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mounting engine 0n sig 4*

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Old 01-18-2003, 03:49 PM
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F.Ciccarello
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Default mounting engine 0n sig 4*

plans call for mounting engine up right... what do you think of mounting engine 90 deg. or inverted?
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Old 01-18-2003, 05:44 PM
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2rolls
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Default 4* engine mounting

Why??
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Old 01-18-2003, 05:56 PM
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sandal
 
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Default mounting engine 0n sig 4*

An upright engine will place the carb above the top of the tank. A side mounted engine would place the carb closer to the centre line of the tank, but I am not sure that it is necessary.

I have used an Irvine .53 and an OS FS-52S on mine, mounted upright. The Irvine works perfectly. The FS does not. From the sound of it, it seems to be too rich when the plane is inverted. In theory, this can be expected since a low tank will be too high when the plane is upside down. I have set the needle valve so that it picks up a FEW rpms when I hold the nose straight up, and I don't want to go leaner than that. But there might be a way to set the needles to avoid this problem. Or I could buy a Perry pump.

If I were going to build my 4* now, I would mount the engine on its side. On the other hand, there are thousands of 4*s out there with the engine upright that work perfectly.
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Old 01-18-2003, 06:17 PM
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F.Ciccarello
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Default engine mounting 4*

2rolls-----I just wanted somethig differant.

sandal---Good info, I think the engine will be installed up right.

thanks.
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Old 01-18-2003, 06:56 PM
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p.j
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Default mounting engine 0n sig 4*

I have over 50 flights on my 4* 40 using my TT PRO 46 upright and it runs perfect.What more could you want!
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Old 01-18-2003, 07:57 PM
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Default 4* engine mtg

I am at the same place,As near as I can tell my super tigre 40
muffler won't clear @ 90 I would have to go to 45 to clear. to heck with it striaght up it goes .
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