Elan trouble

[Nat Penton]

OK Jim , you've gone too far. Let's leave the fat boy out of this.

----- Original Message ----- 
From: "Jim Ivey" <jivey61 at bellsouth.net>
To: <discussion at nsrca.org>
Sent: Wednesday, June 29, 2005 10:25 PM
Subject: Re: Re: Elan trouble


>
>> 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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