lml@lancaironline.net Mailing List Archive

<<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> <<You give up a little with the SFS angle of attack because, as I understand it, there is no compensation for weight change and it rather gives you data based on gross weight to be conservative. However, it does a great job of computing G forces, angle of bank, airspeed and so on.>> Hmm.... Does the SFS unit actually know how many G's you're pulling? If so, the accuracy you credit it with should be good enough for stall warning, even if it assumes a gross weight. If not, it's no better than an airspeed indicator. I disagree with Marv when he says that only Jim's AOA indicator shows actual angles. In the flight test world, we used little tiny AOA vanes on long booms -- they were pretty good. Any system measuring the position of a vane should give a consistent reading and thus be good enough for stall warning, with the correction that must be applied when flaps are extended (which Jim's does). To put all this in perspective, I bought one of Jim's units when it first came out because I think it's an excellent product -- probably the best thing out there short of a vane on a flight test noseboom. However, I am begging him not to invent any more stuff. My airplane is getting heavier and my wallet lighter! - Rob Wolf [Hmmm, maybe I missed one of my own editorial comments... I don't remember saying that Jim's AOA instrument is the only one that shows actual angles. What I did say was that "Jim's AOA indicator is the only one that actually uses the wing to generate the AOA information" and as far as commercially available angle of attack indicators go, I still believe this to be true. Just to keep the record straight. <Marv> ] >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>