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spark plugs

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bowser22

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hey, making a pulse jet engine and want to improve on it by adding a spark plug that i can control using a circuit to fire when and how often i want it to, this is to prevent engine stalling and to smooth out incomplete combustion. any ideas?
 

bowser22

Member
lmao i dont even know what an input slat is. i can tell you i have alots of dirtbike coils that will handle igntion and i have a nice 12v motorclyce battery i just need a good clean schem for bulding it. im thinkin somehwere along the lines a 555 may be onvolved to change the frequencey at which the plug sparks?
 

bowser22

Member
theres a guy that invented an ecu for these that uses a transducer to listen to the pulses of the jet then change things accordingly, i dont think he published his shcems tho. hmmmmmmmm i am using a valveless design.
 

Boncuk

New Member
Hi bowser,

Pulse jets normally ignite the fuel-air mixture by the red hot cumbustion chamber after initial ignition.

For proper operation a minimum temperature of the cumbustion chamber is required, resulting in minimum thrust.

To throttle the jet below that operating point I suggest to use a glow plug as it is used in reciprocal model engines.

Ignition timing is not critical at all since the jet will only fire if the fuel-air mixture is rich enough, which is proved by the starting procedure: compressed air in, ignition on (which fires sparks at any frequency), fuel line - open.

Don't use a pulse jet with an R/C aircraft model. If uncontrolled it will have a V1 similar effect upon impact on the "target". :)

Boncuk
 
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