Today's Message Index:
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1. 04:35 AM - Re: Rotax 912 in KIS (fr3dcat)
2. 04:38 AM - Rotax/Nose wheel good effect? (tmclam@comcast.net)
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| Subject: | Re: Rotax 912 in KIS |
I have not done this or thought about it for a KIS.
Here's some of what I know.
1. It is very unlikely such a motor mount exists that would plug into the KIS firewall
on one end and a Rotax on the other. Therefore it is likely you would
have to build it.
My Miller WM-2 is a one of a kind aircraft and the motor mount was buckled and
had corrosion and we tried to match up several different airframes to no avail.
It used an A65 and plans said the mount was from a L-3 but it was not. The
firewall side is the problem.
2. What we did, (and what you could do) is to take a good TR-1 mount and transfer
drill it into tooling plate (see the attachment photo). You will have to fixture
the distance from the firewall to each engine mount (X,Y and Z dimensions).
Then using ultrasound (or destroy the mount by cutting the tubes) find the
diameter and wall thickness of the 4130 tube.
3. The thrust line represents the crankshaft center line driving the prop. Thrust
lines are set for the aircraft/engine match based on "P factor". Its why
some aircraft take a lot of rudder on takeoff and some don't. I flew a KR-2 that
had it wrong and when you would take off you had to gingerly advance the throttle
to keep it on the runway and use a ton of rudder on takeoff. Power off
approaches were messed up to. Knowing what Rich Trickle used for thrust line
would be helpful. Normally you are talking about something like down 1.5 degrees
and Left 2 degrees. But you will need to figure it out.
4. You will have to have either drawings or a way to measure the crankshaft center
and relative location of the front of the engine. Unfortunately the easy
measurement is to the engine mounts but the money end is the crank flange. You
can come close with tram shots or possibly photograph means but your calibration
scale and true angles could come back to bite you.
5. We are assuming you have access to and are good with a tig welder and can fabricate
or know of someone who could do this. Someplace like Aerospace Welding
in Minneapolis does this thing all the time, but there are a ton of dimensions
they need. If there are any dimensions you give them that are wrong, you
own it. It is probably easier to do this in your own shop.
6. You will have to fit all the accessories like oil coolers under the cowl.
7. You might have to fabricate a new exhaust.
8. Your post mentioned cowling. Yep. Maybe it fits and existing, maybe not.
It is easy to weld a mount. put it on the airplane and find out the crank is not
centered in the cowl hole (off center) and have to make a second one.
I'm not trying to scare you, just let you know this is a big project. Like maybe
a year if you had mount, cowling and exhaust and you design and build weld
tools.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=469077#469077
Attachments:
http://forums.matronics.com//files/img_2347_347.jpg
Message 2
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| Subject: | Rotax/Nose wheel good effect? |
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