lml@lancaironline.net Mailing List Archive

I have been doing some measurements both static and in flight on a Lancair 320 and found minimal stick movement. The top of the stick moves only about 1" from 195mph / -7º flap and 80mph / 25º flap with 0º flap cruise stick position in between. The elevator pushrod moves just under 1/4" for the same flight range. This observation is what caused me to ask this question. I have not done any stick force measurements as yet.

Wolfgang

From:	Christian Meier <lancair@meier.cc>
Sender:	<marv@lancaironline.net>
Subject:	Re: [LML] flap coupling
Date:	Mon, 02 Aug 2010 07:36:08 -0400
To:	lml@lancaironline.net

Wolfgang,

I thought about installing a bungee cord.

My problem is following. Having a IO390 I'm very nose heavy and I built my elevator trimtab 4" shorter. So coming in for landing below 95kts

the trim is not enough. So I need to pull with 0.5kg to keep the plane in a stable descent.

I have 2 possibilities to fix the problem: I can either install the original spring trim or I install the bungee at the flap actuator.

Maybe the spring trim is the better solution because when you change flap position while landing you also have to adjust the trim tab on elev.

As I have a throttle quadrant and a glove box there is nearly no room for the spring trim. Maybe someone has a picture from a spring trim installed

different from the plans of Lancair.

Christian

Has anyone thought about a spring coupling from the flap actuator th the elevator push rod ?