150% Scale Old Speedster

This was the second plane that I built.   My first was an Axon from experimental airlines.  You can see how that ended up after I learned to fly...  (it was still flying fine after that photo was taken)

So with my second plane I wanted something a bit simpler.  I wanted to try 3 channel plane, and I wanted it to fly slower.  The FT Old Speedster seemed to fit the bill perfectly, so I scaled it up to fit my motor. 

  

It's not perfectly scaled, I didn't actually measure anything other then the length and wingspan..  But for eyeballing most of the dimensions I think it turned out pretty close.

For a while everything was single sheet exactly like the Old Speedster plans, but eventually one of the wings folded in half.  Maybe single sheet wasn't a good idea for the wings..  I added a second sheet on the bottom of the wings spanning all the way from edge to edge, which helped make the joint where the dihedral is much stronger. 

I also scaled the offset in the wing proportionally (the one that makes the left wing longer to compensate for left turn tendency).  The plane still experienced some left turn, and the trim is such that the rudder isn't straight.  So- if you scale this up, don't expect the extra length needed in the left wing to scale perfectly. 
 

Now, because I knew I was going to crash it, The wing is actually rubber banded on.  Because the wing is mounted mid-body, the body under the wing is attached to the wing and also held on with rubber bands.  This setup worked well, and the wings survived many crashes.  

I also wanted a more durable type of motor mount.  I ended up screwing the motor to a PVC plate, which was then rubber banded in place.  When I crashed, the rubber bands would pop off, and the motor and prop would be saved.