-7 Horizontal Stabilizer Mounting

[Arie]

Michael, what is your distance from the vertical bars on the F711 to the front of the F710B angle. It should be 13 1/32inch, i am not saying mine are correct, but the front of my HS line up perfectly with the F710B.
Regards.
Arie

[mdevans9]

Tough to tell because of the angle of view, but it appears to me that the 710B and C are not positioned far enough aft. Perhaps the F-710 bulkhead is bowed forward?

Also, my plans show the distance from the forward edge of the HS rear spar to the aft edge of the HS-710 and HS-714 spice angles to be 12 3/16" - so you are right on with this measurement.

Best regards,

Merrill

[wirejock]

Is the angle the correct dimension material?
It looks right but if they made it from the wrong stuff, the flange may be too narrow.
Just a thought.

[mfleming]

Originally Posted by wirejock

Is the angle the correct dimension material?
It looks right but if they made it from the wrong stuff, the flange may be too narrow.
Just a thought.

My thoughts exactly...but I measured the F-710B angle and it's the proper 1" X 1".

[mfleming]

I just got off the phone with Van's and They are perplexed why the F-710B angle is too far aft. Everyones curiosity is up at Van's, they are pulling a -7 fuse down to take a closer look and will get back to me.

They also had me set up the stabilizer with better clamps and add the 3/16" spacers under the rear spar. This has brought the distance down to about ?" too far aft.

Although Van's doesn't know why (yet) everything is off, they said there's a couple fixes. Depending on if I can get an acceptable edge distance on both the F-710B angle and the HS-714 angles, I can split the difference and proceed to drill the stab in place. Otherwise if I can't get the edge distance they want me to drill off the deck and move the F-710B angle around to get things to line up.

Being that this is a QB fuse, I'm not keen on doing that and risking screwing up those AN4 rivets on my dime.

[rv8builder2014]

You are more than welcome to give me a call to discuss this issue if you have not figured it out yet. I'm sure we can work through it together.

Ryan A. Marshall
Synergy Air
541-844-6120

[mfleming]

Originally Posted by rv8builder2014

You are more than welcome to give me a call to discuss this issue if you have not figured it out yet. I'm sure we can work through it together.

Ryan A. Marshall
Synergy Air
541-844-6120

Thanks Ryan!

[mfleming]

Ryan Marshall from Synergy Air is the man!

After Ryan suggested I give him a call, I did and he figured out what was wrong in pretty quick order.

So the forward spar of the horizontal stabilizer is biased rearward by a little less the ⅛". This of course doesn't help my problem.

But the big issue was that the F-711C vertical bars were not square to the aft deck. In fact they were leaning aft by a hefty amount. Ryan said he always takes great care when installing the bars to get them perpendicular to the deck before riveting.

Well after a little tweaking, my F-11C bars are now square and the error is down to less than 3/16". I can make that work.

Wow what a head scratcher. Tomorrow the horizontal stabilizer goes on

[Arie]

Just a question, how did you tweak the F711C bars to be perpendicular to the aft deck?

[mfleming]

Originally Posted by Arie

Just a question, how did you tweak the F711C bars to be perpendicular to the aft deck?

Using a 24" crescent wrench with padded jaws. Slid the jaws down the F-711C vertical bars until near the deck. Using another wrench on the 24" wrench, I carefully straightened the F-711Cs.