Pietenpol-List Digest Archive

Tue 09/29/15


Total Messages Posted: 5



Today's Message Index:
----------------------
 
     1. 05:18 AM - fuel tank progress (Douwe Blumberg)
     2. 07:48 AM - Magnetic Pickup for Crovair (Barry Davis)
     3. 10:07 AM - Re: Fuel tank progress/welding..... (aerocarjake)
     4. 11:21 AM - Re: fuel tank progress (aerocarjake)
     5. 10:08 PM - Re: fuel tank progress (taildrags)
 
 
 


Message 1


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    Time: 05:18:50 AM PST US
    From: "Douwe Blumberg" <douwe@douwestudios.com>
    Subject: fuel tank progress
    Hey Jake, Looks like a solid design and really nice sketch. You'll likely have to run the bolts in the other way but that'll make itself evident as you do it if the need arises. Yes, definitely ground it. You basically want a path from the tank down to the engine which is the largest chunk of metal in the plane, and where you will be grounding it while fueling. You can use grounding cable or other metal parts/cables/straps etc which were going that direction anyways and just build up a good solid "path" . if I remember correctly, since my fuel lines were running that direction anyways, I used them as part of the grounding system. Douwe


    Message 2


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    Time: 07:48:56 AM PST US
    From: "Barry Davis" <bed@mindspring.com>
    Subject: Magnetic Pickup for Crovair
    I attached an invoice from the company that supplied our pickups. Some people use the smooth one and fab up a tube on a bracket with a set screw to hold the sensor. This is the way WW did it at one time. After a lot of searching, I found the same sensor that is threaded and uses two nuts to adjust. This really works great as all you need is a bracket with a hole in it. Just slide in the sensor and tighten down the nuts when the adjustment is set. On the other one, the set screw dents the side of the sensor if it is tightened down too much. This dent makes it almost impossible to adjust tiny amounts unless you keep rotating it around to find an undented spot. I'm not making a recommendation, just what we learned from experience on the Big Piets. Barry NX973BP


    Message 3


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    Time: 10:07:33 AM PST US
    Subject: Re: Fuel tank progress/welding.....
    From: "aerocarjake" <flight.jake@gmail.com>
    Thx for the feedback, thoughts. I had not been particularly aware of the grounding aspect so I'll defiantly make a "pad" to mount a grounding strap - and run a strap to the frame - thanks! -------- Jake Schultz - curator, Newport Way Air Museum (OK, it's just my home) Read this topic online here: http://forums.matronics.com/viewtopic.php?p=447544#447544


    Message 4


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    Time: 11:21:15 AM PST US
    Subject: Re: fuel tank progress
    From: "aerocarjake" <flight.jake@gmail.com>
    thx Douwe - good thoughts..! Appreciate it........... -------- Jake Schultz - curator, Newport Way Air Museum (OK, it's just my home) Read this topic online here: http://forums.matronics.com/viewtopic.php?p=447545#447545


    Message 5


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    Time: 10:08:01 PM PST US
    Subject: Re: fuel tank progress
    From: "taildrags" <taildrags@hotmail.com>
    Grounding while fueling is a subject of interest to me. My last BFR was flown in a beautiful and brand-new C-172 with leather upholstery and all the options, that probably has as many dollars invested in the glass panel as in the entire rest of the airplane. I have never flown anything like it before or since. It belonged to a very high-time and competent pilot and instructor who had for many years owned and operated an FBO. When we pulled it up to the pump to fuel it up, he pshaw'd the notion of bothering with the grounding cable and clamp, saying that he had never heard of a fire caused by not grounding the airplane while refueling. OK... it's his plane. When I pull my Air Camper to the pump, I usually clamp the grounding clamp onto the open end of the exhaust stack, figuring that the stack is solidly bolted to the engine and the engine is grounded to the metal firewall through a braided strap that I installed myself for just that purpose. Everything of interest to me (no electrics on my plane) uses the firewall as the common grounding reference. The P-lead shields land on the same grounding bus on the firewall. The welded aluminum fuel tank on Scout is not grounded to the common grounding point, so it may really not do a lot of good to clamp the fueling ground cable to my exhaust stack unless I trace my way back, metal-to-metal, through the carb mounting studs to the carb and then to the metal AN fuel line fitting to the braided jacket on the fuel line to the metal gascolator, to the metal mount of the gascolator to the firewall. It might be a good path and it might not, and I can test it with an ohmmeter, but it would sure be easy to make a direct path by installing a piece of ground braid directly from the tank to the firewall grounding bus. I know that there are already plenty of things to worry about without over-thinking the grounding issue, but it's food for thought. Flowing fluid does create a static charge, and as the girl on Hee-Haw used to say, "and that's a fact!" -------- Oscar Zuniga Medford, OR Air Camper NX41CC &quot;Scout&quot; A75 power Read this topic online here: http://forums.matronics.com/viewtopic.php?p=447550#447550




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