I have a lazy tiger P51 that I have replaced my OS 25 with an TT Pro 46. I need to add 3.5 oz to the tail of the plane to balance out the heavier engine. I temporarily used stick-on lead strips under the horizontal stab, but would like a more permanent solution.

The fuse is fully sheeted balsa with no openings in the tail area other than where the control rods exit the plane.

What creative way would some of you experienced guys suggest I use to add 3.5 oz to the plane on a more permanent basis than the stick on weights?

The plane, by the way, flies awsome! I was reluctant to put such a large engine on this plane, but was tired of the slow response of the 25. I had an extra 46, so used it. It is my favorite plane to fly right now. (25 rubber bands on each side to hold wings :-))

Thanks!

Terry

Get some lead shot, mix it with epoxy and add it through a small hole in the tail. Just be careful that it doesn't 'set' around a pushrod!
Dennis-

I do the same thing. When you do this, it can be a bit tricky depending on how big a hole you can afford to make in the fuse. I normally push the lead shots in first, then use a 10cc syringe to inject 60-min epoxy thru the same hole. You may need to drill another vent hole for air to escape when you inject the epoxy in. I use 60-min to allow ample time for the epoxy to flow in between the lead ball spaces. Clean any excess epoxy with alcohol and re-cover with monokote.

Maybe you can find a way to move one fourth that weight from the nose further back into the plane. Maybe slide the battery pack back or move something else back like existing nose weight. Then you would not have to add anything to the tail. Even if you moved the battery back and had to replace it with half the that in noseweight you have plenty of power there to carry the extra weight.

Ditto, solder some extension wires on your battery and stick it as far back into the tail as it will go (if you're not using Nyrod type push rods, be careful that you don't interfere with them). Then, add lead/epoxy if needed.

I surface mounted the elevator and rudder servos aft. I could have painted 'em to match the covering, but you can't see 'em in the air anyway...

move things around untill its wright dont add weight as then you become under powered .

adding weight should be a last resort-move things around as much as is possible and if you really must, add weight

Weight is the enemy. Remove the battery pack, place the plane on a CG machine at it's proper balance point. Set the battery on the fuse moving it aft until the plane balances. This is where you need to build your hatch. If the plane has a solid bottom cut out a hatch slightly larger than the battery. Do some covering work. Install some hold down tabs & you're good to go.

Joe

Get a larger battery pac to make up some additional useful weight.