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  #31  
Old 07-25-2011, 11:25 AM
Driftdown Driftdown is offline
 
Join Date: Jan 2011
Location: Clearwater, Florida
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Good luck with the build.
Any chance of getting some pictures posted of the tank when its all done?
You just may have a market out there for it .......... ya' never know.
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  #32  
Old 07-25-2011, 12:09 PM
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Spartan939 Spartan939 is offline
 
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Location: Boise, ID
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i certainly will. its gonna take me a while to get to that point in the build though
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Last edited by Spartan939 : 07-25-2011 at 12:13 PM.
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  #33  
Old 07-25-2011, 01:49 PM
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gblwy gblwy is offline
 
Join Date: Jun 2007
Location: Perth, Scotland
Posts: 494
Default Baggage limit

Bit of a digression, but a bigger tank when full will obviously weigh more. Does anyone know what drives the 50 lb weight limit in the luggage area (conservatism?)? Under some loading conditions it may well be possible to add weight here without impacting the max gross or the CofG.

Thanks...Keith
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  #34  
Old 07-25-2011, 02:30 PM
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Spartan939 Spartan939 is offline
 
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Location: Boise, ID
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the tank on the '12 is in the cabin, so i assume CofG will not be an issue per say.
correct me if I'm wrong but an extra 5 gallons of gas would be about 30 lbs i believe. this probably would have to be negated from baggage unless you or your passenger weigh in at less then 190 lbs each.
i know i can't speak for everyone, but losing 30 lbs for another hour of flight would be a welcome tradeoff to me
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  #35  
Old 07-25-2011, 07:04 PM
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Spartan939 Spartan939 is offline
 
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Location: Boise, ID
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Quote:
Originally Posted by SteveinIndy View Post
You mean other than the tendency of them to burst open along welded seams (those being the "weakest point" when subjected to the hydraulic forces induced by impact applied to a vessel filled with a non-compressible fluid?
only a poor/inexperienced welder makes a weld weaker then the parent material

Quote:
Originally Posted by David Paule View Post
There's also the issue of the change itself - it would remove the aircraft from being an E-LSA. It would be an E-AB, I think.
i plan on going e-ab anyway. i like the idea of building my plane the way i like it, since its gonna be mine and all
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  #36  
Old 07-26-2011, 11:31 AM
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Bill_H Bill_H is offline
 
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Location: Marshall TX (KASL)
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Bursting? The current issue of Sport Aviation says Maule fuel tanks are welded aluminum (page 52.) Regarding weight in the baggage area, the floor support on both sides is symmetrical. A full tank weighs ~123 pounds. However, there seems to be some clearance underneath the tank, it is supported by 2 AN3 bolts to the main fuselage member and one AN4 bolt at the back to the rear bulkhead. Anything heavy placed on top of the tank is thus supported by the tank and by those bolts (and what they are connected to), not the baggage floor. Run your own scenarios.
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  #37  
Old 07-26-2011, 12:48 PM
terrye terrye is offline
 
Join Date: Feb 2010
Location: Vancouver, BC, Canada
Posts: 860
Default Welded Fuel Tank

Go for it. No reason not to try a welded fuel tank for the RV-12.

We used to use 5052-H32 when I designed highway tanker trucks and trailers. English racing cars of the 1960s used welded aluminum tanks on the spaceframe cars. They held up pretty well to crash impacts. Early ones were just plain aluminum. Later ones had fiberglass overlay outside and fuel cell foam inside. My Cessna 150 has welded aluminum tanks. They are made from two pressings, a top and a bottom with a turned out flange on the centerline which is then welded. My tanks are over 40 years old and there were over 15,000 Cessna 150s and 152s manufactured.

Consider making the RV-12 tank with turned out flanges wherever it is welded, this makes a pretty easy weld.
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  #38  
Old 07-26-2011, 04:44 PM
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RDOG RDOG is offline
 
Join Date: Apr 2009
Location: Propwash Airport (16X), Texas
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Quote:
Originally Posted by Spartan939 View Post
the tank on the '12 is in the cabin, so i assume CofG will not be an issue per say.
correct me if I'm wrong but an extra 5 gallons of gas would be about 30 lbs i believe. this probably would have to be negated from baggage unless you or your passenger weigh in at less then 190 lbs each.
i know i can't speak for everyone, but losing 30 lbs for another hour of flight would be a welcome tradeoff to me
Why don't you put a aux tank?
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  #39  
Old 07-26-2011, 04:51 PM
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Spartan939 Spartan939 is offline
 
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Quote:
Originally Posted by RDOG View Post
Why don't you put a aux tank?
theres an idea. it would be removable for when you don't need it
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  #40  
Old 07-26-2011, 05:16 PM
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RDOG RDOG is offline
 
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Location: Propwash Airport (16X), Texas
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We made an aux tank and it works great! It can be taken out to the gas station at your destination for fueling at out stations and used as a fueling tank or put back in for travel. There is a thread somewhere on this forum.
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