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  #21  
Old 10-11-2013, 04:33 PM
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rzbill rzbill is offline
 
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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.
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  #22  
Old 10-12-2013, 09:04 AM
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CharlieWaffles CharlieWaffles is offline
 
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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.
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  #23  
Old 10-12-2013, 10:23 AM
rocketman1988 rocketman1988 is offline
 
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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?
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  #24  
Old 10-12-2013, 10:36 AM
jwilbur jwilbur is offline
 
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Default 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/
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  #25  
Old 10-12-2013, 10:50 AM
tdk tdk is offline
 
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Default 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.
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  #26  
Old 10-12-2013, 11:53 AM
rocketman1988 rocketman1988 is offline
 
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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...
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  #27  
Old 10-12-2013, 03:03 PM
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CharlieWaffles CharlieWaffles is offline
 
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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..
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  #28  
Old 10-13-2013, 02:19 PM
jc11378 jc11378 is offline
 
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Default 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.
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  #29  
Old 10-14-2013, 01:13 PM
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ppilotmike ppilotmike is offline
 
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Default +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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  #30  
Old 10-01-2015, 04:49 PM
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Default Analog gauges

Do the Dynon converters work on an analog fuel gauge?
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