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Old Jan 13, 2012, 04:04 AM
Registered User
QLD Australia
Joined Oct 2009
270 Posts
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High point--C of G--bolt Hole position ???

My home made blades fly OK, but I'am wondering what position people like to put their C of G and Blade Holes in relation to the "Highest point"[max thickness of chord point] of their blades?

My holes are on the "highest point"[apx 30% from leading eadge], and my C of G is apx 10% behind the bolt holes[apx 40% from leading eadge].
They are all balsa blades[no harder/denser wood in LE].

Wondering how other people set theirs up??

Regards, M
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Last edited by minirotor; Jan 14, 2012 at 02:19 AM.
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Old Jan 13, 2012, 09:40 AM
AND FOR MY NEXT TRICK....!
jodini's Avatar
Omaha Millard, Nebraska, United States
Joined Sep 2004
4,062 Posts
You want your bolt hole on the highest point, but you want your CG to be in the same spot. So either you need to add weight to the LE of your blades or move your hole back.

My two cents.
Joe
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Old Jan 13, 2012, 07:25 PM
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QLD Australia
Joined Oct 2009
270 Posts
Thanks Joe.

What are the flight results of C of G too far foreward?

And too far back of the bolt hole[high point]?

Regards, M
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Old Jan 13, 2012, 10:31 PM
AND FOR MY NEXT TRICK....!
jodini's Avatar
Omaha Millard, Nebraska, United States
Joined Sep 2004
4,062 Posts
I think the blades will not center very well. For example if the CG of the blades if forward of the hole, the blades will not swing straight out but instead slightly forward. (I think I have that right). Anyway, you want them close to the hole. You should be able to just add a little strapping tape to the LE to get the CG more forward.....worth a try!
Joe
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