---------------------------------------------------------- RV-List Digest Archive --- Total Messages Posted Fri 09/22/06: 9 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:36 AM - Horizpntal Pitot Hunt (James H Nelson) 2. 06:23 AM - Re: Wing skin crack (Hopperdhh@aol.com) 3. 07:18 AM - Reiff Engine preheater (Tom & Cathy Ervin) 4. 08:25 AM - Re: Wing skin crack (John Jessen) 5. 09:06 AM - Re: Pitot Hunt (N395V) 6. 11:37 AM - Re: Young Eagles Fuel (JOHN STARN) 7. 12:11 PM - Re: Reiff Engine preheater (Ernie & Margo) 8. 03:13 PM - Re: Reiff Engine preheater (Mike Kraus) 9. 05:45 PM - Re: EGT Span (Kelly Patterson) ________________________________ Message 1 _____________________________________ Time: 05:36:49 AM PST US Subject: RV-List: Horizpntal Pitot Hunt From: James H Nelson --> RV-List message posted by: James H Nelson Chuck, I had on on my Cessna 195. Try that! Jim Nelson ________________________________ Message 2 _____________________________________ Time: 06:23:24 AM PST US From: Hopperdhh@aol.com Subject: Re: RV-List: Wing skin crack John, Like you, I have looked closely at the holes after dimpling, and see a roughness -- even though the holes were deburred before dimpling. For sure, a smaller hole would be more likely to have stress cracks after dimpling than a bigger hole, so no. 40 is the right drill to use, not 41 as some have done, or no drill at all. Maybe the best thing to do is to deburr the hole AFTER dimpling. But many airplanes have been built without doing this and none (that I know of) have fallen out of the sky due to skin cracks. Aluminum does fatigue and eventually all of the RV's will start cracking! Maybe in 50,000 hours? Dan Hopper RV-7A In a message dated 9/21/2006 11:45:52 A.M. Eastern Daylight Time, jjessen@rcn.com writes: I've matched drilled and deburred and dimpled and I still don't see a smoothness around the hole. I often see little nibbles or some such thing. Not cracks, but it does make me wonder if I'm doing things correctly. Should be smooth, should it not? John Jessen #40328 ____________________________________ From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of Jim Peoples Sent: Thursday, September 21, 2006 7:20 AM Subject: RE: RV-List: Wing skin crack Search the archives on 'match drill' and you will find there have been several lengthy discussions about this (March '04 and April '02, etc.)... in my mind there is a connection, in the mind of others there may not be. I will use my judgement, you will use yours... Perhaps this is why i am committed to building my own RV rather than buying one from somebody else. jp com/Navigator?RV-List (http://www.matronics.com/Navigator?RV-List) (http://www.matronics.com/contribution) ________________________________ Message 3 _____________________________________ Time: 07:18:46 AM PST US From: "Tom & Cathy Ervin" Subject: RV-List: Reiff Engine preheater List-Group, I have been trying to contact the Reiff people via Email and phone with no success? Are they still in business?? I need to install a preheater at my annual next month. Tom in Ohio (RV6-A) ________________________________ Message 4 _____________________________________ Time: 08:25:51 AM PST US From: "John Jessen" Subject: RE: RV-List: Wing skin crack Just makes one a little quizzical after all the preparation, but something has to happen with the deformation. John Jessen do not archive _____ From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of Hopperdhh@aol.com Sent: Friday, September 22, 2006 6:22 AM Subject: Re: RV-List: Wing skin crack John, Like you, I have looked closely at the holes after dimpling, and see a roughness -- even though the holes were deburred before dimpling. For sure, a smaller hole would be more likely to have stress cracks after dimpling than a bigger hole, so no. 40 is the right drill to use, not 41 as some have done, or no drill at all. Maybe the best thing to do is to deburr the hole AFTER dimpling. But many airplanes have been built without doing this and none (that I know of) have fallen out of the sky due to skin cracks. Aluminum does fatigue and eventually all of the RV's will start cracking! Maybe in 50,000 hours? Dan Hopper RV-7A In a message dated 9/21/2006 11:45:52 A.M. Eastern Daylight Time, jjessen@rcn.com writes: I've matched drilled and deburred and dimpled and I still don't see a smoothness around the hole. I often see little nibbles or some such thing. Not cracks, but it does make me wonder if I'm doing things correctly. Should be smooth, should it not? John Jessen #40328 _____ From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of Jim Peoples Sent: Thursday, September 21, 2006 7:20 AM Subject: RE: RV-List: Wing skin crack Search the archives on 'match drill' and you will find there have been several lengthy discussions about this (March '04 and April '02, etc.)... in my mind there is a connection, in the mind of others there may not be. I will use my judgement, you will use yours... Perhaps this is why i am committed to building my own RV rather than buying one from somebody else. jp com/Navigator?RV-List ="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navig ator?RV-List .matronics.com/">http://forums.matronics.com ronics.com/">http://wiki.matronics.com ://www.matronics.com/contribution">http://www.matronics.com/contribution ________________________________ Message 5 _____________________________________ Time: 09:06:28 AM PST US Subject: RV-List: Re: Pitot Hunt From: "N395V" --> RV-List message posted by: "N395V" You might try a 28V twin cessna pitot and see if 12v at 6 amps will give enough heat. -------- Milt N395V F1 Rocket Read this topic online here: http://forums.matronics.com/viewtopic.php?p=63239#63239 ________________________________ Message 6 _____________________________________ Time: 11:37:42 AM PST US From: "JOHN STARN" Subject: RV-List: Re: Young Eagles Fuel I'll talk