|
-
POSTING RULES
-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|
08-01-2014, 10:10 PM
|
 |
|
|
Join Date: Aug 2010
Location: Brookshire, TX
Posts: 1,032
|
|
Question about capacitive fuel senders
So I'm working on my left tank now, and tonight I pulled out the instructions for the capacitive sender to review before getting started. I was surprised to see that there's only one wire, which connects to both plates and then to the connector on the inboard rib.
I guess I'd assumed that with two plates in the tank, those two plates would act as the two plates for the capacitor, but obviously that's wrong. I guess the tank structure acts as the second plate, with the outer portion of the connector making direct contact with the rib?
This isn't make-or-break information or anything; I trust the instructions are correct. But I'm a curious guy, and I like to know how things work. 
__________________
Philip
-8 fuselage in progress (remember when I thought the wing kit had a lot of parts? HAHAHAHAHA)
http://rv.squawk1200.net
|
08-02-2014, 12:59 AM
|
|
|
|
Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,259
|
|
The reason there is only 1 wire is because the two plates are connected together in parallel. Total capacitance is a function of the plate area. The other side of the capacitor is actually the rib/skin of the tank. The BNC connector connects the skin to the outer connection of the connector, while the wire is the center conductor of the connector.
__________________
Ray Tonks
2020 Donation Paid
Titan IOX-370, Dual PMAGs, 9.6:1 Pistons, FM-150
RV-7 Fuselage in progress
* Cabin Interior - In progress
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
* Ailerons Complete
* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete
|
08-02-2014, 06:11 AM
|
 |
|
|
Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,690
|
|
Ray is spot on. Plates are one side of the capacitor and the rib is the other.
On a different subject, I want to make sure you know a tip about sealing the BNC. Fuel can wick through the stranded wire, under the sheath and through the BNC connector and ultimately out of the tank. (So I have heard) The tip is to cover all of the wire connections with proseal for a couple of inches up the wires. I did. No leaks.
__________________
Bill Pendergrass
ME/AE '82
RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
Yeah. The boss got a Silhouette Cameo 4 Xmas 2019.
|
08-02-2014, 08:56 AM
|
 |
|
|
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,931
|
|
Sealing wire
Quote:
Originally Posted by rzbill
Ray is spot on. Plates are one side of the capacitor and the rib is the other.
On a different subject, I want to make sure you know a tip about sealing the BNC. Fuel can wick through the stranded wire, under the sheath and through the BNC connector and ultimately out of the tank. (So I have heard) The tip is to cover all of the wire connections with proseal for a couple of inches up the wires. I did. No leaks.
|
+1
Seal the other ends and connections as well.
__________________
Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
|
08-02-2014, 09:21 AM
|
|
|
|
Join Date: Aug 2010
Location: Brookshire, TX
Posts: 1,032
|
|
Good info. Thanks guy, my curiosity is satisfied. Back to work... 
__________________
Philip
-8 fuselage in progress (remember when I thought the wing kit had a lot of parts? HAHAHAHAHA)
http://rv.squawk1200.net
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 01:53 AM.
|
Linear Mode
