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Cox Engines Forum  :: Models and Modeling :: Models and Modeling

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Post  Cribbs74 Tue Nov 13, 2012 9:19 am

When I originally balanced the Satan. I went with 1/3 of the chord as my CG point. Obviously that ain't it. The brodak plans show nothing Rolling Eyes

Anybody know where it's supposed to be?
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Post  JPvelo Tue Nov 13, 2012 11:28 am

I think the Goldberg plan shows 7/8 inch behind the L.E. will check plans later today.
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Post  Cribbs74 Tue Nov 13, 2012 12:31 pm

I'd appreciate it!!! So would my daughter who nearly got an unwanted haircut. I think I need to build me another stooge so I don't maim my children.......

Ron
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Post  John Goddard Tue Nov 13, 2012 12:43 pm

Halfway between a third and a quarter at the cord is usually
A good starting point Ron.
With R/c the main spar is usually it or VV close.
I've got a proper calculator
Tucked. Away somewhere I'll see if I can find it.

Very Happy
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Post  Cribbs74 Tue Nov 13, 2012 1:22 pm

John Goddard wrote:Halfway between a third and a quarter at the cord is usually
A good starting point Ron.
With R/c the main spar is usually it or VV close.
I've got a proper calculator
Tucked. Away somewhere I'll see if I can find it.

Very Happy

By that standard John I should have been fine. I wish you could have seen that puppy flip. Talk about some tight loops it didn't even go forward. Something wasn't jiving that's for sure.
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Post  RknRusty Tue Nov 13, 2012 2:12 pm

cribbs74 wrote:
John Goddard wrote:Halfway between a third and a quarter at the cord is usually
A good starting point Ron.
With R/c the main spar is usually it or VV close.
I've got a proper calculator
Tucked. Away somewhere I'll see if I can find it.

Very Happy

By that standard John I should have been fine. I wish you could have seen that puppy flip. Talk about some tight loops it didn't even go forward. Something wasn't jiving that's for sure.
Mine is 7/8" from the LE too. That is forward of 33.3% or 25% chord. It's no wonder it flipped. Even balanced correctly, if you launch with full up it'll flip.

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Post  JPvelo Tue Nov 13, 2012 4:33 pm

https://i.imgur.com/Tpczj.jpg
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Post  Cribbs74 Tue Nov 13, 2012 4:35 pm

Thanks Jim!

Ron
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