Throt/ Rud

[Dean Pappas]

Hello Cameron,
In the experience of a great many of us, you should quit putting right thrust in at 3 degrees, because any more makes the plane fly stupidly (as you described) and add right rudder trim for the remainder. Generally this isn't a bad compromise. Other times, it leaves the previously mentioned warts. I would be willing to bet that with a carefully tailored throttle into rudder coupling, you would still be best off with a degree or two of right thrust, to compensate for the effect of spiral airflow striking the chin and vertical tail (if it is above the plane's center line) at cruise power and speed. The right thrust will not hurt spin entries, and the like.
 
I'll have to go experiment with this, myself. Oh yeah ... there's a ton of snow out there!
 
Regards,
            Dean Pappas
	-----Original Message----- 
	From: discussion-request at nsrca.org on behalf of Cameron Smith 
	Sent: Wed 1/26/2005 6:19 PM 
	To: discussion at nsrca.org 
	Cc: 
	Subject: RE: Throt/ Rud
	
	
	Chip has his own forum on RCU.I am not sure how attended it is. I’m sure he would answer questions there eventually.
	 
	 I DO relate to his comments of : ,” they do not have that funny yaw through the corners”  I am running 5 degrees of engine thrust & on corner radius leading to inverted flight I am noticing how I have to chase/lead  the exits with left rudder. I think this is what he is addressing. 
	 
	 I have reduced the amount of right thrust till it’s noticed on the upline and then chase it there. “Really Sucks!” I put it back to 4.something.
	 
	 I hope to remove ALL engine thrust & try his mix when the wind lays down & it gets above 65.
	 
	 There was a time I was scared to program mix Yaw to Pitch. I now have it in ALL planes. Even use slight down with Throttle for even nicer down lines.(When CG work has been exhausted.) 
	 
	 
	 I wonder IF Don S or Troy N. could comment on this.
	 
	 
	-----Original Message-----
	From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On Behalf Of Nat Penton
	Sent: Wednesday, January 26, 2005 1:33 PM
	To: discussion at nsrca.org
	Subject: Throt/ Rud
	 
	Cameron Smith relayed comments from Chip ( from RCU ) relating to how he uses a mix to eliminate the need for right thrust. I know Chip knows but he left me confused. Could someone clarify what he said?
	 
	   
	I run almost no right thrust in my planes and use the thottle to rudd mix at 2% left rudd. to throttle at idle. Thottle is the master rudd the slave. This makes the planes fly so much better when inverted at idle, they do not have that funny yaw through the corners. I have all but stopped using right thrust and do it all with the mix. What happens is the fin moves to the opposite side when inverted but the engine and prop don't know it, so the plane starts to yaw really bad due to spiraling slip stream. 
	
	To set this up just go out and fly the plane straight away from yourself at full throttle and then go to idle and watch to see which way it yaws start with 2% and start it from half throttle on down. 
	
	Trim it a full throttle with you rudder trim, and when you go to an idle if the plane yaws left you have to much mix, yaws right there's not enough. Have this screen up at take off and a buddy that can adjust it for you. Once you have it going nice and straight at idle and full go out and do a stall turn at the end of the box, on your way down do a half roll and exit inverted, you will be amazed how well it will go through that corner. 
	
	Do that first before any other trimming. After that go with CG(45 degree upline 1/2 roll and it should stay on that line with little or no down elev.) then ail differential(1 Degree More up the Down) verticals(wing incidence .5-1 degree positive, then put the stab where ever it needs to go get the elevators to be neutral, you will at this time mix 1-2% down elevator with throttle for your down lines), and knife edge last (start with 5% up elevator with rudd.) 
	
	Let me know how it goes and remember trim smarter not harder<G> 
	
	Chip
	 
	 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/ms-tnef
Size: 9270 bytes
Desc: not available
Url : http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20050127/aa6afae6/attachment.bin