Looking at the following video got me curious how much side slope others on here are comfortable with for off airport operations and why?

http://www.youtube.com/watch?v=903ndLI0nLY

depends on the wind direction. don't do it if wind is coming from the top wing side.

There maybe slight mitigation if cresent shaped beach? Never tried, just $0.02 comment.

I don't like side loading the gear more than about a 20 deg beach. As far as wind... it depends on the wind speed as to whether or not the wind on the uphill wing is bad. I do lots of beach landings every year and (knock on wood) no issues in the last 20+ yrs.

The 8GCBC can crossfeed fuel to the point of be coming very unstable on a lateral slope, being my experience with the 70 gal tanks. I believe it crossfeeds through the crossover vent, but I need to call the factory to see if there are check values and/or to understand why. I always shut the fuel off if she is lateral tilted during parking or moored. Crossfeeding could sink a seaplane from what I am told.

8GCBC wrote:The 8GCBC can crossfeed fuel to the point of be coming very unstable on a lateral slope, being my experience with the 70 gal tanks. I believe it crossfeeds through the crossover vent, but I need to call the factory to see if there are check values and/or to understand why. I always shut the fuel off if she is lateral tilted during parking or moored. Crossfeeding could sink a seaplane from what I am told.

Will it not cross feed with the fuel selector off? I am pretty sure my 7GCBC will. The fuel shut off is down by your left leg, but the crossover line runs across up top, above the selector. Not 100% sure on this, as I hardly ever turn my fuel off.

A1Skinner wrote:

8GCBC wrote:The 8GCBC can crossfeed fuel to the point of be coming very unstable on a lateral slope, being my experience with the 70 gal tanks. I believe it crossfeeds through the crossover vent, but I need to call the factory to see if there are check values and/or to understand why. I always shut the fuel off if she is lateral tilted during parking or moored. Crossfeeding could sink a seaplane from what I am told.

Will it not cross feed with the fuel selector off? I am pretty sure my 7GCBC will. The fuel shut off is down by your left leg, but the crossover line runs across up top, above the selector. Not 100% sure on this, as I hardly ever turn my fuel off.

Had the valve shut off ( red handle, lower left, inside cockpit, up position ) on a lateral tilt and the fuel very slowly went through the cross feed (?), I think. I could been mistaken but, the fuel then started to come out thru the left wing external vent, dripping rapidly, I know there is a check value but, the fuel still dripped out. Also, the left tank(s) were completly full, right tank(s) about half. I never knew what happened from a analytical standpoint, but very cautious of lateral tilt now, until questions are answered.

Maybe the fuel shutoff was not up ( off position )? Maybe it was a mistake on my part?

Majority of check valves in fuel vent systems have a very small hole to allow pressure to equalise, not large enough to cross feed significant quantities though, but the valves can leak when the get full of crud.. Usually goes through the selector valve

onefitty wrote:Majority of check valves in fuel vent systems have a very small hole to allow pressure to equalise, not large enough to cross feed significant quantities though, but the valves can leak when the get full of crud.. Usually goes through the selector valve

Rgr that. Thx!

I don't think it was a mistake. I'm pretty sure the crossfeed is above the fuel shut off, so it will crossfeed even with the fuel shut off. I know my 7GCBC crossfeeds at almost any angle. And if its too much of an angle it will start dripping out of the vent. But with 36 gallons it doesn't affect it as bad as 70. Still don't like flying with one full and one empty, me thinks that would be a bad idea.
David

A1Skinner wrote:I don't think it was a mistake. I'm pretty sure the crossfeed is above the fuel shut off, so it will crossfeed even with the fuel shut off. I know my 7GCBC crossfeeds at almost any angle. And if its too much of an angle it will start dripping out of the vent. But with 36 gallons it doesn't affect it as bad as 70. Still don't like flying with one full and one empty, me thinks that would be a bad idea.
David

Pretty sure I turned fuel off. It probably was the cross vent thru the front cockpit, which transferred the fuel.

8GCBC wrote:
Pretty sure I turned fuel off. It probably was the cross vent thru the front cockpit, which transferred the fuel.

I am pretty sure we are saying the same thing. The fuel WILL transfer, even if the fuel selector is off.

Thank you for the concurrence and info.

8GCBC, I just reviewed the fuel system schematic for my 1975 8GCBC project. The fuel shut of valve is nothing more than a shut off valve located between the forward fuel manifold and the fuel strainer. The left and right fuel tanks are interconnected at both the rear and forward manifolds, and the rear manifold is connected by a fuel line to the forward manifold. Shutting off the fuel shut off valve does not shut off the connection between the left and right tank through the rear or forward manifold, allowing fuel to transfer from one wing tank to the other. I do not have access to a late model 8GCBC manual but your fuel system may be and probably is the same. Cessnas with the left, both, right, off fuel selectors are like that also. Off leaves the tanks interconnected through the selector but off to the fuel strainer. To stop fuel from transferring on a Cessna you have to select left or right. Hope this helps.

Tim

Hi Tim,

I believe we have the same fuel systems, will check with Dale the engineer at ACA. Thank you Tim for info. Will be careful with lateral parking tilt, regardless.

On a Maule you have to select right or left or they will cross feed.

if your just landing the slope or beach and doing touch and goes, the fuel does not have time to cross feed and cause issues (you don't loose gas just because you do a few 60 degree turns in the air do you?). If you are parking there for awhile, then yes, you can get fuel running out the downhill wing. I never PARK with a wing low unless I have the selector off so they wont cross feed. I learned that one early on when I took the PA12 out to an island for a weekend camping trip... I was about 14 gallons shy of what I really wanted to have on board when I figured out what was going on.