I used the T3-12A model in all three planes as well as the aileron trim in the RV. My reasoning follows: The slower you go, the less effective your trim becomes. So, for your trim to be effective enough to have a shot at landing the plane with trim only (A requirement I set for mine), you need to have a longer throw to get as much nose up trim as possible for slow speed. Mine would not have been easy to land with trim only if the elevator control rod had fallen off, but it certainly would have been survivable and likely could have done so without damaging the plane. I never actually followed through on a landing with trim only, but did test it down the approach to prove it could do so.
-Jeff Scott Arkansas Ozarks. > Sent: Wednesday, November 18, 2020 at 1:12 PM > From: "Samuel Spanovich via KRnet" <krnet@list.krnet.org> > To: "krnet@list.krnet.org" <krnet@list.krnet.org> > Cc: "Samuel Spanovich" <spanovich...@gmail.com> > Subject: Re: KR> Elevator Trim Adjustment > > Wow, thank you very much for the quick replies; > > While I have not looked at the problem or system in detail (will get to it > Friday or Saturday work permitting), I can say from the few times I have > looked at it, the trim tab is connected to a cable (nothing special, just a > normal every day cable you would find in something like a go-kart throttle > system). From there, the cable is tightened/loosened by a small handle that > can be rotated clockwise or counterclockwise. Tightening the cable will pull > the trim tab down, giving you nose up trim, while loosening the cable > releases this pressure, which allows the trim tab to move upwards, giving you > essentially nose down trim. > > I never thought much about it at first (other than that it was very > simplified), however after hearing your guy’s replies and doing some reading > these past couple days, I am actually surprised that for two years now, both > A&P’s performing my conditional inspection made no mention of this very > simplistic design and signed the plane off as airworthy. > > Mostly in part to your guy’s advice, and also from reading too many good > reviews about the product, I am going to order one of the Ray Allen Trim > Systems and fix the problem once and for all. > > My next two questions (for Larry and Jeff), what model of the Ray Allen Servo > did you get? I noticed there are three models: the T2-7A, T2-10A, and the > T3-12A, which have 17mm, 26mm, and 31mm of travel respectively. Larry, I > noticed you used the T2-10A model, and it has obviously worked out for you. > Jeff Scott, which model did you choose? Ray Allen recommends the T2-10A for > the KR-2; just wanted to see if you used anything different. > > Secondly; judging by the pictures, it appears you guys mounted the trim tab > in the elevator section by screwing 4x screws into the wood section in the > elevator. As far as actually mounting the unit goes, is that about all there > is to it, or is there more to the installation than that? Before I go > cutting into the elevator, I want to make sure I have a solid plan of what to > expect. > > Again, thank you everyone for all the help; Once I receive the Ray Allen > System, and get to installing it, I will post back here with results. > > V/R > > Sam Spanovich > N6399U > 74S, Anacortes WA > _______________________________________________ > Search the KRnet Archives at > https://www.mail-archive.com/krnet@list.krnet.org/. > Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options. > To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org > _______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/krnet@list.krnet.org/. Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options. To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org
