Sounds like I need to move to Snomoish WA and join EAA chapter 84. James certainly answered my questions. Does anyone have details on what the tabs would look like? I suppose one on the elevator (I already have a little electric trim tab) and one on an aileron. I have always wanted an autopilot but have been unwilling to pay the price.
On Fri, May 15, 2020, 10:23 James McGauhey via KRnet <krnet@list.krnet.org> wrote: > I think the trim tab concept is to simplify installation. If your control > cables work fine and are adjusted properly, then one train of thinking is > to not mess with those. Adding small trim tabs is a simple thing to do > without messing with your controls. That said, most autopilots do work by > installing along the control cables. One system uses a bar often used at a > horn, another sister ribs another cable to the control cable and the new > one goes around the servo with a capstan. Either is designed so you can > override by manual control and they don't mess up your original control > cables. If something happens, like the loop comes off the capstan, the > original controls still work fine. I was going to build a KR, but changed > to a Zenith CH-650 with full Dynon system and we have two servos for > autopilot. One of each kind. The bar or rod type and the capstan type on > elevator. They've worked great for 2 years now. The autopilot controls > are built into each Dynon screen, just add servos and calibrate. Dynon > servos are about $750 each, total $1,500, which I think is a lot for > servos, but the total is cheap for a full autopilot system. Other brand > servos can be used. > > As for balancing a prop, I'm wondering maybe you balanced by weight, but > is there a chance the twist is a bit different for each blade? There is a > dynamic prop balancer, and I know some in KR land have them as it was used > at the Oregon gathering a few years ago. Our EAA Chapter 84 in WA has one > in the tool crib. They cost $1,200 to $1,500 (for the cheap ones, shop > type are $4k+). Having a shop do it is often about $400 to $500. Our > chapter charges $20 but it is only available to members and then only with > supervision by a member with experience. Belonging to a EAA Chapter with a > good tool crib is very valuable, even after your build is complete. We > also have very high quality aircraft scales in our chapter, as well as > swaging tools, a vinyl cutter, a 3D printer, and more. We want to add a > cable tensiometer as this is often a one time use when setting control > cables in a build. All these items are typically used only a few times > during a build and generally not worth buying as an individual. > Jim McGauhey > Prez, EAA Chapter 84 > Snohomish, WA > > -----Original Message----- > From: Gary Sack <garys...@gmail.com> > Sent: Thursday, May 14, 2020 11:52 PM > To: KRnet <krnet@list.krnet.org> > Subject: KR> Two questions > > I've enjoyed the comments concerning the autopilot. My question is: could > the servos drive springs attached to the control cables. This has been done > in aircraft for pitch trim and works pretty well. Seems simpler and more > aerodynamic than trim tabs that work opposite of the desired result. Either > way, I am interested. > Second question...a year ago I wrote about damaging my KR prop while > hand starting. I have repaired the prop and statically balanced it, but it > vibrates badly. Is there a simple way to dynamically balance a prop? Also > does it matter how the prop is orientated to the throw of the crankshaft? I > know the engine is fine because my spare prop runs smoothly. > > I took Richard's advice to mount a Subaru starter on my HAPI engine. I > had some problems getting the adapter plate just right, but my engine > really cranks now. Thanks. > > > > _______________________________________________ > 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
