---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Tue 03/02/21: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:55 AM - Stall warning airspeed for XS Mono (rparigoris) 2. 05:22 AM - Re: Stall warning airspeed for XS Mono (davidjoyce@doctors.org.uk) 3. 06:02 AM - Re: Stall warning airspeed for XS Mono (Brian Davies) 4. 03:30 PM - Re: Stall warning airspeed for XS Mono (rparigoris) 5. 04:06 PM - Re: Re: Stall warning airspeed for XS Mono (Alan Burrill) 6. 07:29 PM - Re: Re: Stall warning airspeed for XS Mono (Bud Yerly) ________________________________ Message 1 _____________________________________ Time: 12:55:43 AM PST US Subject: Europa-List: Stall warning airspeed for XS Mono From: "rparigoris" Hi Group What is favorite indicated airspeed to set factory stall warn to alarm at? Thx. Ron P. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=500834#500834 ________________________________ Message 2 _____________________________________ Time: 05:22:37 AM PST US From: davidjoyce@doctors.org.uk Subject: Re: Europa-List: Stall warning airspeed for XS Mono Ron, I was brought up n 5kts above stall speed. David, GXSDJ On 2021-03-02 08:55, rparigoris wrote: > > Hi Group > > What is favorite indicated airspeed to set factory stall warn to alarm > at? > > Thx. Ron P. > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=500834#500834 > ________________________________ Message 3 _____________________________________ Time: 06:02:25 AM PST US From: "Brian Davies" Subject: RE: Europa-List: Stall warning airspeed for XS Mono CS-VLA requirements ( guideline for us folks) : (c) The stall warning must begin at a speed exceeding the stalling speed by a margin of not less than 9,3 km/h (5 knots), but not more than 18,5 km/h (10 knots) and must continue until the stall occurs. Regards Brian Davies From: owner-europa-list-server@matronics.com On Behalf Of davidjoyce@doctors.org.uk Sent: 02 March 2021 13:22 Subject: Re: Europa-List: Stall warning airspeed for XS Mono Ron, I was brought up n 5kts above stall speed. David, GXSDJ On 2021-03-02 08:55, rparigoris wrote: to:rparigor@hotmail.com> > Hi Group What is favorite indicated airspeed to set factory stall warn to alarm at? Thx. Ron P. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=500834#500834 http://forums.matronics.cosp; - NEW arget="_blank" rel="noope ner noreferrer">http://wiki.matronics.com < - List Contribution Web Sit a href="http:/ /www.matronics.com/contribution" target="_blank" rel="n===== == -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ________________________________ Message 4 _____________________________________ Time: 03:30:30 PM PST US Subject: Europa-List: Re: Stall warning airspeed for XS Mono From: "rparigoris" Thanks for replies. What is approx. indicated airspeed when flying light weight and also near gross? I understand all aircraft will be a little different. I'm in the middle of wiring and want to add a 2mm super bright red LED on our Winter airspeed gauge close to where the needle would be about 5 knots above stall. Thx. Ron P. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=500840#500840 ________________________________ Message 5 _____________________________________ Time: 04:06:47 PM PST US From: Alan Burrill Subject: Re: Europa-List: Re: Stall warning airspeed for XS Mono Do you expect the stall, flapless and with flaps, to be significant different to the POH? Alan Sent from my iPhone > On 2 Mar 2021, at 23:33, rparigoris wrote: > > > Thanks for replies. What is approx. indicated airspeed when flying light weight and also near gross? I understand all aircraft will be a little different. I'm in the middle of wiring and want to add a 2mm super bright red LED on our Winter airspeed gauge close to where the needle would be about 5 knots above stall. Thx. Ron P. > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=500840#500840 > > > > > > > > > ________________________________ Message 6 _____________________________________ Time: 07:29:30 PM PST US From: Bud Yerly Subject: RE: Europa-List: Re: Stall warning airspeed for XS Mono Ron, The speed change is only a couple knots from 1300-1450 pounds. Stall speed is 49 KIAS at 1370. Once you calibrate your airspeed system simply set the horn/light during in flight testing. See your POH. Vstall is square root of Weight / (1/2 x rho x Cl x S) rho or density is .00238, Cl is about 1.6-1.7 and S is 100-110 square feet. Answer is in feet per second so do the conversion. 5 knots is the accepted lead airspeed for the various warning systems in the FARs unless the plane is a computer driven squirrel that needs stick shakers and trend indicators so they get exceptions. I do the stall speed horn tests with flaps up and down to get the ideal speed for my client. Some builders insist on pitot tubes that are not installed to be most accurate IAW manufacturers guidelines so calibration is necessary. The Europa Pitot/static of course is placed properly and very accurate. Instruments and pitot/static connections must be checked always prior to first flight in my opinion. What is on the gauge on the initial flight is a trend instrument without testing and verification. Stall strips reduce lift at the stall and the indicated airspeed of the stall stripped wing will be higher. The actual stall should be only a couple knots above an unstripped wing and the buffet typically 5 knots higher than that. I set the stall warning horn at the beginning of the burble if it is about 5 knots above stall. Close enough. Fine tune to desired. A super bright LED will not be welcome at night. A normal LED (1.5 to 2 volts) and horn has worked well for years, especially a flashing light. Don't over think it. I do not set the stall warning on my initial test flight. I fly my airspeed because my instrument guy checked my indicator and pitot/static system. GPS ground speed is my backup initially. If unable, put a suction on your altimeter to increase the altitude 1000 feet, A/S should read 135 Knots and both should be steady for 30 seconds. VSIs are designed to leak then should stabilize out so disconnect the VSI during this ground test. If it fails this initial test, something is wrong, go fix it. I've written before on this in more detail.. Best Regards, Bud Yerly -----Original Message----- From: owner-europa-list-server@matronics.com On Behalf Of rparigoris Sent: Tuesday, March 02, 2021 6:30 PM Subject: Europa-List: Re: Stall warning airspeed for XS Mono Thanks for replies. What is approx. indicated airspeed when flying light weight and also near gross? I understand all aircraft will be a little different. I'm in the middle of wiring and want to add a 2mm super bright red LED on our Winter airspeed gauge close to where the needle would be about 5 knots above stall. Thx. Ron P. Read this topic online here: https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fforums.matronics.com%2Fviewtopic.php%3Fp%3D500840%23500840&data=04%7C01%7C%7Cbed6027a5daa4ca4f2aa08d8ddd3d39c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637503249159937013%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=6ZjMXE%2FsJ1xtn5Kzew3Kze0XFKzvYOFrTo5MbdD4x68%3D&reserved=0 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/europa-list Browse Digests http://www.matronics.com/digest/europa-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.