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Old Aug 08, 2011, 11:24 PM
Master of the Wind
G Norsworthy's Avatar
United States, CA, San Jose
Joined Sep 2008
1,168 Posts
Finished the wiring harness, RDS, and joiners. All that is left is assembly and balance. Looking really good.
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Old Aug 09, 2011, 11:18 PM
Master of the Wind
G Norsworthy's Avatar
United States, CA, San Jose
Joined Sep 2008
1,168 Posts
All balanced and still a few hundred grams under. Just the wipers on the hinge lines and we are ready to fly.
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Old Aug 10, 2011, 10:43 AM
Registered User
Mt. View, CA, USA
Joined Nov 2009
27 Posts
XC#10 Flys Again

Glad to hear the fix is coming along nicely. It will be nice to get some test flying in before Cal Valley.
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Old Aug 10, 2011, 12:33 PM
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United States, CA, Union City
Joined Mar 2004
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Maybe in a couple weeks we can test fly and get distance pins. SVSS in a couple weeks??
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Old Aug 13, 2011, 11:12 PM
Master of the Wind
G Norsworthy's Avatar
United States, CA, San Jose
Joined Sep 2008
1,168 Posts
All fixed and we have a winch tomorrow.
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Old Sep 23, 2011, 09:16 PM
"Flying is my life!"
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United States, VA, Salem
Joined Oct 2002
295 Posts
Update

Awful quiet. So?

Whats next? We're all ready for your next project.
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Old Sep 23, 2011, 11:49 PM
Master of the Wind
G Norsworthy's Avatar
United States, CA, San Jose
Joined Sep 2008
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At Cal Valley now. Good run today. Neck and neck with the Supra. Next will be a second copy but that is a winter project. Supra is easier to fly but #10 may have a little edge in speed. Mostly comes down to pilot at this point.
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Old Mar 15, 2012, 11:02 PM
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Canada, BC, Kelowna
Joined Aug 2010
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Hi Greg, I have been lurking on your XCracer series for over a year. I fly genies (Harley) which are slightly smaller.

I am writing this to warn you that over winter my RDS coupler crumbled from acid residue I left inside the tube when I soldered the wiper arm in. New procedure calls for soaking the shaft in baking soda (2 tbs/pt) solution overnight.

Thanks for all your hard work, and also for documenting your work.

I am very interested in XC, maybe we shall meet someday.

Doug Wallace, Kelowna, Canada
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Old Mar 15, 2012, 11:02 PM
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Canada, BC, Kelowna
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Hi Greg, I have been lurking on your XCracer series for over a year. I fly genies (Harley) which are slightly smaller.

I am writing this to warn you that over winter my RDS coupler crumbled from acid residue I left inside the tube when I soldered the wiper arm in. New procedure calls for soaking the shaft in baking soda (2 tbs/pt) solution overnight.

Thanks for all your hard work, and also for documenting your work.

I am very interested in XC, maybe we shall meet someday.

sorry for duplicate post

Doug Wallace, Kelowna, Canada
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Last edited by rrcdoug; Mar 15, 2012 at 11:08 PM. Reason: duplicate
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Old Mar 16, 2012, 02:59 AM
dare to thermal
Mannheim, Germany
Joined May 2004
592 Posts
Greg,

do you know these articels:

http://scherrer.pagesperso-orange.fr...el%20flies.pdf
http://scherrer.pagesperso-orange.fr...late_OSTIV.pdf

I think it can help you in the developement of #11. Great job!

Bernd
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Old Mar 16, 2012, 02:09 PM
Master of the Wind
G Norsworthy's Avatar
United States, CA, San Jose
Joined Sep 2008
1,168 Posts
I did clean the RDS well in water after I made them. Hope all the acid came off. Baking soda is a good idea. I should check them after sitting this winter.

I did read those articles a while back. Very interesting. For now #10 will have to do until somebody goes faster than me. Season starts in about a week, weather permitting.
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Old Mar 16, 2012, 03:37 PM
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Cambridge, MA USA
Joined May 2001
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Quote:
Originally Posted by G Norsworthy View Post
I did clean the RDS well in water after I made them. Hope all the acid came off. Baking soda is a good idea. I should check them after sitting this winter.
I did read those articles a while back. Very interesting. For now #10 will have to do until somebody goes faster than me. Season starts in about a week, weather permitting.
I use this SS soldering method to completely eliminate corrosion risk:

First, clean all the SS components, and tin with solder using acid flux. This includes the inside of the SS tubes. Then clean off the parts completely, first using baking soda in water, and then some sort of solvent like acetone. Then assemble/solder the components using rosin flux.

Because the SS tube is tinned inside, and the wiper is tinned outside, you have to heat them while putting the wiper into the tube. But this is a not difficult if you have a big soldering iron.
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Old Mar 31, 2012, 01:37 AM
dare to thermal
Mannheim, Germany
Joined May 2004
592 Posts
Greg, how do you have calculated the horizontal tail (size, AR,..)?

Bernd
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Old Mar 31, 2012, 01:01 PM
Master of the Wind
G Norsworthy's Avatar
United States, CA, San Jose
Joined Sep 2008
1,168 Posts
Bernd,

I was fortunate enough to get the design as a package from Philip Kolb. The design is proprietary but I can say that the tail volume coefficient is .43.

That is a good number to start with for a T tail. I would stick with .42-.45. You can make a plane fly with a smaller stab but it may have problems on the launch.

The best reference for design is the Supra plans, both for aero and structure. Also you can take any of the popular J planes and use the fuse/tail proportions as long as you like the handling. The next step would be to use XFLR5 but I am not sure there is a lot to be gained in this area for the effort.

http://www.charlesriverrc.org/articles/supra/supra.htm

Good luck,

Greg
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