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03-06-2020, 01:58 PM
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Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 1,005
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Got mine at Cabella's, & it's replacement at Bass.
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Ralph
built a few RVs, rebuilt a few more, hot rodded some, & maintained/updated a bunch more
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03-06-2020, 02:07 PM
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been here awhile
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Join Date: Dec 2004
Location: North Alabama
Posts: 4,301
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Quote:
Originally Posted by Ironflight
Well....that really had nothing to do with the the original intent of the post, which was to point that you can siphon 16 gallons out of the tank before you have to drain the rest out the drain valve.
We can start a whole new thread on how to safely drain tanks if you’d like!
(BTW, yes - I had everything grounded with alligator-clip jumper wires, both when siphoning and when draining)
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I just found it interesting that most any time there is a thread about fueling from a can that only 3-4 posts into the thread there are those saying we are about to blow ourselves up.......yet 18 posts into this thread and nobody had mentioned gasoline explosions with all the siphonin' and buckets and cans goin' on....... 
Last edited by Sam Buchanan : 03-06-2020 at 02:14 PM.
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03-06-2020, 04:49 PM
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Join Date: Jan 2005
Location: NC25
Posts: 3,508
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Quote:
Originally Posted by alpinelakespilot2000
Good point on the W&B. After 8 years flying I should probably do a new one to account for mods/additions done over the years.
Rather than siphoning out, is there any problem with just disconnecting the fuel line at the carburetor and turning on the auxiliary fuel pump just like we did when we tested fuel flow prior to Phase I? That seems lot easier, at least if the cowl is already off.
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It is a LOT less work to fill the tanks for the re-weighing, weigh the airplane with max fuel, and then subtract the weight of fuel out from the calculations.
__________________
Gary A. Sobek
NC25 RV-6 Flying
3,400+ hours
Where is N157GS
Building RV-8 S/N: 80012
To most people, the sky is the limit.
To those who love aviation, the sky is home.
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03-06-2020, 05:11 PM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,564
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Quote:
Originally Posted by RV6_flyer
It is a LOT less work to fill the tanks for the re-weighing, weigh the airplane with max fuel, and then subtract the weight of fuel out from the calculations.
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1. Do you know the *exact* arm of the fuel?
2. Do you know the *exact* density of fuel and its corresponding weight at the weighed temperature?
Without these two pieces of data, a significant error can occur.
Normally when emptying an airplane of fuel I use clean 5 gal. buckets with lids that I only use for this purpose.
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Please don't PM me! Email only!
Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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03-06-2020, 05:49 PM
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Join Date: Jan 2005
Location: NC25
Posts: 3,508
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Quote:
Originally Posted by rocketbob
1. Do you know the *exact* arm of the fuel?
2. Do you know the *exact* density of fuel and its corresponding weight at the weighed temperature?
Without these two pieces of data, a significant error can occur.
Normally when emptying an airplane of fuel I use clean 5 gal. buckets with lids that I only use for this purpose.
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1. Yes. I measured / calculated it when I weighed the airplane the first time. Airplane was weighed empty with unusable fuel, fuel truck called while still on scales, airplane fuel to max capacity while still on the scales, additional scale readings taken and recorded.
2. Yes. They test the fuel at the local fuel farm every day and include the specific gravity. It is easy to borrow their equipment and test what is in the tank of the airplane. In actual experience, I have found the difference to be so small that it is irrelevant for calculations on an RV.
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Gary A. Sobek
NC25 RV-6 Flying
3,400+ hours
Where is N157GS
Building RV-8 S/N: 80012
To most people, the sky is the limit.
To those who love aviation, the sky is home.
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03-06-2020, 08:13 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by rocketbob
1. Do you know the *exact* arm of the fuel?
2. Do you know the *exact* density of fuel and its corresponding weight at the weighed temperature?
Without these two pieces of data, a significant error can occur.
Normally when emptying an airplane of fuel I use clean 5 gal. buckets with lids that I only use for this purpose.
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I would also add, do you know the exact amount of fuel in the tanks?
Van's lists the fuel capacity of the -9 as 18 gallons a side. However, since my -9 is a taildragger, it holds more like 19 gallons a side. The reason is the fuel cap is perfectly horizontal when the tail is down. When I raise the tail to level the plane, the fuel cap position moves relative to the horizon and it won't hold that extra gallon of fuel.
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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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03-06-2020, 10:30 PM
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Join Date: Dec 2018
Location: Granada Hills
Posts: 820
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Quote:
Originally Posted by Vlad
I had to fix a leak once and two times had contaminated/low octane fuel.
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How do you determine you have low octane fuel? Pinging, detonation, or ???
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03-07-2020, 09:02 AM
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Join Date: Feb 2006
Location: Davis, CA, USA
Posts: 540
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about the same for a -7
I've done the same thing with my -7 several times. (for fixing a leak, and calibrating capacitive sensors)
The results were about the same.... Can siphon all but about 4 gallons.
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Jeff Caplins
California
RV7 N76CX
(started: Feb 2002 --> Completed: May 2016)
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03-07-2020, 12:26 PM
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Join Date: Jan 2005
Location: NC25
Posts: 3,508
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Quote:
Originally Posted by N941WR
I would also add, do you know the exact amount of fuel in the tanks?
Van's lists the fuel capacity of the -9 as 18 gallons a side. However, since my -9 is a taildragger, it holds more like 19 gallons a side. The reason is the fuel cap is perfectly horizontal when the tail is down. When I raise the tail to level the plane, the fuel cap position moves relative to the horizon and it won't hold that extra gallon of fuel.
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That was part of the process of building the airplane. Airplane was assembled and fuel measured as it was added to one tank. System was then primed, hose removed from carb, airplane placed in level flight attitude, and fuel pump ran till it started sucking air. Fuel measured was then subtracted from the fuel added to the tank to determine unusable fuel in one tank. Repeat for other tank.
__________________
Gary A. Sobek
NC25 RV-6 Flying
3,400+ hours
Where is N157GS
Building RV-8 S/N: 80012
To most people, the sky is the limit.
To those who love aviation, the sky is home.
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03-13-2020, 12:15 PM
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Join Date: Nov 2009
Location: Anchorage, Alaska
Posts: 457
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Fly is an option
I had a leaky rivet in my tank one time...took it up and flew it until there was only about 2 gallons in the tank, took out drain and ran it into a gas can...and yep, I grounded it while draining.
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Burke Wick
Flying RV 8
Anchorage, Alaska
VAF Dues Paid for 2020
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