Original Posted By: "joe zw"
Can anyone tell me what the difference is between capacitance and resistancefuel gage senders? Which would be best for a center section tank? Whichfor a fuselage tank?The center section tank is long and shallow, main tank short and deep. Idon't mind using a float and wire on the main tank, but I'm curious aboutthe senders.TIACraig Wilcox________________________________________________________________________________
Pietenpol-List: Fuel Gage senders
Re: Pietenpol-List: Fuel Gage senders
Original Posted By: leonstefanhutks(at)webtv.net (Leon Stefan)
Subject: Re: Pietenpol-List: Fuel Gage sendersIn a message dated 11/7/00 7:40:08 PM Central Standard Time, CraigWilcox(at)peoplepc.com writes:>Craig, the resistance type fuel gage senders, are commonly called 'Direct Current Electrical Indicators. It is the type commonly found in automobiles. These systems consist of a variable resistor as a tank unit (with the float attached to it), or sender, and a current measuring instrument as the indicator. For two tanks, you will need either two gages, or a switch, to toggle between the two tanks, with a single gage.The Capacitance Fuel Quantity Systems, are usually used on larger aircraft, with multiple fuel cells. This type measures the mass of the fuel, rather than just its level in the tank. This is an electronic system that measures the capacitance of the probe, or probes for multiple tanks, which serve as the tank sender units...with no moving parts. One of the big advantages of this type of measuring system is that the probes can be tailored for tanks of all sizes and shapes, and all the probes in the aircraft can be connected to the system integrates their output to show the total amount of fuel on board. The big disadvantage is $$$.I plan on using the trusty ol' stop watch, (or maybe a 1 hour, hour glass !!) for the 10 gal. tank in the wing. However, I am including a length of clear acrylic tubing, 1/2" OD 1/4" ID, where the fuel line is attached to the front left cabane strut. If I'm ever sweating fuel, and I see air dropping down thru that tube, I should have about a minute to turn final, and get on the ground. I just don't want to ever be in that situation, but a few crucial seconds might be all I need. The clear tubing should also allow me to see any water, dirt, or bugs, entering the fuel system. We plan on doing our first engine run this weekend. I can't wait to hear the pucketa, pucketa, pucketa, of that ol' Model A !!Chuck GantzerWichita KSps Any comments on the clear tubing?________________________________________________________________________________
Subject: Re: Pietenpol-List: Fuel Gage sendersIn a message dated 11/7/00 7:40:08 PM Central Standard Time, CraigWilcox(at)peoplepc.com writes:>Craig, the resistance type fuel gage senders, are commonly called 'Direct Current Electrical Indicators. It is the type commonly found in automobiles. These systems consist of a variable resistor as a tank unit (with the float attached to it), or sender, and a current measuring instrument as the indicator. For two tanks, you will need either two gages, or a switch, to toggle between the two tanks, with a single gage.The Capacitance Fuel Quantity Systems, are usually used on larger aircraft, with multiple fuel cells. This type measures the mass of the fuel, rather than just its level in the tank. This is an electronic system that measures the capacitance of the probe, or probes for multiple tanks, which serve as the tank sender units...with no moving parts. One of the big advantages of this type of measuring system is that the probes can be tailored for tanks of all sizes and shapes, and all the probes in the aircraft can be connected to the system integrates their output to show the total amount of fuel on board. The big disadvantage is $$$.I plan on using the trusty ol' stop watch, (or maybe a 1 hour, hour glass !!) for the 10 gal. tank in the wing. However, I am including a length of clear acrylic tubing, 1/2" OD 1/4" ID, where the fuel line is attached to the front left cabane strut. If I'm ever sweating fuel, and I see air dropping down thru that tube, I should have about a minute to turn final, and get on the ground. I just don't want to ever be in that situation, but a few crucial seconds might be all I need. The clear tubing should also allow me to see any water, dirt, or bugs, entering the fuel system. We plan on doing our first engine run this weekend. I can't wait to hear the pucketa, pucketa, pucketa, of that ol' Model A !!Chuck GantzerWichita KSps Any comments on the clear tubing?________________________________________________________________________________