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  #1  
Old 06-19-2007, 09:22 AM
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Default Lycoming O-235 C/G

The original Long-EZ is constructed around a Lycoming O-235 engine which weighs between 245-250 lbs. I am looking for the c/g of that engine. The measurement I am looking for will be from the firewall side of the engine to the lifting strap on the top of the engine.

I need this measurement in order to calculate the plane’s C/G and determine the dimension for my engine mount for my rotary from the Cozy Girrrls.

Anyone running one of these?
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  #2  
Old 06-19-2007, 11:09 AM
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Default Re: Lycoming O-235 C/G

TMann;

OOOPPPSSS;

I was supposed to get that for you. Please forgive me, I suffer from CRS (Can't remember Squat).

I'll measure it when I go home for lunch.

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  #3  
Old 06-19-2007, 11:13 AM
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Default Re: Lycoming O-235 C/G

Waiter.........aren't you running with a larger engine?
I'm trying to get a baseline from the original plans to work from for my rotary mount.
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  #4  
Old 06-19-2007, 11:32 AM
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Default Re: Lycoming O-235 C/G

....for the sake of clarification, pic attached
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  #5  
Old 06-19-2007, 12:06 PM
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Default Re: Lycoming O-235 C/G

I'll give you both:

firewall to aft of crankcase (where the accessory case mounts to the crankcase)

and firewall to the lift ring.

IF I REMEMBER (again)

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  #6  
Old 06-19-2007, 12:10 PM
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Default Re: Lycoming O-235 C/G

The Lycoming web site says to call your local distributor for tech support.
I think I lost the guy at Omaha Airplane Supply when I said the word homebuilt.

I finally did get someone at Lycoming who was able to run down the spec which appears to be dead center at 14.75 inches.

At least I have a good starting point.

Now if I can just get a good C/G (and no C/G is not an abbreviation for Cozy Girrrl) for the 20B with Tracy's drive, I'll be where I need to be!
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  #7  
Old 06-19-2007, 12:46 PM
Lynn Erickson Lynn Erickson is offline
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Default Re: Lycoming O-235 C/G

Quote:
Originally Posted by TMann View Post
Waiter.........aren't you running with a larger engine?
I'm trying to get a baseline from the original plans to work from for my rotary mount.
with a 20B you will need the engine as close to the firewall as you can and everything else in the nose. streach the nose and make a place to put lead as far forward as you can, you will need it.
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  #8  
Old 06-19-2007, 01:01 PM
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Default Re: Lycoming O-235 C/G

I have a conical mount on my O-320.

Firewall to conical mount bushing = 8

Firewall to accessorycase/crankcase junction = 8.5

Firewall to lift hook = 16 3/4

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  #9  
Old 06-19-2007, 01:24 PM
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Default Re: Lycoming O-235 C/G

Thanks Waiter....... that seems to track well with the information I've dug up so far.
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  #10  
Old 06-19-2007, 01:37 PM
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Default Re: Lycoming O-235 C/G

Quote:
Originally Posted by Lynn Erickson View Post
with a 20B you will need the engine as close to the firewall as you can and everything else in the nose. streach the nose and make a place to put lead as far forward as you can, you will need it.
NOTE: Edited by T Mann. While I am making some mods to my plane to address these issues, I have elected to delete them from this post to avoid the possibility of supplying what may potentially hazardous information without having completed a thorough diagnosis of the design at this time.

Crunching numbers!
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Last edited by TMann : 06-20-2007 at 01:19 PM.
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  #11  
Old 06-19-2007, 01:41 PM
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Default Re: Lycoming O-235 C/G

Quote:
C/G is not an abbreviation for Cozy Girrrl
You haven't met them, have you? (running and ducking for cover)
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  #12  
Old 06-19-2007, 01:52 PM
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Default Re: Lycoming O-235 C/G

BAD DOG JOHN........BADDDDDD Dog!!
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  #13  
Old 06-19-2007, 01:56 PM
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Default Re: Lycoming O-235 C/G

Quote:
Originally Posted by TMann View Post
Now if I can just get a good C/G (and no C/G is not an abbreviation for Cozy Girrrl)
So John, are you saying there is no such thing as a good Cozy Girrrl?
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  #14  
Old 06-19-2007, 02:09 PM
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Default Re: Lycoming O-235 C/G

....er yes, thats right, Chrissi. If that means I got away with it.....
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  #15  
Old 06-19-2007, 03:03 PM
Marc Zeitlin Marc Zeitlin is offline
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Default Re: Lycoming O-235 C/G

Quote:
Originally Posted by TMann View Post
I stretched the fuse by 10 inches aft of the pilot ...
How are you determining where your new CG range should be, now that you've changed the aerodynamic center of the aircraft? You have to know where it SHOULD be before you can put it there...
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