Elder 40 Scratch build

[GuyOReilly]

Back into building the Elder 40.
I needed to confirm the right thrust angle.
There was an 1/8 inch gap from vertical at a distance at 3.5 inches.

Given a=.125 and b=3.5,
c = 3.50223
∠α = 2.045° = 2°2'43" = 0.035699 rad
∠β = 87.955° = 87°57'17" = 1.5351 rad

Long calculation:
c =   √a2 + b2
=   √.1252 + 3.52
=   √12.265625
=   3.50223
∠α =   arcsin(a)
c= arcsin(   .125   )
3.5022314315305
= arcsin(0.035691530512412)
= 0.035699 rad = 2.045° = 2°2'43"

So who said they were never going to use trigonometry?
Yes, I have time on my hand now...

[Frank v B]

Guy,

Why all the math?
If you put in "just enough" right trust you will be fine. 
Also "some" is better than "none".

Frank  (who else?)

[GuyOReilly]

Back from the Christmas and New Year's parties, now time to build.
Two identical (almost) fuselage sides, next add the cross members.
Trial fitting landing gear block attachment and battery compartment floor.
Need to source 4 regular size servos; mini servos would probably not be strong enough.
The rudder will be pull-pull, all the cables and clevises were purchased during my Montreal trip at https://amr-rc.com/

[Frank v B]

Guy,

Will dig up 4 servos for you.
Happy retirement. 

Frank

Update: found them.

[GuyOReilly]

One coat of walnut stain.
Not as pretty as Mark's Minuette, but it will do.
The tape was to prevent staining the area where the stab will be glued.  The stain seeped under...
There is no varnish yet, maybe in a couple of days.
The receiver, servos and ESC/motor tested, all working well.   
Now moving onto the wings.
Guy

[Michael]

Looks great!

[msatin]

Looking fantastic Guy!

[Frank v B]

re:staining: getting the right colour

When repairing a scratched wood floor we use the stain in the varnish product.  The reason: you can darken the wood with each successive coat until you are happy.
If you use stain only, you cannot darken it once you put on the first coat of varnish. 
The trick is to always approach it from the light side and darken it until it matches or you achieve the colour you like.  Once it is too dark you cannot lighten the colour.  Point of no return.

Before and after photos of a wood floor repair.  Dipped a folded paper towel into the stain/varnish product and wiped it once.  Colour too light.  The second wipe was the final product  Total repair time- 5 minutes.


F.

[GuyOReilly]

Wing starting to take shape.
First step, clean the bench.   
Second arrange the parts and try to figure out where they belong using the plan as a guide. 
I determined that the ribs should be evenly spaced at 3 inches with half-ribs in between.
Third, disregard the plan.   
Mark the spar for ribs and half-ribs locations.
Next gluing and keep everything as square as possible while drying. 

[GuyOReilly]

Wings assembled and joined epoxy drying.
I decided against capstrips.
The trailing edge will be feathered into the ribs; just a bit more sanding.
I am quite pleased with the addition of the 1/2 ribs (similar to what Micheal did on his Elder).
Next, ailerons and servo set-up and a million other things.

[GuyOReilly]

I just could not resist assembling it.
The cowling is from Eric Adam's Estate.  see: https://temac.ca/smf/index.php?topic=8888.0
This is not as per the plans, but then again...
The project is 1/2 way there, with 3/4 of the work remaining. 
It will be ready for a Maiden Flight in the spring.

[octagon]

Looks fantastic Guy. Good work. Love the cowl

[GuyOReilly]

Rudder control will be pull/pull.
I understand that the control horns should be the same length to help ensure adequate geometry and functioning.
Any advice on how to rectify the variance would be appreciated.
The standard Futaba servo output arm is shown and the rudder horns are temporarily installed.

[GuyOReilly]

Decals ordered on January 10, 2024 arrived yesterday.
They look fantastic and are quite reasonably priced, see https://www.ebay.ca/itm/265067576215
Next more building.
Guy

[electroflyer]

  Beautiful work Guy!

  Hope you are going to join Rob, Michael, Dave, Simon and myself for our "Elder" flights when we take over the sky with.....Elders!

   Glenn