lear 45 trim setting

[snorkboggler]

Hello guys and gals,

Been on the lear 45 for about 6 months so getting used to it now.
We tend to use about six digits on the trim setting for a mid weight and say 6.8 for a heavy take off. Problem is on our trim sheet for a MTOW it ends up being around 5.4 I set this once and the plane liked the runway a little more than I wanted it too.

What does evryone else use. I know AFM is king but practically ....

thanks for any tips

snorkboggler

[Oluf]

Hi

The trimsetting is there for the event of enginefailure after V1, it will provide you with the closest trimsetting to v2 climb with one engine out.
That said, in my experience I rather like having to lift the nose for takeoff, rather than the stick forcing itself nose high, but then again that's a matter of prefferance i guess.
I generally suggest to keep positive forward pressure until rotation is desired, I feel it gives more positive control of the aircraft.

My thoughts anyway

O:8

[A Pandy]

Agree with Oluf, tend to keep trim setting in the mid 5 to 5.8 range as I find this works well at most weights and still enables a reasonable stick feel prior to raising the nose at rotation.

[Wingletnut]

Much the same as the others, MTOW I would set around the 6.1 mark, but its a personal preference really.

[Duck Rogers]

For a moment there I thought I'd been posting in my sleep.


Duck

[Chippie Chappie]

What Oluf says is correct. The trim setting is designed to assist the pilot in the event of an engine failure at V1 or faster. Remember, because the engine thrust line is high, a reduction of thrust (i.e. an engine fails) the nose will pitch up.

Also, it's not just weight but the distribution of weight that affects the trim setting. Full fuel and pax sitting in the back, trim is at 5.3 (or 5.4 if you want a margin against the config. warning). Lighter on fuel and pax up front, you'll need a higher trim number.

snorkboggler, yes the AFM is king, worked out by test pilots. Of course, if you'd prefer to take contradictory advice from us unknowns..... :}

Cheers,

Chips

[unablereqnavperf]

Been flying the 45 for about 1200hrs 6.0 to 6.8 works well even if you loose an engine pax always tend to sit in the front club 4 which makes the ship nose heavy. I found this range about the best!

[potatowings]

For a typical load of 2 - 3 pax sitting in the front club 4, fuel load is most critical. As soon as you start putting any significant fuel in the aft tank this pulls the trim setting back to around 5.3 (5.4 for margin of error). Less fuel and it starts moving forward. Use what's in the AFM, that way, if it does go wrong it's not your fault.

The AFM was written by the test pilots/lawyers and this keeps you safe both in the air and on the ground (in court).