Hi Paul

I've just come across a reference on another list that states that Klaus
told the author that his EFI is a programmable software based system and
sighted concerns about re-booting or hanging up in flight as why he does not
want to sell it commercially as he could not offer it in a "hard silicone
version".

555 PWM constant flow or
555 regular injectors and return, has promise of simple and cheap if doable.


Clive

The way I heard it from Klaus (across the taxi way) is he did not like
computers for the reason he stated above and he is using a 555 system
instead. Try asking Paul Lipps as he designed the system for Klause. Re
booting is no big deal but when was the last time your computer crashed? Not

counting crashes caused by Windows of course:)

Paul Lamar


Paul

I posted an abbreviated version because awhile back you had said Klaus had
555, and this was opposed to your belief.

Point taken about, non-Windows crashing/rebooting.


My vote is a 555 system.

Programming a programmable system to the engine is what I think is the
problem with programmable systems.

555 would be like the old Bosch constant flow. The one with the cone shaped
airflow device would work on just about any engine if the unit was the right
size, no programming. A bit too heavy for aircraft really.


Clive


Hi Paul

I e-mail Paul Lipps as you suggested.

He confirmed that the Klaus system is NOT PROGRAMABLE, and it is NOT 555
based.

I have since come cross a reference, from the man himself dating back to
2006, which clearly states:-

Two drivers
Two pressure controlled return less fuel pumps
In addition to that above
Hand props (Lycoming)

It has been in Delaminator at the time of the post 3 years so now 6 years.

So at least we have the answer without any speculation.

Clive


It is easy to say that ROFL. He could be using the 556 which is a dual version of the 555 :)  Two 555's in a larger package. I have met Paul and talked to him a bit so I would not put this little joke past him :)

The bottom line is whatever chip or circuit he is using must do the same thing a 555 does and that is convert a sensor output to a pulse width for the injectors or control the fuel pump. One could control the fuel pump with an amplifier but that would be an extremely inefficient to say the least so I assume he is using PWM on the fuel pump as well which everybody else in the world would do :)

http://www.kpsec.freeuk.com/555timer.htm

Paul Lamar