Mark
I think I going to move the engine a little further fwd such that it calculates
out that full fuel and pilot puts the cg right at the fwd end of the cg range.
What about changing the location of the cg range, or should I stay with RR
location?
And you don't see a problem with lowering the centerline to 3 to 3.25" below
the longerons? I will still have about 9.5" ground clearance.
Pete
> To: krnet at list.krnet.org
> Date: Wed, 30 Mar 2016 21:42:07 -0500
> Subject: Re: KR> C.G location, Engine centerline
> From: krnet at list.krnet.org
> CC: ML at N56ML.com
>
> Pete Klapp wrote:
>
> > I have done calculations with pilot plus 1/2 fuel and it falls at 2" into
> > the RR cg range, and pilot & passenger plus 3/4 fuel and cg falls within
> > 6" preferred cg range, the later coming in right at the aft edge of the
> > preferred range. I'm thinking that I would like set the engine such that
> > with me and 1/2 fuel that the cg falls right at the fwd cg limit.<
>
> N891JF is right at the forward limit with pilot and full fuel, and I can
> tell you that I need a lot of UP trim to keep the nose up, but it's a small
> trim tab and I still have plenty of travel left, so it does work. Forward
> is certainly better than too far aft, and even though yours has a nosewheel,
> I wouldn't expect any problems being able to rotate the nose up on takeoff.
> It's easy enough to move some things aft if needed later, and it's better to
> start with max stability, rather than min.
>
> > Next question: The horizontal engine centerline with the temporary engine
> > mount is 2.5" below the top of the upper longerons. I'd like to drop the
> > centerline a little more, 1/2 to 3/4", for better clearance for engine
> > cowling and cooling plenum. Anyone see a problem with that.<
>
> My CG is 2.375" below the longerons on N56ML, and it's not a problem at all
> in any respect with my plane.
>
> Mark Langford
> ML at N56ML.com
> website at http://www.N56ML.com
>
>
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