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mounting an OS 91 FS into a Super Chipmunk

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mounting an OS 91 FS into a Super Chipmunk

Old 03-15-2010, 01:13 PM
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scottm50
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Default mounting an OS 91 FS into a Super Chipmunk

hi - just about to mount an OS 91 FS in my CG Super Chipmunk but not sure whether to mount it at 90 degrees or inverted. Any issues with either or is one way better than the other? - any info appreciated - many thanks
Old 03-15-2010, 01:19 PM
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MinnFlyer
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Default RE: mounting an OS 91 FS into a Super Chipmunk

I try to avoid an inverted mount if I can. I mounted it out the side in both of my Goldberg Chippys.

An advantage to a side mount is that you can leave the cowl in two pieces and screw them together instead of gluing - this way, if you ever need to get to the engine or remove it, you can unscrew half of the cowl and don't need to remove the spinner and prop
Old 03-15-2010, 08:39 PM
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donkey doctor
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Default RE: mounting an OS 91 FS into a Super Chipmunk

Hello; I put my Saito 80 in inverted, my Chippy is in the RCAF trainer scheme. No trouble with the installation or with running. The only problem is removeing the glow driver before taxiing out to fly. I don't understand why so many people have trouble with inverted installations.
Old 03-16-2010, 12:06 AM
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NM2K
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Default RE: mounting an OS 91 FS into a Super Chipmunk

ORIGINAL: scottm50

hi - just about to mount an OS 91 FS in my CG Super Chipmunk but not sure whether to mount it at 90 degrees or inverted. Any issues with either or is one way better than the other? - any info appreciated - many thanks


While I avoid inverted installations for two-strokes other than YS, I would mount said engine inverted in said airplane in a heart beat, although being able to retain the easy removability of the original two piece cowl might make it tempting to go with the sidewinder set up.


Ed Cregger
Old 03-16-2010, 01:26 AM
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dan4466
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Default RE: mounting an OS 91 FS into a Super Chipmunk


ORIGINAL: donkey doctor

I don't understand why so many people have trouble with inverted installations.
I dont either. I have had at least 6 4-strokes all inverted and I dont remember any of them having a deadstick. Theres nothing uglier than an engine sticking out the side of the cowl. I do suggest you use a Dubro Remote Safety Ignitor. Makes it a lot easier.
Old 03-16-2010, 05:50 AM
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Default RE: mounting an OS 91 FS into a Super Chipmunk

I guess I should clarify...

I have never had any ENGINE problems with inverted mounts.

The things I don't like are:

1 - It's a pain to get the glow driver on

and

2 - If you have a nose-over, your engine becomes a nose-skid and takes the brunt of the grinding.

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