Gents,

Normally I use some flights to find out the weight to mount in a wing tip to balance the plane in longitudinal direction.
In the past I did have to adjust weight in the left wing to counterweight the muffler, now the airspeed transmitter in the left side wing does generate more imbalance than the muffler so I have to mount the weight in the right wing.
Still I have to do adjustments, other engine (OS Max , MVVS) or different electronics or pitot tube.

Normally I mount a number of bolts (picture 1) in the wing and after the trim flights are done I replace the bolts by a piece of lead glued in the wingtip.
After that re-paint the tip, see the picture 2. It is no point, I have to do that nearly once a year because the tips often are touching the ground. Covering material silk and dope

Sometimes I wonder how people do this when flying an ARF and do not paint the wing,

So how to balance the muffler system in an ARF pattern plane?
Does someone use an adjustable system to switch over from pipe to muffler?

Cees