> On Oct 14, 2017, at 9:00 AM, [email protected] wrote: > > Message: 2 > Date: Sat, 14 Oct 2017 10:34:14 +0100 > From: Rogelio Serrano <[email protected] > <mailto:[email protected]>> > To: [email protected] <mailto:[email protected]> > Subject: KR> Mods for preventing flat spins in the kr > Message-ID: <[email protected] > <mailto:[email protected]>> > Content-Type: text/plain; charset=us-ascii > > According to nasa technical paper 1009. The kr tail is the worst design for > spin recovery. The combination A flat bottom and rounded top tail and the > position of the horizontal stab relative to the vertical stab is just the > right combination to go into a flat spin. > > Apparently just rounding the tail bottom will eliminate the flat spin mode > entirely. Leaving the top of the tail flat will be even better. Adding fins > can work too but requires testing. Other mods will be on the paper. > > You can find the paper here: > https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19770026167.pdf > <https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19770026167.pdf>
Interesting paper that mostly seems to point out two issues - 1) the more unshielded rudder the better for spin recovery (t-tail being least shielded). best change to the KR may be more below the stabilizer rudder. 2) unpredictable nature of best recovery procedure and mods. PS: The KR tail is configuration #3 - so not the worst - seemingly on the boarded between “satisfactory" and “unsatisfactory”. _______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/[email protected]/. 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 [email protected]
