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  #1  
Old 02-17-2020, 07:40 AM
Jeff Vaughan's Avatar
Jeff Vaughan Jeff Vaughan is offline
 
Join Date: Jan 2005
Location: West Chester, Pa
Posts: 609
Default Fuel tank dip stick

There have been some questions regarding my RV 12 fuel tank dip stick
Here goes. I made it from 1/4? square stick a spruce rib material from my current Pober Jr. ace project. I rounded one end. The stick bends slightly when inserted and it will travel all the way to the bottom of the tank. When I calculated the fuel tank sender I made a mark at each 2 gallon increment. I used a black ball point pen. Recently I installed a new CIES sender so I had the side of the tank open and I took the photo below. Using the dip stick you can also very accurately adjust the RED cube fuel flow.
https://imgur.com/gallery/lc25Jvh
https://imgur.com/gallery/6GRLlJw
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RV 12 N237VW ELSA
Northwing Navajo Trike N561VW
RV 7A N561EV Sold
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  #2  
Old 02-19-2020, 04:17 AM
Azjulian Azjulian is offline
 
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Location: Scottsdale, Arizona
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Could you post a picture with the stock alongside a tape measure so we can recreate it ?
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  #3  
Old 02-19-2020, 06:58 AM
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Jeff Vaughan Jeff Vaughan is offline
 
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Location: West Chester, Pa
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Send me your email Check your pm

Jeff
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RV 12 N237VW ELSA
Northwing Navajo Trike N561VW
RV 7A N561EV Sold
West Chester Pa

2022 donation current
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  #4  
Old 02-19-2020, 04:39 PM
rjtjrt rjtjrt is offline
 
Join Date: Mar 2006
Location: Australia
Posts: 802
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Quote:
Originally Posted by Azjulian View Post
Could you post a picture with the stock alongside a tape measure so we can recreate it ?
Jeff
Thanks for doing this.
I would also like a photo with tape measure.
PM with my email sent.
Thanks
John
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  #5  
Old 02-20-2020, 08:40 AM
seagull seagull is offline
 
Join Date: Dec 2019
Location: Highland, CA
Posts: 510
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I use the wood dowel a lot. It is absolute, no chance for error. I always had a problem reading it on a second dip if it had not dried out completely.
My fix was to brush a thin coat of JB Weld, (slow set) on the dowel. A heat gun helps thin it out for a even coat. Once dried sand it smooth with #240 and put the measure marks on with a sharpie. The contrast of the gas on the JB Weld makes reading it extremely easy.
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  #6  
Old 02-20-2020, 09:47 AM
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Piper J3 Piper J3 is offline
 
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Location: Hinckley, Ohio
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I question the accuracy of the 2 gallon mark at the bottom of your dip stick. The filler neck is positioned at the aft end of the fuel tank. The bottom of the tank is slanted toward the front side such that if only ~ 1 gallon of fuel is present it would be mostly distributed in the front portion of the tank and may not even wet the dip stick until additional fuel is added. I?m guessing at 1 gallon ? might be something less. So, the 0-2 gallon mark will be shorter than rest of the 2 gallon increments just because of the angle in the bottom of the tank. Once the dip stick is ?wetted? the incremental marks will be uniformly distributed. Can?t help myself ? retired engineer here?

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  #7  
Old 02-20-2020, 09:59 AM
bobnoffs bobnoffs is offline
 
Join Date: Jul 2012
Location: n. wi
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if it was me [and there was a time when it was] i would want to start with my tank empty and make my own marks on my own dipstick s i filled it.
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dakota hawk/jab 3300 built and flying. sold 6/18.getting serious about the 12. in the hangar now as of 10/15/19
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RV-12 airworthiness cert. 11/30/2021
first flight 7/25/2022
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  #8  
Old 02-20-2020, 11:33 AM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
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I just dip it with a length of translucent brake hose, put my thump over the end and see what the level is when I pull it out. I calibrated mine during initial tank fill at 5. 10, 15 and 20 gallons. The 20 gal mark puts you into the filler neck so the distance between 15 and 20 isn?t the same as the 5-10-15 intervals. It looks to me like once you get above the sloped bottom region the relationship is 1 gal=1?.
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  #9  
Old 02-05-2022, 05:25 AM
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rtlongdon rtlongdon is offline
 
Join Date: Jul 2020
Location: Stanwood, WA
Posts: 52
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Quote:
Originally Posted by Azjulian View Post
Could you post a picture with the stock alongside a tape measure so we can recreate it ?
Hey Jeff,

I'd also like a photo of your measurements.

Thanks so much for being willing to share your efforts!

PM Sent.

Regards, Russ
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  #10  
Old 02-05-2022, 09:38 AM
seagull seagull is offline
 
Join Date: Dec 2019
Location: Highland, CA
Posts: 510
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there are measurements in the first post here;
https://vansairforce.net/community/s...d.php?t=203012
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