Ken Powell wrote:

I would just like to remind everyone of the failure mode that Jeff
Spitzer (and others) mentioned recently.  When you are running 2 belts
side by side and 1 breaks, there is a good chance that the broken belt
will get between the good belt and the pulley and break the good belt
also.  Jeff mentioned that he will be building a shield between the
belts to prevent this.  Thanks to everyone who has mentioned this for
the reminder.

I am building a Day VFR only RV-4 and I plan to tap manifold vacuum to
run at least an attitude indicator.  I realize that the throttle will
have to be partially closed to generate a vacuum (cannot run WOT) but
this is an acceptable tradeoff for me.  If I really need an Attitude
Indicator then I already have big problems in a day VFR only bird so
slowing down should not be a problem.  I would guess that I will need
both a vacuum regulator and a vacuum accumulator (to smooth the intake
pulses) to make this work.  However, I am still years away from having
the plane to this point of construction.

Thanks,
Ken Powell

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