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Hobbyzone Freedom Firebird CG question

Old 04-22-2011, 01:17 AM
  #1  
earthsciteach
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Default Hobbyzone Freedom Firebird CG question

Hey, guys. I have a student with a HZ Firebird. He never had any luck flying it. He brought it into school today and I was checking it over. The CG seems WAY far back-beyond 3/4 of chord length from leading edge.

Does anyone know the published CG location for this plane?
Thanks!
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Old 04-25-2011, 10:06 PM
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Slowjohn
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Your right, that does seem way too far back. Try 25% ~ 30% back from the leading edge of the wing at the fuselage.
Good Luck!

Standing By,
SJ
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Old 04-25-2011, 10:46 PM
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Felklaw
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Ahh, the FBF for new students trap....

She definately is tail heavy (I have 4 Chucky Cheese coins (or you could use 4 quarters) in the nose in front of the foam).
This coupled with the absolutely brutal stall characteristics of her makes her a real b*tch of a learner's plane.

First thing is add weight to the nose. The 4 quarters seems almost perfect.
Second thing is always ROG. Never EVER try hand toss unless you are on top of a hill and throwing her slightly downhill. She needs a good rate of knots to generate proper lift, and without it, she will perform a nasty tip stall, wing over and hit the deck.
Thirdly, if possible, add some stall strips to the LE to help rectify the tip stall behaviour.

Below is a link to a thread I ran when I first started having the experiences with my FBF. After the repair, coins and stall strips, she actually flies pretty well as long as you maintain airspeed. I fly at a local baseball field carpark, so nice open area and get some good long approaches with throttle. I even accidentally flew her inverted and realised almost too late she didn't have airelons to roll out!

I also fly a Mini Super Cub, so have been practicing with her so I am better with the FBF. I won't quit on her until she is a burning wreck, but sometimes I have wanted to grab a can of kero and douse her!
Again, definately not a docile or suitable trainer airframe.

http://www.wattflyer.com/forums/showthread.php?t=49842

and

http://www.wattflyer.com/forums/showthread.php?t=49644
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Old 04-29-2011, 04:23 AM
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AEAJR
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There are LOTS of threads and posts about the Firebird Freedom. Most of them were tail heavy. I used to put 1 or 2 quarters in the nose to get them to fly properly.

One of the worst beginner planes ever.
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