Sig 4*40

Wing Area:

604 sq. in.
Wing Loading: 19.1
Motor: Hacker B50 10L Geared 6.7-1
Prop: APC-E 16x10
Cells: Thunder Power 6S3P-6000 Prolite
Amps: 50
Ready to Fly Weight: 80oz
Watts Per Pound: 200

This is the Sig 4*40 built with a B50 10L Hacker Motor geared 6.7-1, Hacker Master 30 cell 48 amp ESC, 16x10 APC-E prop, 4 Hitec HS-85BB servos, Hitec SuperSlim receiver, UBEC, and a 6S3P-6000ma ThunderPower Lithium Polymer battery. The all up weight can in at 80oz to give me 200 watts per pound.

This is all of the wood that was either replace or removed from this kit.

This is the replacement wood, a 6.9oz savings.

I pushed the elevator and rudder servos back into the tail to make room for the flight pack.

I am using Hitec HS-85BB micro servos to save weight.

The wing is a quick build with standard construction. 

The only thing I changed with the wing is to move the servos out into the 4th rib bay and open small holes for the wires to go through.

Before I glue the top turtle deck on I add a light ply rail.  The front of the battery will be secured to this rail with Velcro.

To make the battery hatch I glue the turtle deck from F1 to the firewall and from F2 back.  I then make a hatch to fill the gap. 

The fuse is only 8.3oz ready for covering with motor mount and 2 servos installed.

Everything ready for covering.
Close up shot of the motor. I am pushing my luck by using the SonicTronic motor mount but it has worked so well for me in the past an weighs next to nothing.
With a 19.1oz wing loading this plane has no bad habits and slows down nicely on landings.  1000watts is overkill for this plane but WOW what a rocket.
Click on picture to view a 12mb video of the 4*40 in flight.