<div>That is great news, Chad. I'm glad to hear that the issues got resolved.</div>
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<div>I'm also very close on my setup... my stab is at 0 and the wings are almost +.5. The plane comes standard without downthrust and I have since added some to help with the pull to the canopy in the upline - its almost 100% but not quite. I think I may still be a little tail heavy and will add some nose weight when I get a day that is calm - it has been a little breezy here. Overall my plane is flying much better now as well.<br>
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<div class="gmail_quote">On Thu, Apr 10, 2008 at 8:56 AM, Chad Northeast <<a href="mailto:chadnortheast@shaw.ca">chadnortheast@shaw.ca</a>> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Guys<br><br>A while back I posted this, and have recently got around to the suggestions. Both Bryan and Nat said that the TL was far too much negative as the Twister has -2.5 deg molded into the fuse. So away I went, here is a copy of the email (just below) I sent to them after my flights to resolve it.<br>
<br>Before last week you could have never convinced me that you could get a plane neutral in knife edge without giving up something....well I officially stand corrected :-) They know their stuff, were right on the money and the Twister goes pretty much anywhere you point it now without mixing (except a bit on downline but I think I can get rid of that).<br>
<br>I gotta say thanks to Bryan and Nat for their help, they were bang on, and I would suggest to anyone that you give their suggestions and honest try, I bet you are more than happy with the results!<br><br>Chad<br><br>Hey guys,<br>
<br>Well finally got out flying, good thing too since I am off to NY state<br>again on Monday :-(<br><br>So, here is where I was, I broke down and bought an inclinometer so I<br>could actually measure the plane directly....since I am too lazy to do<br>
trig.<br><br>Engine, as molded is -2.5 but I was at -3.5, wing +0.8, stab +0.1.<br><br>So I got as much of the down out of it as possible which leaves me at -1,<br>I can't do any more without shimming the motor further out for more<br>
clearance spinner to nose ring. I put the wing back to +0.5 and left the<br>stab alone.<br><br>First flight today, removed the left rudder KE mix I had (had none on<br>right rudder), and downline mix.<br>- Plane needed a bit of down trim for level, but was pretty close<br>
- Uplines went to the canopy<br>- 45 ups inverted pulled over the top fairly hard<br>- 45 downs upright were pretty decent but still dove a bit - recall this<br>was my major beef with previous setup<br>- knife was pulling to canopy both ways<br>
<br>Second flight - moved CG back as I have felt that it was too far forward<br>in general, and I think you would agree if you saw where it was.<br>- more down trim<br>- Uplines became very close<br>- knife both ways was pretty good, really solid with right rudder, and<br>
very very close on left (slight belly pitch)...probably not worth mixing<br>out<br>- 45 downs upright were getting better<br>- downline mix reduced 2% from start<br>- 45 ups inverted better<br><br>Third flight - took out 1/2 turn of incidence, which by trig should put me<br>
at 0.41+ on the wings<br>- uplines became perfect, or really close...would need more flights in<br>various conditions to nail<br>- everything else was really close<br><br>Fourth flight - decided to adjust stab since I was carrying a little up<br>
elevator, so I took 1/2 turn out of adjuster which should being it close<br>to 0<br>- this pretty much sealed it<br>- uplines are as before, very very close<br>- no KE mix - even in the KE loop at high deflections its really, really<br>
good<br>- took another 1% out of my downline mix (I am at 2%, started at 5%)<br>- 45 ups inverted are really good, just a slight arc over the top<br>- 45 down upright is finally straight.<br><br>I need to spend some more time on it to really get a good feel, but I<br>
think the downthrust was causing a lot of problems to this plane. I have<br>never had it in all aspects of flight this close yet. I am anxious to get<br>more time on it and see if the changes really stick. Unfortunately on<br>
Sunday this plane is going to a buddy but I plan on incorporating all<br>these changes on the new Twister which is why I wanted to get it figured<br>out now :)<br><br>Any further comments? CG is probably around 33% of MAC, but to be exact I<br>
would have to calculate.<br><br>Upline snaps are as you say Bryan, on axis with no need to lead....I was<br>pretty happy to see that result :)<br><br>Chad<br><br><br>> > > From: "Chad Northeast" <<a href="mailto:chadnortheast@shaw.ca">chadnortheast@shaw.ca</a>><br>
> > > To: "NSRCA Mailing List" <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br>> > > Sent: Monday, March 10, 2008 4:57 PM<br>> > > Subject: Re: [NSRCA-discussion] the joy of trim<br>
> > ><br>> > ><br>> > > > Ok you trim masters, here is a tricky one for you.<br>> > > ><br>> > > > Bryan and I have been through this a bit last year but I<br>> ran out of<br>
> > time<br>> > > > before the Worlds to fix it and just flew with what I had.<br>> > > ><br>> > > > On my Twister I have this pesky problem, the setup is like so,<br>> > > ><br>
> > > > wing = 1/2+ Bryans suggestion and I like it<br>> > > > stab = 0<br>> > > > motor = factory claims 2.5 down, have not measured but<br>> could if asked,<br>> > I<br>> > > > have added more to cure a problem see below<br>
> > > > CG = has been anywhere from 275 to 300mm from TE mostly<br>> with the same<br>> > > > result. Currently its around 285-290 and it feels<br>> good at that point.<br>> > 45<br>> > > > ups inverted track almost hands off if under enough power.<br>
> > > ><br>> > > > Symptoms,<br>> > > ><br>> > > > Plane flies well, at this setup I need 0 mix right rudder<br>> to ele in<br>> > knife,<br>> > > > and about 2% up ele with left rudder in knife,<br>
> > > > about 1/32" down elevator with idle to fix a downline<br>> > > > Added downthrust as the increase in wing inc. and more<br>> forward CG<br>> > really<br>> > > > helped the mix in knife and made rollers easier, but<br>
> forced an<br>> > increase in<br>> > > > downthrust as the plane started pulling to the canopy on<br>> uplines.> > > Downline mix remained the same.<br>> > > ><br>> > > > The big problem I cannot resolve is this, a 45 deg down<br>
> upright (motor<br>> > at<br>> > > > idle) the plane pitches to the belly and will not track on<br>> its own for<br>> > any<br>> > > > length of time. If I switch the idle-down mix off<br>
> its rock solid on<br>> > that<br>> > > > line.<br>> > > ><br>> > > > I am open to all suggestions now that I have a bit of time<br>> to play<br>> > with<br>> > > > this, I hope Bryan chimes in some more as I would like to<br>
> continue> where<br>> > > > we left off last fall. If you suggest something I<br>> will do my best to<br>> > give<br>> > > > it a go and let you know how it works (provided it doesn't<br>
> snow!)> > ><br>> > > > The plane is basically super locked in with this setup,<br>> except for the<br>> > > > silly 45 down upright, which is a problem in cubans and such.<br>> > > ><br>
> > > > Comments and thoughts from the masters are most<br>> appreciated :) I<br>> > consider<br>> > > > myself one of the, cant really trim that well but can fly<br>> through it<br>> > just<br>
> > > > fine types :)<br>> > > ><br>> > > > Chad<br>> > > ><br>> > > > _______________________________________________<br>> > > > NSRCA-discussion mailing list<br>
> > > > <a href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br>> > > > <a href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion" target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><br>
> > ><br>_______________________________________________<br>NSRCA-discussion mailing list<br><a href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br><a href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion" target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><br>
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