I keep forgetting to take copious amounts of pictures. Sorry. I have mounted the starboard junker flap and it looks good, if a bit far from the trailing edge. I will take plenty of photos of the Port side tonight. Here is a small Video of the wingtip drag flap action:
Thank you so much for the article Hai-Lee. The tip flex like a normal offset-remote push only servo arm. But the Exterior wingtip returns via tension rod. the rod flexes during deflection, and when pressure is removed, it returns the winglet to nuetral position. Nice!
@ DamoRC - A bit more complex than I was originally prepared for. But it has been a fun journey of learning both about Tailless Russian experimental craft and model building using common materials and basic method to create complex mechanisms that work.
I think i have my plan now. For the servo wiring, rod layout and bomb doors. I'll sketch that out and post it in a few.
Below, find detailed photos from how I attached the second half of my reflex wing.
First lets cover what we're aiming for here.
Here's the plan design(again):
Understanding the goal here, let's go through how I line up and connect this wing-edge long flap mechanism:
Start by placing the 3rd standoff in, at the bend in the wing -where the pen is pointing. Closeup below
Remember this section is the elevator flap.
Line the piece up and 50% score on each side of the standoff and remove the foam
Glue the first segment on.
Before the glue cools, level out the flap to be parallel with the wing underside.
Now move on to the outer wing flaps (ailerons). line up the leading edge of the flap with the trailing edge of the wing and make your cuts.
Now glue. add enough so it remains soft while you push the standoff in and adjust
once all the standoffs are in, adjust so the top of the flap and bottom of the wing are parallel
look down the flap/wing to check the alignment before the glue cools.
Here it is installed. Note that every other vertical link to the flap goes through for the servo linkage.
Here's a picture of the mini-flap reflex mechanism. This is very precise and uses small forces, and may be suitable for smaller finer wire.
I hope this helps anyone interested on how to install the Junker flaps in, and get ready to link to the servos.
Thank you for the diagram Hai-Lee. Do you professionally diagram textbooks? you should.
As discussed as part of my other FTFC'18 build project the SAM-7 Sigma, Have been trying to find a good springy passive return mechanism on the wingtip drag flaps. and had a Eureka moment described there. Short of it is to use Gift card plastic strips for springs.
I shall be returning to this project from the distraction of the FTFC'18 build project SAM-7 Sigma.
I made significant progress on the wing controls this weekend. The wingtip rudders are working great.
So great I glued on the outer spars and put in the dihedral.
(Ugh, I misspelled HEAR as here at the end of last post. )
I'm really happy how it looks.
I thought I might set it up as a elevon and give it a hop test. So I tested my other motors and one twitched. It wasn't doing that on a previous test. Hmm. I can move over the other one I used on the SAM-7, but I didn't want to. stinker. then I tested the control surface movements and realized, the port aileron servo is loose/never glued down?
I took it as a sign that it wasn't meant to happen this past weekend. Tonight some plane surgery, and patching - wall-board style. I would like to try a down the street hop test with this model. in a couple days, however it may have to wait given the storm heading up the East Coast.