It was given to me.
Its a balsa constructed 4Ch. trainer looking plane with a 57.5 wing (not flat bottom) a 46 Royal engine (never run) looks to be 20+ years old. ROYAL-AIR 40S (or 405?) Is printed on the wing.

Can anyone give information like - C.G. location ?
Engine run in prop size?
How old it is ?

You're giving us very little to go on. Pictures would help immensely. Back in the day, kits did not come with engines. You bought your .46 Royal engine and put it on any built kit that you felt it would handle properly. Having a .46 Royal on it tells us only that the builder bought a pretty nice engine to put on whatever kit he built.

<a href="file:///C:/Users/stacy/Pictures/2010-03-14/230.JPG">file:///C:/Users/stacy/Pictures/2010-03-14/230.JPG

<a href="file:///C:/Users/stacy/Pictures/2010-03-14/231.JPG">file:///C:/Users/stacy/Pictures/2010-03-14/231.JPG

<br type="_moz" /></a>file:///C:/Users/stacy/Pictures/2010-03-14/232.JPG<br type="_moz" /></a>

cant get them to open- sorry

That sounds like the Wright flyer from Hobby People and Hobbico had a similar plane. I have the Wright flyer hanging in the garage right now. It has a 100 years of abuse on it. I have the Wright Flyer 40S. They had the Wright flyer 40H and the 40L H= High wing, S = shoulder wing, L = low wing. It is sort of an ugly stik type of plane.

Well the Royal .46 was a copy of an O.S. .46, a Magnum .46 of the same time was also a clone. Start 10X6 for break in. C of G should be on the main spar. About 1/3 from the leading edge will get you in the ball park. I would suggest you take the engine and clean it up inside and out before trying to start it. You could just get a gallon of denatured alcohol and put it in a coffee can over night. Oil it up and then start it.

It does fly reasonably slow, has a nice gentle stall. Good all around plane. Does nice rolls, loops, and inverted flight.


Dru.

I also could not get the links to work, but it sounds like a royal 40s or shoulder wing. Royals attempt at an intermediate trainer. A good safe balance point is the main spar or about 25-30% back from the leading edge. A 10x6 or 11x5 will work for flight, for break-in I would use the 10x6. I don't think they have made those aircraft since the mid to late 90's. I have the trainer version and other than a slow roll rate it is a good flying and well built trainer, I am just finishing a total refurb. due to hanger rash. On a side note most were covered in a non iron on covering(much like a sticker, you will notice the design has plastic tips to avoid compound curves.) so repair can be difficult. This is all assuming it was made around the early 90's. It should be white with red and blue trim and black plastic tips on the wing, horizontals, and vertical tail.