A wager that you can jam a 5 1/2 tank on your Cardinal? (On the outboard side mind you)
I don't have time tonight to take pictures showing you the 5 1/2 in long tank in the space but will tomorrow evening!
The picture below has a 5 oz Snub Snub Nose RSM uniflo tank in place on it. This tank is 3 1/2 inches long and you can see that there is a lot of clearance between the engine an the wing. I measured the distance between the back of the exhaust flange on the engine and the root of the wing where it joins the fuselage and it is exactly 5 3/4 inches which leaves an 1/8 inch clearance between both the flange and the wing, with a 5 1/2 oz standard uniflo tank (5 1/2 in long) with the vents modified to exit the top of the tank (common practice and easy to do)! Actually it could even be made to work by bending the fuel feed line down to clear the engine since the cylinder is another 1/4 inch from the exhaust flange on the LA46 engine! The better practice however would be to use the 5 1/2 oz snub Nose tank from Eric or reroute the fuel feed line to the top of the tank if you wish to use the long tank! You would of course also have to use tank mounts on the top and bottom of the tank instead of the ends with the long tank.
There's always another way to skin a cat! That's what CL Stunt is all about!
Another thing to consider that I actually hadn't is that depending on where you fly a 5 oz tank might be more than adequate. It often is not here in Tucson because the common practice here due to the heat and altitude is to use 15 to 20 % nitro and that often demands about 5 1/4 oz of fuel to fly the pattern in the summer months when the temps exceed 100 degrees and the nitro demands can exceed 20% to maintain power!
I will tell you that I have reworked and used many LA46 engines and sold approximately 65 of them to various folks everywhere. The mods I make are not drastic but slight port angle changes can and do make the engines typically more fuel efficient with a flatter torque curve by simply directing the incoming charge into the cylinder away from the exhaust port. I taught these changes to a number of people who also modified engines for other folks to the extent that there are likely more than a hundred and fifty or more of these modified engines running around.
They typically use about 4 1/2 to 4 3/4 oz. to fly the pattern.
Here's that nasty old picture again of my Cardinal Profile and look carefully at the tank and consider that it's 3 1/2 inches long and 1 /1/2 inches high!
Randy Cuberly