Building Tips and technical articles. > Building techniques
Endgame III Build
Ken Culbertson:
Test beds are meant to test. The canard has proven to be a plus but it was not made strong enough so I am going to replace it with a stiffer one with a wider range of movement so I can test it better before starting on Engame IV. I have toyed with using a CF Tube (arrow shaft in my case) as an Elevator LE with imbedded Robarts hinges. Actually made one before the fire but never quite figured how to make the horn work. Endgame has the elevator horn on top which makes the access hatch unsightly. While messing around with the Canard horn I came across a way to make it easy to adjust that would probably work on a stab. It would make the elevator ratio adjustable through a small hole in the bottom similar to the Walker flap adjustment port. The only thing I need to figure out is whether a #3 bolt is strong enough or if I need a #4.
Ken
Scientifiction .:
Hurumph .
While the shortest way between two points is a straight line ,
sometimes you take a wrong turn . or overshoot . Never Mind ,
I needed the exercise . And we know the district better .
RIGHT . The STRAIGHT THROUGH is a balls up , lad . Sorry / it needs
like these reconfigured FLAP HORNS with a Dog Leg , perhaps ? ?
wotcher gotta do is strap it on the side . Id be loath to put any oles in your main transverse load bearing member there . The Foreplane Spar .
as its a stress disruption , discontinuous continuity of deflection ( under that much load ) Like if you hit a big bump in the air while maxed out
downhill . We all know where that leads ( the tennis courts , Thats where all the racket was the other night . UNLESS its the ' dog ' ! ? next door )
RIGHT , bound X loop ea, thing / side / end - the horn will hang on well enough . You could even do a conventional slider with vertical adj. screw & side allen key
or hex head & buy a ring spanner that fits . A little one .
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What the general theory IS . ( you coud do this if THAT is a ' test ' piece ! :! Bend it over your knee or something more sophisticated . Like a fake nose ,
with the bits where they are there , and see what happens . Try it with a unmolested Std. tube - and observe its curve etc . Like throwing a 3 foot steel tube on a stilson or socket handle
to get it off . Or down FIRM .
Bend the b&# thing till it snaps . & see if it bends even & PROGRESSIVELY . which I think is what I was looking for . Should be inside its elastic limits . Even under severe overload .
Whereas a uninterupted member ( Carbon Tube to us ) perhaps is yards ahead . Perhaps not . But Id like a bit of groudwork to find out beforehand , were it mine . This we call brevity . ;D
The thing looks a bit like a air brake , if it were whacked up at 45 degrees . Which would put a bit of load on the cross shaft . Which is what all the bitching is about .
Wonder it didnt take off . Oh Dear . It did , actually . Most Unpleasant . But was catapulted rather than that thing there .
Scientifiction .:
cant picture . but
You could throw a threaded hollow bar ( thick wall tube ) with a crescent in its side - to mate the cross tube .
So you screwed that bolt up & down in that . with a locknut or two . Personally the pushrod end offends .
Me - Just a L bend in 3 M M wire , across into a small block / tube / bit ? / piece of 1/4 thick suff . Paxilon / Bakelite / tufnol . ??
Nut staked ( soldered nut / wasjher ?? woteva ) so the fitting stays as it rotates . OR , if the pushrod will throw out the side -
just undo there ( ' C ' clip - or just a vertical timber THING that stops it going sideways inward when its in . the pushrod - sideways .
When its out - wind X turns - throw in pushrod . Throw in side restraint . Wouldnt even need a locknut .
YOU apply for the Patent . Send all the proceeds to ME . ;D S?P
LIKE a 1/2 Sq pice of 1/4 nylon stuff . ( old prop hub ) drilled for vertical screw , drilled for pushrod end . Bolt screws up & down through the threaded tube strapped on the cross beam .
Threaded tube has been filed across - near to threads , Strapped and bound onto cross spar . THIS would put the Push Rod End pretty much staright over the pivot . If you want it there .Tangental .
We just realised , so the end justifies the biginning . Where was I . More Tea . Thanks .
Ken Culbertson:
--- Quote from: Scientifiction . on September 07, 2023, 05:04:49 AM --- Personally the pushrod end offends .
--- End quote ---
Searching for an old picture and I ran across this post. You will be pleased to note that this was replaced by a DuBro clevis that makes the AOA adjustable. The vertical adjustment worked great but changing the height also changed the AOA so I made it adjustable. Where it is located makes it necessary to take all the electronics and battery out and use two wrenches and a 6-pack of beer to adjust it, but the beer makes it worth it. So far it is working. Probably 200 flights on the plane by now and no slop.
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