<snip
 I also did away with one tooth to better simulate
 what will happen in the final flyaway configuration.
 There will be only one trigger tooth and four mag pickups.
 Two for ignition (about 22 degrees BTDC) and two for fuel
 injection (about 90 degrees BTDC). The angular position of
 the pickup relative to top dead center will adjust the
 timing of both 555 fuel injection and ignition.

 Paul Lamar

Paul -

You crack me up.  Just months ago when I brought up this scenario for
triggering injectors and ignition, you complained that it had too many
sensors, and that sensors weren't cheap.  :)  At the time I brought it up
more as an illustration of the rotary's simple timing arrangement than as a
design proposal.

But hey, I'm glad its value as a simple, no-moving-parts system has become
apparent.

I guess I ultimately agree that it DOES have too many sensors, too much
shielded wiring, and too many critical clearances to set.  A timing wheel
with a simple counter & multi-trigger circuit would be more pragmatic, I
think.

Just my thoughts.

-Vince Orton

Some times it takes a long time for a good idea to sink into my brain :)
There is some redundancy here. If one sensor fails it will only affect one
rotor.

These sensors are expensive. Klaus tells me he took one apart and it had a
zillion turns of very fine wire. He uses tiny rotating magnets and hall
effect sensors instead because they are cheaper. Trouble with that is Hall
effect sensors need voltage to work.

I am looking for a cheap source for these magnetic sensors and I may attempt
building my own. They appear easy to make. Materials are cheap.
You need some magnet wire:

http://webtronics.stores.yahoo.net/32mawi1lbspm.html

A round cylindrical bar magnet:

http://www.kjmagnetics.com/categories.asp?gclid=CJXmz-DonZgCFRwDagoddmh2Aw


And a housing made from steel threaded pipe used in lamps:

http://www.nationalartcraft.com/subcategory.asp?gid=1&cid=24&scid=437

Here are the dwgs and some files.

Paul Lamar


Paul, you might search Ebay for "coil winding machine" there are some
fairly inexpensive machines out there.
Or If you think this will be an ongoing need for our rotary projects, and
you haven't the time, I'll take on the coil project invest in a winder and
some raw materials and start production.
What do you think?
C. Smith


That is a good idea. The need for these things is not going away.
It will take some experiment to come up with a 300 volt coil.
Revmaster did it so it must be possible.

BTW one or more of these things looking at the ring gear would make
a good low cost back up alternator. The magnets do not have to rotate.
They can be built into the coil. All you need are changes in the
magnetic field and the ring gear starter teeth will provide that.

Paul Lamar