Smilin' Jack
Well Known Member
I completed the installation of Marvin Homsley smoke system on my RV7 Saturday.
I had the desire to make the tank removable and thus took a little different approach in case I needed more baggage space.
The empty tank pump and valve and hoses weigh 10 lbs and since they are in different areas of the aircraft the weight behind the seats come to 8 lbs.
The Valve, weighs in at a pound, to control the oil flow was mounted next to the pilots hip where it could be reached in flight.
Starting with the tank I scribed the legs to the floor and clamped the tank to be in alignment with the flap enclosure. I used some 3/4 X3/4 angle left over from the build and made them 2 inches long and popped riveted them to the floor once I had the legs positioned. I attached the tank using AN 3-4 hardware with castle nuts and safety pins on the floor of the aircraft, the upper portion of the tank that goes between the cross member on tip ups I used 3/4 inch spacers and then used AN 3-12 bolts and castle nuts and safety pins.
On the pump I mounted behind the pilot seat using rivnuts and used an awl to locate the holes in the carpet to put the screws through
I used a unibit and made two angle brackets and riveted them to a piece of .025 aluminum. Using the unibit I made the holes in the angles really snug to fit over the input and output of the Valve. Like I stated before this left me able to position the valve near my hip so I could reach it.
I installed the T fitting after making two washers for the fitting to pass thru the fire wall. And ran the lines to the number 3 and 4 exhaust pipes since I have a 4 pipe system about 1 1/2 inch below the EGT probe and about 4 inches below the cylinder.
We learned that only a quarter turn produced adequate smoke from the system
Jack
I had the desire to make the tank removable and thus took a little different approach in case I needed more baggage space.
The empty tank pump and valve and hoses weigh 10 lbs and since they are in different areas of the aircraft the weight behind the seats come to 8 lbs.
The Valve, weighs in at a pound, to control the oil flow was mounted next to the pilots hip where it could be reached in flight.
Starting with the tank I scribed the legs to the floor and clamped the tank to be in alignment with the flap enclosure. I used some 3/4 X3/4 angle left over from the build and made them 2 inches long and popped riveted them to the floor once I had the legs positioned. I attached the tank using AN 3-4 hardware with castle nuts and safety pins on the floor of the aircraft, the upper portion of the tank that goes between the cross member on tip ups I used 3/4 inch spacers and then used AN 3-12 bolts and castle nuts and safety pins.
On the pump I mounted behind the pilot seat using rivnuts and used an awl to locate the holes in the carpet to put the screws through
I used a unibit and made two angle brackets and riveted them to a piece of .025 aluminum. Using the unibit I made the holes in the angles really snug to fit over the input and output of the Valve. Like I stated before this left me able to position the valve near my hip so I could reach it.
I installed the T fitting after making two washers for the fitting to pass thru the fire wall. And ran the lines to the number 3 and 4 exhaust pipes since I have a 4 pipe system about 1 1/2 inch below the EGT probe and about 4 inches below the cylinder.
We learned that only a quarter turn produced adequate smoke from the system
Jack
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