---------------------------------------------------------- RV9-List Digest Archive --- Total Messages Posted Thu 12/23/04: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:44 AM - Re: Re:Dynon pitot (Bob Kelly) 2. 11:39 AM - Re: Re:Dynon pitot (Steve Sampson) ________________________________ Message 1 _____________________________________ Time: 05:44:28 AM PST US From: Bob Kelly Subject: Re: RV9-List: Re:Dynon pitot --> RV9-List message posted by: Bob Kelly Leland, Understand the "homemade manometer," but would like to know where to get a chart of airspeed vs. inches H2O. Could you share that one? Thanks, Bob Kelly, fuse on main gear On 12/23/04, Leland wrote: > --> RV9-List message posted by: Leland > > Steve, I simply pressured up the pitot line and called it quits. A pitot > leakage of this sort is found on many Piper aircraft such as the Warrior > and Cherokee. When I performed a static test with a "calibrated" > pressure source, read that as "homemade manometer", the Dynon read from > 6% high to 2% low, while Van's analogue gauge read from three to five > percent low. I wonder what the error will be in flight. > Leland > Installing the empennage > >> After investigating a leak in the pitot line Dynon tell me not to worry >> since it has a drain built in and this is the leak. However it raises the >> issue as to how you test the pitot system if there is this leak, since it >> will disguise any other leak that may exist. What have others done? >> >> Thanks, Steve. >> #90360 >> >> PS One other thought, how much leakage can one have before it causes >> siginificant ASI errors? ________________________________ Message 2 _____________________________________ Time: 11:39:08 AM PST US From: "Steve Sampson" Subject: RE: RV9-List: Re:Dynon pitot --> RV9-List message posted by: "Steve Sampson" Leland - thanks for the reply. I dont quite understand. Since the Dynon head has a leak I cant pressurise the line. Well I suppose if I had a constant flow of air I could, but the leakage is not insignificant. Do you mean that you had a long loop of manometer so you kept raising one end as the pressure dropped? Did the 'calibrated' source supply air continuously? I am really puzzled about this. Since it is a drain according to Dynon it must leak quite a bit to pass water. Happy Christmas, Steve. PS It sounds as though we continue to be at abount the same point. I have ben fitting the empenage and general snags prior to pushing it into the hanger for the wings. -----Original Message----- From: owner-rv9-list-server@matronics.com [mailto:owner-rv9-list-server@matronics.com]On Behalf Of Leland Subject: RV9-List: Re:Dynon pitot --> RV9-List message posted by: Leland Steve, I simply pressured up the pitot line and called it quits. A pitot leakage of this sort is found on many Piper aircraft such as the Warrior and Cherokee. When I performed a static test with a "calibrated" pressure source, read that as "homemade manometer", the Dynon read from 6% high to 2% low, while Van's analogue gauge read from three to five percent low. I wonder what the error will be in flight. Leland Installing the empennage >After investigating a leak in the pitot line Dynon tell me not to worry >since it has a drain built in and this is the leak. However it raises the >issue as to how you test the pitot system if there is this leak, since it >will disguise any other leak that may exist. What have others done? > >Thanks, Steve. >#90360 > >PS One other thought, how much leakage can one have before it causes >siginificant ASI errors? > > This email has been scanned by the MessageLabs Email Security System on behalf of the London Business School community. For more information please visit http://www.messagelabs.com/email -- No virus found in this incoming message. Checked by AVG Anti-Virus. -- No virus found in this outgoing message. Checked by AVG Anti-Virus.