TWITCHY...!!!

[Bootlegger]

  Hello and Greetin's from South Louisians,
   Fellows yesterday I flew my Nobler for the first time. Have a Fox 35 w/ceramic liner in it, but the plane wanted to "hunt" in level flight.
 The balance point is where the directions called for and with the Fox engine and stock muffler I had to add an ounce of lead to get the c/g right.
  Plans said 2 1/2" back of leading edge at fuse. Line length is 59' eye to eye, had nice line tension, and when it ran out of fuel it settled in rather well. (Not huntin) as bad as with power. So my thoughts were it isn't tail heavy.
  Any suggestions???
 

[RC Storick]

Check flap and elevator alignment. If close put a little down elevator in it. To get a true handle on it I would have to watch it fly. But I bet its flying tail down.

[FLOYD CARTER]

Probably not an ARF.  They tend to use heavy wood (surely not balsa) in the tail feathers.  Normally they would be tail heavy except for installation of a big, honkin' motor.

FC

[Alan Hahn]

Floyd,

I have two Arf Noblers from the first batch. One with a Brodak 40 and tongue muffler weighs just under 40 oz (unfueled). The other I converted to electric. It weighs in at just under 44oz (fully charged battery included!).

The TF Arf Nobler is really a light weight plane. No heavy wood there!

[Bootlegger]

  Guy's I have a confession to make ...It is an arf with the coverin' removed, I got it on the other web in the classified's..
  Hope that no one "shoots the messinger"...
    Thanks again...

[Will Hinton]

I've had a couple of stunters that hunted in level flight and a .010 shim under the front engine bolts cured them.  Chris R. clued me in on that cure.
Blessings,
Will

[Bootlegger]

 Have put .010 shims under the front of the engine, hope that this cures the problem.
  Will get a chance to check later this week I hope.
  Thanks for all the suggestions guy's. Will Hinton I had read that some where and forgot..
 "My memory isn't failing, my FORGETTOR is working REAL well"...

[Bootlegger]

        Yesterday afternoon I went out to fly the Nobler that wanted to "hunt", well Mr Hinton reminded me of a long forgotten trick and I tried it and walla, it don't hunt any more...
 I added .010 shims under the front of the engine lugs and no more huntin' !!!  Thanks for your reminder Will Hinton, I owe ya' one cup of coffee...

[kdheath]

I'm sure glad I'm not the only one around with this twitchiness problem....

[Balsa Butcher]

I was going to suggest sealing the hinge lines. 

[Howard Rush]

I'm sure glad it was just the Nobler.  I was afraid maybe your left eye was jumping.

[Bob Reeves]

      Yesterday afternoon I went out to fly the Nobler that wanted to "hunt", well Mr Hinton reminded me of a long forgotten trick and I tried it and walla, it don't hunt any more...
 I added .010 shims under the front of the engine lugs and no more huntin' !!!  Thanks for your reminder Will Hinton, I owe ya' one cup of coffee...

Confused, this is adding up thrust (assuming the engine was 0 to start with) and I've always heard that if anything you should crank in a little Down Thrust.. This is a thread on Stuka Stunt that discusses it..

 http://www.clstunt.com/htdocs/dc/dcboard.php?az=show_topic&forum=103&topic_id=284770

Have seen many of the top 10 say the same thing but this was the only one I could find with a quick search. I would think adding in up thrust would create more trim issues than it cures.

[Bootlegger]

  Don't know if I mentioned the fact that due to soft mounts I had cut the motor mount out and installed R/C mount with engine inverted, then per Will Hinton's suggestion put .010 shim under the front motor bolts for down thrust.  It werk'd !!!  Not a BAD Port eye...
  Flew it Sunday afternoon and all is well with it.
   Thanks for the help Men...

[Bob Reeves]

Well DUH... Of course the engine is inverted you dummy.. Now it makes sense