Elevator Trim Braking Circuit - Revision history

Bferrell: /* Coen Recommendation */

2012-01-11T23:00:59Z

Coen Recommendation

2012-01-11T23:00:48Z

Coen Recommendation

2012-01-11T23:00:17Z

2012-01-11T22:59:58Z

Coen Recommendation

2012-01-11T22:41:28Z

2012-01-11T22:41:17Z

2012-01-11T22:40:51Z

2012-01-11T00:08:12Z

2012-01-11T00:06:31Z

2012-01-11T00:06:16Z

@@ Line 6: / Line 6: @@
-[[File:Dynamic breaking circuit 001.jpg|450px]]<br/>
+[[File:Dynamic breaking circuit 001.jpg|650px]]<br/>
 ''Brett,''
 ''The circuit you are showing is different from the one I posted. Yours works best for those that want to add braking to their existing pitch trim. The circuit I used has some advantages for those starting from scratch.''

@@ Line 6: / Line 6: @@
-[[File:Dynamic breaking circuit 001.jpg]]<br/>
+[[File:Dynamic breaking circuit 001.jpg|450px]]<br/>
 ''Brett,''
 ''The circuit you are showing is different from the one I posted. Yours works best for those that want to add braking to their existing pitch trim. The circuit I used has some advantages for those starting from scratch.''

@@ Line 6: / Line 6: @@
-[[File:Dynamic breaking circuit 001.jpg]]
+[[File:Dynamic breaking circuit 001.jpg]]<br/>
 ''Brett,''
 ''The circuit you are showing is different from the one I posted. Yours works best for those that want to add braking to their existing pitch trim. The circuit I used has some advantages for those starting from scratch.''
@@ Line 45: / Line 45: @@
 IMAGE:V6TrimBrake.jpg
 IMAGE:trimbraking.jpg
 </gallery>

@@ Line 6: / Line 6: @@
 ''Brett,''
 ''The circuit you are showing is different from the one I posted. Yours works best for those that want to add braking to their existing pitch trim. The circuit I used has some advantages for those starting from scratch.''
@@ Line 21: / Line 22: @@
 ''Larry Coen''<br/>
 ''N136LC''
 == Ginsberg Recommendation ==

← Older revision		Revision as of 22:40, 11 January 2012
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		+	_TOC_
		+
		+	== Coen Recommendation ==
		+
		+	Larry Coen offers this solution, and reported benefits:
		+
		+
		+	''Brett,''
		+
		+
		+
		+	''The circuit you are showing is different from the one I posted. Yours works best for those that want to add braking to their existing pitch trim. The circuit I used has some advantages for those starting from scratch.''
		+
		+
		+
		+	''1) The relays switch the motor current instead of the switch in the stick. Improved durability.''
		+
		+	''2) Only 3 wires to the switch instead of 4.''
		+
		+	''3) Current for the relay is much smaller than the motor allowing the use of smaller gage wire.''
		+
		+	''4) No 12v hot wire to the stick.''
		+
		+
		+
		+	''Larry Coen''
		+	''N136LC''
		+
		+
		+
		+
		+	== Ginsberg Recommendation ==
	The tip below is from Bob Ginsberg, courtesy of [http://www.velocityxl.com/downloads.php?do=file&id=77 Velocity Views Volume 6]<br/>		The tip below is from Bob Ginsberg, courtesy of [http://www.velocityxl.com/downloads.php?do=file&id=77 Velocity Views Volume 6]<br/>

← Older revision		Revision as of 00:08, 11 January 2012
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−	The tip below is from Bob Ginsberg, courtesy of Velocity Views Volume 6<br/>	+	The tip below is from Bob Ginsberg, courtesy of [http://www.velocityxl.com/downloads.php?do=file&id=77 Velocity Views Volume 6]<br/>

@@ Line 8: / Line 8: @@
 [[IMAGE:trimbraking.jpg]]<br/>
-The circuit is show below. It taps into the two leads going to the motor from the switch. Each of these leads can be hot or ground, depending on which way you have the switch. The relay is picked up by power from the motor leads, but is grounded separately, making sure it releases when you release the switch.
+The Warner motor supplied with the kit has considerable "coastdown" when you release the switch, making it sometimes difficult to get the trim fine-tuned. I solved this problem, with the help of Bill Betts of Sparkchasers avionics shop, by the use of a dynamic braking circuit. What this circuit does is short the motor windings when you release the trim switch, thereby making the motor its own load. This stops the motor almost instantaneously, but does not change the motor's speed when it is operating.<br/>
 I mounted the relay and the two diodes on the fuselage wall, just behind the pilot side of the instrument panel, with a 4 pin connector and a separate connector for the relay ground. This way, if the relay fails, I can open the connectors and pull the relay and the diodes all at once, facilitating a relay or diode replacement.
 <gallery>

@@ Line 1: / Line 1: @@
-The tip below is from Bob Ginsberg, courtesy of Velocity Views Volume 6
+The tip below is from Bob Ginsberg, courtesy of Velocity Views Volume 6<br/>
 From Bob Ginsberg,
-Fuquay Varina, NC:
+From Bob Ginsberg,<br/>
 '''Pitch Trim Motor Dynamic Brake'''
 [[IMAGE:trimbraking.jpg]]
 The Warner motor supplied with the kit has considerable "coastdown" when you release the switch, making it sometimes difficult to get the trim fine-tuned. I solved this problem, with the help of Bill Betts of Sparkchasers avionics shop, by the use of a dynamic braking circuit. What this circuit does is short the motor windings when you release the trim switch, thereby making the motor its own load. This stops the motor almost instantaneously, but does not change the motor's speed when it is operating
@@ Line 11: / Line 13: @@
 I mounted the relay and the two diodes on the fuselage wall, just behind the pilot side of the instrument panel, with a 4 pin connector and a separate connector for the relay ground. This way, if the relay fails, I can open the connectors and pull the relay and the diodes all at once, facilitating a relay or diode replacement.
 <gallery>