[NSRCA-discussion] Genesis revisited

Sun Apr 11 04:53:20 AKDT 2010

John,

Here' a simple gauge you can make from clear lexan to set you fin vertical, as Verne has recommended. The vertical is simply pinned onto the fin post's. Adjust where the fin is pinned so that the plane sits level. The triangle base is set on the table or other flat surface you have. 

The other horizontal lines are alignment marks for the stabs CL.....the stab is pinned onto one of the horizontals while the glue cures. Takes the guesswork out of stab alignment.... Works great with anhedral stabs too. BTW, the second thing I set on the plane is the fin and stab relationship. The first thing is always the horizontal reference line on the fuse....that is, the angle at which I want to fuse to fly at. On my designs, the stab is centered on this line, but other prefer stabs above it or below it. It doesn't matter...the triangle gauge works fine any way you want it

The height gauge is by far the best set-up tool pattern people can own. I'v discussed its usefulness in the KFactor many years ago now. There are some varieties that are very inexpensive, like less than 50 bucks. You want one that's at least 1 foot high

Matt Kebabjian

-----Original Message-----
From: Richard Strickland <pamrich47 at hotmail.com>
To: NSRCA <nsrca-discussion at lists.nsrca.org>
Sent: Sun, Apr 11, 2010 12:15 am
Subject: Re: [NSRCA-discussion] Genesis revisited

Just a thought--if its been sitting in a box of unknown orientation for some time, it might not hurt to let it sit in the sun for a while before doing anything and see if any of its misalignment goes away--or gets worse... (Murphy follows me around...)
RS

> Date: Sat, 10 Apr 2010 22:08:33 -0600
> From: jgghome at comcast.net
> To: nsrca-discussion at lists.nsrca.org
> Subject: Re: [NSRCA-discussion] Genesis revisited
> 
> Verne,
> 
> Thanks for the good suggestions. I will set up to reference off the fin 
> centerline.
> Although we cut the holes for the wing and stab tubes, no reinforcing 
> has been done, no epoxy used- so modifications will be easy. Probably 
> have to shim the gear slightly to get the plane to sit level. Sounds a 
> lot easier and much more likely to work than trying to straighten the tail.
> What are you using for a reference to establish stab incidence = 0 and 
> check the downthrust of the nose ring if you are not trusting any marks 
> on the fuselage?
> 
> Thanks again,
> 
> John
> 
> Verne Koester wrote:
> > John,
> > You may be far better off in the long run cutting out the wing and stab tube
> > sockets. Then jig up the fuse so the fin is straight up and down (90 degrees
> > to your table). At that point, you just need to glue the new sockets in so
> > the tubes are parallel to the table. I realize I'm over-simplifying the
> > process, but I think it would give you the best chance for long term
> > success. If you don't ruin the fin by bending it with a heat gun, it will
> > almost certainly end up where it started after being out in the sun for
> > awhile. BTW, I never trust alignment marks molded into a fuse. My first
> > alignment steps are to make the fin perpendicular to my table and check out
> > the down thrust molded into the nose ring at the same time. Once those are
> > set, I make my own marks (referenced off my table) as close to the molded-in
> > marks as possible. When you consider that two fuse halves are joined in the
> > center, even a few thousands shift somewhere can equate to things being way
> > out whack at the wing tips. One of many reasons I prefer kits where the
> > builder glues in the sockets rather than the manufacturer.
> >
> > Hope this helps
> >
> > Verne Koester
> >
> > -----Original Message-----
> > From: nsrca-discussion-bounces at lists.nsrca.org
> > [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of John Gayer
> > Sent: Friday, April 09, 2010 10:47 PM
> > To: NSRCA Mailing List
> > Subject: [NSRCA-discussion] Genesis revisited
> >
> > I'm helping someone from our club build an old Genesis kit. Everything 
> > was going along just fine until it came time to install the wing and 
> > stab tubes. The wing tube is just fine, ends up parallel to the belly 
> > pan within a millimeter at the ends of the tube running through the 
> > fuselage.
> >
> > The problem occurs at the tail end. The fin is 12 mm out of plumb and 
> > the stab tube(using the indicated marking on the fuselage) is tipped 
> > about 10 mm in the same direction as the fin. Also the marks on the 
> > fuselage for the stab tube and the front pin are not the same distance 
> > up from the fuselage bottom so it appears these marks were not 
> > accurately set in the mold. Rather a mess.
> >
> > A long time ago when I ran into the crooked fin problem , I managed to 
> > get it lined up by using a heat gun and gentle pressure. Then using 
> > braces, tail post and a former, try to lock in the new fin position.
> >
> > Anyone have any experience with this netbox kit that ran into any of 
> > these problems or were all the others perfect right out of the box?
> >
> > I would really appreciate any guidance on this that I can get.
> >
> > Thanks
> >
> > John
> >
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> >
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> > 
> 
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