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General control line discussion => Open Forum => Topic started by: Tim Stagg on December 14, 2010, 08:36:01 AM

Title: Trimming question on Tip Weight
Post by: Tim Stagg on December 14, 2010, 08:36:01 AM

Guys,

Have a question regarding tip weight and a quirk the airplane has while doing a tight inside corner.

The airplane flies level right side up and upside down but during a tight inside loop/corner the outboard wing tends to rock forward a little. Could this be caused by to little tip weight or is this a vertical CG issue or something else all together.

Thanks for any input.

Title: Re: Trimming question on Tip Weight
Post by: Bill Little on December 14, 2010, 09:03:55 AM

HI Tim,

If i read correctly what you're saying, that the tip rocks forward, then I would say the weight is not enough.  Too much weight generally cause the tip to "drop" towards the rear when doing insides.  That's what I understand as hinging.

How are the wing tips during upright and inverted flight?

Title: Re: Trimming question on Tip Weight
Post by: Tim Stagg on December 14, 2010, 09:23:09 AM

Bill the weight looks correct there, they are level both ways. My thinking is the same as yours, I just wanted some additional input.

Thanks

Title: Re: Trimming question on Tip Weight
Post by: Bill Little on December 14, 2010, 09:41:30 AM

Quote from: Tim Stagg on December 14, 2010, 09:23:09 AM

Bill the weight looks correct there, they are level both ways. My thinking is the same as yours, I just wanted some additional input.

Thanks

Hi Tim,

What I always hear from the Experts is to put in tip weight until the wing hinges (or the outboard tip drops both ways) and then start taking small amounts back out.  Those seems the simplest ways.

Title: Re: Trimming question on Tip Weight
Post by: Jim Thomerson on December 14, 2010, 11:14:43 AM

You might try moving your leadouts just a hair forward.

Title: Re: Trimming question on Tip Weight
Post by: Dick Pacini on December 14, 2010, 11:17:22 AM

My thoughts are that the plane is in a constant state of yaw due to too much line sweep, rudder or engine offset.  During the hard corner, the airspeed drops a little and the yaw relaxes a bit, allowing the outboard tip to swing toward the front.

Title: Re: Trimming question on Tip Weight
Post by: Brett Buck on December 14, 2010, 11:53:59 AM

Quote from: Tim Stagg on December 14, 2010, 08:36:01 AM

Guys,

Have a question regarding tip weight and a quirk the airplane has while doing a tight inside corner.

The airplane flies level right side up and upside down but during a tight inside loop/corner the outboard wing tends to rock forward a little. Could this be caused by to little tip weight or is this a vertical CG issue or something else all together.

   Assuming by "rocking forward" you mean that the airplane yaws nose-in, sounds to me that either you have the leadouts too far forward, and/or some rudder offset. When you fix it you might need to change the tipweight but I would be very surprised if the root cause is a tipweight issue.

       Brett

Title: Re: Trimming question on Tip Weight
Post by: Tim Stagg on December 14, 2010, 02:27:38 PM

Thanks all for the comments,

This time of year is tough cause I want to try a fix and see what happens, the weather is so bad the only thing I can do is think and ponder as to what is wrong. I have several things to try now.

If I could just get some decent weather, I need to move somewhere warm   HB~>

Thanks Again