Where to balance my plane when spar is moved.  
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All Forums >> RC Airplanes >> S.P.A.D. Aircraft - Coroplast design >> Where to balance my plane when spar is moved.
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Where to balance my plane when spar is moved. - 7/15/2003 7:37:27 AM   
troyp



Posts: 416
Joined: 8/17/2002
From: Broome, AUSTRALIA
Status: offline 		Whilst building my coropsit I had to move the spar back about 1/2" as I felt it was to close to the LE. I think this was due to a slight mistake when upscaling my measurements. Anyway I am now wondering where to check my C of G from.

Should my C of G be taken from...?

A. Using the original spar position as the balance point?

B. Using the new slightly further back spar position?

C. Using a pre-determined measurement from the LE, and if so what is this measurement?

Or

D. Phone a friend/ use 50 50 or ask the audience...?
(Which is what I am actually doing.)

Thank you.

_____________________________

“Not within a thousand years would man ever fly.” Wilbur Wright, 1901
       Post #: 1

Where to balance my plane when spar is moved. - 7/15/2003 8:14:17 AM   
MrGreenSpeed



Posts: 628
Joined: 12/31/2002
From: Lakewood, NY, USA
Status: offline 		Moving the spar back1/2 inch moves the center of lift back 1/2 inch.

Start with the CG where it is in the plans, You may have to move the CG back to get top performance.

The first flight of a new plane I use a heavy hub to make sure the plane is some what nose heavy.

Then start moving the CG back 1/8 th inch at at time till it snaps out of the top of a loop with full elevator.

Good luck.
Mr. G

(in reply to troyp)
       Post #: 2

Question - 7/15/2003 8:22:20 AM   
crashlessons


 

Posts: 108
Joined: 7/1/2003
From: Orchard, NE, USA
Status: offline 		I'm new enough to 3d and funfly type flying that I'm not familiar with the term "snapping out". What exactly does this refer to?

Thanks!!!!

_____________________________

Thomas Jefferson understood, appearantly no one was listening.

(in reply to troyp)
       Post #: 3

Where to balance my plane when spar is moved. - 7/15/2003 8:35:31 AM   
Woodsy



Posts: 1745
Joined: 9/24/2002
From: DrouinVictoria, AUSTRALIA
Status: offline 		"snap out" when talked about with referance to loops etc is when the plane wont do a full loop with full elevator, it sort of rolls out of the loop on its own for no aparent reason this can be caused by a few things one is too much elevator authority and the others i think are wrong CG & too small tail feathers may be some one else has abetter explanation


_____________________________

"If it's stuck.......... force it. If it breaks it needed replacing anyway"
www.nex.net.au/users/rwood

(in reply to troyp)
       Post #: 4

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All Forums >> RC Airplanes >> S.P.A.D. Aircraft - Coroplast design >> Where to balance my plane when spar is moved.
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