I bought a 300 ES which has a fairly heavy moter on it along with a reduntant battery system. Long story short Im putting a lightweight engine different batterys etc an took about a 1.5 lb of weight out of the nose doing so.

Im sure this has been hashed over many times but about where does my cg need to be to achieve a fairly neutral balance upright an inverted?

About 3.5 inches back from the wing tip LE.

TF

I have the ES 300 as my first large gas plane. Would you start with the CG that far back?

The manual says 2 1/2" to 3" back of the LE at the wing tip. I'd say 3" will be good for you.

3 1/2" is more for 3d.

TF

The 3-1/2" CG is rock stable as long as the control deflections are maintained within reasonable limits. That same CG permits slower an softer landings, along with a somewhat less violent snap when one is performed. I found that most planes require a higher approach speed and are "snappier" at more forward CG's than one that is at the aft side of the normal range. The Edges and Extras both fall into that catagory, with a Giles benefitting greatly by moving the CG slightly aft. That pretty much applies to just about anybodys product.

Both the 28% Extra and Edge are excellent "first time gasser" and "first giant" scale planes for just about everybody. They are exceptionally easy and very satisfying to fly.

Thanks guys, it should fly this week.

I could have figured out the wing cord but it was easier to ask someone that flys them.

Thanks again guys it must have been way nose heavy before as its only around 3 inches with the lighter engine an no spinner.

I worked late tonight but let a cpl of friends take it up an just got the call that it flew well etc etc!!!! Said it did one of the most beautiful flat spins he had ever saw. Probably move the battery packs out of the nose an back the fuse a little as he indicated it was a touch nose heavy for the way we like them set up.

Going to see if I can slide out of work early tomorrow an get some stick time in.


Ill have to get some pics up of the engine, cool looking 45ccer that seems to have a lot of promise.