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10-11-2013, 04:33 PM
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Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,692
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I'll probably regret this post someday but.......
I did the capacitive sensors and did NOT cut the big access hole in the inboard rib. I didn't want to build in a useless leak path. I figured if I had a leak, the access hole would not be where I needed it anyway so I girded myself to cut the rear baffle if needed. All OK so far.
I used the Dynon capacitance to voltage convertors noted earlier in the thread. They work fine for me. The trick was figuring out the Y=MX+B numbers for the EIS 4000. Brantels basic data charting work was critical to my success there.
__________________
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.
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10-12-2013, 09:04 AM
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Join Date: Nov 2010
Location: West Linn, Oregon
Posts: 1,351
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In follow up, now that I am flying, in hindsight I should have just gone with floats. The capacitive senders work fine, but they don't measure anything about above 20 gallons in the tank due to the dihedral in the wing. And below there they are just as accurate as floats.
__________________
CharlieWaffles - But you can call me " Mark"
RV-10
N928MT
Flying - AKA Still Tinkering
Build Project Site
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10-12-2013, 10:23 AM
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Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,189
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It would seem that the floats would do the exact same thing. When the float is all the way up, there is still a lot of fuel "above" it in the wing due to the dihedral. So it won't really read correctly until it begins to drop.
The capacitive probes are the same, correct?
To me, it is more important to measure the quantity when near empty rather than near full but my question is, "Is there a way to get an accurate measure from Full to Empty with any kind of sender?". My biggest condition is that the fuel tanks are already built so running a capacitance probe the complete depth of the tank is out...
Anyone?
Bueller? Bueller?
__________________
Bob
Aerospace Engineer '88
RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...
Dues+ Paid 2019,...Thanks DR+
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10-12-2013, 10:36 AM
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Join Date: Dec 2010
Location: Culpeper, VA
Posts: 693
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longer capacitive probes
I used longer probes in my tanks to span two bays. It should read above where the floats would. Presumably you can get a capacitive probe to span the whole tank.
http://airplane.athomeinthewilburnes...e-fuel-probes/
__________________
-Joe Wilbur (N520LW)
Phase II - 11/2017
First flight - 8/2017
RV-10 Build Log
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10-12-2013, 10:50 AM
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Join Date: Nov 2007
Location: Columbia, Maryland
Posts: 59
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Capacitance probes read high?
I was busy installing Van's capacitance probes when I read that if you calibrate the probes for Avgas they will read high for fuel containing EtOH. That seemed like a safety issue to me, so I went with the floats.
__________________
Tom Kocher
Columbia, MD
RV-7 N616TK
Flying!
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10-12-2013, 11:53 AM
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Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,189
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yeah, ran across your build earlier. I have the QB tanks, so there is no way to span several bays.
Doesn't really matter, though. I am comfortable with fuel flow, totalizer, and gauges that read the last 20 gallons...
Couple that with the fact that the capacitance probes are already pro sealed in, well, I guess I'm good to go...
__________________
Bob
Aerospace Engineer '88
RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...
Dues+ Paid 2019,...Thanks DR+
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10-12-2013, 03:03 PM
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Join Date: Nov 2010
Location: West Linn, Oregon
Posts: 1,351
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I have found I closely watch the fuel computer consumption more than anything else - it is usually within .1 gallons of my actual usage. So the fuel gauges have become a backup and are there to remind me which take may be lower than the other, etc..
__________________
CharlieWaffles - But you can call me " Mark"
RV-10
N928MT
Flying - AKA Still Tinkering
Build Project Site
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10-13-2013, 02:19 PM
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Join Date: Jul 2009
Location: Dixon Ca
Posts: 91
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Cap. Fuel Indication
Well i went with the Vans kit. It was very cheap. I then made new plates to fit the rv-10 rib.
I will have very accurate indication since one plate is i bay from the filler opening and the other is 1 bay o/b from the i/b lowest bay.
Probe type sensors are not accurate enough due to they do not span the entire tank from the highest point of the tank by the filler opening to the lowest point at the fuel pick point.
The plate style does as close as can be.
It was very easy to install the 2 plates the bnc connector was very easy to install and seal up.
So if any one wants to contact me feel free my email is n864jf@gmail.com
I have alot of pics available.
One thing i did was add a additional mount screw where the vans lit onkly has you install 3 per plate. I used 2 mount points on the fwd part of the plate and 2 on the rear part of the plate.
__________________
John Cumins A & P for way to long
N864JF Reserved
Emp complete , slow build Wings Fuel Tanks Finished, ailerons, and bottom wing skins ready to rivet on. Working on Flaps
My Build log http://websites.expercraft.com/jcrv10
Home Base VCB Nut Tree
Eaa 1230 VP
VAF 2015 Dues Gladly Paid
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10-14-2013, 01:13 PM
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Join Date: Jan 2010
Location: Denver, CO
Posts: 1,967
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+1 for the "plate" cap set up
Just like John, I installed the Van's cap system, but made custom-sized plates to fit the 10 (Vans doesn't currently offer them for the 10). I'm not flying yet, but I believe they will offer accurate measurements from full to empty (or close to it).
However, I also installed float senders. The place for the floats is incorporated into the rib in the 10 kit, not mounted to the coverplate like in the other models, so my choice was either cover the holes or install the float senders too. I figure the added weight is minimal and it's nice to have the backup, should the cap senders not function adequately. My $0.02.
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10-01-2015, 04:49 PM
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Join Date: Jun 2006
Location: Port Orange, FL (7FL6)
Posts: 274
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Analog gauges
Do the Dynon converters work on an analog fuel gauge?
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Flying as of 1-12-2016!!!!!
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