super predictable flyer. If you take off without flaps you will need a bit more up elevator input to get it to rotate, due to the trailing link/ aft main wheel location. Mine weighed 17.5 lbs and flew pretty well on O.S 46's. I haven't flown it since converting to electric. You will love it.

[pullupnow]

Rich's email... He designed it. aeroscale@aol.com

[TiredIronGRB]

Mine from back in the day.. I still have it.. built it from the Uravitch plans in 2001. Converted to electric last winter. I wouldn't worry a lot about the cg, anywhere near the spar will work. Super predictable flyer. If you take off without flaps you will need a bit more up elevator input to get it to rotate, due to the trailing link/ aft main wheel location. Mine weighed 17.5 lbs and flew pretty well on O.S 46's. I haven't flown it since converting to electric. You will love it.

Thanks for the info!

[AirHead]

There were a lot of rough years in it, be careful what you wish for;)

Ah; I see. My apology. I should have pointed to your "Model Aviation life". I'm hoping that at least that has not had so many rough years....Trial and error maybe, but fun at least.....

[TiredIronGRB]

Ah; I see. My apology. I should have pointed to your "Model Aviation life". I'm hoping that at least that has not had so many rough years....Trial and error maybe, but fun at least.....

The RC years are great:)

[pullupnow]

80 inch plans with CG notated and the RCU thread

https://www.rcgroups.com/forums/showthread.php?1978006-Rich-Uravitch-81-Bronco-plan

[borntoolate]

George, I am anxiously awaiting your taxi tests and maiden!!!

Bob

[TiredIronGRB]

80 inch plans with CG notated and the RCU thread
https://www.rcgroups.com/forums/show...81-Bronco-plan

Thank you!

[TiredIronGRB]

I got the other pilot in so I think I'm good on balance.

[pullupnow]

I got the other pilot in so I think I'm good on balance.

Looks Perfect! Sweet flyer! You'll love it!

[OV10]

STILL WAITING for the maiden Bro ;) Don't make me have to come down there and do it for ya :PLOL