Hello. I am building a hanger 9 showtime 4d and my CG is approx. 1 inch too far to the rear. As per the instruction manual. Is this close enough or should I add lead weight to the front? I would like to keep it as light as posible. Moving my battery pack is not an option as they have a recess for it already. Any advice on CG would [8D]be greatly appreciated. Thank you in advance for the help.

G'day Mate,
1" is a long way out, 1/4" changes can be detected when flying, make sure you are on the recomended CG point or even a tad forward, fly it & then adjust as required.

Add the weight!!!

Nose heavy planes may fly poorly. Tail heavy planes may fly ONCE!

Dr.1

I don't care if there's a gold placard showing where the battery goes, move it forward. Strap it to the side of the Engine Box and drill a hole through the firewall for the wire if you need to.

Then, if it still needs it, add lead.

As was said before, you can get away with being a little nose-heavy, but you do NOT want to fly a plane that is Tail-Heavy.

A very nose heavy plane flies poorly..... A very tail heavy plane flies only once!!

Ken

Minn beat me to it... Find a place to move that battery pack forward. Make a spot for it if you can. Usually a couple of small holes drilled to accept zip ties will work very well.

Then add weight if that does not work.. I would not add weight unless you have no other choice as the plane will not fly as well with added weight.

However, in case you havent already heard it before Nose heavy planes fly like crap, tail heavy planes only fly once.

If you do have to add weight, consider a heavy prop hub that fits under the spinner. The farther forward you add weight, the less you have to add. And since nobody has mentioned it a nose heavy plane flys poorly, but a tail heavy plane flys once.

Awesome advice gentlemen, thank you. Looks like I'm drilling some holes to move the battery pack...

And since nobody has mentioned it a nose heavy plane flys poorly, but a tail heavy plane flys once.

Mike East
RCKen
Dr1Driver

Perhaps you missed their posts?

However, it DOES bear repeating.

Dr.1

Using a flat pack we were able to position the batteries under the fuel tank and added a small piece of balsa to keep them from sliding aft (just in case).

We ended up having the cg 1/8" toward the tail.

I had a nose heavy airplane once, it really flew poorly. I moved the CG aft so it was tail heavy and it only flew once.
regards,
doubledee