TiredIronGRB's 2285mm OV-10 Bronco Build

[TiredIronGRB]

This is the OV-10 I got at Nall in the Fall for $100















I started out working on the landing light and gears first, after looking at a bunch of retracts on my other planes I decided on the Freewing A-10 main gear for the mains and a Freewing AT-6 main gear for the nose gear.




For the motors, mounts and props I used the FMS Pitts (5060 KV360) motor and modified mount. I'm using my spare HSD Skyraider props and FMS 1700mm P-47 hub nut (for now).





Patched the cowls (they were cut for gas engines) with styrene and epoxy, I will finish them later.

[Hemidoo]

Wow ! That's a monster project in more ways than one :-)

[OV10]

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I got 2 Franklins plus the cost of the predators and freight/handling ;)

[TiredIronGRB]

Here's the A-10 retract/strut...I powered up the motor/prop combo and it should be plenty of power. I took detailed pictures of all the decals and will get Callie to do the livery once I decide on one.

[Hemidoo]

Looks like you may need stronger springs on the landing gear to regain some ground clearance !

[TiredIronGRB]

Looks like you may need stronger springs on the landing gear to regain some ground clearance !

I've got it weighted down so that's how it should sit RTF, it's about 75% compressed but even at 100% there's plenty of prop clearance.

[RRHandy]

Stop that TI, you're making Charlie drool. LOL;)

[TiredIronGRB]

More progress, ready to balance it and do a taxi test.

[rifleman_btx]

Very nice! Making me wish i had the room for something like that. Looking forward to the flights

[TiredIronGRB]

Very nice! Making me wish i had the room for something like that. Looking forward to the flights

I hope it will get off the ground:Silly:

[rifleman_btx]

It will, ive got faith in your capabilities brother

[TiredIronGRB]

If I could get comfortable about the CG it's ready to fly.











Extra points if you can guess what I made these exhausts from...

[OV10]

Can hardly wait for that maiden. Make it happen captain..............:Cool:

CG........1/3 MAC will get you in the air without issue and go from there ;)

[Twowingtj]

If it balances where your finger is in the pic, it looks a bit tail heavy. Esp for maiden:Scared:. With a straight wing like the OV-10, I like to go with the high point of the airfoil or the main spar as a starting point when you don't have a manual for CG guidance. Hasn't failed me yet.

Also noticed that main tires look squashed a bit and the NLG strut is bottomed out. What does she weigh George?

[Ole-Timer]

I second what Tony says George. I prefer my maidens with a cg between 20 to 25% mac, then adjust as required.

As I like long flights from my birds I regularly use large mAh batteries which of course drive the weight up over what would be considered normal. A couple of my nose struts were bottoming out. The local hardware store has several types of springs in stock and I was able to find a suitable heavier replacement for the stock spring in the nose strut.

[TiredIronGRB]

If it balances where your finger is in the pic, it looks a bit tail heavy. Esp for maiden:Scared:. With a straight wing like the OV-10, I like to go with the high point of the airfoil or the main spar as a starting point when you don't have a manual for CG guidance. Hasn't failed me yet.

Also noticed that main tires look squashed a bit and the NLG strut is bottomed out. What does she weigh George?

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

The mains are about 75% compress standing that should be good. It weights 24.97lb with batteries.

[AirHead]

Man, I wish I had your life....

[TiredIronGRB]

Man, I wish I had your life....

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

[Pauly]

Center of Gravity Calculator

How to use the calculator Input your root chord Input your tip chord Input the sweep distance (see the picture below) Input the wing half span (1/2 the wingspan) Input the desired balance point percentage. (for normal planes it should be between 30-33%, flying wings will be 20-25%) This should get you in the ballpark. Other factors that will effect CG position are tail area, tail moment and airfoils. Always set your plane up a little nose heavy for first flights!!! The calculator will give you the CG at the wing root! Plus a few other numbers you might be interested in.

Simple calculator for determining The CG distance from Leading edge at the root chords when the percent MAC is known. Enter Root Chord (A): Enter Tip Chord (B): Enter Sweep Distance (S): Enter Half Span (Y): *Enter %MAC Balance Point: Sweep Distance @ MAC (C) = Mean Aerodynamic Chord (MAC) = MAC Distance from Root (d) = Balance Point @ Root Chord (CG) = *Note: A 25% of MAC is generally accepted as a good starting point for the CG of a conventional tailed aircraft. The normal range most often falls between 25-30% of MAC Use this calculator to determine percent of MAC for a given CG Enter Root Cord (A): Enter Tip Cord (B): Enter Sweep Distance (S): Enter Half Span (Y): Enter Center of Gravity (CG): Sweep Distance @ MAC (C) = Mean Aerodynamic Cord (MAC) = MAC Distance from Root (d) = % Mean Aerodynamic Cord (%MAC) = For S<>0 Forward or Rearward Swept For S=0 Straight Leading Edge C = (S(A+2B)) / (3(A+B)) C = Zero MAC = A-(AC/S)+(BC/S) MAC = A-(2(A-B)(0.5A+B) / (3(A+B))) d = YC / S d = (2Y(0.5A+B)) / (3(A+B)) For all Values of S CG = %MAC B.P.*(MAC) + C Here is something that might help you

[Pauly]

Or just go to www.coastalplanes.com and click on tools for helpful things.