>> system would work for leaning manually. Lectron was the first to my
    >> knowledge to SUCCESSFULLY produce a complete single needle system
    > carb
    >> that actually worked.
    >
    > Isn't a Zenith/Stromberg CD or SU's single needle? My Lotus
   Europa runs
    > fine on 175CD's since 1974 with a bit of needle
    > and damper oil tweaking;-)
    > -K

    > NO. The Constant velocity carb is a different animal. They use the
    > piston
    > and vacuum chamber to handle all kinds of midrange duties, but
   the top
    > end is controlled by the main jet. Many types use pilot and main
   jets.
    > The
    > Lectron is a single needle controlling from idle to WOT. The Lectron
    > isn't
    > a CV type, it is a slide throttle carb.

   Bill, thanks for the info;-)
   Can someone if they have these take a few pic of the metering rod
   setup in
   this carb.

   I was wondering if they were density and altitude compensating. Here
   is a
   good write-up. But I wonder how wide a range the carb has.
   http://www.fastbygast.com/Catagories/products/Description/How%20it%20works.asp
   <http://www.fastbygast.com/Catagories/products/Description/How%20it%20works.asp>

   Sort of pic's of the metering rod.
   http://www.fastbygast.com/Catagories/products/Description/initial_metering_rod_setting.asp
   <http://www.fastbygast.com/Catagories/products/Description/initial_metering_rod_setting.asp>
   http://kawtriple.com/mraxl/carb/lectron/lectron_tuning.htm

   Interesting read.
   http://www.on-dunes.com/forums/printthread.cfm?Forum=99&Topic=1210
   <http://www.on-dunes.com/forums/printthread.cfm?Forum=99&Topic=1210>

   -k




I don't think altitude/density compensating is interesting at all
(IMHO)..  The rotary (maybe more than other aircraft engines) needs
adjustable mixture - in a gross sense.  I envision running 80deg ROP
(rich of peak EGT) for takeoff and initial climb, 100+deg LOP (lean of
peak EGT) when cruising at low altitude, and at peak EGT when above 8000
(all naturally aspirated).  The mixture control is a key part of getting
good BSFC and controlling power output.  We can leave compensating for
altitude as a part of a FADEC system.


Regards,

Matt-

Yes I am glad you brought this subject up. Altitude compensation by itself is near useless.