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1. 10:44 AM - Rotax engine mount plate (Jay Dub)
2. 01:11 PM - Re: Rotax engine mount plate (jaydub)
Message 1
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| Subject: | Rotax engine mount plate |
I'll call the new owners of the Kolb company next week but since they are fairly
new owners (they may not know of all the design changes from early to later
models) I thought I'd throw this out on the list.
For a little back history I bought a FSII (7 ribs per wing and had the back seat)
built around 1990 or so and it came with a 12.0 hour Rotax 447 (engine castings
say 89 or 90 depending on the castings so this is how I'm dating the airplane)
and ground adjustable Ivoprop. I overhauled the engine and it's ready to
run. This plane included everything but most of the fuselage. The only fuselage
that came with it was the engine mounts, mount plates and rear drag link spar
and its u-joints. I'll call this plane #1. In my quest to find a fuselage I
picked up an entire FSII that was picked up from Kolb in late 2014 or early 2015.
I decided to finish building the kit (I'll call plane #2) because I have
a paper trail and use the 447 from plane #1.
Plane #1 is a 1990 model (based on engine casting dates) with the 2 piece engine
mounting plate with a gap in the middle under the engine. The drawings I have
for plane #2 shows a one piece "hour glass" shaped plate. Last night I was looking
over my 447 mounted on plane #2 using the mounts and mount plates from
plane #1. I was comparing it to the chunk of fuselage/engine mount from plane
#1 and I notice the rear engine mount pad (the upside down U shaped piece that
the Lord mounts bolt onto) goes back further than the spar on plane #1 than it
does on plane #2. It seems that means my engine is further forward with this
setup but I don't know for sure. I also noticed there is some strapping welded
onto the U shaped piece going down to structure below that the earlier one doesn't
have. I assume this is so one can run a higher hp engine like a 582 or
the higher powered Hirths on the newer FSIIs because the torque and vibration
is better braced? I was surprised to find a difference of that magnitude.
Anyone familiar with the change in the Firestar II engine mounting for Rotax between
1990 and 2015? Does the hourglass shaped mount plate move the engine back
further from the drag link u-joints like the earlier models?
I can try to get photos out in the next few days if that helps. I'm hoping someone
here remembers why that was all changed and if I need to do something different.
Thanks,
Jay
Message 2
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| Subject: | Re: Rotax engine mount plate |
Here's some photos
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510626#510626
Attachments:
http://forums.matronics.com//files/img_20230415_123723295_shrunk_822.jpg
http://forums.matronics.com//files/img_20230415_122430034_shrunk_618.jpg
http://forums.matronics.com//files/img_20230415_122403380_shrunk_164.jpg
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