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Old 04-06-2021, 01:07 AM
mattlydon is offline
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Still can’t fly straight
United States, NY, Tappan
Joined Sep 2006
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Pilot 33yak cg....is this insane?

I picked up a used pilot 33% yak (97”, designed around a da85) - measured the cg the other night, and it looks like it’s about an inch and small change BEHIND wing tube....

There’s no listing for this particular plane in pilots list of cg’s, so I have no idea of where the “factory” cg is supposed to be, most pilot planes I’ve had typically have cg right around the front of the tube. This puts it at about 9.5 back on a 24” root seems pretty far back to me.

The PO a presumably flew it like this, as I havn’t changed anything other than adding some baffling and replacing the lipos, but I’d hate to take it up and find it uncontrollable.......

Anyone know the plane, and/or is this a ‘reasonable’ cg for this ship?

TIA,

Matt
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Old 04-06-2021, 01:18 AM
The Hodge is offline
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Guided by JR Propo
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Victoria, Austrailia
Joined Mar 2008
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This sounds like the Early Pilot / SD Model Designed one.

Does seam a bit back, To Be safe id Balance on the tube, Generally the Wing tube is in the 30% MAC range and this is a good C of G Range and you can go from there.

30% mac is around the 7.2 inch mark on that root calculation.
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Last edited by The Hodge; 04-06-2021 at 01:29 AM.
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Old 04-06-2021, 07:40 AM
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AHP
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Charlotte, NC
Joined Jan 2006
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I have the 35% / 107" Pilot Yak and the (conservative, IMO) CG marking is at the trailing edge of the wingtube. You're probably fine.
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