Why not try a sling seat like the Taylor mono plane and keep things simple. I can see that Alum seat cracking and your a$$ landing on the elevator cables and then what a mess
On Thu, Aug 30, 2018 at 7:14 AM Teate, Stephen via KRnet < krnet@list.krnet.org> wrote: > I think the decision of what kind of seat is every bit as important a > decision as to what resin or wood we use in our airplanes. I would say that > there is little argument as to the simplicity of the stock sling seat but > if you are going beyond that then it should require some real thought > especially when you consider the possibility of having a real bad day and > then that seat may be the only thing between you and concrete. > > > > I have resized and attached a photo of my two seat designs that I came up > with. The first one is the grey composite seat. Made by just cutting and > fitting foam between the spars all the way down to the bottom of the > fuselage with cutouts for the cross members of the fuselage floor so the > entire seat bears on the spars and bottom skin. Since it is solid foam I > liked the idea that should I have that bad day the glass would probably > fail pretty quickly but the foam would continue to absorb a load assuming > it stays in place. I am 6'-5" and I have already deepened my fuselage to > get the required headroom that I am going to need while wearing a headset . > Even by doing this I had to cut down the depth of the seat as much as > possible to get my butt as close to the bottom as I could. By doing this I > effectively destroyed the ability of my seat to take any real load. As it > loads up it will "form" itself to the available area between and over the > spars. As the load increases the bottom of the fuselage is going to flex > and the only thing that will hold the seat is the spars. Each side of the > seat becomes a shear web at this point but because of the depth of the seat > its load carrying ability is zilch almost regardless of how thick I make > them. And since most of the load of my reclined body will be on the aft > portion of the seat this is even worse. > > > > Now look at the aluminum version and remember this is really all because > of my height. By using a 1/8" sheet on the bottom I can get my butt as > close as I want it to be to the bottom of the fuselage. I then used the > same thickness of sheet to make 2" deep sheer webs on each side of the > seat. These span the full length from spar cap to spar cap and then over > the edges of both. The bottom has an "H" pattern of 1" x 1" x 1/8" angles > that span from sheer web to sheer web and the cutout for the stick is lined > in the same material. Also by bending the aft part of the seat from the > bottom slope to the horizontal I create additional stiffness. The back of > the seat is the same back as used on the composite seat and is hinged for > access behind them. Believe it or not there is not much if any difference > in weight between the two once the lightening holes are cut. Both versions > use the same cushions so it is fairly comfortable but the load carrying > capabilities are miles apart. > > > > And if you think this welding is bad you should have seen the intake > manifold on the old Subaru, downright breathtaking. > > > > Stephen Teate > Paradise, Texas > > > > > The information in this email is confidential and may be legally > privileged. > If you are not an intended recipient, you should delete this message. > Access to this email by anyone else is unauthorized, and any disclosure, > copying, distribution or action taken or omitted in reliance on it is > prohibited > and may be unlawful. > _______________________________________________ > 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
