tdo
Heliman
Location: Germany
My Posts This: Topic Forum | Hi Don,
most important question upfront:
WHICH Graupner UNI mechanics is it?
An Uni Expert? Or an Uni 2000?
The difference ist quite easy to see,
The Uni Expert has a black gearwheel at the bottom of the mainshaft
(ok, sometimes you see a "pro version", a mixture of red and brown),
but this wheel is always a single piece.
The Uni 2000 however has two wheels attached, one for the tail drive,
one for the main drive, and both of white color.
Here's an example for the Uni Expert:
http://www.rc-heli-fan.org/download...hp?id=40239&t=1
and the Uni 2000:
http://www.rc-heli-fan.org/download...hp?id=40240&t=1
Reason to ask: The gear drive of the Uni Expert series is simply too weak to stand a .90 engine.
Only the Uni 2000 was designed for up to .90 engines and their torque.
The Uni Expert was fine with .60 engines, but not more.
There was (maybe still is) an upgrade available, but it's quite expensive, price comes almost close to a new mech.
For the clutch assembly: I don't know the century parts, but one thing's for sure, the original clutch and cooling fan work simply perfect.
There's normally no need for those parts for any kind of upgrade.
(Aside from the fact that the original clutch assembly require an engine with the long 8 mm shaft, which you don't find that often any more.
There's one O.S. engine, the OS MAX 91 RZ-HG, see
https://shop.graupner.de/webuerp/servlet/AI?ARTN=2711
which would fit perfect.
Recommended silencer: something from Zimmermann (I'll try to locate one)
since the silencer recommended from Graupner:
https://shop.graupner.de/webuerp/servlet/AI?ARTN=2253
doesn't seem to be available any longer.
Thilo
Edit: just surfed thru the century website; the parts you mentioned, HI3010 and HW3011 derive from a .30 mechanic, I don't believe that they would last too long on a .90 engine.
Also I'd doubt that those parts really integrate into the original gear drive, depending on the form and size of the teeth.
Original is Modul 1, 24 teeth.
You have to be a bit careful when selecting the correct gear transmission ratio, depending on what engine you finally choose.
If you want to, I can send you some considerations and thoughts that worked out when I installed a .91 OS on my Graupner Bell 230  |
. Don in Indy
