Le texte et les photos de Vojtech.

My name is Vojto and I'm living in Zilina city in Slovakia. My
father is building Tornado hovercraft. Unfourtunately we have no
website yet. The Suzuki SV 650 engine is produced 2003 and it was an
occasion to buy it for 400 Eur because it was without ECU and has
something broken in gearbox (it cannot shift to 3rd gear).
I'm building my own ECU because the original unit is very expensive
and we want to hold the budget as small as possible... The first test
was with ignition advance 5 deg. This timing allows quick starting but
it was insufficient by higher RPM. Now is the engine running with
variable timing from 5 deg to 20 deg depending on RPM. The fuel
injection timing is now only fixed once per engine revolution before
and simultaneous with intake stroke. Now I'm prepairing program for
measure and display the data from sensors (throtle valve position and
intake manifold pressure) and RPM. I also need to write some functions
for acceleration because the engine is accelerating very poor with
lean mixture, by rich mixture is it running heavier, smokes, has high
consumtion and spark plugs are getting dirty.... I'm using Atmel AVR
microcontroller MEGA 16 with 9,216 MHz oscillator. Ignition coil
driver is BU931 darlington in recommended circuit (with 360V zener
diodes between collector and base and 100nF capacitor between
collector and emmiter). For programming I'm using Code Vision AVR
where I can write the control program in C-language.
We have bought an 9 blades Hasconwing impeller for propulsion, the
air tunel diameter is 950mm.

I'm attaching some pictures:

-an RPM, temperature and fuel level indicator

-hovercraft hull

-engine with exhaust and silencer

-crankshaft position sensor output on Suzuki SV 650 (the signal gap is
front cylinder's bottom dead center)
If you are interested in more information please ask.

regards