I am building a LEXL and am using the spring suspension. Drilled and mounted the vertical plates onto the fuselage as per plans where the gear legs will mount. The pivot points of the gear tops are horizontal, parallel to the lower longeron.seems like your stating that correctly Now, the v strut is tipped forward 12 degrees as per plans, meaning the pivot point at the top of the spring assembly is tipped 12 degrees downward to the rearNow you have lost me, perhaps I am not understanding your terms as per part of the landing gear.. This difference in the hinge lines does not allow the gear leg to lift up.If I read your first line correctly, you said your pivot points of the gear tops are horizontal and parallel, And I would call these points "your hinge line, or center of axis line" So what are you calling the "difference" as you stated they were NOT different at the beginning. I will try and post a pic. Also you will see I’ve been using wooden dowels to get the geometry correct, glad I did. Making me crazyI tried to see the full gear A frame down to the axle, could not determine this from your photo In fact could only see what hinge point... maybe I'm missing something?
I will try and post a pic. Also you will see I’ve been using wooden dowels to get the geometry correct, glad I did. Making me crazy
After looking at my last post I realized it still might not be clear. So let me add I realize without the spring assembly nothing can move. My mocked up gear leg is not attached to the axle sleeve, so if you grab both with two hands and lift, that is when you will see them separate and travel upward in two different arcs
How did you align the 2 mounting fittings at station 2? I ran a 1/4" rod through them back to the other 2 fittings at station 3, then welded them on. That set the arc for the main gear. I did have a little binding from the different arcs as you described, I just reamed the holes out for clearance. It didn't take much since the gear doesn't move much. I don't know if there is a better way though.
Hey guys, thank you all for the feedback. Scott,I have no problem with the hinge line at stations 2 and 3, gear leg pivots up and down fine. The problem is with the shock strut when spring suspension is to be used. The lower end needs to yaw fwd and aft when the wheel travels up and down. It can’t freely do this when the top is bolted between the two plates at the v-strut. I had a conversation with John B. today and he knew exactly what I was talking about. His suggestion is to install bearing rod ends, one on each side, at the top of the shock struts above the spring assembly’s. This will allow the lower ends to travel fore and aft as the wheel moves up and down. He feels as though most people don’t realize this problem even exists, and because of the limited travel of the gear up and down, bolt connections will wear in and things will be ok. I plan on using the bearing ends. I hope I have not created anymore confusion and thanks again for everyones helpMark
Awesome! Is that a threaded insert in the tubing end? Did it also come from a race supply house? I have seen the ends, but not the threaded insertsThanks ScottMark
I avoided all this extra work and weight by using 8 lbs of airpressure in the larger lawn tractor tires. I fly off of bumpy grass and it works great. I have no spring struts, the tires do it all. Took 5 lbs off the plane, even with heavier tires.
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