I am using my CV time off to set up my stub wing. I will be using DD wing skins. Now I have to set Angle of Incidence. I was planning on 2% but now I see that 3.5% has been used. Does it make that much difference?
Sent from Mail for Windows 10 From: Jeff Scott via KRnet Sent: Monday, March 16, 2020 11:13 PM To: krnet@list.krnet.org Cc: Jeff Scott Subject: Re: KR> Dan Diehl's comment to Lee John, your statement is correct. Cruising at higher altitudes usually creates a situation where you are flying at a higher Angle of Incidence. Pilots often times incorrectly interpret the higher deck angle as AOA rather than AOI. The higher angle of incidence is not created by altitude itself, but is created by the lower amount of power available from a normally aspirated engine at a higher altitude for a given throttle setting and thus typically leaves you flying at a lower indicated airspeed. The lower indicated airspeed creates a higher angle of incidence for a given throttle setting at higher altitudes. It's a more complicated way of saying that at higher altitudes, the nose is usually a bit higher than while flying at lower altitudes. People take that basic truth for flying behind normally aspirated engines, then apply the wrong term by interpreting it as AOA rather than AOI. That should make it about as clear as mud. :o) -Jeff Scott Arkansas Ozarks > Sent: Monday, March 16, 2020 at 9:39 PM > From: "John Martindale via KRnet" <krnet@list.krnet.org> > To: 'KRnet' <krnet@list.krnet.org> > Cc: "John Martindale" <john_martind...@bigpond.com> > Subject: Re: KR> Dan Diehl's comment to Lee > > "cruising at higher altitudes lowers the AofA for a given indicated > airspeed". > > I think the above statement is incorrect. > > The weight of an aircraft and lift required to support it does not change > with altitude. Lift is proportional to airspeed, AoA, density and wing > design....the basic lift formula we are taught as students. > > Therefore for a "given airspeed" and weight and wing design that we cannot > alter in flight, as density decreases with altitude, AoA must be increased > up until the aircraft ceiling is reached when the AoA reaches the stall > angle. > > It is only if power is increased to increase the given speed that the AoA > can be reduced. > > Pleased to be corrected. > > John > > > John Martindale > Unit 39 > 40 Solitary Islands Way > Sapphire Beach NSW 2450 > Australia > > m:0403 432179 > email:john_martind...@bigpond.com > > snip > > Just thinking out loud here . . . but if angle of attack decreases with an > increase of indicated airspeed, and also with a decrease in air density . . > . cruising at higher altitudes lowers the AofA for a given indicated > airspeed, > > snip. > > > _______________________________________________ > 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 _______________________________________________ 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
