Finally the building season is here! Taking a break sometimes gives me a new perspective on the project and I see mistakes I’ve made and dead ends I’m headed for.
But first, I installed the flap servos which originally I was going to place back against the center longerons with a pushrod going rearward to a bellcrank pivot on the longeron. A fresh look caused me to place the servos in a more service friendly spot reachable thru the battery compartment. A carbon fiber tube will run back to the bellcrank then down to the flaps.
The nacelles are now held to the fuselage by two 6-32 screws placed inside the battery compartment to blind nuts in each nacelle.
One problem I caused for myself was placing the motor mount holes too far apart, the only solution I could figure out was to glue a new mount ring on the back side of the firewall with the proper spaced mounting holes. Somewhat easier said than done, using my Dremel tool with a carbide bit I ground thru the firewall to make room for the motor mount then used the original blind nuts to screw the ring to firewall while the glue cured. Probably I’ll have to use some small standoffs to place the motor in the proper position for the props and spinners.
All of the perimeter banding is now secured to the fuselage and nacelles, I’ve started cutting in spruce stringers to reinforce and spread the loads from the nose wheel to the fuselage. Once the top is planked more will be placed on the bottom before it’s planked too.
I thought I’d give you a quick look at how I roughed out my stabilizers. The left photo is the location the spars/shear webs and the horizontal stab mounting box. I went thru several designs before settling on this one. The main issue was to design the vertical stabilizer to be strong enough hold the mount for horizontal stabs. There are 4 spruce spars that are placed vertically from both sides of the keel longeron up thru the center of 3 ribs. The stab mounting box will be placed between the second and third ribs locked in by the spruce spars. All the wing spars and the box mounting spars will be shear webs so I think it will be strong enough.
The right drawing is the same except cleaned up with a vertical rib sample. This drawing is for Jim to use as he puts the ribs into cad to be cut. For those wondering the airfoil for the stabs is a NACA 0012. The control surfaces will be fabric covered just as in the original.