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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Hawk pitches up in forward flight
04-27-2004 06:09 AM  13 years agoPost 1
Ninjak2k

rrApprentice

Centreville, VA

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My Hawk seems to have a very bad tendency to pitch up in forward flight and I'm not sure how to correct it. If I'm moving at a good clip and let off the forward cyclic, the Heli will almost pull itself vertical if I don't stop it. The faster I'm moving, the worse it is.

I'm flying with wood blades from a crash kit, stock paddles, Futaba 9202s on all controls except rudder. I'm using a TJ Pro and set it for a head speed of ~1700.

All thoughts appreciated.

Thanks,
Dan

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04-27-2004 06:32 AM  13 years agoPost 2
Skypig

rrNovice

Citrus Heights, CA

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Had the same thing happen on my Hawk. Changed the blades and the problem went away. Guess that some woodies are just limp weenies.


Taking off and flying are easy, It's the landings that will kill you.

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04-27-2004 06:36 AM  13 years agoPost 3
Gearhead

rrMaster

Vt

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make sure your paddles are level at 0 degrees of pitch,,, yes, blade can make a diff~~~~~~ wood sucks !!

Jim

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04-27-2004 07:01 AM  13 years agoPost 4
kauaison

rrApprentice

Alameda, CA

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could also be tail heavy...buddies hawk was tail heavy, balanced it with large Nicads

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04-27-2004 12:54 PM  13 years agoPost 5
SteveH

rrProfessor

Texas

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Same Subject

Same subject covered here:

http://runryder.com/helicopter/t103109p1/

The government cannot give you anything without first taking it from someone else.

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04-27-2004 02:01 PM  13 years agoPost 6
Ninjak2k

rrApprentice

Centreville, VA

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Thanks for the replies. I've got the paddles as close to even as I can see. Thinking of getting some type of paddle gauge to be sure. The bird used to be pretty tail heavy, bit I got the servo tray extension to move the battery as forward as it can go and used a 4-cell 2700 mAh NiMH pack. I think it's still a bit tail heavy when fully fueled.

Thanks for the link, Steve. I tried searching on pitchy, pitch-up, etc., but missed pitching.

~Dan

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05-11-2004 03:11 PM  13 years agoPost 7
Ninjak2k

rrApprentice

Centreville, VA

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Well, even with some new Funkey silver blades, I still have a tendency to pitch up in forward flight, though not as badly. I've also added weight to the front of the canopy, in addition to the extended battery tray and larger battery, and I'm pretty close to the right CG. Maybe just a tad tail heavy when fully loaded with fuel.

That being the case and needing forward trim to maintain a hover, I would think I would have a pitch down tendency in forward flight, but that's not the case at all. I also was using a pair of breedatrad's recycled V-blade paddles, which I hoped would help as they get such great reviews here, but it didn't seem to do much for me. I've switched to a pair of Century's "Hot Dog" paddles, though I've read those can make a bird even more pitchy. I figured it couldn't hurt anything.

I was thinking of adding a hint of negative pitch to my paddles at neutral. Do you think this would help anything or just put an uneeded load on my control system?

Thanks,
Dan

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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Hawk pitches up in forward flight
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