Horizontal Stab Questions

[kitfoxrk]

When adjusting the horizontal stab, how critical is the 7/16" +/- 1/16" clearance between the stab and fuselage at the upper limit of travel. All of the posts I have seen have been about not being able to get that much clearance. I have the opposite problem. With the actuator arm fully extended, I get about 1" clearance. Is this a problem? And if so, is there a remedy?


My second question is on the attachment of the H-stab strut to the H-stab. Where the rod end attaches to the H-stab, the manual calls for a spacer - part#11501.000. Can anyone tell me the dimensions of this spacer and the material it is made of. I have not been able to locate them in my parts.


Thanks in advance for any help


Bob

[Frontier Fox]

Hey Bob
I can’t help you with your first question, haven’t gotten that far yet.

On the second question the spacers you are having trouble finding, part number 11501 is 1/4 inch long and appears to be the same material as the elevator bearings. I think it is referred to as a stand off.

Best of luck.

[jrevens]

Bob,

I’m sure they’re made of 4130 chrome moly steel tubing, probably reemed to the proper ID. You could order them from Kitfox... I’m sure they can’t be very expensive.

[aviator79]

Just a dummy check: You set that distance by rotating the trim motor shaft while the rod end is attached to the stab so that you screw the rod end in or out. You're at the max safe extension of the rod end, and still have 1" spacing? It does seem odd. You might email Kitfox with some pictures to make sure you're not missing something obvious. For that matter, you could post them here too so the experts can chime in.

[jiott]

Adjusting that clearance moves the whole range up or down; the range doesn't change. I was able to get pretty close to the clearance specified in the manual; however when I started flying it I found that I couldn't get near enough nose-up trim with full flaps deployed. So I adjusted that clearance to a larger value to move the range down so that when I ask for maximum nose-up trim the HS front tube is at the very bottom of the slots in the tail access panels. This is much better with full flaps but still requires some elevator back pressure on a full flaps landing approach. There is still plenty of nose-down trim for any situation.

[efwd]

Thanks Jim. Very helpful.