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General control line discussion => Open Forum => Topic started by: Paul Wood on December 09, 2010, 02:34:56 PM

Title: 1952 Nobler C.G.
Post by: Paul Wood on December 09, 2010, 02:34:56 PM

Guys,

I'm just starting to cut lumber on a 1952 Nobler (MAN plans).  The CG location is not shown, but my calculations show the bell crank pivot point to be at 25% MAC, which is 6.25" forward of the flap hinge line.  Any suggestions as to the best CG location.  I absolutely hate to add nose or tail weight after the plane is complete.  I did a search, but didn't find the answer.  Thanks for your input.

Paul

Title: Re: 1952 Nobler C.G.
Post by: Paul Wood on December 10, 2010, 07:13:57 AM

Thanks Ty.  Your info makes perfect sense and appears to be a good starting point in relation to the MAC.  I agree to never use the bellcrank as a reference.  I was just supplying the info FYI in case someone thought the bellcrank should be repositioned.  Thanks again.

Paul

Title: Re: 1952 Nobler C.G.
Post by: Bill Little on December 10, 2010, 09:36:05 AM

Hi Paul,

I agree with Ty and would "start" around the high point of the wing.  I have done that for around 50 years and it seems to work on 99% of the planes I have ever built.  Never had a really tail heavy one doing it that way, which is good. ;D  We can always add tail weight if needed.

Big Bear

Title: Re: 1952 Nobler C.G.
Post by: PJ Rowland on December 10, 2010, 07:37:21 PM

 y1 = Highpoint really good starting point, depends on engine. Big Power..

Title: Re: 1952 Nobler C.G.
Post by: Robert Zambelli on December 11, 2010, 07:50:01 AM

My Nobler flys perfectly with the CG three inches back from the lead edge, where it meets the fuselage.

Bob Z.

Title: Re: 1952 Nobler C.G.
Post by: Bill Brown on December 11, 2010, 08:18:30 AM

hello everyone, I am building a 52 Nobler from plans and the CG shown on the plan is at the spar were it meets the fuselage. Am building the wing and only have the wing rib number one to go by.It was fun to figure out rib size to wing tip.Have wing almost done.

Title: Re: 1952 Nobler C.G.
Post by: RogerGreene on December 13, 2010, 08:43:24 AM

Yes, CG on the green box Nobler plans shows on the middle of the "D" tube spar.

Happy Flying
Roger