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08-22-2013, 10:05 AM
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Join Date: Dec 2004
Location: Gold Hill, NC25
Posts: 2,400
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Quote:
Originally Posted by rv7boy
Mike, where is the link to the description and ordering information for the inertia activated shutoff switch? I don't see it on the above page or on the linked pages.
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We used this one.
https://www.pegasusautoracing.com/pr...s.asp?RecID=87

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Kahuna
6A, S8 ,
Gold Hill, NC25
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08-22-2013, 10:13 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Quote:
Originally Posted by AndyRV7
One question. Does 100LL ignite by hot metal?
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Yes, if the metal is hot enough.
http://www.skybrary.aero/index.php/Ignition_of_Fuels
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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08-22-2013, 10:34 AM
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Join Date: Oct 2008
Location: Lake Country, B.C. Canada
Posts: 2,416
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fuel cell foam?
the Pegasus auto racing site also shows a yellow fuel cell foam that can be cut to any size and fit to fuel tanks.....albeit during construction for our tanks.
As I understand it dampens shock wave formation that causes tanks to explode, and slows leakage, and reduces combustible air/fuel vapour mixtures inside the tank. $54 for an 8x8x8" cube, E85 resistant.
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Perry Y.
RV-9a - SOLD!....
Lake Country, BC
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08-22-2013, 10:54 AM
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Join Date: Jul 2005
Posts: 1,346
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Aim for water?
Uh-oh, here we go again....
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Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS, L3 Lynx NGT-9000
N164WM
N184WM reserved (RV-8)....finishing kit in progress. Titan IOX-370
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08-22-2013, 11:10 AM
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Join Date: Sep 2007
Location: Hudson County, NJ
Posts: 1,092
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Quote:
Originally Posted by Mike S
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Interesting. Thanks.
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08-22-2013, 11:23 AM
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Join Date: Mar 2005
Location: Issaquah, WA
Posts: 146
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Quote:
Originally Posted by flyboy1963
the Pegasus auto racing site also shows a yellow fuel cell foam that can be cut to any size and fit to fuel tanks.....albeit during construction for our tanks.
As I understand it dampens shock wave formation that causes tanks to explode, and slows leakage, and reduces combustible air/fuel vapour mixtures inside the tank. $54 for an 8x8x8" cube, E85 resistant.
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The problem with this stuff is it breaks down over time. Pegasus recommends changing it every 3 years because of the fact that it'll start clogging pumps and filters.
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Brandon
Issaquah, WA
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08-22-2013, 12:33 PM
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Join Date: Jan 2012
Location: up up and away
Posts: 312
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I have witnessed a decathalon that nosed over on landing with full tanks. The fuel simply leaked from the caps and vents and made a nice stream entering the cowl. There was no fire. Shutting off fuel would have had no effect in this situation. I know it is a high wing, but I think a similar outflow of fuel could happen in an RV sitting on its nose. Depending on how high the tail is, the fuel might reach a hot exhaust part. Just speculating, maybe somebody has seen an RV on its nose and can comment.
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08-22-2013, 03:20 PM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
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auto ignition temp of avgas 824?F / 440?C
ConocoPhillips
001769 - Aviation Gasoline, 100 LL
Date of Issue: 23-May-2007
Vapor Pressure: 5.5-7.0 psia (Reid VP) @ 100?F
Vapor Density (air=1): >1
Boiling Point/Range: 75-338?F / 24-170?C
Melting/Freezing Point: <-72?F / <-58?C
Partition Coefficient (n-octanol/water) (Kow): No data
Specific Gravity: 0.68-0.74 @ 60?F (15.6?C)
Bulk Density: 5.83 lbs/gal
Percent Volatile: 100%
Evaporation Rate (nBuAc=1): >1
Flash Point: <-35?F / <-37?C
Test Method: (estimate)
LEL (vol % in air): 1.5
UEL (vol % in air): 7.6
Autoignition Temperature: 824?F / 440?C
Stability: Stable under normal ambient and anticipated storage and handling conditions of temperature and pressure. Extremely
flammable liquid and vapor. Vapor can cause flash fire.
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
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08-22-2013, 08:55 PM
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Join Date: Oct 2006
Location: torrance, ca
Posts: 650
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These inertia switches were used on all Ford vehicles with EFI throughout the 90's up to at least mid 2000's: http://www.sensata.com/download/resettable-crash.pdf I even installed one in my injected '66 GTO. Install it near your main solenoid/contactor in series with your existing main bus switch wiring.
Heinrich
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08-22-2013, 11:45 PM
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Join Date: Oct 2012
Location: logan, utah
Posts: 405
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Remember me I landed in the soccer field ? I hit that park sign going 60+mph and it sliced right into the fuel tank. Still waiting for the fuel tank to be repaired btw. But I was happy that no fire occurred. I did not get the fuel off before the landing admittedly.
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Erik Mortenson
Rans S-20 low and slow
14 build working on wings
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