I do not care for pop rivets. I think you have to use them on the Univair ribs because of the sharp edge of the stamping.
I was just stitching yesterday using that young lady's island/palm tree method. Goes really, really fast.
If you do go Univair, get that Milwaukee battery powered puller. Did a quick repair on a Citabria last month - pulled 25 rivets in what seemed like a minute flat!
Additionally, I believe you can order fully assembled wings from Dakota, not sure about Univair.
This looked like a thread to poke my question in. I'm rebuilding a left wing on my PA18-105 Special (flaps). I have the gross weight increase to 1750 already, but still 13 rib wings. I'm okay with that. I like the weight savings vs the increased gross. But I'm also spinning in my head btw 13 rib and upgrading to 16.
I recommend you call WipAire with very specific questions if the reason for going to 16 rib wings is a GW increase. First question; what are the approved models for your 2000 lb GW kit. Answer PA18(A)(S)-150. Period. No -135, no -125 no -105. No PA18-150 was ever produced with 13 rib wings, they all have 16 rib wings (if they are legal). For that matter no PA-18-105 was ever made with 16 rib wings. That in itself is a major alteration and would require a field approval or STC. Then ask them if they have any data pertaining to 13 rib wings and their kit. Answer; huba-huba-huba. I believe they may of HAD the data, but apparently don't have it anymore or never did have it. Ask yourself this question, if Wip has the data for 13 rib wings and the STC allows early airframes modified to 1750 (another issue Wip can't explain very well) why would the STC only be legal on -150 cubs? Another misnomer that floats around is "if I put a 150 in my PA18-125 I now have a PA18-150". Wrong. Your data tag states your model. No such thing as a PA18-160 or PA18-180. Made up sales gimmicks. I have had a field approval request at the FSDO for about five months to install the kit in a -135 with an updated fuselage and 16 rib wings (they don't seem able to figure it out). The Flight Manual Supplements (FMS) that come with the STC are specific for -150 cubs. You can't use a FMS not specific to your model. That's a problem that would require, at minimum, new FMS's. This is one example of a systemic problem with early model cubs and the litany of modifications out there and their legal application.There's a long thread on this topic on here, but the 13 rib wing is eligible for the Wip 2000 gross weight kit, I believe. So, if you're rebuilding one wing, and you want to go to the 2000 pound kit eventually, I'd buy the kit now, and incorporate it into the wing build on this wing. Then, when the other wing gets rebuilt, finish the kit.
MTV
I recommend you call WipAire with very specific questions if the reason for going to 16 rib wings is a GW increase. First question; what are the approved models for your 2000 lb GW kit. Answer PA18(A)(S)-150. Period. No -135, no -125 no -105. No PA18-150 was ever produced with 13 rib wings, they all have 16 rib wings (if they are legal). For that matter no PA-18-105 was ever made with 16 rib wings. That in itself is a major alteration and would require a field approval or STC. Then ask them if they have any data pertaining to 13 rib wings and their kit. Answer; huba-huba-huba. I believe they may of HAD the data, but apparently don't have it anymore or never did have it. Ask yourself this question, if Wip has the data for 13 rib wings and the STC allows early airframes modified to 1750 (another issue Wip can't explain very well) why would the STC only be legal on -150 cubs? Another misnomer that floats around is "if I put a 150 in my PA18-125 I now have a PA18-150". Wrong. Your data tag states your model. No such thing as a PA18-160 or PA18-180. Made up sales gimmicks. I have had a field approval request at the FSDO for about five months to install the kit in a -135 with an updated fuselage and 16 rib wings (they don't seem able to figure it out). The Flight Manual Supplements (FMS) that come with the STC are specific for -150 cubs. You can't use a FMS not specific to your model. That's a problem that would require, at minimum, new FMS's. This is one example of a systemic problem with early model cubs and the litany of modifications out there and their legal application.