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  #1  
Old 07-07-2018, 09:42 AM
n4322b n4322b is offline
 
Join Date: Jul 2014
Location: Scotland
Posts: 17
Default Horizontal Stabiliser - Zero Incidence

Following the build manual and using a 3/16 spacer under the rear spar of the horizontal stabiliser doesn't appear to produce the right result.
However with a 5/16 drlll the measurements seem to align i.e. the tooling holes are parallel to the longeron, F711 - the uprights, lie flat against the rear spar.
The low point in the skin is clear of the fuselage.
Has anyone else found the same ? Is it a typo in the manual ?

The front and rear spars are parallel - i.e. there is no twist that I can measure in the horizontal stab.
The fuselage was quickbuild and again I cant detect any misalignment.
I did ask the support guys but I'm guessing they are away on vacation.
Thanks
Ian
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  #2  
Old 07-07-2018, 11:56 AM
pilotkms pilotkms is offline
 
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Location: WARNER ROBINS, GA
Posts: 212
Default

Do u mean the F-711E spacer under the rear spar of the HS ? Check your measurements. I made it per plans and mine fit perfectly. Not sure what result u are expecting. U did put the 2 F-798 shims under the front spar also ? Have 125 flying hours and she flies fine.
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RV 7A RV #9700
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  #3  
Old 07-07-2018, 05:51 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,003
Default Spacers

Quote:
Originally Posted by pilotkms View Post
Do u mean the F-711E spacer under the rear spar of the HS ? Check your measurements. I made it per plans and mine fit perfectly. Not sure what result u are expecting. U did put the 2 F-798 shims under the front spar also ? Have 125 flying hours and she flies fine.
Mine was per plan as well.
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/01/2017. Plus a little extra.
RV-7A #73391, N511RV reserved (1,800+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #4  
Old 07-08-2018, 02:25 AM
Simon Hitchen Simon Hitchen is offline
 
Join Date: Apr 2006
Posts: 240
Default Mine too

Yeah, mine was per the plans and worked fine too.

I had a few of these moments during my build where I thought “surely I’m right and the plans are wrong”.. turned out to NEVER be the case LOL. Step back and go over everything you’ve done and study the plans, there will be something in there that will jump out at you and the light bulb will illuminate.

Obviously a change in incidence of the HS will have huge ramifications to the flight behaviour..
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  #5  
Old 07-08-2018, 09:42 AM
n4322b n4322b is offline
 
Join Date: Jul 2014
Location: Scotland
Posts: 17
Default

Quote:
Originally Posted by pilotkms View Post
Do u mean the F-711E spacer under the rear spar of the HS ? Check your measurements. I made it per plans and mine fit perfectly. Not sure what result u are expecting. U did put the 2 F-798 shims under the front spar also ? Have 125 flying hours and she flies fine.
Thanks for your comments.

Yes the two shims are in and I began by using a 3/16 drill under the rear spar.

Measurements have been back and forward several times now.
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  #6  
Old 07-08-2018, 09:45 AM
n4322b n4322b is offline
 
Join Date: Jul 2014
Location: Scotland
Posts: 17
Default

Quote:
Originally Posted by Simon Hitchen View Post
Yeah, mine was per the plans and worked fine too.

I had a few of these moments during my build where I thought “surely I’m right and the plans are wrong”.. turned out to NEVER be the case LOL. Step back and go over everything you’ve done and study the plans, there will be something in there that will jump out at you and the light bulb will illuminate.

Obviously a change in incidence of the HS will have huge ramifications to the flight behaviour..
Thanks for your comments. Yes I need to get this one right for sure.

I have't had too many of them - luckily. But a typo in the manual was a possibility that I think I can now rule out.
The measurements from longeron to tooling holes did not add up - several times, with 3/16 spacer.

An alternate route to checking zero incidence is my favourite - such as the relative positions of front and rear spars - awaiting Vans reply on that one.
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  #7  
Old 07-08-2018, 11:27 AM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
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Default Tooling holes

Quote:
Originally Posted by n4322b View Post
Thanks for your comments. Yes I need to get this one right for sure.

I have't had too many of them - luckily. But a typo in the manual was a possibility that I think I can now rule out.
The measurements from longeron to tooling holes did not add up - several times, with 3/16 spacer.

An alternate route to checking zero incidence is my favourite - such as the relative positions of front and rear spars - awaiting Vans reply on that one.
Double check the tooling holes are all in the correct position. I'm not sure if the are symmetrical with respect to the tooling holes. I they were installed opposite sides they might be fine in chord but tooling holes may be higher or lower. Just a thought.
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Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/01/2017. Plus a little extra.
RV-7A #73391, N511RV reserved (1,800+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #8  
Old 07-08-2018, 12:21 PM
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skylor skylor is offline
 
Join Date: Aug 2009
Location: Southern California
Posts: 634
Default Root Rib Tooling Holes

Quote:
Originally Posted by n4322b View Post
Thanks for your comments. Yes I need to get this one right for sure.

I have't had too many of them - luckily. But a typo in the manual was a possibility that I think I can now rule out.
The measurements from longeron to tooling holes did not add up - several times, with 3/16 spacer.

An alternate route to checking zero incidence is my favourite - such as the relative positions of front and rear spars - awaiting Vans reply on that one.
If it’s the tooling holes in the stabilizer root ribs that you are attempting to use for reference...well, I would not completely trust them. I recall that these particular ribs are sometimes misaligned where the flange is riveted to the fwd spar and this is evident by a slight distortion of the skin at the forward spar.

Skylor
RV-8
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  #9  
Old 07-08-2018, 02:59 PM
n4322b n4322b is offline
 
Join Date: Jul 2014
Location: Scotland
Posts: 17
Default

Thanks Skylor for that suggestion. I did check side to side for the tooling hole distance to the underside of the skin and in case that was as you suggested out of wad in some way. But nothing showed up all the check measurements were consistent.


I'll give it a day and go back through them again.

Thanks to all for the suggestions.

Ian
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