I just bought a 60 size Goodrich Extra 300s airplane. Can anyone give me the specs on CG and throws? The wingspan is 66 3/4". Thanks

G'day Mate,
What brand?

Thanks for your interest.

I'm afraid I don't know who manufactured it. I looked all over the internet and couldn't find the model exactly like mine. I will post a picture of it on the internet. I purchased it at an auction and now have it ready to fly.

For the CG, measure the wing and plug the numbers into any of the CG calculators out there. You want 25%-33% of the average chord. That means you have to take in to account the wing sweep and taper, but it's not hard to figure out.

For control surface movements, you should be able to find online instructions for simular sized models. Just check to see that the control surfaces look pretty close in size. Then knock a little off and give it a go.

Of course, it also depends on your flying ability. I personally can handle some awfully squirly planes, so I usually eyeball control throws anyway. Put in some expo just in case as well, it will help if you over-do the throws a bit.

I'll bet it's this one:



[link=http://www.nitroplanes.com/ex306054niga.html]Link[/link]

I have one of these, so I'll check the manuals and post the info later tonight.

Thanks, that's the one. How do you like how it flies? I have only flown advanced trainers so far. I have some friends at the field that fly Caps and larger Extras to help me learn how to fly it.

Ok...

C.G. 110mm from the LE of the wing CENTERLINE ( not measured at the fuse, rather at the wing center ).

Throws

Aileron 10mm
Elevator 12mm
Rudder 15mm

IMHO these are too conservative.

I maxed out my high rates and then set my low rates to give me the above.

That way I could start out with the recommended throws and quickly switch up or down to check the higher rates and find what I was most comfortable with... it snaps easily on high rates so be careful not to overdo it... however the wing loading is low..

I used a low rate Expo of 30% for ailerons and elevator and 15% for rudder.
I used a high rate Expo of 50% for ailerons and elevator and 25% for rudder.

It flies fine, but I have not had a chance to fully wring it out as I'm still breaking in the engine.

The wings are large enough that tip stalling is not as big an issue.

Thanks. I look forward to getting it in the air.