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larkrv10(at)gmail.com
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 Posted: Sat Nov 03, 2012 5:52 pm Post subject: aileron trim |
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Bill, funny you would mention the circuit thing, as I too had a primary flight instructor 35 years ago show and teach me the exact same thing. No hands on the column, feet on the rudder peddles and using elevator trim/power to descend etc. To this day I use rudder and elevator trim all the time when flying my C-177B.
Having said that, there is something to be said about the KISS principle. None the less I've installed trim for all 3 axis.
Can't wait to use the electric trim in the -10.
Rick
#40956
Southampton, Ont
On Sat, Nov 3, 2012 at 2:36 PM, Bill Watson <Mauledriver(at)nc.rr.com (Mauledriver(at)nc.rr.com)> wrote:
[quote] Funny you should mention the complete circuit using trim. Years ago when trying to learn to land a C150 at age 16, the instructor flew the pattern with trim-only. Pitch trim that is, and rudder and power of course. It showed me how unnnecessary my death grip on the yoke was.
Anyway, does that mean that the MD-11 A/P didn't operate the trim when engaged? Or was it just a good habit that shouldn't be broken?
Bill "still thinks his TruTrak AP is a magical gift from the gods" Watson
On 11/3/2012 2:10 PM, James Dearborn wrote:
| Quote: | All good points. I'm one of those who believes in trim, trim, trim. Trimmed hands off is the most efficient your airplane will fly. It is also the 'state' your airplane should be in when the auto pilot is engaged. Even flying the MD-11 I trimmed to hands off before engaging the A/P and would occasionally click off the A/P enroute just to insure the control pressures were neutral. Finally, trim can be a backup flight control system. Years ago I instructed in T-34Bs (1,000+ hrs). One demo I gave was a complete circuit in the landing pattern using only trim. Trim is your friend!
Cheers,
Jim
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Mauledriver(at)nc.rr.com
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| Posted: Mon Nov 05, 2012 3:40 pm Post subject: aileron trim |
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It was a break through moment for my training at the time (1970). I tried to do it with my Maule but could never quite pull it off. Way too much coupling of engine power and pitch (my description).
I have 2 axis trim. You'll love the electric pitch trim - definitely have a hat button on your stick. You'll barely if ever use the aileron trim but it's a good way to set a neutral point for your flying. I half installed a spring based rudder trim system anticipating the need for it. It will never go in. In cruise I find the rudder system just sticky enough to hold enough right rudder to center the ball. Plus I've never been comfortable with both feet on the floor all the time - too much Maule time I guess. I generally cruise with my right toe on the pedal.
I included TCW's Safety Trim 2 axis controller. It is designed to prevent overruns and to provide a means of recovery from such an overrun. The feature that is on all the time limits trim operation to 3 seconds at a time. I find that very handy for calibrating the amount of trim I want to apply. For example, before takeoff, (2) 3 second runs of down trim give me an acceptable trim position for a home field takeoff with flaps. I have position indicators setup on my GRTs but they are not consistently accurate so the 3 second runs are very handy for gross trim adjustments. Plus with hat switches on both sticks, an errant hand, arm, foot can't put the aircraft out of control.
And you'll definitely want your AP (assuming you are putting one in) to control your pitch trim. The TruTrak operation of the elevator trim is seamless and accurate.
But of course, we all like what we installed in the plane and don't need the features we didn't install....
Bill Watson
On 11/3/2012 9:52 PM, Rick Lark wrote:
| Quote: | Bill, funny you would mention the circuit thing, as I too had a primary flight instructor 35 years ago show and teach me the exact same thing. No hands on the column, feet on the rudder peddles and using elevator trim/power to descend etc. To this day I use rudder and elevator trim all the time when flying my C-177B.
Having said that, there is something to be said about the KISS principle. None the less I've installed trim for all 3 axis.
Can't wait to use the electric trim in the -10.
Rick
#40956
Southampton, Ont
On Sat, Nov 3, 2012 at 2:36 PM, Bill Watson <Mauledriver(at)nc.rr.com (Mauledriver(at)nc.rr.com)> wrote:
| Quote: | Funny you should mention the complete circuit using trim. Years ago when trying to learn to land a C150 at age 16, the instructor flew the pattern with trim-only. Pitch trim that is, and rudder and power of course. It showed me how unnnecessary my death grip on the yoke was.
Anyway, does that mean that the MD-11 A/P didn't operate the trim when engaged? Or was it just a good habit that shouldn't be broken?
Bill "still thinks his TruTrak AP is a magical gift from the gods" Watson
: 11/05/12
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