MMSIPH-10 MK 1 UPDATE: Nearly pierced 1/2" Steel!!
Posted: Wed Sep 23, 2009 7:35 am
MMSIPH-10 MK 1(Manometrically Metered Pilot Isolated Piston Hybrid )
Chamber: 2" SCH 40 galvanized, 12" long, plus a lot of fittings.
Barrels: .5" copper 10' long, in 5' segments. 2" EMT conduit 10' long, also in 5' segments
Valve: .75", .5" porting, O-ringed piston. O-Rings allow pilot to be filled to a different pressure than the chamber, allowing opening pressure to be adjusted Independently from mix #.The dead space is filled with caulk, so the air spring has an acceptable compression ratio.
Piston: Machined aluminum, 2 O-Rings. Re-enforced rubber sealing face
Mix: 2x-10x (limited by compressor)
Ignition: Camera flash/ Iggy coil. The trigger electrodes can be hooked up to any extension cord, allowing me to be 250 feet away when I fire the cannon. The most I ever use is 50 feet.
Spark plug: Drilled out bushing/ filed down automotive spark plug JB-Welded together.
Meter: modular quick connect, manometric.
fuel meter:
air meter:
nozzle: homemade venturi designed to aid in fuel mixing, as I was having problems with this earlier. IIRC, the holes are .02" diameter
nozzle before insertion into tee
Noise level: Surprisingly quiet when a paper towel wad is used with 10' barrel. Multiple echoes around my rural neighborhood when shooting blanks. Absolutely deafening in my basement at 2x with no barrel.
Damage (most filmed at 1200fps):
AA vs. milk jugs of water (hgdt says 1000fps)
[youtube][/youtube]
AA vs. steel plate (1000fps)
[youtube][/youtube]
hardened steel nail vs. steel plate (1500fps)
[youtube][/youtube]
picture of nail:
golf ball ricochet off steel plate (283fps based on video)
[youtube][/youtube]
Future upgrades:
-bolt action system for 1/2" copper barrel
-2" piston valve, magnesium alloy for 40% less weight, if I can find some rod for less than $80 shipped. I may melt scrap, but melting several pounds of flammable metal that will evolve hydrogen and steam if it contacts water seems rather unsafe. I also lack a suitable inert gas cylinder.
-Barrel supports!!!
Innovative design:
Ignition system that uses extension cords to extend range, without buying extra wire. (currently too ghetto to include pictures of)
Pilot area sealed from chamber to allow opening pressure to be controlled separately from mix number
Nozzles to aid in fuel mixing (see above)
Other notes: flies seem to love the galvanized chamber
Chamber: 2" SCH 40 galvanized, 12" long, plus a lot of fittings.
Barrels: .5" copper 10' long, in 5' segments. 2" EMT conduit 10' long, also in 5' segments
Valve: .75", .5" porting, O-ringed piston. O-Rings allow pilot to be filled to a different pressure than the chamber, allowing opening pressure to be adjusted Independently from mix #.The dead space is filled with caulk, so the air spring has an acceptable compression ratio.
Piston: Machined aluminum, 2 O-Rings. Re-enforced rubber sealing face
Mix: 2x-10x (limited by compressor)
Ignition: Camera flash/ Iggy coil. The trigger electrodes can be hooked up to any extension cord, allowing me to be 250 feet away when I fire the cannon. The most I ever use is 50 feet.
Spark plug: Drilled out bushing/ filed down automotive spark plug JB-Welded together.
Meter: modular quick connect, manometric.
fuel meter:
air meter:
nozzle: homemade venturi designed to aid in fuel mixing, as I was having problems with this earlier. IIRC, the holes are .02" diameter
nozzle before insertion into tee
Noise level: Surprisingly quiet when a paper towel wad is used with 10' barrel. Multiple echoes around my rural neighborhood when shooting blanks. Absolutely deafening in my basement at 2x with no barrel.
Damage (most filmed at 1200fps):
AA vs. milk jugs of water (hgdt says 1000fps)
[youtube][/youtube]
AA vs. steel plate (1000fps)
[youtube][/youtube]
hardened steel nail vs. steel plate (1500fps)
[youtube][/youtube]
picture of nail:
golf ball ricochet off steel plate (283fps based on video)
[youtube][/youtube]
Future upgrades:
-bolt action system for 1/2" copper barrel
-2" piston valve, magnesium alloy for 40% less weight, if I can find some rod for less than $80 shipped. I may melt scrap, but melting several pounds of flammable metal that will evolve hydrogen and steam if it contacts water seems rather unsafe. I also lack a suitable inert gas cylinder.
-Barrel supports!!!
Innovative design:
Ignition system that uses extension cords to extend range, without buying extra wire. (currently too ghetto to include pictures of)
Pilot area sealed from chamber to allow opening pressure to be controlled separately from mix number
Nozzles to aid in fuel mixing (see above)
Other notes: flies seem to love the galvanized chamber