From: Wayne Hicks Subject: COZY: FW: Cozy IV incidence settings Date: Sun, 24 Dec 2000 10:03:39 -0500 -----Original Message----- From: Nat Puffer To: Wayne Hicks Sent: 12/23/00 10:18 AM Subject: Re: Cozy IV incidence settings Dear Wayne, Thank you for calling this mis-information to my attention. Perry Mick is wrong, and please publish a correction on the canard aviator's list. The canard on the Cozy has always been set at a higher angle of incidence than on the Long EZ. This was true of the GU canard on the Cozy III, Vance Atkinson's drawings for the Roncz canard on the Cozy III, and the Roncz canard on the Cozy Mark IV. The reason for the greater angle of incidence is to off-set the lift generated by the wider fuselage on the Cozy III and IV as compared to the Long EZ, and prevent the angle of attack becoming great enough to stall out the main wing. In the first edition Mark IV plans, it was specified that the top of the elevator travel checking template "G" should be level when the longerons were level, and this provided the extra canard incidence as compared to the Long EZ. In 1991, after the plans were printed but before anyone was flying, it was discovered that the canard contour checking template "F" did not agree with template G, and if builders used template "F" to set the incidence, it would not be correct. So a design correction was published in the October '91 Newsletter 35, page 6, to change the top of template "F" to agree with template "G". In the 2nd edition plans, template "F" was changed to agree with template "G" before they were printed, so either template could be used to set the canard angle of incidence, and it would be correct. In Newsletter #56, page 5, a chart was published so that builders could determine by elevator position whether their canard was set at the correct angle of incidence, and builders were instructed to add this to their Owner's Manual, page 46, and make this determination before expanding their flight envelope. Perry Mick's last newsletter was #53. The Cozy construction manuals state that the plans are obsolete unless updated with corrections published in the newsletters. We have discussed the importance of having the correct angle of incidence on the canard many times in our newsletters, and will continue discussing it, because the angle of incidence must be correct to have the right flying qualities and the protection against main wing stall. To summarize; template "G" has always been correct in both the 1st and 2nd edition plans. Template "F" was not correct in 1st edition plans, but builders were instructed to correct it in Newsletter #35 in 1991. No correction is need in 2nd edition plans, because both template "F" and template "G" were and are in agreement. Best regards, Nat PS: Maybe you should republish it to the Cozy_Builders as well ---------- > From: Wayne Hicks > To: 'Puffer, Nat' > Subject: FW: Cozy IV incidence settings > Date: Saturday, December 23, 2000 9:20 AM > > > Happy Holiday! > > Nat: > This was posted to the Canard Aviator's Group. > I'm forwarding it to you in case you don't subscribe to canard aviators. > I've always thought that the Cozy IV canard templates were all at zero > degrees incidence, and if that's true, then this "misinformation" needs to > be corrected before someone calls it fact? :-) > > > ================================ > Wayne Hicks > Cozy IV Plans #678, Chapter 19 Wings > http://www.geocities.com/yosemite/falls/2027 > > > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > -----Original Message----- > From: Perry Mick [mailto:pjmick@viclink.com] > Sent: Friday, December 22, 2000 10:18 PM > To: Canard Aviators > Subject: [c-a] Re: Pitch Trim > > > [The Canard Aviators's Mailing list] > > > Just discovered something interesting. When the Cozy IV came out with the > Roncz canard, it had the > same canard incidence as the Long-EZ. I know this because I just compared > Cozy IV incidence > checking template "F" with the Long-EZ template and they are the same. > > In October 1996 a canard template "G" was introduced for the Cozy IV, that > had 0.83 degrees more > incidence on the canard than "F". > > -- > Perry J. Mick > Duckt N7XR > http://www.ductedfan.com > > > \ > ->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>-|- > / > -For details on sponsors of this list, copyrights, and how to remove > -yourself from this list, please visit: > > http://www.canard.com/canard-aviator-sponsors.html > > (c) 1997,1998, 1999, 2000 Canard Aviators. support@canard.com > / > -|-<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< > \