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05-23-2012, 10:00 AM
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Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
Posts: 2,651
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great write up
Miles, you are right, that is a great write up. Thanks
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rockwoodrv9a
Williamston MI
O-320 D2A
Awaiting DAR Inspection
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05-23-2012, 03:31 PM
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Join Date: Jan 2008
Location: KTCY
Posts: 643
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Quote:
Originally Posted by airguy
... Yes it whittles away a bit at the margins but it still ends up well within "standard category" that you get on a certificated aircraft.
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Van says the margins belong to the engineers.... 
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Dave & Trina
RV-9A Flying  - 330 Hrs. Painted Finishing the interior.
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05-23-2012, 07:41 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by MauiLvrs
Van says the margins belong to the engineers.... |
Van's also says they do not manufacture airplanes.
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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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05-23-2012, 07:43 PM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,150
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Quote:
Originally Posted by MauiLvrs
Van says the margins belong to the engineers.... |
I'm an engineer for my day job.
I followed Pat Tuckey's layout very closely for my bird, the full writeup of step-by-step is in my builders log. I ran my fuel system very similar to his, with transfer pumps but no overboard fuel dump pumps.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now. 
Last edited by airguy : 05-23-2012 at 07:45 PM.
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05-24-2012, 01:10 AM
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Join Date: Jan 2008
Location: KTCY
Posts: 643
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Quote:
Originally Posted by airguy
I'm an engineer for my day job.
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I'm sure that Van meant that the margins belonged to HIS engineers.
Not anyone that wants to fiddle with his numbers.
I don't know how you fiddle with the margins when the margins are not published so you don't know how much of them you are biting into, unless you reverse engineer the entire aircraft. 
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Dave & Trina
RV-9A Flying - 330 Hrs. Painted Finishing the interior.
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05-25-2012, 08:18 AM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,150
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Quote:
Originally Posted by MauiLvrs
I'm sure that Van meant that the margins belonged to HIS engineers.
Not anyone that wants to fiddle with his numbers.
I don't know how you fiddle with the margins when the margins are not published so you don't know how much of them you are biting into, unless you reverse engineer the entire aircraft. |
Stress calculations can be run by any competent mechanical engineer, they don't belong exclusively to the guys that sell the components. If you are not comfortable playing in the "gray area" then by all means don't do it.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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05-25-2012, 09:12 AM
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Join Date: Apr 2006
Location: Vancouver island, BC Canada
Posts: 385
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Bill, it would be interesting to check the accuracy of your pyrex jug by weighing the contents. My Pyrex jugs used in the kitchen are not very accurate - they don't even agree with each other.
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Jim Green
RV7 tip up
IO360 Whirlwind 200RV
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05-25-2012, 09:17 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by jimgreen
Bill, it would be interesting to check the accuracy of your pyrex jug by weighing the contents. My Pyrex jugs used in the kitchen are not very accurate - they don't even agree with each other.
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Good thought. How much does a gallon of 100LL weigh and at what temperature should I weigh it at?
I know we all use 6 lbs a gallon but that is not the actual weight of a gallon of 100LL.
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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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05-25-2012, 10:09 AM
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Join Date: Mar 2005
Location: SE Florida
Posts: 1,499
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Quote:
Originally Posted by N941WR
Van's lists the fuel capacity of the RV-9 as 36 gallons, 18 a side.
Today when I recalibrated the fuel tanks on my RV-9 (Note, this is NOT a -9A) I was reminded that there is still a lot of space in the fuel tanks when they have exactly 18 gallons. How much more I found out today.
With the tail back on the ground, after the calibration, I was able to fit another gallon and a half in each tank. The best part was that the fuel wasn't up to filler neck when I stopped adding fuel.
Even with the extra capacity, I wouldn't recommend flight planning for the extra capacity.
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Bill,
If nothing else, that extra capacity would be useful when refueling at large airshows, like AirVenture or Sun N' Fun, where you can expect extended taxiing. Those extended taxi times can eat up a lot of fuel. No sense having to shorten a leg, due to fuel burned during an extended taxi.
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05-25-2012, 10:11 AM
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Join Date: Sep 2009
Location: Rochester, MN
Posts: 710
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Quote:
Originally Posted by N941WR
Good thought. How much does a gallon of 100LL weigh and at what temperature should I weigh it at?
I know we all use 6 lbs a gallon but that is not the actual weight of a gallon of 100LL.
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So if you can't trust the accuracy of a Pyrex jug, how will you trust the accuracy of your scale? |
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