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Rotax engines

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Rotax engines

Postby patrebert » Mon Mar 03, 2014 4:43 pm

Am building a Onex, considering 912 power. How have Sonex builders using this engine dealt with the lighter weight compared to Aerovee? More forward engine mount? ballast?
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Re: Rotax engines

Postby fastj22 » Mon Mar 03, 2014 9:04 pm

What weight are you using for the 912?
I thought the 912 was much heavier than an Aerovee.

John Gillis
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Waiex N116YX, Jabiru 3300, Tail dragger,
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Re: Rotax engines

Postby Mike53 » Mon Mar 03, 2014 9:41 pm

http://www.rotaxservice.com/rotax_engin ... 12ULSs.htm
Now if I could only afford one
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I know but one freedom, and that is the freedom of the mind.
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Re: Rotax engines

Postby fastj22 » Mon Mar 03, 2014 9:51 pm

140.6lbs is pretty impressive. like the Jab 2200, I would expect you would need to build an engine mount that hangs it 6 to 8 inches forward from the Aerovee mount.

John Gillis
SEL Private, Comm Glider, Tow pilot (Pawnee Driver)
Waiex N116YX, Jabiru 3300, Tail dragger,
First flight, 3/16/2013. 403 hours and climbing.
Home: CO15. KOSH x 5
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Re: Rotax engines

Postby SvingenB » Tue Mar 04, 2014 1:18 pm

Turbo and CS propeller

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Reserved LN-ENX for Onex #134
Onex build log
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Re: Rotax engines

Postby patrebert » Thu Mar 06, 2014 11:55 am

The 140 pound number doesn't include muffler (8.8 lbs) and radiator (2.2 lbs), neither of which are typically included in an aerovee installation. And what? 2-4 lbs of coolant? Getting to be almost a dead ringer for Aerovee weight, at least with nikasil cylinders. One of the main attractions of the iS to me was its low cruise fuel flow, but do I understand correctly that that's also available on the carbureted engines with the addition of an available mixture control modification?
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Re: Rotax engines

Postby Mike53 » Thu Mar 06, 2014 6:29 pm

Maybe i'm missing something but according to that link I put up those are included in the weight :?:
Mike
I know but one freedom, and that is the freedom of the mind.
Antoine de Saint-Exupery
Onex 080 now flying,Hummel 85HP ,Tri gear,GRT Mini X EFIS,and EMS,iFly 740 GPS
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Re: Rotax engines

Postby rizzz » Thu Mar 06, 2014 6:51 pm

Mike53 wrote:Maybe i'm missing something but according to that link I put up those are included in the weight :?:

Yes, that was my understanding as well.
140lbs is complete "installed weight" including exhaust system, radiators etc. Excluding those the engine only weighs 124lbs.
The 160lbs stated for the aerovee on the aeroconversions website however does not include exhaust and a few other things.
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Re: Rotax engines

Postby patrebert » Fri Mar 07, 2014 9:34 am

I'm working from the Operator's Manual for Rotax Engine type 912i Series, page 6-2:
912 iSc/iS
63.6 kg(140.2 lb)

exclusive of: engine suspension frame, exhaust system, fuel pumps assy, cooling baffle, radiator, oil cooler.
The iS is a bit heavier; perhaps you're thinking of the ULS numbers.

By the way, does anyone know what the engine suspension frame weighs?
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Re: Rotax engines

Postby patrebert » Fri Mar 07, 2014 10:00 am

Realized my original post didn't specify iS, sorry bout that. Am considering both now though, does anyone have experience with mixture control on the carbureted engine?
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