RV10 ER Tanks

[tnelson]

If anyone needs the pass thru terminal for the Stewart Warner senders as Richard used, I have two sets available. Decided to go with Cies senders. Terminals were imported from AUS, so quick turnaround for US locations. PM for more info.

[jerseypilot83]

Hello guys this is my completed series setup with my ER tanks … thank you for your help :-)

http://https://youtu.be/QfiwEeveWwQ

[Richard Connell]

Originally Posted by jerseypilot83

Hello guys this is my completed series setup with my ER tanks … thank you for your help :-)

https://youtu.be/QfiwEeveWwQ

Great! One video that sums up the entire thread! Well done.
That’s a neat solution sticking the pass through there.
I’ve tweaked your link too btw.

[jerseypilot83]

thank you I appreciate it! :-) Being in the experimental catageory we are all here to learn something and I just wanted to pass it on to others as you did to me.

Thank you. Have you ever been to AirVenture??

PS It must be kick *ss to fly around Australia. I would love to do that one day with some ferry tanks but time will tell!!

[johwiltb]

Hey great video! I just received my ER tanks and will work on them when the wing kit comes in. One question I had for you was where did you end up sourcing the pass-thru hardware?
I appreciate you putting the video together, it makes a lot sense now that I can see it! Thanks! And thanks to Richard Connell, too!

[jerseypilot83]

hey John thank you for the praise. Yea, I was spending a week looking this up and doing research. Since these tanks are newer on the market there isnt really much help out there. I also posted a few videos on the wing spar alterations if you want to click on my link below for my YouTube channel. I was confused about a little and I had to read the plans several times. I got it though and the first tank was leak free effective this morning. I am doing the right side now and I'm pretty sure I can buid a second leak free tank :-) Fingers crossed!

I lived in AZ for 7 years. I went to ERAU in Prescott and then lived in Tuscon for 3 years. Miss it out there but not the Phoenix heat haha. Also miss In 'n Out:-(

here is the link for the pass through

https://www.racetronix.biz/p/bulkhea...yABEgJ9AfD_BwE

[johwiltb]

Originally Posted by jerseypilot83

hey John thank you for the praise. Yea, I was spending a week looking this up and doing research. Since these tanks are newer on the market there isnt really much help out there. I also posted a few videos on the wing spar alterations if you want to click on my link below for my YouTube channel. I was confused about a little and I had to read the plans several times. I got it though and the first tank was leak free effective this morning. I am doing the right side now and I'm pretty sure I can buid a second leak free tank :-) Fingers crossed!

I lived in AZ for 7 years. I went to ERAU in Prescott and then lived in Tuscon for 3 years. Miss it out there but not the Phoenix heat haha. Also miss In 'n Out:-(

here is the link for the pass through

https://www.racetronix.biz/p/bulkhea...yABEgJ9AfD_BwE

Awesome, thank you so much for the link, and yeah of course on the praise! I've enjoyed watching your videos, and actually decided to pull the final trigger on buying the ERs after watching your unboxing. They showed up super quick, even all the way out to AZ. I'm sure I'll be reading the plans a lot as well, so I appreciate you and the videos.

And yeah, I'm a fan of In 'n Out, definitely good stuff. I lived in MD for a bit for work, and I missed it quite a bit. Although I'll be honest, I miss Yuengling now being out here And very cool about ERAU! I'm actually going there now (my work is paying for it) going through their masters of space operations program, it's been a ton of fun.

Thanks again for the link, and bulkhead pass throughs are orders!

[Bill Boyd]

Basic DC electricity fascinates me so I'm drawn to threads like these despite my "lack of standing" - no ER tanks and no plans to add any.

I understand the desire to instrument everything as fully as possible to fully exploit the capabilities of our whiz-bang glass panels. The resistive float senders are not capable of accurate display of fuel quantity in RV wing tanks due to dihedral and their location. in the root end of the tank. The first portion of fuel burn from a full tank will not change the reading from the sender. I assume this is also true of the senders in the ER tanks in use here. Wiring them in series makes the most sense (although wiring them in parallel with a series resistor added to the ER sender should also give a "calibratable" and usable resistance curve). This will give a setup where the first portion of fuel burned from each tank is not measurable by the float senders, and the calibration curve will have two "flat spots" as the total fuel load fuel is burned off.

