Mounted the Booster Magneto
Continuing on with the rear stick pushrod, I cut out some .090 sheet steel into a 15/16 in. strip and bent it 90 degrees.
Checking to make sure the bend is square.
The second bend is a bit more tricky. The bracket is designed to move left and right as well as front to back so it has to be wide enough to slip over the universal fitting on the back of the stick. I cut a block of aluminum to the right thickness and made the second bend.
The ends were cut off with the bandsaw, ground with the grinding wheel and smoothed with a file.
Here is the bracket at the end of the tube. It will be welded in place later. You can also see the universal bracket from the back of the stick on the left.
On to the next item.
The Hisso is going to have a Booster Magneto for starting. Since our Magneto is pretty old and we're not sure of it's condition, we decided it needed to be overhauled. Not sure where we will send it yet, but the fact of the matter is that the Mag will be leaving for a few weeks and I don't want that to hold up our progress. So, I decided to build the mounting hardware.
An 1 in. by 3/4 in. piece of spruce was cut to length and the edges beveled 1/8 in. on the spindle sander.
The spruce piece is the top support. The bottom support is a piece of .060 steel bolted to the Mag and the lower crossmember.
Then the brackets for the top and bottom of the spruce piece were fabricated. Some more sheet steel was cut, bent, ground and filed to shape.
Brian drilled the holes.
You can see the little bracket below the fuel shutoff rod. There is a bracket on the top and bottom on either side of the new crossmember secured with brass wood screws.
One of the next steps is to mount the wobble pump. Let me explain:
The carburetor of the Hisso is on the top of the engine which eliminates any chance of fuel gravity feeding from the fuel tank to the engine. Back in the 1920's they just pressurized the fuel tank with either an air driven air pump or an engine driven air pump. Pressurized fuel flowed up hill and everybody was happy...unless that tank ruptured...or the pump quit.
So, we decided the best way was to mount a Pesco pump on the back of the Hisso. That way we had a fuel pump driven by the engine. If that failed for some reason, our back up source of fuel pressure was a wobble pump. Hey, you might have to pump a while, but the engine will still run.
Looking at the options available, we wanted an old wobble pump to fit the style of the aeroplane. The D-11 wobble pump we found didn't work too well and we could not find anyone who knew how to overhaul it Our other option was a modern Buzz pump which could be bought at the local Aircraft Spruce and Specialty store right here in Peachtree City.
Considering the value of the aeroplane, I'd hate to end up in a farmers field just because I wanted the look of a vintage pump. We went for reliability and bought the Buzz pump. Purists forgive me. I know they didn't have the Buzz pump back in 1920. I'm going for safety on this one.
More at the end of the week.