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-   -   Balancing Bi Planes (https://www.rcuniverse.com/forum/questions-answers-154/11620843-balancing-bi-planes.html)

dasintex 08-19-2015 04:19 AM

Balancing Bi Planes
 
I have a GP Super Skybolt Bi Plane; the CG is measured from the underside of the upper wing; the manual states 4 5/8 Inches from the leading edge at the Fuselage sides; since the upper wing is not attached to the fuselage and the width of from there; would this be correct?

jester_s1 08-19-2015 05:03 AM

It just means to measure the CG location at the middle of the wing, not at the tips since the Skybolt upper wing is swept back a bit. If you were to measure it at the middle or at the tips you would wind up tail heavy.

jester_s1 08-19-2015 05:09 AM

It just means to measure the CG location at the middle of the wing, not at the tips since the Skybolt upper wing is swept back a bit. If you were to measure it at the middle or at the tips you would wind up tail heavy.

dasintex 08-19-2015 10:07 AM

I re-read my post and I left out some info; the way I understand it, the CG is 4 5/8" from the leading edge measured at the fuselage; since the upper wing is not attached to the fuselage; the width of the fuselage at a point where the upper wing is mounted is 6", so as I understand it, I would measure 3" on both sides of the center of the upper wing and the CG would be measured from that point on the wing, would this be correct

RBACONS 08-19-2015 03:54 PM

According to the manual, that is the way to do it although it is a bit strange. The kit version tells you to measure back at particular rib position outboard of the center rib so at least the ARF and kit seem to be consistent.

jester_s1 08-19-2015 07:19 PM

Yes, you should be fine doing it that way. FWIW,when in doubt about a CG position, it's smart to Google a CG calculator and figure it up yourself. That way you'll be able to set it from whatever point you want to and know you have it right.

DGrant 08-24-2015 03:11 PM

http://www.rcuniverse.com/forum/kit-...clubhouse.html

Here's a long standing thread on the SkyBolts... There's alot of experience and info in there on the plane. Good luck. :)

pkoury 08-24-2015 04:01 PM


Originally Posted by jester_s1 (Post 12086625)
It just means to measure the CG location at the middle of the wing, not at the tips since the Skybolt upper wing is swept back a bit. If you were to measure it at the middle or at the tips you would wind up tail heavy.

Confusing, first you say to measure at the middle then you say measuring at the middle or the tips will wind up tail heavy.

jester_s1 08-25-2015 07:37 PM

Reading it again, I can see how that's confusing. What I meant in that last sentence was the middle of each wing side instead of the middle of the whole wing which is near the fuselage.

dasintex 08-26-2015 07:39 AM

I flew the plane, balancing must be correct, it flew without any issues; I balanced it per post #4.

Appreciate the replys!


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