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DAVE ANDERSON'S BENCH MOD "Park Scale" Herr Models Piper Cherokee Page 3
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In this picture you can see how the new aileron butts up against the new spar I installed.  Notice that I used triangle stock to beef up the rib joints.  The dowels seem to be a good idea at this point, because they naturally created a rotating edge the aileron needs as it moves up and down on the hinge.  Perfect!  But not quite - I later found I needed more of a gap in the hinge area, but all it took to fix that was a little more sanding on the new spar.  You can also see the doublers on the inside of the outer spars - works well too!
Having finished up the new spar for the hinge, it was time to get the aileron servos installed.  I'm using the E-Flight EFLRS75 servos I had on hand.  They're super light and are more than big enough to handle this small load. As you can see, I simply mounted a balsa plate with a couple of stock pieces and glued it all in using CA.  It's hard to see here, but the servo is correctly installed, screwed into mounting posts on the plate.  The plate had to be low enough to hide everything inside the profile of the wing, but that proved to be no problem!
In this closer view, you can see the mounting for the servos, the triangle stock for the ribs against the new spar, and also - an additional spar parallel to the ribs. In the picture, you can see I've hollowed out the new spar to accomodate the movement of the servo arm.  It will serve as a place to attach the wing covering to, helping to keep things looking sharp!  Of course, I also had to route to servo wires back to the fuselage, but it turned out to be a very simple procedure.
Once the servos were ready, it was time to cover the wing again!  Thanks again to Dave Agar's suggestion to use Ultracote - that stuff is nice!  As you can see - the new covering turned out great! Covering the wing was very simple.  Even Carter could do it.
I simply LOVE the clean design I've got with the control arm projecting from the bottom of the wing!  To replace the servo, of course, would mean cutting into the wing, but I don't plan to have to do that too often.  And hey, now I know how to do it!
Covering the wing was easy, but not without issues!  The wing tip is canted from the top of the wing to the underside, but I had a trick in mind.  I covered the wing right up the to edges.
Then, I sanded away the overleaf off the wing tip.  This allowed a nice clean surface to which I applied the red accent covering.  Maybe you senior guys already know about this trick, but I was raised in the "School of Hard Knocks" and common sense prevailed here!
So with the wings done, it was time to concentrate on the new power system.  I have elected to use a system compatible with the systems I have in my other birds - like the Supercub, the ME 109 and the Cap 232.  I had tried a new motor in the Supercub: .10 made by SuperTigre!  The motor is super-light with 1250Kv - more than enough revs!  I'll be able to use the same ESC and batteries as I do with my other planes.  Here you see the original motor mount, with the Wasp removed.  Once I started looking at it, I discovered this was going to be more than easy!
You can see the SuperTigre is can-shaped.  I was worried that it would fit under the cowling without further mods, and it does!  Sweet! I did note that the electric's mount had four prongs - they would be a problem, so I found it easy enough to cut off the two not needed.
On any project, it's nice to have friends, however, and that's where Luis came to the rescue!  A couple of beers and friendly conversation to help, we trimmed off the mount's projecting shelf to the length the new motor would need, electric mount and all!  In filing off the old mount, we made sure the angles were in place to give the new mount some good down thrust and right thrust!  Adding the thrust offset is invaluable when beefing up a power system like this.  I slotted the mounting holes for the mount to get some vertical adjustment. ( Incidentally, the beers didn't help us get this done too quick!  But some good eyeballin' fixed it up right! )
After the mounting for the new SuperTigre was completed, I found the old cowling fit right over everything just as I'd hoped!  You can see the picture on the Home Page of this project.  With the purchase of the new motor and the Ultracoat, it cost me out-of-pocket about $40.00.    Not bad!  The old cowling is still cut for the old Wasp engine - a new one's on order now.  With the 7x5 prop, I'm pulling over 100 watts!
Here's a view of the left side - all finished up with aileron attached and the red trim to set it all off!  Nice!
So that's it!  Not a true scale conversion, but it flies so scale-like, it almost gives me chills!  Good thing I had the down-thrust on the motor setup too, because the thing will scoot like a bat out of h. . .  !!!  Every flight is much more stable and it is a real dream to pilot.  I'm still playing with expo on the transmitter, but it's coming in very nice.  Now one one of my favorite birds to fly of late, I'm very happy with the outcome!
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