Goldberg Bücker Jungmann experience needed

[Anders M]

I'm currently building a Bücker Jungmann from Goldberg. Anyone got any
experience from this model. Engine suggestions, building tricks etc. would
be greatly appreciated.

Thanks

Anders

[Robert C. Haas]

Hi, I am working on my second Bucker, I loved the first but lost it soon
after a midair damaged the top wing.

Mine has a YS 140 which is excellent power for the plane. A YS120 would
probably be fine as well. I used aftermarket fiberglass cowl, wheel pants
and canopy/front turtle deck pieces, much nicer than the abs/clear plastic
stuff.

The weakest part of the standard construction is in the interplane couplers
and their attachment points to the wings (holes in a 1/16 ply rib recessed
beneath the wing sheeting). I built thicker aircraft ply ribs with tabs
that extended above the wing sheeting for the first one, and for the second,
i'm using a very clean setup with a threaded 2-56 rod, with an allen head
screw brazed on the other end. This rod is sent through the lower wing into
a hole in the lower surface of the upper wing where a blind nut is buried in
a hardwood insert. The rod passes through an airfoil shaped aluminum tube
b/t the wings, leaving a very clean strong attachment with no unsightly
hardware.

I use pull pull for the rudder, and an MK coupler for the elevator halves
with a carbon fiber pushrod to connect it to a servo on a tray halfway back
to the tail (where the rudder servo is also located). All futaba 9202's.
That way, the gas tank can be big and located right on the cg.

Its a great flying airplane and i really loved my first one. I cant wait to
get the second one up in the air. I know you will enjoy yours too.

Robbie Haas

Anders M wrote in message <78atug$49b$1...@plug.news.pipex.net>...

[A.T.]

Fibreglass cowl..ensure upper cabane blind nuts are fully secured with
extra ply to lock them in place and then ensure the bolts are secured
with a little ca or similar because they do work loose in the lite ply
(lite ply crushes) and to access one must cut ugly holes in the top
cowl. Rework the struts as the use of nylon clevis into lite ply ribs
accesssed through a little hole in the wings x8 is a right pain in the
posterior...there are quicker & easier methods. A separate servo for
each elevator half (micro set on sides at tail coupled with TX mixer
work v/well....thin 15" wire pushrod with kit is v.flexible. K&B 100 is
a good engine match for me = provides unlimited knife edge etc
regards
Alan T.

[QUICKRACE]

Use carbon fiber (liberally) at the center wing attachment points.
I put a Moki 1.8 on mine and all the radio equipment at the back to balance it.

If you are an acconplished flyer, keep the CG at the back end of recommended
area. If not, toward the front. Snmall elevator and rudder movements are all
that's necessary for most aerobatics.
I also installed tail flying wires. A Cline puimp is at the engine firewall to
insure fuel supply.
Mine performed at TOC levels...which is exactlt wht it was built the way I did.
Great IMAC model also!
Luv it.

[Robert C. Haas]

ys140 is best engine choice for this airplane, fantastic flyer, i loved
mine, lost in a midair and now finishing up another.

robbie haas

QUICKRACE wrote in message <19990123185749...@ng-fr1.aol.com>...