John, If you can get 2024T3 material instead of the 6061 it is much better. I know in the homebuild marked the 6061 is used very much because it is so easy to produce a part. But it is so very soft. As a prof sheetmetalworker I realy hate that stuf. It is nice to weld and very good corrosion recistant.
Stef > Op 22 maart 2019 om 13:28 schreef Rob Schmitt via KRnet > <krnet@list.krnet.org>: > > > John, > > Looks like Wicks still sells the 1 1/4 x 1 1/4 that is called for in the > plans. > > http://aircraftproducts.wicksaircraft.com/viewitems/aircraft-aluminum-metals/6061-t6-aluminum-c-channel > > Thanks, > > Rob Schmitt > > > > -----Original Message----- > From: KRnet <krnet-boun...@list.krnet.org> On Behalf Of Mark Langford via > KRnet > Sent: Friday, March 22, 2019 1:48 AM > To: Oscar via <krnet@list.krnet.org> > Cc: m...@n56ml.com > Subject: Re: KR> Bent Rudder Horn > > John Bouyea wrote: > > > I’m looking for help in finding real “aviation-grade” 1” OD 1/8” thick > > U-channel with radiused inner corners. Is there such a thing anymore? > > Where do you get it? > > I don't know that I have an answer either, but will throw out a couple > of options. I was going to point out that the sharp inside corner > channel is almost always the much weaker architectural 6063 aluminum, but it > looks like you've done your homework on that also. One would think nvAero > would be a source of this channel now, so maybe Steve will chime in on this, > unless he can't buy it either. > > Aircraft Spruce has some 1" square 60601-T6 tubing (see > https://www.aircraftspruce.com/catalog/mepages/alumtubing-sq.php), but it's > 1/4" rather than 1/8" wall. Of course there's the "minor" detail of having > to mill out one side to make the box into a channel, but that's quick work > for a guy with a mill. > > I was going to point you to onlinesmetals.com, but they don't have the > channel either. They do have some "rounded corner" box cross-section > material, which should work assuming there's no interference to rotation. See > https://www.onlinemetals.com/merchant.cfm?id=1761&step=2&top_cat=60 to see > what I mean by that. It has an outside radius as well as an inside radius. > > I probably haven't told you anything you didn't already know, and there are > other options as well, (larger channel with spacers, etc), but I'll spare > your time with that. For others, as a general rule, the sharp internal > radius angle and channel is 6063, which is not nearly as strong as 6061-T6, > and the sharp corner exacerbates the weakness, depending on how it's loaded. > If you're not sure what you have, but have some known 6061-T6, drill a hole > in it, and then try the mystery metal. 6063 drills like butter by > comparison! 6063 is a bit more shiny than 6061 also. Worst case though > would be to use 6063 and make sure you inspect it every year, or to be > absolutely sure, just use steel. That's not a huge amount of steel, although > the moment arm is long, and the change in CG direction is usually not > preferable. > > For 6063 in both 1" channel and 1.25" channel, see > https://www.onlinemetals.com/merchant.cfm?id=297&step=2&top_cat=6 . > That's probably the simplest option, but not the best. There are probably a > lot of KRs flying exactly this setup though.... > > Mark Langford, Huntsville, AL > ML "at" N56ML.com > www.N56ML.com > MMV Gathering CoHost > > _______________________________________________ > Search the KRnet Archives at > https://www.mail-archive.com/krnet@list.krnet.org/. > Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options. > To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org > > > _______________________________________________ > Search the KRnet Archives at > https://www.mail-archive.com/krnet@list.krnet.org/. > Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options. > To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org Steph and his dad are building the KR-2S see [http://www.masttotaalconcept.nl/kr2](http://www.masttotaalconcept.nl/kr2) _______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/krnet@list.krnet.org/. Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options. To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org
