This is my second US 40....the wing flew off the first one. [X(]
I have a K&B .61 on a fibre mount, as close to the firewall as possible.
The K&B is light, and makes great power. The complete radio system
is mounted as conventional....1100 ma batt....balance is perfect, no
weight needed.

The rear wing hold down is beefed with a big hardwood block, and 3
1/2-20 nylon bolts....the wood is tapped.

The tail feathers are braced, because the stab glues on to the fuse
without a slot to fit into....very weak design.

The wing saddle is doubled up, and wing saddle tape is used. The wing
has to be tight, and not allowed to vibrate, or it will burn the front dowels
off....literally. Look closely at the front dowel holes....there is a doubler of
ply in behind the stock plate....with metal washers glued on as well

Dave.