I've just finished putting together a Hanger 9 Alpha 60 trainer, and the CG is off by about .75 inches (nose heavy).

Using coins on the tail I can easily move the CG to the proper spot, but it's taking a bit over 4 oz. to do so and have the plane perfectly level. Since it's such a simple aircraft the only internal option I have is to shift the battery towards the tail, but without cutting the covering I'm not going to be able to move it very far, and it's fairly light anyway.

Is this an excessive amount of weight to bring it into balance?

The engine location is spot on with respect to the firewall and thrust washer, and in any event there is virtually no room to move it back slightly anyway. With a simple aircraft like this I figured that the CG would be almost correct right out of the box, so I'm a bit surprised. This is my first plane, though, so I don't really know if this is typical or not.

Thanks,
Bob