-1 Wing

[Saville]

VERY useful Ken. Thanks.

[N804RV]

Here's a pic I made from non -1 and -1 wing drawings. Compare this to the quoted description of differences in spar cap strip above.

[N804RV]

Originally Posted by Saville

Well I have conflicting data regarding what wing is on my -8:

Vans says it was the old 1550 wing design which was bought in 2000.

The logbook says the wing was replaced and/or rebuilt (unclear) and doesn't say when or what was done.

In many cases Vans has all the info you want. But what it cannot track is who did what, with what, and when.

I'm no expert. But, wouldn't that require a MAJOR rework of the fuselage center section? How would -1 wings be mated to a non -1 center section spar box?

[scsmith]

Originally Posted by N804RV

I'm no expert. But, wouldn't that require a MAJOR rework of the fuselage center section? How would -1 wings be mated to a non -1 center section spar box?

What is quoted in post #10 is ALMOST correct. The spar cap cross section is 1/4" deeper on the -1 spar, but the fore-aft dimension is the same, obviously, so that the spar will fit into the F-804 bulkhead/center section carrythough. All RV-8 spars are 1.437" fore and aft. The caps are 1.25 deep on the original wing, and 1.5 deep on the -1. You probably do not need to pull a wing to measure this - just remove the wing root fairing and you can see enough spar to measure.

[Saville]

Originally Posted by scsmith

What is quoted in post #10 is ALMOST correct. The spar cap cross section is 1/4" deeper on the -1 spar, but the fore-aft dimension is the same, obviously, so that the spar will fit into the F-804 bulkhead/center section carrythough. All RV-8 spars are 1.437" fore and aft. The caps are 1.25 deep on the original wing, and 1.5 deep on the -1. You probably do not need to pull a wing to measure this - just remove the wing root fairing and you can see enough spar to measure.

Thank you Steve. Very helpful. I'll make some measurements tomorrow and show what I've found.

[Saville]

Originally Posted by N804RV

Here's a pic I made from non -1 and -1 wing drawings. Compare this to the quoted description of differences in spar cap strip above.

Ok so the tank is off the plane making it easy to investigate so I took some measurements and pictures yesterday evening and I've concluded that I have a -0 wing.

See if you agree with me.

Referencing Ken's picture above, I took these shots:

This is the outboard end of the tank space. The spar cap stops before the next leading edge rib. So based upon Ken's picture above this strongly suggests a -0 wing.



Here is a picture of the spar at the wing root, where I took measurements:



At the bottom of the spar, the height of the cap is 1.25":




At the top of the spar, the cap is 1.25" x 1.25" as these two pictures show:





The 1.25" square dimensions comports with CHASKUSS' memory.

So it looks to me like I have a -0 wing.

Anyone see a mistake I may have made?

[rvbuilder2002]

Originally Posted by Saville

Ok so the tank is off the plane making it easy to investigate so I took some measurements and pictures yesterday evening and I've concluded that I have a -0 wing.

See if you agree with me.

Referencing Ken's picture above, I took these shots:

This is the outboard end of the tank space. The spar cap stops before the next leading edge rib. So based upon Ken's picture above this strongly suggests a -0 wing.

Yes, it is a -0 wing

[chaskuss]

Originally Posted by Saville

Ok so the tank is off the plane making it easy to investigate so I took some measurements and pictures yesterday evening and I've concluded that I have a -0 wing.

See if you agree with me.

Referencing Ken's picture above, I took these shots:

This is the outboard end of the tank space. The spar cap stops before the next leading edge rib. So based upon Ken's picture above this strongly suggests a -0 wing.



snipped

The 1.25" square dimensions comports with CHASKUSS' memory.

So it looks to me like I have a -0 wing.

Anyone see a mistake I may have made?

Greg,
You are correct. That first photo definitely shows the original style top spar cap. If it were a "-1" wing, the upper spar cap would extend beyond the inner rib of the leading edge. Thank you Steve for setting the record straight regarding the dimensions of the inner end of the spar cap.

Charlie
PS Perhaps you could have verified the length of the upper spar cap by removing the wing tip and looking inside. It might require the use of a video bore scope?