Hi Ben !
Been away a couple of days ....
Unfortunately, Pierre's firewall WAS moved back - he bought a
partly built project, and the move was done even before final engine
choice ... :-( He does have a huge Odyssey battery right at
the end of the floor, AND a huge hydraulic pump for the floats
& skis, also at the rear ... probably well over 50 lb. back there !
And a light ( 9 lb. !) Prince prop up front. Not moving the
firewall gives you a full range of future engine choices, as well as
a better seating position, better visibility, and makes the panel
setup a lot easier for full-length avionics !
Most Rebels with EJ-22's have NOT had the firewall moved - and
the C of G's are usually in the 10.5 - 12 range -- mostly dependent
on battery position. Good to save securing the battery until you
can do a trial weight & balance, then just move it to the best spot !
Empty weights are usually in the 960 - 1060 range, when finished
and painted (The Sub & re-drive, with rad & coolant, is usually
only about 30 lb. or so more than a Lyc.) Of course, ALL of these
Rebels had the bungee gear, some with the die spring mod..
Most also had 3 blade or 4 blade Warp Drive props - the 4 blades
had a LOT of drag on approach - made for a steep approach, and
the engine windmilling up to 2500+ rpm !!
I've flown a few Sub Rebels, and even the stock EJ-22 works
very nicely - about 1,100 fpm climb, 105 - 110 mph cruise, on
about 5 - 6 gph mogas. The 180+ hp. modified ones are even more
exciting ! :-) And they're all SMOOOOOooooth ! ;-)
I do like the Marcotte redrive - compact & sturdy ! Most of
the early conversions used the Ross redrive - long, and some
gear problems - no longer available anyway ...
One had the stock Sub fuel pumps mounted in the bottom of
the wing tanks, on removeable plates - worked great ! The
return line came up to the roof, with a valve to direct return
flow to left or right tank, to aid in load balancing. Ideally,
the return line is not at the top of the tank, so the fuel
doesn't fall, picking up air & static .... One nice thing
about this is there were no fuel valves needed - just turn on
the pump on the tank you wanted to feed from ! ;-)
(Actually, it's still a good idea to install the valves -
for maintenance, etc. - also in the return line - just in case... )
Small valves at the bottom of the sight guages are also a
good idea - makes changing the tubes very fast & easy, and
adds a bit of safety.... (The 1/4" ones from the Renegage
work nicely ..)
The Murphy Rotax 912 cowling, with mods for easy opening,
worked very well, as the radiator mounting position was already
proven .... and it didn't look bad either !
.......bobp
-------------------------------orig.-------------------------
On Friday 30 December 2005 01:34 am,
bransom@dcsol.com wrote:
Reading over some back posts, and thinking about engines, I've got a
couple
new questions...
Pierre's Rebel with XP-360 has a CG of ~13, empty wt of 1060.
Ken's Rebel with Sub EJ22 (and dual electrics, etc) has a CG of ~9, and
that
is with firewall moved back. Empty 1040.
Is Pierre's firewall moved back?
I had always guessed that a Subaru would tuck pretty close to the firewall
and present less of a concern for forward CG than Lycomings (unless the
redrive negates this?). How have other Subaru Rebels come out for CG, and
any with original firewall position?
Thanks,
-Ben/ 496R
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