---------------------------------------------------------- L29-List Digest Archive --- Total Messages Posted Tue 07/10/12: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:08 AM - Re: Re: Nitrogen to compressed air (Bill Geipel) 2. 07:19 AM - Re: Re: Nitrogen to compressed air (Jon Boede) 3. 12:38 PM - Re: Nitrogen to compressed air (Beegee5872) 4. 01:02 PM - Re: Re: Nitrogen to compressed air (Bill Culberson) 5. 01:55 PM - Re: Re: Nitrogen to compressed air (Jorgen Nielsen) ________________________________ Message 1 _____________________________________ Time: 12:08:40 AM PST US Subject: Re: L29-List: Re: Nitrogen to compressed air From: Bill Geipel People have done it (2) that I know of. Never will be as dry as nitrogen. I've used air for many years. No issues. But like I said, nitro is cheaper. All the way around. Bill On Jul 9, 2012, at 11:01 PM, "Beegee5872" wrote: > > Is there a possibility of installing an electric air pump with a drying filter and automatic pressure regulator to maintain a constant air pressure to the storage without refilling the nitrogen (or compressed air) tank on the ground? > > Bill G > > -------- > Bill > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=377836#377836 > > > > > > > > > > ________________________________ Message 2 _____________________________________ Time: 07:19:28 AM PST US From: Jon Boede Subject: RE: L29-List: Re: Nitrogen to compressed air There was a popular mod in L-39s to put in a vibrating pump to generate pre ssure to seal the canopies. This went well until a couple of them burst into flames and filled the cock pits with smoke. Your actual mileage will vary... but the longer I do this stuff (going on 1 1 years now) the fewer "improvements" I'm inclined to make to the old Sovie t Technology. Jon > Subject: L29-List: Re: Nitrogen to compressed air > From: Beegee5872@juno.com > Date: Mon=2C 9 Jul 2012 21:01:37 -0700 > To: l29-list@matronics.com > > > Is there a possibility of installing an electric air pump with a drying f ilter and automatic pressure regulator to maintain a constant air pressure to the storage without refilling the nitrogen (or compressed air) tank on t he ground? > > Bill G > > -------- > Bill > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=377836#377836 ________________________________ Message 3 _____________________________________ Time: 12:38:06 PM PST US Subject: L29-List: Re: Nitrogen to compressed air From: "Beegee5872" One would have thought that someone, some how, would design an on-board air pump for the L29 to push out 1200 to 2200 psi and not burst into flames to operate the front seal and braking system... Though nitrogen is relatively cheap, to be tethered to that external hose at the next airport is disheartening -------- Bill Read this topic online here: http://forums.matronics.com/viewtopic.php?p=377910#377910 ________________________________ Message 4 _____________________________________ Time: 01:02:47 PM PST US From: Bill Culberson Subject: RE: L29-List: Re: Nitrogen to compressed air I once thought that way, and now have to agree with Jon. The best thing I have done is to invest in a high frequency leak detector (Granger) and hunt down all those annoying leaks. 99% of them were 1/8th turns of a wrench of a system fitting. Now, my L-29 will hold 150 bars for 3-4 days and will stay above 50 bars for more than three weeks. If your system doesn't leak much, you won't use much. I have been using SCUBA air as that is the way I bought it with great luck. I put my air charge line in the nose compartment for trips; most cities have a SCUBA shop in case I somehow run out of air. I've been all over the south east and to Oshkosh twice from southern Alabama and never had a problem. If you convert to the high pressure Schrader valve and use Nitrogen, then any maintenance facility will have you covered. Bill Culberson N39DE -----Original Message----- From: owner-l29-list-server@matronics.com [mailto:owner-l29-list-server@matronics.com] On Behalf Of Beegee5872 Sent: Tuesday, July 10, 2012 2:38 PM Subject: L29-List: Re: Nitrogen to compressed air One would have thought that someone, some how, would design an on-board air pump for the L29 to push out 1200 to 2200 psi and not burst into flames to operate the front seal and braking system... Though nitrogen is relatively cheap, to be tethered to that external hose at the next airport is disheartening -------- Bill Read this topic online here: http://forums.matronics.com/viewtopic.php?p=377910#377910 ________________________________ Message 5 _____________________________________ Time: 01:55:13 PM PST US From: "Jorgen Nielsen" Subject: RE: L29-List: Re: Nitrogen to compressed air I sit somewhere in the middle of the 2 opinions.. Have also modified mine with a valve so I can close the air, that way when I get to the aircraft she has the same amount of air as I left it. Oxygen tanks replaced and doing duty as 2nd system. Onboard compressor has been done by an individual in Europe using an electrically driven cornelius compressor in the nose (ex IFF) compartment. ( Hi Jean!) Also been using scuba air for 7 years no problems. I think it comes down to personal circumstance - i.e. what sort of airports you fly to and therefore what sort of facilities you can expect. Be careful that battery terminals are fully secured / covered in such a way that they cannot be shorted by the metal part of the air charge hose. Jorgen -----Original Message----- From: owner-l29-list-server@matronics.com [mailto:owner-l29-list-server@matronics.com] On Behalf Of Bill Culberson Sent: 10 July 2012 22:05 Subject: RE: L29-List: Re: Nitrogen to compressed air --> I once thought that way, and now have to agree with Jon. The best thing I have done is to invest in a high frequency leak detector (Granger) and hunt down all those annoying leaks. 99% of them were 1/8th turns of a wrench of a system fitting. Now, my L-29 will hold 150 bars for 3-4 days and will stay above 50 bars for more than three weeks. If your system doesn't leak much, you won't use much. I have been using SCUBA air as that is the way I bought it with great luck. I put my air charge line in the nose compartment for trips; most cities have a SCUBA shop in case I somehow run out of air. I've been all over the south east and to Oshkosh twice from southern Alabama and never had a problem. If you convert to the high pressure Schrader valve and use Nitrogen, then any maintenance facility will have you covered. Bill Culberson N39DE -----Original Message----- From: owner-l29-list-server@matronics.com [mailto:owner-l29-list-server@matronics.com] On Behalf Of Beegee5872 Sent: Tuesday, July 10, 2012 2:38 PM Subject: L29-List: Re: Nitrogen to compressed air One would have thought that someone, some how, would design an on-board air pump for the L29 to push out 1200 to 2200 psi and not burst into flames to operate the front seal and braking system... Though nitrogen is relatively cheap, to be tethered to that external hose at the next airport is disheartening -------- Bill Read this topic online here: http://forums.matronics.com/viewtopic.php?p=377910#377910 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message l29-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/L29-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/l29-list Browse Digests http://www.matronics.com/digest/l29-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.