SNB-w08 wing attach blocks
Posted: Tue Jan 11, 2022 2:19 am
by SP1
I’m a bit confused with the operations we need to do on the wing attached blocks. Are we supposed to drill them to 3/8 inch while on the spar (they start out at 1/4 inch), remove them to drill the blocks to 1/2 inch? That would leave the home on the spar at 3/8 inch. What’s confusing to me is that the directions car to use the drill guide to make the 3/8 inch hole, implying that the starting hole is larger than that.
Am I supposed to drill out the hole in the block 1st to 1/2 inch?
it also seems like this drill procedure should be done after the wing spars are mayed because that way you ensure the Spar pin holes will be aligned.
Re: SNB-w08 wing attach blocks
Posted: Tue Jan 11, 2022 6:04 am
by sonex1566
Hi there…HALT right there! I can only speak for the ‘A’ model, but the holes remain small, in my case at 1/4" diameter right up until mounting the wings to the fuselage. The idea is that you spend hours (in my case) fluffing around checking, double checking then doubting your self and then do some more checking to get your wings aligned as perfectly as you can in respect to equal dihedral either side of the fuselage, centred within the fuselage and the angle of attack correct to the fuselage and then once happy, well maybe go and make another cup of coffee first. And THEN proceed to drill the whole assembly, both wings and fuselage while clamped in position all at the same time up to the final bolt size in baby increments. Don’t go for gold on your first go. Do one hole at a time, put a bolt in and then work your way slowly and carefully through the rest of the holes. I am sure that if John Monnet was watching over my shoulder at the time he would have told me to just hurry up and get on with it, but I fluffed around for two days in total just to drill 4 holes. Good luck, my inner OCD just made me bloody slow.
Re: SNB-w08 wing attach blocks
Posted: Tue Jan 11, 2022 9:43 am
by bvolcko38
Amen brother! Proceed with extreme caution! <Follow the direction to the letter!!This is your last best chance to get a straight and true airframe. I bought some piloted double margin drill bits just for this task.
Re: SNB-w08 wing attach blocks
Posted: Tue Jan 11, 2022 10:32 am
by Bryan Cotton
I’m a big fan of drilling the spar to size on the press, and then using a bushing to locate the hole in the fuselage. I thought that became standard on the B model?
Re: SNB-w08 wing attach blocks
Posted: Wed Jan 12, 2022 12:17 am
by SP1
Hey guys, thank you for the very enthusiastic words of caution!
I am appropriately nervous on drilling these blocks. Just to clarify, I’m on page SNB-w08, not SNB-f02. Well, technically I am onSNX-wc02 since I’m doing a conversion.
Just making sure I don’t muck this up. Actually, reading through the wing rigging notes, it seems like really the best thing to do is to drill the wings and the wing attach holes in the fuselage together to 1/2 inch
[img]
29855B2D-80CD-43E8-B418-C8C090F1348B.jpeg
[/img]
Re: SNB-w08 wing attach blocks
Posted: Wed Jan 12, 2022 5:12 am
by garyb
Bryan Cotton wrote:I’m a big fan of drilling the spar to size on the press, and then using a bushing to locate the hole in the fuselage. I thought that became standard on the B model?
That’s how I did it too, much easier and accurate. My Sonex has 190 hours now and counting.
Cheers
Re: SNB-w08 wing attach blocks
Posted: Sun Jan 21, 2024 3:03 am
by alphapapafoxtrot
Hi, I am at WXB-W08 as well. I am having pretty much same confusion.
It seems that Sonex now wants us to do rigging without the fuselage for the B model.
I am worried with this procedure since the provided drill guide is not even concentric
PXL_20240121_065627484~2.jpg (46.71 KiB) Viewed 2984 times
Re: SNB-w08 wing attach blocks
Posted: Sun Jan 21, 2024 3:26 am
by sonex892.
alphapapafoxtrot wrote:Hi, I am at WXB-W08 as well. I am having pretty much same confusion.
It seems that Sonex now wants us to do rigging without the fuselage for the B model.
I am worried with this procedure since the provided drill guide is not even concentricPXL_20240121_065627484~2.jpg
It definitely doesnt look concentric. I can see swarf. I would first clean that up with a round file to make sure it isnt just the swarf making it seem non concentric. If it’s then not concentric, dont use it. Ask Sonex for a replacement. Or purchase some bushing stock.
When I used this method on my A model, it was at the time frowned upon Sonex, but believe me it is a lower risk method than the piloted drill method. That would be why they changed the procedure. I used bushing stock 3/8" OD x 1/4" ID bushing stock.
Re: SNB-w08 wing attach blocks
Posted: Sun Jan 21, 2024 6:20 am
by Kitfox93eg
I made my own drill bushing and purchased long bits. I also made an alignment pin from ground stock. If anyone wants to borrow them just email me and I’ll get them to you.
Ed Grasso
IMG_3770.jpg (47.67 KiB) Viewed 2967 times
IMG_3769.jpg (86.42 KiB) Viewed 2967 times
IMG_3768.jpg (69.95 KiB) Viewed 2967 times
IMG_3767.jpg (67.71 KiB) Viewed 2967 times
IMG_3766.jpg (70.71 KiB) Viewed 2967 times
IMG_3765.jpg (93.68 KiB) Viewed 2967 times
IMG_3764.jpg (116.58 KiB) Viewed 2967 times
Re: SNB-w08 wing attach blocks
Posted: Sun Jan 21, 2024 11:10 am
by Bryan Cotton
alphapapafoxtrot wrote:I am worried with this procedure since the provided drill guide is not even concentric
That should be concentric. Like Steve said, I’d deburr the end and have another look.
Nice job Ed! My A-model alignment bushings are out there somewhere… They have done a few airplanes. My neighbor made them for me.
Re: SNB-w08 wing attach blocks
Posted: Sun Jan 21, 2024 1:02 pm
by alphapapafoxtrot
Thanks Brian..
As I suspected, now Sonex instruct people to drill the up to 1/2" with just the two spars.
You did it as after put together with the fuselage. Is yours B model or A Model? It shouldnt make any difference
Re: SNB-w08 wing attach blocks
Posted: Sun Jan 21, 2024 1:42 pm
by Bryan Cotton
alphapapafoxtrot wrote:Thanks Brian..
As I suspected, now Sonex instruct people to drill the up to 1/2" with just the two spars.
You did it as after put together with the fuselage. Is yours B model or A Model? It shouldnt make any difference
Mine is an A model. I drilled the spars on my drill press, with the last pass using a slightly undersized reamer. That gave me a light press fit on my AN6 bolt. Then I built the wings.
Re: SNB-w08 wing attach blocks
Posted: Sun Jan 21, 2024 2:09 pm
by Kitfox93eg
IMG_3753.jpg (133.17 KiB) Viewed 1181 times
IMG_3752.jpg (110.71 KiB) Viewed 1181 times
My wings were already built as it was a conversion. I clamped the wings together and used a magnetic drill press to drill the blocks. Then rigged them to the fuselage and drilled the rear tunnel first then installed the front tunnel and drilled forward. It was a perfect fit without reamming.