to my pilots about the gas... We have an open house at APV on the first Saturday, Oct. 7th and something of a race. Time vs distance vs fuel burn estimates. If your free, drop by and enjoy a burger on us. No "official" meeting on the 7th. JACK ----- Original Message ----- From: randy banks To: AAYoungEagles Jack Starn Cc: AATowerBoss Tom Gummo Sent: Friday, September 22, 2006 5:53 AM Subject: Young Eagles Fuel Dear Jack, We need to take care of the fuel for your Young Eagles pilots that flew at our Airshow. Unless you have a better idea, please give me the gallons of fuel needed for each pilot, and their names and addresses so that we may mail them a check. We would like to visit at your next EAA/Pilots Association meeting if you might set that up. Stay well Jack, and thank you very much for all of your efforts! r Randy Banks home (760) 948 9594 cell (909) 964 3021 ________________________________ Message 7 _____________________________________ Time: 12:11:15 PM PST US From: "Ernie & Margo" Subject: Re: RV-List: Reiff Engine preheater Tom: Within the last month I have ordered the Reiff engine preheater from Van's catalogue (Page 16). It is fully installed and works perfectly. I set it up so that I can plug it in through my oil door. Perhaps you can deal with Vans or contact me off-line. Reiff may not sell direct. Don't know but I certainly had no reason to. I am very happy. ----- Original Message ----- From: Tom & Cathy Ervin List-Group, I have been trying to contact the Reiff people via Email and phone with no success? Are they still in business?? I need to install a preheater at my annual next month. Tom in Ohio (RV6-A) ________________________________ Message 8 _____________________________________ Time: 03:13:17 PM PST US From: "Mike Kraus" Subject: RE: RV-List: Reiff Engine preheater Reiff is still in business, I just purchased a heater from them for my RV-10. Purchased it directly. Try calling them, many small companies are not good at e-mail for some reason.... 262-968-2342 -----Original Message----- From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of Ernie & Margo Sent: Friday, September 22, 2006 3:10 PM Subject: Re: RV-List: Reiff Engine preheater Tom: Within the last month I have ordered the Reiff engine preheater from Van's catalogue (Page 16). It is fully installed and works perfectly. I set it up so that I can plug it in through my oil door. Perhaps you can deal with Vans or contact me off-line. Reiff may not sell direct. Don't know but I certainly had no reason to. I am very happy. ----- Original Message ----- From: Tom & Cathy Ervin List-Group, I have been trying to contact the Reiff people via Email and phone with no success? Are they still in business?? I need to install a preheater at my annual next month. Tom in Ohio (RV6-A) ________________________________ Message 9 _____________________________________ Time: 05:45:19 PM PST US From: "Kelly Patterson" Subject: RV-List: RE: EGT Span --> RV-List message posted by: "Kelly Patterson" My only experience with this issue was the result of carb ice. I was cruising at 17K, WOT and checking on my engine EGT's. The carb O-320 is not making much HP at this elevation, and DA of approx. 19-20K. The EGT's began to spread and this really puzzled me. Messing with the mixture did nothing. Remembering something I read on this list got me to pull the carb heat and see what happens. After a few seconds the EGT's were even again and I removed the carb heat. Didn't happen again, so I chocked it up to experience. Kelly Patterson RV-6A N716K Chandler, AZ O-320 carb 9.2:1 CR & Emag 108 hrs of good times Time: 04:04:46 PM PST US From: "Ed Holyoke" Subject: RE: RV-List: EGT Span --> RV-List message posted by: "Ed Holyoke" Steve, Carbureted Lycomings have lousy fuel/air distribution and the EGTs are gonna be all over the place. I've found that pulling off about a tenth of an inch of manifold pressure helps even out the fuel distribution and brings the EGTs closer together on our O-320. The slightly deflected throttle causes turbulence and better mixing. You can experiment with a touch of carb heat too which has a similar effect. If you use carb heat, you may need to re-lean a little to account for the extra richness. All that said, the EGT spread doesn't mean too much. Absolute EGT values aren't very important and could be off because of probe errors anyway. What you really want to watch for is changes in temperatures from the normal way it runs that might tell you something has happened. A rise in EGT in one cylinder might mean a fouled plug or a bad valve. A rise in all of them could be a bad mag. If your 170 degree spread is normal for your engine, you could always set the alarm for 180 and quit worrying or just keep punching the acknowledge button when the alarm goes off. Pax, Ed Holyoke -----Original Message----- From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of Steve Glasgow Sent: Thursday, September 21, 2006 2:32 PM Subject: RV-List: EGT Span --> RV-List message posted by: "Steve Glasgow" I have my EIS system set to 150 Max EGT Span. Sometimes at high power settings the warning light comes on indicating a span of greater than 150 F. When I look at the actual EGTs the span is between #1 and #4 cylinders and is sometimes as great as 170. A reduction in power extinguishes the warning light. Shortly there after, all EGTs are closer together and run somewhere between 50 25 of each other. At cruise and leaned out sometimes they are within 15 of each other. Is it normal for a 0-360 carburated engine to have more than 150 Span at high power settings? I have tightened the rubber intake connectors and changed plugs. Is it possible to have a sticking valve? Should I do a compression check? If this is normal, what is the highest span recommended? Thanks for any input you may have. Steve Glasgow-Cappy N123SG RV-8 Cappy's Toy 360 Hours