[NSRCA-discussion] Trimming question

[Anthony Abdullah]

I am sure that this is and oversimplified approach to the problem, but being a regular subscriber to Occam's Razor quarterly demands that I ask. For my own information, could the funky pitch problem have anything to do with the oddly shaped rudder that designers of the Stik family of planes are so fond of using?

Rcmaster199 at aol.com wrote:        The simplest, quickest fix is to turn the wing up side down so the beastie has anhedral. Change nothing else initially.
   
  MattK
   
  In a message dated 1/30/2006 1:54:57 PM Eastern Standard Time, d.pappas at kodeos.com writes:
    Hi Gang, Hi Ken,
  The enswer probably lies in a combo of what Lance and Ron offered.
  How much is your buddy willingg to cut or add to fix the problem.
  A ventral strake/subfin will be a great experiment, and I am sure that a bunch of us would like to hear the results.
  Raising the stab would be terribly invasive, and also interesting.
  Make sure the ship flies with a styraight elevator first.
  later,
  Dean
   
   
  Dean Pappas 
Sr. Design Engineer 
Kodeos Communications 
111 Corporate Blvd. 
South Plainfield, N.J. 07080 
(908) 222-7817 phone 
(908) 222-2392 fax 
d.pappas at kodeos.com 
    -----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of patterndude at comcast.net
Sent: Monday, January 30, 2006 1:44 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Trimming question


  Ken,
  Not always. In level flight the neg incidence will require up trim. In KE flight, the tail has an increased weighting in the balance of forces and this uptrim can be more than needed.
  --Lance
   
   
  --
District 6 AVP 
www.aeroslave.com
   
  -------------- Original message -------------- 
From: "Ken Thompson" <mrandmrst at comcast.net> 

> Wouldn't negative incidence cause it to push to the gear, not the canopy? 
> 
> Ken 
> ----- Original Message ----- 
> From: "Lance Van Nostrand" 

> To: "NSRCA Mailing List" 
> Sent: Monday, January 30, 2006 12:40 AM 
> Subject: Re: [NSRCA-discussion] Trimming question 
> 
> 
> > Not many responses to this one, but here's my thought. The wing incidence 
> > is way negative and the CG is aft. I got myself into that situation once 
> > and didn't catch it for a while. Inverted flight was fine but the plane 
> > was 
> > squirrely and the up elv trim was more effective in knife edge than level 
> > flight, resultin! g in canopy pull. 
> > --Lance 
> > 
> > ----- Original Message ----- 
> > From: "John Pavlick" 
> > To: "NSRCA Discussion" 
> > Sent: Friday, January 27, 2006 10:31 PM 
> > Subject: [NSRCA-discussion] Trimming question 
> > 
> > 
> >> Ok here's a good one. The owner of the L.H.S. asked me what I thought 
> >> about 
> >> this and I couldn't come up with a good answer. He has a Hangar 9 Ugly 
> >> Stik - the real big one. I can't remember exactly what it's called. Guess 
> >> it 
> >> has a gas motor in it. It's big. He says he has it trimmed so it will fly 
> >> inverted with just a very slight bit of down elevator (almost none). Ok, 
> >> so 
> >> it's not nose heavy, maybe even a little tail heavy. Now, when he flies 
> >&! gt; it 
> >> knife edge (either side) it pulls severely to the canopy. I mean like it 
> >> will fly a complete circle. It needs almost 3/4 down elevator to fly 
> >> straight. It's beyond a mix - fix. He also says that it has a bit of roll 
> >> couple when flying level (not knife edge) but it doesn't pitch severely 
> >> up 
> >> or down under these conditions. Any thoughts? I guess you can rule out 
> >> C.G. 
> >> because if anything it should pull to the belly considering how it's 
> >> trimmed 
> >> to fly level upright and inverted. I haven't flown it so I can't add too 
> >> much more. He builds OK so I don't think there's anything way out of 
> >> alignment, but again I haven't seen it yet so maybe there is. What should 
> >> I 
> >> look for if I get my hands on it to try and help him? 
  
   
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