So a question arises - since we can't expect linearity from the float senders and we are almost certainly running totalizers in these sophisticated panels: why do we even need to equip the outboard/ER tanks with a sender at all? Seems we should have a good idea from the stopwatch and selector valve how much is in the ER tanks at any given time (or your roll trim requirement will tell you) - and once we get down to fuel levels that are critical to know for safety of flight, the senders in the factory tanks will let you monitor the burn of the final fifty gallons with good accuracy. If one lost track of fuel burn in the first sixty gallons (or maybe the ER tanks both sprang a leak in flight or a fuel cap popped off and was lost?) and was surprised to see the fuel in the inboard tanks already being consumed, it seems to me that the second sixty gallons, where accurate measurements are available with only inboard tank sensors, should give the pilot about five hours to arrive at a safe landing and sort things out on the ground.

Just my KISS bias creeping in I guess. Maybe there are regulatory requirements for every tank in the aircraft to have a gauge. I personally think I'd wire parallel or omit the ER senders altogether if I were to install extended range tanks. Are we sure the pass-through terminal insulators are gasoline-resistant in the long term? (We thought ProSeal was fuel-resistant forever until we started seeing evidence that maybe it wasn't).

If this was discussed earlier in the thread and the rationale was established, I apologize.

Carry on; fly safe.

[Mark33]

Originally Posted by Bill Boyd

……(snip)…..So a question arises - since we can't expect linearity from the float senders and we are almost certainly running totalizers in these sophisticated panels: why do we even need to equip the outboard/ER tanks with a sender at all? Seems we should have a good idea from the stopwatch and selector valve how much is in the ER tanks at any given time (or your roll trim requirement will tell you) - and once we get down to fuel levels that are critical to know for safety of flight, the senders in the factory tanks will let you monitor the burn of the final fifty gallons with good accuracy. Just my KISS bias creeping in I guess……

All 100% valid points and definitely not “needed”. I’m going with the CiES fuel senders in my -14 build with the ER tanks and have gone back and forth with trying to decide if I should put the duel senders or not. In the big scheme of things, and IMHO, the duel senders really don’t add very much complexity or cost but does give you that little bit extra utility. At this point, I’m planning on going with duel senders as well. However, with that being said, I definitely think the duel senders are a lot more of a want rather than a need.

[Richard Connell]

Hi Bill,
Theres another thread about the rationale somewhere.
Keep in mind its one tank, not an additional tank.
Its unlikely a certified plane would get away with having the gauges only read 60% of the tanks capacity. But yes you can fly like that. Most 10s have the same problem to a lesser degree.

cheers

Originally Posted by Bill Boyd

Basic DC electricity fascinates me so I'm drawn to threads like these despite my "lack of standing" - no ER tanks and no plans to add any.

I understand the desire to instrument everything as fully as possible to fully exploit the capabilities of our whiz-bang glass panels. The resistive float senders are not capable of accurate display of fuel quantity in RV wing tanks due to dihedral and their location. in the root end of the tank. The first portion of fuel burn from a full tank will not change the reading from the sender. I assume this is also true of the senders in the ER tanks in use here. Wiring them in series makes the most sense (although wiring them in parallel with a series resistor added to the ER sender should also give a "calibratable" and usable resistance curve). This will give a setup where the first portion of fuel burned from each tank is not measurable by the float senders, and the calibration curve will have two "flat spots" as the total fuel load fuel is burned off.

So a question arises - since we can't expect linearity from the float senders and we are almost certainly running totalizers in these sophisticated panels: why do we even need to equip the outboard/ER tanks with a sender at all? Seems we should have a good idea from the stopwatch and selector valve how much is in the ER tanks at any given time (or your roll trim requirement will tell you) - and once we get down to fuel levels that are critical to know for safety of flight, the senders in the factory tanks will let you monitor the burn of the final fifty gallons with good accuracy. If one lost track of fuel burn in the first sixty gallons (or maybe the ER tanks both sprang a leak in flight or a fuel cap popped off and was lost?) and was surprised to see the fuel in the inboard tanks already being consumed, it seems to me that the second sixty gallons, where accurate measurements are available with only inboard tank sensors, should give the pilot about five hours to arrive at a safe landing and sort things out on the ground.

Just my KISS bias creeping in I guess. Maybe there are regulatory requirements for every tank in the aircraft to have a gauge. I personally think I'd wire parallel or omit the ER senders altogether if I were to install extended range tanks. Are we sure the pass-through terminal insulators are gasoline-resistant in the long term? (We thought ProSeal was fuel-resistant forever until we started seeing evidence that maybe it wasn't).

If this was discussed earlier in the thread and the rationale was established, I apologize.

Carry on; fly safe.