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Carlos Sa

Joined: 13 Jan 2006
Posts: 96

Posted: Tue Oct 24, 2006 5:46 pm Post subject: picture of the day + question

Hello, listers



Here's a picture of the nose ribs (right outboard panel, CH601-HD) clecoed to the spar.

Probably one of the last -HDs being built these days...

The threaded rod with the wood blocks keeps the ribs parallel to each other. I only need to make

the first one perpendicular to the spar, and all the other will be in position.

The white stripes are pieces of masking tape that are holding rivet stems (steel), one on each

side of the flange (over kill, one would be more than enough). This way I'll be able to locate

the flange edges with a magnet when the ribs are covered with the skin. Already tested, and works

nicely.



Question: the construction manual says you should (a) rivet all the ribs to the spar; (b) rivet

the rear spar to the ribs (b) drill and rivet the rear (top and bottom) skins, and only then (e)

drill and rivet the nose skin.

I'm thinking that doing the nose skin first of all would make the fitting of the nose skin much

easier. But, I am afraid of painting myself into a corner - although I haven't seen a corner or

any paint...



Does anybody see any "gotchas"?



Thanks in advance for your insight



Carlos Sa

CH601-HD, plans

Montreal, Canada

do not archive (until a good answer is found )  )



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_________________
CH601-HD, plans
Montreal, Canada

planejim(at)bellsouth.net
Guest

Posted: Wed Oct 25, 2006 4:27 am Post subject: picture of the day + question

Carlos,



I built a 601HD 10 years ago. Your work looks great. I used the same method 

to hold the nose ribs when I built my Midget Mustang I ( many years ago ), 

the one and onle All Metal PDQ ( nearly 30 years ago ) and the HD. However, 

I suggest you use the construction sequence of installing the top and bottom 

aft skins first ( being very careful to keep the whole thing square and 

level as you drill and rivet ) before installing the nose ( leading edge 

skin ). You will probably use straps to pull the L/E skin into place. Having 

the rest of the wing square and level ( and secured that way ) is important 

when drilling the L/E skin in place. I built a twisted left wing the first 

time around - be careful.



Also be aware that the nose ribs, even though you have them secured with the 

wooden blocks and threaded rod, can still flex some. I would still put the 

thin black line down the center of the flange of all the ribs, including the 

nose ribs, before starting the drilling operation. When the 3/32" ( #40 

bit ) hole is drilled through the skin, you will feel better to see that 

black line just under the hole.



 That is a unique trick using the rivet stems taped to the edges of the 

flanges. I would never have thought of that and I've been doing this stuff 

for about 50 years.



Good luck with your building.



Jim Hoak 601HD Rotax 912UL  532 hours.

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agustafson(at)chartermi.n
Guest

Posted: Wed Oct 25, 2006 5:06 am Post subject: picture of the day + question

How do I get to see these "pictures of the day? The latest photo that shows 

up in the 'photoshare' site is in July.



Aaron Gustafson  do not archive

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craig(at)craigandjean.com
Guest

Posted: Wed Oct 25, 2006 12:00 pm Post subject: picture of the day + question

"pictures of the day" was just a phrase. Most of these have just been

attachments to e-mails. If you receive digests you don't get the

attachments. If you browse the lists on the Matronics web site you can see

the attachments.



-- Craig

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naumuk(at)alltel.net
Guest

Posted: Wed Oct 25, 2006 4:46 pm Post subject: picture of the day + question

Carlos-

    Fully rivet the bottom skin, then cleco the top skin, finally cleco the 

nose skin. Make absolutely sure you have the correct shims and NAIL THE SOB 

DOWN TO THE WORKBENCH!!! Movement is death! Picture attached. Notice my 

approach to squaring the nose ribs and the L blocks squaring the spar to the 

bench and holding things in place. 'Nuf said.

Bill Naumuk

HDS Fuselage

Townville, Pa

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gboothe(at)calply.com
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Posted: Mon Oct 30, 2006 4:56 am Post subject: picture of the day + question

Carlos,



Sorry for the late reply - just received last week's e-mails. Thanks for

sharing the idea of holding the position of the nose ribs. I managed to

overcome the problem, but it wasn't as pretty as your method. I may be able

to make good use on the center section, though.



By now you have surely received several responses to your question about

positioning the nose skin before the top and bottom skin. My initial thought

is that it would not work so well, for two reasons:



	1) The nose skin has to overlap the rear skins anyhow, which would

make fitting and drilling the rear skins difficult;



	2) Sometimes, a great amount of force needs to be applied to the

straps to get the nose skin to completely make the bend. Having the rear

skins already attached gives the ribs enough strength to hold up to that

force from the straps.



Of course, my experience is with HDS wings, which may be slightly more

difficult as the outboard nose ribs change in size (not sure how that

compares to HD wings).



Gary Boothe 

Cool, CA 

601 HDSTD, WW Conversion 90% done, 

Tail done, wings done, working on c-section

..Question: the construction manual says you should (a) rivet all the ribs

to the spar; (b) rivet the rear spar to the ribs (b) drill and rivet the

rear (top and bottom) skins, and only then (e)drill and rivet the nose skin.



I'm thinking that doing the nose skin first of all would make the fitting of

the nose skin much

easier....



Does anybody see any "gotchas"?



Thanks in advance for your insight



Carlos Sa

CH601-HD, plans

Montreal, Canada

do not archive (until a good answer is found )  )



__________________________________________________

En finir avec le spam? Yahoo! Courriel vous offre la meilleure protection

possible contre les messages non nollicités 

http://mail.yahoo.ca Yahoo! Courriel

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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