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Rotax 912 in KIS

 
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JohnForde



Joined: 06 May 2017
Posts: 1

PostPosted: Sat May 06, 2017 6:26 pm    Post subject: Rotax 912 in KIS Reply with quote

Has anyone ever put a Rotax 912 series engine in a KIS or even attempted it?
It's about the same weight as a Limbach. Would a Rotax engine mount from another aircraft be usable? Limbach cowling?


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fr3dcat



Joined: 27 Oct 2016
Posts: 2

PostPosted: Sun May 07, 2017 3:35 am    Post subject: Re: Rotax 912 in KIS Reply with quote

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.


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IMG_2347.JPG
 Description:
Here is the weld tool for the motor mount. The round base plate is the aircraft firewall and the top part is the engine mounts. All thread sets each mount location and in turn the thrust angle.
 Filesize:  310.08 KB
 Viewed:  688 Time(s)

IMG_2347.JPG


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gbrighton(at)skymesh.com.
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PostPosted: Tue May 09, 2017 4:07 am    Post subject: Rotax 912 in KIS Reply with quote

Howdy John ... Re Rotex ... well anything's possible i guess ... but
realistically 100 HP say is only going to under power the TR-1 ... and
ensure it fails to for fill its design capabilities ..,
Just my 2 bobs worth .. ,
Cheers
Graham

--------------------------------------------------
From: "JohnForde" <40.john(at)gmail.com>
Sent: Sunday, May 07, 2017 12:26 PM
To: <kis-list(at)matronics.com>
Subject: Rotax 912 in KIS

Quote:


Has anyone ever put a Rotax 912 series engine in a KIS or even attempted
it?
It's about the same weight as a Limbach. Would a Rotax engine mount from
another aircraft be usable? Limbach cowling?


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=469071#469071


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gbrighton(at)skymesh.com.
Guest





PostPosted: Tue May 09, 2017 4:21 am    Post subject: Rotax 912 in KIS Reply with quote

Howdy John ... Re Rotex ... well anything's possible i guess ... but
realistically 100 HP say is only going to under power the TR-1 ... and
ensure it fails to for fill its design capabilities ..,
Just my 2 bobs worth .. ,
Cheers
Graham

--------------------------------------------------
From: "JohnForde" <40.john(at)gmail.com>
Sent: Sunday, May 07, 2017 12:26 PM
To: <kis-list(at)matronics.com>
Subject: Rotax 912 in KIS

Quote:


Has anyone ever put a Rotax 912 series engine in a KIS or even attempted
it?
It's about the same weight as a Limbach. Would a Rotax engine mount from
another aircraft be usable? Limbach cowling?


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=469071#469071


---
This email has been checked for viruses by AVG.
http://www.avg.com



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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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