Trimming Question

[Larry Diamond]

Dean,
 
Thanks for the advise...I think I'm on the right track. As for the
"spectacular horse power"...The Aresti has a real good power to weight
ratio with this set up. Plane is under 5-1/2lbs. If I pull power, the
nose will start to slowly drop at the top of the 1/2 reverse cuban 8 as
the airspeed decreases.
 
I got through the up/down thrust test on the trim chart and ran out of
time. Seems ok through this part of trimming. I did note that I may need
a little more right thrust as it requires right rudder after pulling to
vertical about 200ft. Didn't notice a pitching tendency. I'll check it
again and pay closer attention......
 
I'm new at this, so I appreciate the responses...
 
Thanks, 

Larry K. Diamond 
Program Manager, KEG 

Phone:  (812) 634-4286 
Pager:   (877) 575-4163 
Fax:      (812) 634-4007 
E-Mail:  ldiamon at kimball.com 

	-----Original Message-----
	From: Dean Pappas [mailto:d.pappas at kodeos.com] 
	Sent: Thursday, May 01, 2003 1:46 PM
	To: discussion at nsrca.org
	Subject: RE: Trimming Question
	
	
	Hello Larry,
	You should not be trying to trim out the pitch behavior with
rudder in level flight, but in the knife edge and/or vertical down.
Tail-heaviness makes planes pull to the belly both there and in level
flight with rudder. You just might be tail-heavy, based on your
statement that you have to make the looping portion of the 1/2 reverse
cuban start. You are probably in the very smal adjstments needed
neighborhood. Unless your horsepower is spectacular (it should with the
combo you have) a normal plane will want to start to at least think of
dropping its nose after the 1/2 roll on the 45 up.
	 
	Check both knife edges and the up and down lines. If three out
of four (it's not a vote) pull to the belly, then you are tail-heavy.
	Regards,
	    Dean Pappas

		-----Original Message-----
		From: Larry Diamond [mailto:ldiamon at kimball.com]
		Sent: Thursday, May 01, 2003 10:13 AM
		To: NSRCA
		Subject: Trimming Question
		
		

		I am sorting out an H9 Aresti 40 that I intend to start
with Sportsman until I get another plane sorted out. 

		CG appears to be very close. It holds a 45 degree upline
straight and needs a touch of elevator to start the pull through the 1/2
Reverse Cuban 8. Inverted flight only requires a touch of down elevator.

		My tank location was modified from the intended location
and is on CG, to be read, "The front of the fuel tank is about 1/4 inch
forward of the leading edge. I have mounted a YS 63 and has unlimited
vertical after 4 tanks of fuel. CG is currently located at 4" back from
the LE per the instructions (aft range). This tank location result in
outstanding ground handling on grass. Zero tendency to nose over, not
even close...

		The problem is in level flight it pitches to the belly
with rudder input. Made for an interesting landing when I corrected with
a touch of rudder for cross wind. 

		Is this an incidence problem? I haven't tried a power
off dive yet to check it out due to time. What else could I look for?

		Engine - YS 63 New (2 tanks for break in and 4 flights) 
		Prop - APC 11x8 
		Max RPM - 11,400 (slightly rich still) 

		Thanks, 

		Larry K. Diamond 
		Program Manager, KEG 

		Phone:  (812) 634-4286 
		Pager:   (877) 575-4163 
		Fax:      (812) 634-4007 
		E-Mail:  ldiamon at kimball.com 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20030501/13c67fad/attachment.html