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chaosMurphy's blog
Archive for October, 2007
Posted by chaosMurphy | Oct 12, 2007 @ 05:17 AM | 4,899 Views
“”Is it possible to run two motors at the same time at different speeds, or with one motor on and one motor off?”” Bob

http://www.rcgroups.com/forums/showthread.php?t=755466

>YES< can be done.

Two motors, two ESCs, different speed (delta yaw) or
one motor off, the other full on or in-between (adverse yaw, 4D and beyond ).

The good news, this can be accomplished with the ole BCR (Before Computer Radio).
The computer radios MIX / STICK potential add more functionality.

Connect ESC-1/motor-1 to THR CH3 (normal)
Connect ESC-2/motor-2 to RUD CH4 and cut ESC-2 red wire

AT THIS POINT, ‘normal’ rudder servo function is lost.
The GOOD NEWS lighten the model, remove rudder servo and cross couple rudder to aileron like we did back in the ole-days BCR.

AT THIS POINT, the old rudder stick, now NEW THR STICK is spring loaded at half throttle.
I suggest, disable spring / Phillips screwdriver / long nose pliers.

For the more adventurous than me … ...
Do not disable spring, SUB TRIM motor synchronization with ‘trim’ lever.

Computer radios MIX, STICK, EXPONENTIAL and SUBTRM only add sketty-eight more options.
Posted by chaosMurphy | Oct 02, 2007 @ 10:25 AM | 4,957 Views
Control Surface Differential

Control surface attuned...
Computer radios make this a cinch.

Life is a little more complex for some of us with BC radios (before computer).

Never could find my trig-table let alone remember how to use it. An analog computer is much less complex, no math mistakes to deal with, more fun to build and play with than a book of tables.

Pic-1
Top, the perfect set up, output is equal to input
Middle, several options
Bottom, mine usually lQQk like this

Pic-2
Scrap foam, stickpins for pivots and protractor required to build analog computer
I suggest keep linear measuring units the same (such as inches red tic marks), wheels seperated 10 inches

Pic-3
Pointer on right is output >and< side view of control surface
Output Equals Input

-4 es –5 output result for an initial input set to 45