Elan trouble

[Jim Ivey]

> Ken
 Good theory. It's like the moments on a see-saw. The fat boy has to sit closer to the pivot than the skinny guy.

Jim Ivey
> From: "Ken Thompson" <mrandmrst at comcast.net>
> Date: 2005/06/29 Wed PM 09:56:35 EDT
> To: <discussion at nsrca.org>
> Subject: Re: Elan trouble
> 
> Jerry,
> I was having a problem balancing a plane a couple of years ago.  I figured 
> out that weight on the tail has about 4 times the balancing effect that 
> weight on the nose does.  This is due to the fact that my plane had about 4 
> times the distance to the CG than the firewall did.
> This could be the effect of your glass and paint on your tail feathers, 3 
> extra oz. of glass and paint would be close to the weight you need on the 
> nose to balance, if you use the multiple of 4.
> 
> Just a theory,
> 
> Ken
> ----- Original Message ----- 
> From: "Jerry Wilson" <JWilsonJr at houston.rr.com>
> To: <discussion at nsrca.org>
> Sent: Wednesday, June 29, 2005 9:35 PM
> Subject: RE: Elan trouble
> 
> 
> > Jim,
> >
> > I don't know why it is tail heavy.  I was very surprised.  CG is noted on
> > the plan. Fuselage is painted as are horizontal stab, elevator, and rudder
> > which were also glassed.    Could be my glassing and paint job is heavy
> > although I would not have thought so much weight could be attributed to
> > this.  Rudder and Elevator servos are over the wing trailing edge as per
> > plan.  Battery pack has been moved to the firewall.  Used Central carbon
> > fiber push rod for elevator to MK dual bellcrank and MK control horns. 
> > Push
> > pull cable on rudder.  Receiver and throttle servo are about at the CG.
> >
> > Jerry
> >
> > -----Original Message-----
> > From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] 
> > On
> > Behalf Of Jim Ivey
> > Sent: Wednesday, June 29, 2005 5:24 AM
> > To: discussion at nsrca.org
> > Subject: Re: Elan trouble
> >
> > Jerry
> > Why is it  tail heavy. Maybe you are using the wrong CG point or did you
> > put servos in the tail? Is the tail painted. I think figure out why, then
> > solve the problem that way instead of adding all that weight.?
> >
> > Jim Ivey>
> >> From: "Jerry Wilson" <JWilsonJr at houston.rr.com>
> >> Date: 2005/06/29 Wed AM 07:14:53 EDT
> >> To: <discussion at nsrca.org>
> >> Subject: Elan trouble
> >>
> >> I have a dilemma and could use some advice from the group.
> >>
> >>
> >>
> >> After over a year of building I have nearly completed my Elan which is my
> >> first attempt to build a fiberglass fuse pattern ship.  It is painted,
> >> covered, servos, push rods, and engine (120 four stroke) installed.
> > Weighs
> >> about 9 lbs.  Looks pretty nice.
> >>
> >>
> >>
> >> The trouble is to get it to balance at the CG point on the plan (8" from
> >> wing LE) requires 11 oz in the nose.
> >>
> >>
> >>
> >> According to Dick Hansen's plan the weight should be 8 - 10 lbs.  So it 
> >> is
> >> still within the design range, at ~9.75 lbs.  But even if I can figure a
> > way
> >> to add 11 oz of weight to the nose, I'm afraid the plane will not fly the
> >> pattern well and am having serious doubts completing.  My intentions were
> > to
> >> fly one or two more Sportsman contests with it and then move on to
> >> Intermediate.  Would appreciate some opinions/advice from the group:
> >>
> >>
> >>
> >> Should I try to figure out a way to add 11 oz wt. to the nose securely 
> >> and
> >> finish the plane?
> >>
> >>
> >>
> >> Or abandon the ship and move on to something else?
> >>
> >>
> >>
> >> TIA
> >>
> >> Jerry
> >>
> >>
> >>
> >
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