Making new spars for a 7BCM

s35pilot · Post by **s35pilot** » Wed Mar 26, 2008 09:34

Oh, why not!

................ Thanks guys!

Post by **joea** » Wed Mar 26, 2008 11:34

Jimmy Payne wrote:Tim,

I think I am a few years older than you, but will you adopt me?

Why didnt I think of this! Damm... and I am even closer!

Very nice work and cannot wait to see photos of your next work on the rest of the plane!

Joe

s35pilot · Post by **s35pilot** » Wed Mar 26, 2008 18:25

Hey Joe,
(wasn't that a song?) Your included......

I have decided (with your permission) to go ahead and do a thread on "building a 7 BCM wing" and "covering a 7BCM wing" but, remember, I will be learning as I go and if I don't find an answer locally, I will be looking for answers from the group.

I thought Nathan would be doing his but, I understand he's got to catch up on some customers work first.

Nathan, remember all work and no play

...........see you guys!

Post by **joea** » Wed Mar 26, 2008 19:33

Tim,

The problem with Nathan is that once he gets close to any power tools, it could be interesting, so we all stand back and just watch. He chimes in from time to time so at least he is out of the Emergency Room now.

Pls go ahead and do the threads that you mentioned above. Its a good thing to have pictures of how to do it. Any questions we will be glad to help.

Joe

Nathan K. Hammond · Post by **Nathan K. Hammond** » Wed Mar 26, 2008 23:33

Joe, I just sent the jointer knives off too get sharpened so make a clean cut, unlike that damn table saw.

Hopefully the spars will follow soon.

nkh

s35pilot · Post by **s35pilot** » Fri Mar 28, 2008 00:24

I screwed a couple of 2X4 to my saw horses and drilled holes part way in to recieve the all threads. " All set for varnishing".

I mixed the EV-400 as per the direction for brushing.
Nathan, was right on with his recommended procedure. I was trying to figure out how much it would take to coat the spars and not have to much left to throw away.
So, I decided to try 16 oz. Based on mixing instruction, 2 parts varnish to 1 part catalyst and thin to 50/50 I used 5 1/2 oz. varnish to 2 3/4 oz. catalyst to 8 oz. of thinner (close enough for goverment work) FAA, I'm just kidding. Anyway 16 1/4 oz's was just enough to do all 4 spars, had maybe a few brush fulls left.

I started at the butt end and worked towards the tip, then came back and put another coat on the end grain of the butt.

Next few coat will be sprayed, I have to wait until I recieve the new HVLP gravity feed with the 1.4 tip I ordered, should be here in a day or 2.

s35pilot · Post by **s35pilot** » Fri Mar 28, 2008 16:39

Just a quick note, If any of your old phenolic bushing were a bit loose, after you varnish they won't be, While varnishing, I made sure to get a coat down in the holes (sealing from any moisture), when I tried the bushing in today they were snug (nice fit).
Also, the EV-400 covered very well and sanded real nice, should end up with a nice finish after I spray a couple coats.

Post by **joea** » Wed May 28, 2008 14:21

Tim,

Been a couple of months since the last post on this thread.

Hows things going with the wings?

Joe

s35pilot · Post by **s35pilot** » Thu May 29, 2008 16:22

Hi Joe,
I just had to take a break and take care of my dogs illness (my best companion), I think we have the seizures under control now so, I will be getting back to the wings soon, hopefully in about a week.
I did get the final coats of varnish done about a week ago and getting ready for rib layout, I will start posting photos soon. Thanks for checking on me.
Tim

David Johnson · Post by **David Johnson** » Sat Aug 02, 2008 10:01

Tim and Tater(Nate): When you guys use the drag wire jig, be sure and assemble the wing compression members and check the fit of all the wires. I am having to go back and disassemble and open the holes up a little. I don't know what is going on. You can bolt this tool up to an original spar and the holes line up. I did not want you all to have to take apart a bunch of stuff like me! Let me know how it goes. David J.

David Johnson · Post by **David Johnson** » Sat Aug 09, 2008 06:53

Tim and Tater, I went back and looked at Tim's posts. He used a brad point bit. It may have prevented bit wandering. I used a standard drill. May have goofed. David J.

Nathan K. Hammond · Post by **Nathan K. Hammond** » Sat Aug 09, 2008 22:56

Where did it rub?

nkh

David Johnson · Post by **David Johnson** » Sun Aug 10, 2008 09:50

Dude, looks like my angles are slightly shallow. Like the bit took the shortest path thru the spar. Not by much. Just enough to keep the drag wire pulling up against the wood a little. What do you guys think? Anyone heard from our Pensacola Connection? David J.

Nathan K. Hammond · Post by **Nathan K. Hammond** » Mon Aug 11, 2008 13:46

Thanks for the heads up. Talked with Mark a couple weeks ago, he got ahold of a new engine that needed overhaul. Hopefully it came with a good set of mags!

nkh

s35pilot · Post by **s35pilot** » Mon Aug 11, 2008 23:51

Hi David,
Well, I'm back working on the plane again and just happen to check in tonight and saw your post. Did you use a 7/32 bit to drill the holes? Using the the jig and just follow the angle my wires slip in from both directions.