*********************** 8880 chassis with pneumatic engine ***********************

the photos in this gallery are the evolution of the vehicle.

This project started originally as an idea. I started building pneumatic engines
as an unnoficial competition against Alex Zorko, ( http://www.nicjasno.com ) to
prove that it was possible to build a vehicle which was entirely driven by a 
pneumatic engine, and not be seriously oversized like some of his creations.
as my engine is relitively simple in design it allowed it to reach a faster speed
than zorko's v12 hemi (i compared the reading from my rcx based speedometer to the
one that was oficially released by Lego. more info on this subject later on).


The RCX controlled steering system for this is based upon an earlier but rather
un-orthodox design. Most RCX controlled steering systems use a simple touch sensor
to indicate when the steering is centred. In my system i prefer to use a rotation
sensor as it allows for accurate multi point steering.



the drive chain consists of:
	Engine: 2 stroke - 4 cylinder - double acting (piston is pushed both ways)
		based upon the vavle system of Dr. C. S. Soh. 

	Clutch: Basic dog clutch aka half of the gearbox from the 8880.
	
	Differential:	New Type (standard 8880).... the old ones from the airtech rig
			were kinda feeble ;)

	Drive System:	2 Wheel, rear wheel drive.



****** updated 18/4/05  ******
Engine ports have been reborred, so rather than teh standard 1mm theyre now 1.5...
increased rpm noticably.




The lego RPM counter Vs. RCX Rotation sensor.
	From my experimentation. i have concluded that the standard rpm counter is
	innaccurate. i have found that it will show 240rpm when it is actually only
	doing 217, and will show 220 between 211-216.

	the rpm count using the rcx is this.
	((number of clicks made in 1 second by rotation sensor) / 16) * 60

	if you would like to see a video of my engine in action please dont hesitate
	to e-mail me.

	At this point you should look at the rpm counter on Zorko's engine video.





Disclaimer:
Usual crap... i aint affiliated with The Lego Group etc. etc.