[NSRCA-discussion] Genesis revisited

[John Gayer]

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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