----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
Well, John now you are not talking about a single closed loop as per
Ercoupe family elev and rudder. You are talking about a complex system
using
levers. That is ratio. Using the fulcrum. This goes back to being kids. We
all learned about fulcrum then in the play grounds.
Now if you want to lose another bet name the stakes. I am game. Who is
hanging two 175 lbs weight on the cable? Did I miss something?>> Your
confusing hanging weights (dead weight) and tension.<< Tension is pulling
along the cable. Not 90 * to from it.
Use two tensiometers one top, one bottom tighten either cable. They
will
go up together.
Warren
PS; The fan belt in your car is set by tension to keep it from
slipping.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Wednesday, March 14, 2001 5:55 PM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: Re: [COUPERS-TECH] Elevator Cable Tension
Warren, et al:
I must admit I find this quite confusing. So, some of this may in fact be
wrong.
I was not the one that brought up the 350# thing, but it seens to me that
if
each cable of a bell crank had a 175# weight hanging from it, then the
tension on the bellcrank pivot bearing would be 350#, which I think is
what
the other guy was saying.
As far as the unequal length arms go, A Cessna 140 has unequal length bell
crank arms on the aileron bell cranks. The shorter arms (If I recall
correctly) are connected togther by the carrythrough cable. The longer
arms
are connected to individual cables that go to the yokes. If you set the
yoke cables up with 30# (Cessna says "about 30 lbs") and then measure the
tension on the carrythrough cable, it is higher due to the leverage
advantage
from the shorter arms. I know this is true because I lost a bet on it...
John
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