Thanks Bob,

And that’s a great idea for the dip stick.  As I recall the overflow vent was called for in the plans and I have that feature.

John

John Barrett wrote:

Anyone know the capacity of the reservoir?  I measured the box roughly and got 6”X6”X6.5”.  Don’t know the displacement of the internal parts that go inside the tank.

An even more important question is how full to fill the tank?  All the way or some measurement below the top?

John,

I’d recommend you leave at least an inch of airspace at the top of the reservoir; 2” is better. This allows for thermal expansion and to accommodate any air that might get into the system. It’s also important that the tank be vented as shown in the building diagrams…for the same reason. The volume in the reservoir doesn’t change appreciably during operation of the gear and flaps. Also note that the tank has a pickup for the emergency extension hand pump that is lower than the normal pump pickup. This allows the emergency pump to draw oil for gear extension after the electric pump has pumped all it can overboard in the event of a leak.

I made a very simple “dip stick” for the reservoir by drilling the fill plug from the inside for a length of 1/8” aluminum pipe, and bonding the tubing in the plug with JB Weld. Then mark the dip stick for the max and min levels you’d like. Do this easily by crimping the tube gently to mark it with a pair of side cutters.

Works well…

Bob